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Bastian Oesterle

Former member

Prof. Dr.-Ing.

Vita

since 04/2022: Full professor and Head of the Institute for Structural Analysis, Hamburg University of Technology
02/2019–03/2019: Visiting Scholar at IMDEA Materials Institute and the Technical University of Madrid, Spain, Prof. Ignacio Romero
05/2018–03/2022: Postdoc and group leader of the research field Shells, FEM and IGA at the Institute for Structural Mechanics, University of Stuttgart, Prof. Dr.-Ing. habil. M. Bischoff
04/2018: Ph.D. (Dr.-Ing.): "Intrinsisch lockingfreie Schalenformulierungen" within the Graduate Academy of the University of Stuttgart (GRADUS)
11/2011–04/2018: Scientific staff at the Institute for Structural Mechanics, University of Stuttgart, Prof. Dr.-Ing. habil. M. Bischoff
10/2010–03/2011: Student assistant at the Institute of Applied Mechanics (Civil Engineering), Chair I, University of Stuttgart, Prof. Dr.-Ing. C. Miehe
09/2009–04/2010: Two terms of Civil Engineering, University of Calgary, Canada
11/2007–07/2009: Student assistant at the Institute of Applied Mechanics (Civil Engineering), Chair I, University of Stuttgart, Prof. Dr.-Ing. C. Miehe
10/2006–09/2011: Student of Civil Engineering, University of Stuttgart
09/2005–06/2006: Civil Service
06/2005: Abitur at the Königin-Charlotte-Gymnasium, Stuttgart
1986: Born in Stuttgart

Prizes

02/2021–02/2023: Postdoctoral scholarship of the Daimler and Benz Foundation
07/2019: PhD thesis prize of the Friends of the University of Stuttgart for outstanding scientific achievements
01/2018: Publication prize of the University of Stuttgart 2017
07/2012: Artur-Fischer-Prize of the Faculty of Civil- and Environmental Engineering, University of Stuttgart
10/2008–09/2011: Tuition fee grant for the best 5% civil engineering students of the University of Stuttgart

Research

Isogeometric finite elements for shells
Finite element technology
Theory, modeling and analysis of thin-walled structures
Non-linear computational structural mechanics

Publications

Articles in journals

Thierer, R., Oesterle, B., Ramm, E., & Bischoff, M. (2024). Transverse shear parametrization in hierarchic large rotation shell formulations. International Journal for Numerical Methods in Engineering, 125(9), Article 9. https://doi.org/10.1002/nme.7443
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Abstract
Consistent treatment of large rotations in common Reissner–Mindlin formula-tions is a complicated task. Reissner–Mindlin formulations that use a hierarchicparametrization provide an elegant way to facilitate large rotation shell anal-yses. This can be achieved by the assumption of linearized transverse shearstrains, resulting in an additive split of strain components, which technicallysimplifies implementation of corresponding shell finite elements. The presentstudy aims at validating this assumption by systematically comparing numeri-cal solutions with those of a newly implemented hierarchic and fully nonlinearReissner–Mindlin shell element.
BibTeX
@article{thierer2024transverse, abstract = {Consistent treatment of large rotations in common Reissner–Mindlin formula-tions is a complicated task. Reissner–Mindlin formulations that use a hierarchicparametrization provide an elegant way to facilitate large rotation shell anal-yses. This can be achieved by the assumption of linearized transverse shearstrains, resulting in an additive split of strain components, which technicallysimplifies implementation of corresponding shell finite elements. The presentstudy aims at validating this assumption by systematically comparing numeri-cal solutions with those of a newly implemented hierarchic and fully nonlinearReissner–Mindlin shell element.}, author = {Thierer, Rebecca and Oesterle, Bastian and Ramm, Ekkehard and Bischoff, Manfred}, doi = {10.1002/nme.7443}, journal = {International Journal for Numerical Methods in Engineering}, number = 9, title = {Transverse shear parametrization in hierarchic large rotation shell formulations}, volume = 125, year = 2024 }
Oesterle, B., Geiger, F., Forster, D., Fröhlich, M., & Bischoff, M. (2022). A study on the approximation power of NURBS and the significance of exact geometry in isogeometric pre-buckling analyses of shells. Computer Methods in Applied Mechanics and Engineering, 397(115144), Article 115144. https://doi.org/10.1016/j.cma.2022.115144
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Abstract
We present a comprehensive study on the approximation power of NURBS and the significance of exact geometry in stability analyses of shells. Pre-buckling analyses are carried out to estimate the critical load levels and the initial buckling patterns. Various finite element solutions obtained with the commercial code ANSYS are compared with solutions from the isogeometric version of the finite element method, using our in-house code NumPro. In some problem setups, the isogeometric shell elements provide superior accuracy compared to standard (as opposed to isogeometric) shell finite elements, requiring only a fractional amount of degrees of freedom for the same level of accuracy. The present study systematically investigates the sources of this superior accuracy of the isogeometric approach. In particular, hypotheses are tested concerning the influence of exact geometry and smoothness of splines.
BibTeX
@article{oesterle2022study, abstract = {We present a comprehensive study on the approximation power of NURBS and the significance of exact geometry in stability analyses of shells. Pre-buckling analyses are carried out to estimate the critical load levels and the initial buckling patterns. Various finite element solutions obtained with the commercial code ANSYS are compared with solutions from the isogeometric version of the finite element method, using our in-house code NumPro. In some problem setups, the isogeometric shell elements provide superior accuracy compared to standard (as opposed to isogeometric) shell finite elements, requiring only a fractional amount of degrees of freedom for the same level of accuracy. The present study systematically investigates the sources of this superior accuracy of the isogeometric approach. In particular, hypotheses are tested concerning the influence of exact geometry and smoothness of splines.}, author = {Oesterle, Bastian and Geiger, Florian and Forster, David and Fröhlich, Manuel and Bischoff, Manfred}, doi = {10.1016/j.cma.2022.115144}, journal = {Computer Methods in Applied Mechanics and Engineering}, number = 115144, title = {A study on the approximation power of NURBS and the significance of exact geometry in isogeometric pre-buckling analyses of shells}, volume = 397, year = 2022 }
Pfefferkorn, R., Bieber, S., Oesterle, B., Bischoff, M., & Betsch, P. (2020). Improving Efficiency and Robustness of EAS Elements for Nonlinear Problems. International Journal for Numerical Methods in Engineering, 122(8), 1911–1939. https://doi.org/10.1002/nme.6605
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Abstract
The enhanced assumed strain (EAS) method is one of the most frequently used methods to avoid locking in solid and structural finite elements. One issue of EAS elements in the context of geometrically non‐linear analyses is their lack of robustness in the Newton‐Raphson scheme, which is characterized by the necessity of small load increments and large numbers of iterations. In the present work we extend the recently proposed mixed integration point (MIP) method to EAS elements in order to overcome this drawback in numerous applications. Furthermore, the MIP method is generalized to generic material models, which makes this simple method easily applicable for a broad class of problems. In the numerical simulations in this work, we compare standard strain based EAS elements and their MIP improved versions to elements based on the assumed stress method in order to explain when and why the MIP method allows to improve robustness. A further novelty in the present work is an inverse stress‐strain relation for a Neo‐Hookean material model.
BibTeX
@article{pfefferkorn2020improving, abstract = {The enhanced assumed strain (EAS) method is one of the most frequently used methods to avoid locking in solid and structural finite elements. One issue of EAS elements in the context of geometrically non‐linear analyses is their lack of robustness in the Newton‐Raphson scheme, which is characterized by the necessity of small load increments and large numbers of iterations. In the present work we extend the recently proposed mixed integration point (MIP) method to EAS elements in order to overcome this drawback in numerous applications. Furthermore, the MIP method is generalized to generic material models, which makes this simple method easily applicable for a broad class of problems. In the numerical simulations in this work, we compare standard strain based EAS elements and their MIP improved versions to elements based on the assumed stress method in order to explain when and why the MIP method allows to improve robustness. A further novelty in the present work is an inverse stress‐strain relation for a Neo‐Hookean material model.}, author = {Pfefferkorn, Robin and Bieber, Simon and Oesterle, Bastian and Bischoff, Manfred and Betsch, Peter}, doi = {10.1002/nme.6605}, journal = {International Journal for Numerical Methods in Engineering}, number = 8, pages = {1911-1939}, title = {Improving Efficiency and Robustness of EAS Elements for Nonlinear Problems}, volume = 122, year = 2020 }
Portillo, D., Oesterle, B., Thierer, R., Bischoff, M., & Romero, I. (2020). Structural models based on 3D constitutive laws: Variational structure and numerical solution. Computer Methods in Applied Mechanics and Engineering, 362. https://doi.org/10.1016/j.cma.2020.112872
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Abstract
In all structural models, the section or fiber response is a relation between the strain measures and the stress resultants. This relation can only be expressed in a simple analytical form when the material response is linear elastic. For other, more complex and interesting situations, kinematic and kinetic hypotheses need to be invoked, and a constrained three-dimensional constitutive relation has to be employed at every point of the section in order to implement non-linear and dissipative constitutive laws into dimensionally reduced structural models. In this article we explain in which sense reduced constitutive models can be expressed as minimization problems, helping to formulate the global equilibrium as a single optimization problem. Casting the problem this way has implications from the mathematical and numerical points of view, naturally defining error indicators. General purpose solution algorithms for constrained material response, with and without optimization character, are discussed and provided in an open-source library.
BibTeX
@article{portillo2020structural, abstract = {In all structural models, the section or fiber response is a relation between the strain measures and the stress resultants. This relation can only be expressed in a simple analytical form when the material response is linear elastic. For other, more complex and interesting situations, kinematic and kinetic hypotheses need to be invoked, and a constrained three-dimensional constitutive relation has to be employed at every point of the section in order to implement non-linear and dissipative constitutive laws into dimensionally reduced structural models. In this article we explain in which sense reduced constitutive models can be expressed as minimization problems, helping to formulate the global equilibrium as a single optimization problem. Casting the problem this way has implications from the mathematical and numerical points of view, naturally defining error indicators. General purpose solution algorithms for constrained material response, with and without optimization character, are discussed and provided in an open-source library.}, author = {Portillo, David and Oesterle, Bastian and Thierer, Rebecca and Bischoff, Manfred and Romero, Ignacio}, doi = {10.1016/j.cma.2020.112872}, journal = {Computer Methods in Applied Mechanics and Engineering}, title = {Structural models based on 3D constitutive laws: Variational structure and numerical solution}, volume = { 362}, year = 2020 }
Zou, Z., Scott, Michael. A., Miao, D., Bischoff, M., Oesterle, B., & Dornisch, W. (2020). An isogeometric Reissner–Mindlin shell element based on Bézier dual basis functions: Overcoming locking and improved coarse mesh accuracy. Computer Methods in Applied Mechanics and Engineering, 370. https://doi.org/10.1016/j.cma.2020.113283
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Abstract
We develop a mixed geometrically nonlinear isogeometric Reissner–Mindlin shell element for the analysis of thin-walled structures that leverages Bézier dual basis functions to address both shear and membrane locking and to improve the quality of computed stresses. The accuracy of computed solutions over coarse meshes, that have highly non-interpolatory control meshes, is achieved through the application of a continuous rotational approach. The starting point of the formulation is the modified Hellinger–Reissner variational principle with independent displacement, membrane, and shear strains as the unknown fields. To overcome locking, the strain variables are interpolated with lower-order spline bases while the variations of the strain variables are interpolated with the corresponding Bézier dual bases. Leveraging the orthogonality property of the Bézier dual basis, the strain variables are condensed out of the system with only a slight increase in the bandwidth of the resulting linear system. The condensed approach preserves the accuracy of the non-condensed mixed approach but with fewer degrees of freedom. From a practical point of view, since the Bézier dual basis is completely specified through Bézier extraction, any spline space that admits Bézier extraction can utilize the proposed approach directly.
BibTeX
@article{zou2020isogeometric, abstract = {We develop a mixed geometrically nonlinear isogeometric Reissner–Mindlin shell element for the analysis of thin-walled structures that leverages Bézier dual basis functions to address both shear and membrane locking and to improve the quality of computed stresses. The accuracy of computed solutions over coarse meshes, that have highly non-interpolatory control meshes, is achieved through the application of a continuous rotational approach. The starting point of the formulation is the modified Hellinger–Reissner variational principle with independent displacement, membrane, and shear strains as the unknown fields. To overcome locking, the strain variables are interpolated with lower-order spline bases while the variations of the strain variables are interpolated with the corresponding Bézier dual bases. Leveraging the orthogonality property of the Bézier dual basis, the strain variables are condensed out of the system with only a slight increase in the bandwidth of the resulting linear system. The condensed approach preserves the accuracy of the non-condensed mixed approach but with fewer degrees of freedom. From a practical point of view, since the Bézier dual basis is completely specified through Bézier extraction, any spline space that admits Bézier extraction can utilize the proposed approach directly.}, author = {Zou, Zhihui and Scott, Michael. A. and Miao, D. and Bischoff, Manfred and Oesterle, Bastian and Dornisch, Wolfgang}, doi = {10.1016/j.cma.2020.113283}, journal = {Computer Methods in Applied Mechanics and Engineering}, title = {An isogeometric Reissner–Mindlin shell element based on Bézier dual basis functions: Overcoming locking and improved coarse mesh accuracy}, volume = { 370}, year = 2020 }
Bieber, S., Oesterle, B., Ramm, E., & Bischoff, M. (2018). A variational method to avoid locking – independent of the discretization scheme. International Journal for Numerical Methods in Engineering, 114, 801–827. https://doi.org/10.1002/nme.5766
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Abstract
We present a variational method for problems in solid and structural mechanics that is designed to be intrinsically free from locking when using equal order interpolation for all involved fields. The specific feature of the formulation is that it avoids all geometrical locking effects (as opposed to material locking effects, e.g. Poisson locking) for any type of structural or solid model, independent of the underlying discretization scheme. The possibility to employ equal order interpolation for all involved fields circumvents the task of finding particular function spaces to remove locking and avoid artificial stress oscillations. This is particularly attractive for instance for isogeometric analysis using unstructured meshes or T-splines. Comprehensive numerical tests underline the promising behaviour of the proposed method for geometrically linear and non-linear problems in terms of displacements and stress resultants using standard finite elements, isogeometric finite elements and a meshless method.
BibTeX
@article{bieber2018variational, abstract = {We present a variational method for problems in solid and structural mechanics that is designed to be intrinsically free from locking when using equal order interpolation for all involved fields. The specific feature of the formulation is that it avoids all geometrical locking effects (as opposed to material locking effects, e.g. Poisson locking) for any type of structural or solid model, independent of the underlying discretization scheme. The possibility to employ equal order interpolation for all involved fields circumvents the task of finding particular function spaces to remove locking and avoid artificial stress oscillations. This is particularly attractive for instance for isogeometric analysis using unstructured meshes or T-splines. Comprehensive numerical tests underline the promising behaviour of the proposed method for geometrically linear and non-linear problems in terms of displacements and stress resultants using standard finite elements, isogeometric finite elements and a meshless method.}, author = {Bieber, Simon and Oesterle, Bastian and Ramm, Ekkehard and Bischoff, Manfred}, doi = {10.1002/nme.5766}, journal = {International Journal for Numerical Methods in Engineering}, pages = {801-827}, title = {A variational method to avoid locking – independent of the discretization scheme}, volume = { 114}, year = 2018 }
Oesterle, B., Sachse, R., Ramm, E., & Bischoff, M. (2017). Hierarchic isogeometric large rotation shell elements including linearized transverse shear parametrization. Computer Methods in Applied Mechanics and Engineering, 321, 383–405. https://doi.org/10.1016/j.cma.2017.03.031
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Abstract
Two novel hierarchic finite element formulations for geometrically nonlinear shell analysis including the effects of transverse shear are presented. Both methods combine a fully nonlinear Kirchhoff-Love shell model with hierarchically added linearized transverse shear components. Thus, large rotations can be taken into account while circumventing the peculiar task of finding a corresponding parametrization of the rotation tensor. The two formulations differ in the way the transverse shear effects are included, either using hierarchic rotations or hierarchic displacements. The underlying assertion is that in most practical applications the transverse shear angles are small even for large deformations. This is confirmed by various numerical experiments. The hierarchic construction results in an additive strain decomposition into parts resulting from membrane and bending deformation and additional contributions from transverse shear. It requires at least C1-continuous shape functions, which can be easily established within the isogeometric context using spline based finite elements. As reported earlier, this concept is intrinsically free from transverse shear locking. In the nonlinear case it dramatically facilitates representation of large rotations in shell analysis.
BibTeX
@article{oesterle2017hierarchic, abstract = {Two novel hierarchic finite element formulations for geometrically nonlinear shell analysis including the effects of transverse shear are presented. Both methods combine a fully nonlinear Kirchhoff-Love shell model with hierarchically added linearized transverse shear components. Thus, large rotations can be taken into account while circumventing the peculiar task of finding a corresponding parametrization of the rotation tensor. The two formulations differ in the way the transverse shear effects are included, either using hierarchic rotations or hierarchic displacements. The underlying assertion is that in most practical applications the transverse shear angles are small even for large deformations. This is confirmed by various numerical experiments. The hierarchic construction results in an additive strain decomposition into parts resulting from membrane and bending deformation and additional contributions from transverse shear. It requires at least C1-continuous shape functions, which can be easily established within the isogeometric context using spline based finite elements. As reported earlier, this concept is intrinsically free from transverse shear locking. In the nonlinear case it dramatically facilitates representation of large rotations in shell analysis.}, author = {Oesterle, Bastian and Sachse, Renate and Ramm, Ekkehard and Bischoff, Manfred}, doi = {10.1016/j.cma.2017.03.031}, journal = {Computer Methods in Applied Mechanics and Engineering}, pages = {383–405}, title = {Hierarchic isogeometric large rotation shell elements including linearized transverse shear parametrization}, volume = { 321}, year = 2017 }
Oesterle, B., Ramm, E., & Bischoff, M. (2016). A shear deformable, rotation-free isogeometric shell formulation. Computer Methods in Applied Mechanics and Engineering, 307, 235–255. https://doi.org/10.1016/j.cma.2016.04.015
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Abstract
A finite element formulation for a geometrically linear, shear deformable (Reissner–Mindlin type) shell theory is presented, which exclusively uses displacement degrees of freedom. The total displacement is subdivided into a part representing the membrane and bending deformation, enriched by two extra “shear displacements”, representing transverse shear deformation. This rotation-free approach is accomplished within the isogeometric concept, using C1-continuous, quadratic NURBS as shape functions. The particular displacement parametrization decouples transverse shear from bending and thus the formulation is free from transverse shear locking by construction, i.e. locking is avoided on the theory level, not by choice of a particular discretization. Compared to the hierarchic formulation proposed earlier within the group of the authors (Echter et al., 2013), the method presented herein avoids artificial oscillations of the transverse shear forces. Up to now, a similar, displacement based method to avoid membrane locking has not been found. Thus, in the present formulation the mixed method from Echter et al. (2013) is used to avoid membrane locking.
BibTeX
@article{oesterle2016shear, abstract = {A finite element formulation for a geometrically linear, shear deformable (Reissner–Mindlin type) shell theory is presented, which exclusively uses displacement degrees of freedom. The total displacement is subdivided into a part representing the membrane and bending deformation, enriched by two extra “shear displacements”, representing transverse shear deformation. This rotation-free approach is accomplished within the isogeometric concept, using C1-continuous, quadratic NURBS as shape functions. The particular displacement parametrization decouples transverse shear from bending and thus the formulation is free from transverse shear locking by construction, i.e. locking is avoided on the theory level, not by choice of a particular discretization. Compared to the hierarchic formulation proposed earlier within the group of the authors (Echter et al., 2013), the method presented herein avoids artificial oscillations of the transverse shear forces. Up to now, a similar, displacement based method to avoid membrane locking has not been found. Thus, in the present formulation the mixed method from Echter et al. (2013) is used to avoid membrane locking.}, author = {Oesterle, Bastian and Ramm, Ekkehard and Bischoff, Manfred}, doi = {10.1016/j.cma.2016.04.015}, journal = {Computer Methods in Applied Mechanics and Engineering}, pages = {235–255}, title = {A shear deformable, rotation-free isogeometric shell formulation}, volume = { 307}, year = 2016 }
Echter, R., Oesterle, B., & Bischoff, M. (2013). A hierarchic family of isogeometric shell finite elements. Computer Methods in Applied Mechanics and Engineering, 254, 170–180. https://doi.org/10.1016/j.cma.2012.10.018
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Abstract
A hierarchic family of isogeometric shell finite elements based on NURBS shape functions is presented. In contrast to classical shell finite element formulations, inter-element continuity of at least C1 enables a unique and continuous representation of the surface normal within one NURBS patch. This does not only facilitate formulation of Kirchhoff-Love type shell models, for which the standard Galerkin weak form has a variational index of 2, but it also offers significant advantages for shear deformable (Reissner-Mindlin type) shells and higher order shell models. For a 5-parameter shell formulation with Reissner-Mindlin kinematics a hierarchic difference vector which accounts for shear deformations is superimposed onto the rotated Kirchhoff-Love type director of the deformed configuration. This split into bending and shear deformations in the shell kinematics results in an element formulation which is free from transverse shear locking without the need to apply further remedies like reduced integration, assumed natural strains or mixed finite element formulations. The third member of the hierarchy is a 7-parameter model including thickness change and allowing for application of unmodified three-dimensional constitutive laws. The phenomenon of curvature thickness locking, coming along with this kinematic extension, again is automatically avoided by the hierarchic difference vector concept without any further treatment. Membrane locking and in-plane shear locking are removed by two different approaches: firstly elimination via the Discrete Strain Gap (DSG) method and secondly removal of parasitic membrane strains using a hybrid-mixed method based on the Hellinger-Reissner variational principle. The hierarchic kinematic structure of the three different shell formulations allows a straightforward combination of these elements within one mesh and is thus the ideal basis for a model adaptive approach.
BibTeX
@article{echter2013hierarchic, abstract = {A hierarchic family of isogeometric shell finite elements based on NURBS shape functions is presented. In contrast to classical shell finite element formulations, inter-element continuity of at least C1 enables a unique and continuous representation of the surface normal within one NURBS patch. This does not only facilitate formulation of Kirchhoff-Love type shell models, for which the standard Galerkin weak form has a variational index of 2, but it also offers significant advantages for shear deformable (Reissner-Mindlin type) shells and higher order shell models. For a 5-parameter shell formulation with Reissner-Mindlin kinematics a hierarchic difference vector which accounts for shear deformations is superimposed onto the rotated Kirchhoff-Love type director of the deformed configuration. This split into bending and shear deformations in the shell kinematics results in an element formulation which is free from transverse shear locking without the need to apply further remedies like reduced integration, assumed natural strains or mixed finite element formulations. The third member of the hierarchy is a 7-parameter model including thickness change and allowing for application of unmodified three-dimensional constitutive laws. The phenomenon of curvature thickness locking, coming along with this kinematic extension, again is automatically avoided by the hierarchic difference vector concept without any further treatment. Membrane locking and in-plane shear locking are removed by two different approaches: firstly elimination via the Discrete Strain Gap (DSG) method and secondly removal of parasitic membrane strains using a hybrid-mixed method based on the Hellinger-Reissner variational principle. The hierarchic kinematic structure of the three different shell formulations allows a straightforward combination of these elements within one mesh and is thus the ideal basis for a model adaptive approach.}, author = {Echter, R. and Oesterle, B. and Bischoff, M.}, doi = {10.1016/j.cma.2012.10.018}, journal = {Computer Methods in Applied Mechanics and Engineering}, pages = {170-180}, title = {A hierarchic family of isogeometric shell finite elements}, volume = { 254}, year = 2013 }

Articles in proceedings

Oesterle, B., Thierer, R., Krauß, L.-M., & Bischoff, M. (2024). Hierarchische Formulierungen für statische und dynamische Analysen von Flächentragwerken. In B. Oesterle, A. Bögle, W. Weber, & L. Striefler (Eds.), Berichte der Fachtagung Baustatik – Baupraxis 15, 04. und 05. März 2024, Hamburg (pp. 357--364). https://doi.org/10.15480/882.9247
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Abstract
Hierarchische Balken-, Platten- und Schalenformulierungen basieren auf einer geschickten Reparametrisierung der kinematischen Gleichungen, die sich für neuartige, glatte Diskretisierungsverfahren als vorteilhaft erweist. Im vorliegenden Beitrag werden die intrinsischen Eigenschaften des hierarchischen Konzepts anhand statischer und dynamischer Analysen von Flächentragwerken aufgezeigt und diskutiert.
BibTeX
@inproceedings{oesterle2024hierarchische, abstract = {Hierarchische Balken-, Platten- und Schalenformulierungen basieren auf einer geschickten Reparametrisierung der kinematischen Gleichungen, die sich für neuartige, glatte Diskretisierungsverfahren als vorteilhaft erweist. Im vorliegenden Beitrag werden die intrinsischen Eigenschaften des hierarchischen Konzepts anhand statischer und dynamischer Analysen von Flächentragwerken aufgezeigt und diskutiert.}, author = {Oesterle, Bastian and Thierer, Rebecca and Krauß, Lisa-Marie and Bischoff, Manfred}, booktitle = {Berichte der Fachtagung Baustatik – Baupraxis 15, 04. und 05. März 2024, Hamburg}, doi = {10.15480/882.9247}, editor = {Oesterle, Bastian and Bögle, Annette and Weber, Wolfgang and Striefler, Lukas}, pages = {357--364}, title = {Hierarchische Formulierungen für statische und dynamische Analysen von Flächentragwerken}, year = 2024 }
Oesterle, B., Bieber, S., Sachse, R., Ramm, E., & Bischoff, M. (2018). Intrinsically locking-free formulations for isogeometric beam, plate and shell analysis. Proc. Appl. Math. Mech., 18. https://doi.org/10.1002/pamm.201800399
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Abstract
In this contribution a class of formulations for beams, plates and shells is presented, which intrinsically avoids locking, independent of the utilized discretization scheme. The key idea is the reparametrization of the kinematic equations to avoid locking on theory level – prior to discretization. Thus, the resulting formulations are locking‐free for any equal‐order interpolation. As demonstrator, we present both mixed and primal concepts for Timoshenko beams in both weak and strong form, as well as their theoretical relationships. Besides a weak form Galerkin‐type solution using B‐Splines, we show the generality of the presented concepts by employing isogeometric collocation based on the corresponding Euler‐Lagrange equations of the boundary value problem. The quality of both stress resultants and displacements is investigated. Although the underlying concept addresses beams, plates and shells, the present contribution illustrates the methodology for the Timoshenko beam.
BibTeX
@inproceedings{oesterle2018intrinsically, abstract = {In this contribution a class of formulations for beams, plates and shells is presented, which intrinsically avoids locking, independent of the utilized discretization scheme. The key idea is the reparametrization of the kinematic equations to avoid locking on theory level – prior to discretization. Thus, the resulting formulations are locking‐free for any equal‐order interpolation. As demonstrator, we present both mixed and primal concepts for Timoshenko beams in both weak and strong form, as well as their theoretical relationships. Besides a weak form Galerkin‐type solution using B‐Splines, we show the generality of the presented concepts by employing isogeometric collocation based on the corresponding Euler‐Lagrange equations of the boundary value problem. The quality of both stress resultants and displacements is investigated. Although the underlying concept addresses beams, plates and shells, the present contribution illustrates the methodology for the Timoshenko beam.}, author = {Oesterle, Bastian and Bieber, Simon and Sachse, Renate and Ramm, Ekkehard and Bischoff, Manfred}, booktitle = {Proc. Appl. Math. Mech., 18}, doi = {10.1002/pamm.201800399}, title = {Intrinsically locking-free formulations for isogeometric beam, plate and shell analysis}, year = 2018 }
Oesterle, B., Sachse, R., Bieber, S., Ramm, E., & Bischoff, M. (2017). Isogeometric analysis with hierarchic shell elements – intrinsically free from locking by alternative parametrizations. Proceedings of the IASS Annual Symposium 2017. Annette Bögle, Manfred Grohmann (eds.) “Interfaces: architecture.engineering.science”. 25-28th September, 2017, Hamburg, Germany.
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Abstract
The higher inter-element continuity of the Isogeometric Analysis (IGA) applying NURBS functions for geometry as well as mechanics opens up new possibilities in the analysis of thin-walled structures, i.e. beams, plates and shells. An important advantage is the straightforward implementation of classical theories, which require C1-continuity, e. g. Kirchhoff-Love shell formulations. Based on these "simplest" models shear deformable theories, introducing Timoshenko and Reissner-Mindlin kinematics, are formulated in a hierarchic manner. In contrast to using total rotations the present formulations introduce incremental transverse shear rotations as primary variables. This reparametrization of the kinematic equations can be established in several different fashions, which is addressed in this contribution. All parametrizations have in common, that they lead to shear deformable beam, plate and shell formulations being intrinsically free from transverse shear locking. This is a remarkable feature since the spectrum of different smooth discretization schemes in IGA and other fields of computational shell analysis is continuously growing and the proposed hierarchic shell formulations are locking-free, independent of the underlying discretization.
BibTeX
@inproceedings{oesterle2017isogeometric, abstract = {The higher inter-element continuity of the Isogeometric Analysis (IGA) applying NURBS functions for geometry as well as mechanics opens up new possibilities in the analysis of thin-walled structures, i.e. beams, plates and shells. An important advantage is the straightforward implementation of classical theories, which require C1-continuity, e. g. Kirchhoff-Love shell formulations. Based on these "simplest" models shear deformable theories, introducing Timoshenko and Reissner-Mindlin kinematics, are formulated in a hierarchic manner. In contrast to using total rotations the present formulations introduce incremental transverse shear rotations as primary variables. This reparametrization of the kinematic equations can be established in several different fashions, which is addressed in this contribution. All parametrizations have in common, that they lead to shear deformable beam, plate and shell formulations being intrinsically free from transverse shear locking. This is a remarkable feature since the spectrum of different smooth discretization schemes in IGA and other fields of computational shell analysis is continuously growing and the proposed hierarchic shell formulations are locking-free, independent of the underlying discretization.}, author = {Oesterle, Bastian and Sachse, Renate and Bieber, Simon and Ramm, Ekkehard and Bischoff, Manfred}, booktitle = {Proceedings of the IASS Annual Symposium 2017. Annette Bögle, Manfred Grohmann (eds.) "Interfaces: architecture.engineering.science". 25-28th September, 2017, Hamburg, Germany}, title = {Isogeometric analysis with hierarchic shell elements – intrinsically free from locking by alternative parametrizations}, year = 2017 }
Oesterle, B., Bischoff, M., & Ramm, E. (2016). Hierarchic isogeometric analyses of beams and shells. M. Kleiber, T. Burczynski, K. Wilde, J. Gorski, K. Winkelmann, L. Smakosz (Eds.) Ädvances in Mechanics: Theoretical, Computational and Interdisciplinary Issues". Proceedings of the 3rd Polish Congress of Mechanics (PCM) & 21st International Conference on Computer Methods in Mechanics (CMM), Gdansk, Poland, 8-11 September 2015, 41–46.
- Abstract
- BibTeX
Abstract
The higher inter-element continuity of the Isogeometric Analysis (IGA) applying NURBS functions for geometry as well as mechanics opens up new possibilities in the analysis of thin-walled structures, i.e. beams, plates and shells. The contribution addresses the straightforward implementation of classical theories requiring C1-continuity, such as the Euler-Bernoulli beam and Kirchhoff-Love shell theory. Based on these “simplest” models shear deformable theories, introducing Timoshenko and Reissner-Mindlin kinematics, are formulated in a hierarchic manner. In contrast to the usual Finite Element concept using total rotations the present model picks up traditional formulations introducing incremental rotations as primary variables. Furthermore an alternative version is discussed with a split of the displacements into bending and transverse shear parts. Both hierarchic concepts can be easily extended to 3D–shell models. The key aspect of this alternative parameterization is the complete a-priori removal of the transverse shear locking and curvature thickness locking (in the case of 3D-shells).
BibTeX
@inproceedings{oesterle2016hierarchic, abstract = {The higher inter-element continuity of the Isogeometric Analysis (IGA) applying NURBS functions for geometry as well as mechanics opens up new possibilities in the analysis of thin-walled structures, i.e. beams, plates and shells. The contribution addresses the straightforward implementation of classical theories requiring C1-continuity, such as the Euler-Bernoulli beam and Kirchhoff-Love shell theory. Based on these “simplest” models shear deformable theories, introducing Timoshenko and Reissner-Mindlin kinematics, are formulated in a hierarchic manner. In contrast to the usual Finite Element concept using total rotations the present model picks up traditional formulations introducing incremental rotations as primary variables. Furthermore an alternative version is discussed with a split of the displacements into bending and transverse shear parts. Both hierarchic concepts can be easily extended to 3D–shell models. The key aspect of this alternative parameterization is the complete a-priori removal of the transverse shear locking and curvature thickness locking (in the case of 3D-shells).}, author = {Oesterle, Bastian and Bischoff, Manfred and Ramm, Ekkehard}, booktitle = {M. Kleiber, T. Burczynski, K. Wilde, J. Gorski, K. Winkelmann, L. Smakosz (Eds.) "Advances in Mechanics: Theoretical, Computational and Interdisciplinary Issues". Proceedings of the 3rd Polish Congress of Mechanics (PCM) & 21st International Conference on Computer Methods in Mechanics (CMM), Gdansk, Poland, 8-11 September 2015}, pages = {41-46}, title = {Hierarchic isogeometric analyses of beams and shells}, year = 2016 }

Collections as Editor

Bischoff, M., von Scheven, M., & Oesterle, B. (Eds.). (2020). Berichte der Fachtagung Baustatik – Baupraxis 14. 23. und 24. März 2020, Institut für Baustatik und Baudynamik, Universität Stuttgart. https://doi.org/10.18419/opus-10762
- BibTeX
BibTeX
@book{bischoff2020berichte, doi = {10.18419/opus-10762}, editor = {Bischoff, Manfred and {von Scheven}, Malte and Oesterle, Bastian}, publisher = {23. und 24. März 2020, Institut für Baustatik und Baudynamik, Universität Stuttgart}, title = {Berichte der Fachtagung Baustatik – Baupraxis 14}, year = 2020 }

Doctoral Thesis

Oesterle, B. (2018). Intrinsisch lockingfreie Schalenformulierungen. Doktorarbeit, Bericht Nr. 67, Institut für Baustatik und Baudynamik, Universität Stuttgart. https://doi.org/10.18419/opus-10046
- Abstract
- BibTeX
Abstract
Angesichts einer stetig steigenden Anzahl komplexer Diskretisierungsverfahren beschäftigt sich die vorliegende Arbeit mit intrinsisch lockingfreien Schalenformulierungen. Aus der Literatur bekannte Konzepte versuchen stets die durch die Diskretisierung entstehenden Locking-Effekte zu beseitigen oder abzumindern. Tritt Locking jedoch gar nicht auf, ist dessen Beseitigung obsolet. Deshalb sollen die hier vorgestellten Schalenformulierungen numerische Locking-Effekte bereits auf Theorieebene vermeiden, ungeachtet vom verwendeten Diskretisierungsschema. Die Vermeidung von Locking bereits vor der Diskretisierung verspricht ein breites Anwendungsspektrum für diverse Diskretisierungsverfahren im Bereich von Computersimulationen physikalischer Vorgänge. Der erste Teil dieser Arbeit beschäftigt sich mit der intrinsischen Vermeidung von Querschublocking in Formulierungen für Strukturtheorien. Über hierarchische Reparametrisierung der kinematischen Gleichungen kann Querschublocking im Rahmen einer primalen Methode a priori vermieden werden. Das Konzept wird gleichermaßen für schubweiche Balken-, Platten- und Schalenformulierungen demonstriert, wobei jeweils zwei hierarchische Parametrisierungen unterschieden werden. Der zweite theoretische Teil dieser Arbeit beschäftigt sich mit der intrinsischen Vermeidung aller geometrischen Locking-Effekte, vor allem aber von Membranlocking. Es wird ein neuartiges, reparametrisiertes gemischtes Prinzip vorgestellt, in dem ausschließlich Verschiebungsgrößen als Primärvariablen auftreten. Diese Reparametrisierung führt dazu, dass die für gemischte Methoden notwendige Wahl geeigneter Spannungs- oder Verzerrungsräume entfällt. Die daraus resultierende intrinsische Vermeidung geometrischer Locking-Effekte verspricht ein breites Anwendungsspektrum dieser Methode.
BibTeX
@phdthesis{oesterle2018intrinsisch, abstract = {Angesichts einer stetig steigenden Anzahl komplexer Diskretisierungsverfahren beschäftigt sich die vorliegende Arbeit mit intrinsisch lockingfreien Schalenformulierungen. Aus der Literatur bekannte Konzepte versuchen stets die durch die Diskretisierung entstehenden Locking-Effekte zu beseitigen oder abzumindern. Tritt Locking jedoch gar nicht auf, ist dessen Beseitigung obsolet. Deshalb sollen die hier vorgestellten Schalenformulierungen numerische Locking-Effekte bereits auf Theorieebene vermeiden, ungeachtet vom verwendeten Diskretisierungsschema. Die Vermeidung von Locking bereits vor der Diskretisierung verspricht ein breites Anwendungsspektrum für diverse Diskretisierungsverfahren im Bereich von Computersimulationen physikalischer Vorgänge. Der erste Teil dieser Arbeit beschäftigt sich mit der intrinsischen Vermeidung von Querschublocking in Formulierungen für Strukturtheorien. Über hierarchische Reparametrisierung der kinematischen Gleichungen kann Querschublocking im Rahmen einer primalen Methode a priori vermieden werden. Das Konzept wird gleichermaßen für schubweiche Balken-, Platten- und Schalenformulierungen demonstriert, wobei jeweils zwei hierarchische Parametrisierungen unterschieden werden. Der zweite theoretische Teil dieser Arbeit beschäftigt sich mit der intrinsischen Vermeidung aller geometrischen Locking-Effekte, vor allem aber von Membranlocking. Es wird ein neuartiges, reparametrisiertes gemischtes Prinzip vorgestellt, in dem ausschließlich Verschiebungsgrößen als Primärvariablen auftreten. Diese Reparametrisierung führt dazu, dass die für gemischte Methoden notwendige Wahl geeigneter Spannungs- oder Verzerrungsräume entfällt. Die daraus resultierende intrinsische Vermeidung geometrischer Locking-Effekte verspricht ein breites Anwendungsspektrum dieser Methode.}, author = {Oesterle, Bastian}, doi = {10.18419/opus-10046}, publisher = {Doktorarbeit, Bericht Nr. 67, Institut für Baustatik und Baudynamik, Universität Stuttgart}, title = {Intrinsisch lockingfreie Schalenformulierungen}, year = 2018 }

Diploma Thesis

Oesterle, B. (2011). Vermeidung geometrischer Locking-Effekte bei isogeometrischen finiten Elementen. Diplomarbeit 11/11. Betreuer: Ralph Echter. Institut für Baustatik und Baudynamik, Universität Stuttgart.
- Abstract
- BibTeX
Abstract
Die vorliegende Diplomarbeit beschäftigt sich mit der Vermeidung geometrischer Lockingeffekte bei isogeometrischen finiten Elementen. Der Fokus liegt auf der Erweiterung der DSG-Methode auf dreidimensionale NURBS finite Elemente und deren Anwendung auf die Berechnung von dünnwandigen, gekrümmten Kontinuums-Schalenstrukturen. Die modifizierten Elementformulierungen werden an geeigneten Testbeispielen auf Lockingeffekte und Konvergenzeigenschaften untersucht. Zudem werden Elementtests durchgeführt, die Aufschluss über die Netzverzerrungsempfindlichkeit von verschiebungsbasierten sowie DSG-modifizierten NURBS finiten Elementen geben sollen. Desweiteren sind Untersuchungen im Hinblick auf die hohe Kontinuität der verwendeten B-Spline-Funktionen Inhalt dieser Arbeit.
BibTeX
@mastersthesis{oesterle2011vermeidung, abstract = {Die vorliegende Diplomarbeit beschäftigt sich mit der Vermeidung geometrischer Lockingeffekte bei isogeometrischen finiten Elementen. Der Fokus liegt auf der Erweiterung der DSG-Methode auf dreidimensionale NURBS finite Elemente und deren Anwendung auf die Berechnung von dünnwandigen, gekrümmten Kontinuums-Schalenstrukturen. Die modifizierten Elementformulierungen werden an geeigneten Testbeispielen auf Lockingeffekte und Konvergenzeigenschaften untersucht. Zudem werden Elementtests durchgeführt, die Aufschluss über die Netzverzerrungsempfindlichkeit von verschiebungsbasierten sowie DSG-modifizierten NURBS finiten Elementen geben sollen. Desweiteren sind Untersuchungen im Hinblick auf die hohe Kontinuität der verwendeten B-Spline-Funktionen Inhalt dieser Arbeit.}, author = {Oesterle, Bastian}, publisher = {Diplomarbeit 11/11. Betreuer: Ralph Echter. Institut für Baustatik und Baudynamik, Universität Stuttgart}, title = {Vermeidung geometrischer Locking-Effekte bei isogeometrischen finiten Elementen}, year = 2011 }

Presentations

Presentations at Conferences

Bastian Oesterle, Jan Trippmacher, Anton Tkachuk, Manfred Bischoff. Intrinsically Selective Mass Scaling with Hierarchic Structural Element Formulations. 6th ECCOMAS Young Investigators Conference (YIC 2021), Valencia, Spain (Virtual Congress), July 7–9, 2021.

Bastian Oesterle, Florian Geiger, Manuel Fröhlich, David Forster, Manfred Bischoff. A study on the significance of exact geometry in stability analyses of shells and membranes. 14th World Congress in Computational Mechanics (WCCM XIV) and 8th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2020), Paris, France (Virtual Congress), January 11–15, 2021.

Bastian Oesterle, Florian Geiger, Manuel Fröhlich, Manfred Bischoff. On some results for buckling and wrinkling analysis of thin shells and membranes with isogeometric methods. 8th GACM Colloquium on Computational Mechanics (GACM 2019), Kassel, Germany, August 28–30, 2019.

Bastian Oesterle, Florian Geiger, Manuel Fröhlich, David Forster, Manfred Bischoff. On some results for buckling and wrinkling analysis of thin shells and membranes with isogeometric methods. Form and Force Joint International Conference: 60th IASS Symposium and 8th Structural Membranes, Barcelona, Spain, October 7–10, 2019.

Bastian Oesterle, Florian Geiger, Manuel Fröhlich, Manfred Bischoff. On some results for buckling and wrinkling analysis of thin shells and membranes with isogeometric methods. VII International Conference on Isogeometric Analysis (IGA 2019), Munich, Germany, September 18–20, 2019.

Bastian Oesterle, Simon Bieber, Renate Sachse, Ekkehard Ramm, Manfred Bischoff. Intrinsically locking-free formulations for isogeometric beam, plate and shell analysis. GAMM 2018, 89th Annual Meeting of the International Association of Applied Mathematics and Mechanics, Munich, Germany, March 19–23, 2018.

Bastian Oesterle, Simon Bieber, Ekkehard Ramm, Manfred Bischoff. A Variational Method to Avoid Locking - Independent of the Discretization. 14th US National Congress on Computational Mechanics (USNCCM 14), Montreal, Canada, July 17–20, 2017.

Bastian Oesterle, Renate Sachse, Ekkehard Ramm, Manfred Bischoff. Hierarchic Isogeometric Large Rotation Shell Elements Including Linearized Transverse Shear Parametrization. V International Conference on Isogeometric Analysis (IGA 2017), Pavia, Italy, September 11–13, 2017.

Bastian Oesterle, Ekkehard Ramm, Manfred Bischoff. Locking Free Isogeometric Structural Elements Preserving Sparsity of Stiffness Matrices. ECCOMAS Congress 2016, VII European Congress on Computational Methods in Applied Sciences and Engineering, Crete, Greece, June 5–10, 2016.

Bastian Oesterle, Ekkehard Ramm, Manfred Bischoff. A Shear-deformable, Rotation-free Isogeometric Shell Formulation. ECCOMAS Young Investigators Conference, GACM Colloquium on Computational Mechanics (YIC GACM 2015), Aachen, Germany, July 20–23, 2015.

Bastian Oesterle, Ekkehard Ramm, Manfred Bischoff. A Shear-deformable, Rotation-free Isogeometric Shell Formulation. 13th US National Congress on Computational Mechanics (USNCCM 13), San Diego, CA, USA, July 26–30, 2015.

Bastian Oesterle, Ralph Echter, Manfred Bischoff. Isogeometrische finite Elemente für Schalen. FE im Schnee 2014, Söllerhaus, Österreich, 26.–29. März 2014.

Bastian Oesterle, Ralph Echter, Ekkehard Ramm, Manfred Bischoff. Isogeometric analysis of beams and shells. HOFEIM 2014, Frauenchiemsee, Deutschland, 15.–18. Juli 2014.

Bastian Oesterle, Ralph Echter, Manfred Bischoff. Isogeometrische finite Elemente für Schalen. Forschungskolloquium Baustatik-Baupraxis 2012, Wesel/Niederrhein, 18.–21. September 2012.

Further Activities in the Scientific Community

Organization of Conferences and Mini Symposia

2021: Mini Symposium Isogeometric and Non-standard Discretization Schemes for Computational Structural and Solid Mechanics, 6^th ECCOMAS Young Investigators Conference (YIC 2021), July 7–9, 2021, Valencia, Spain (Mini Symposium Organizer)
2021: 6^th ECCOMAS Young Investigators Conference (YIC 2021), July 7–9, 2021, Valencia, Spain (Member of the Scientific Committee)
2020: ECCOMAS Young Investigators Science Slam, 14^th World Congress in Computational Mechanics (WCCM XIV) and 8^th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2020), July 19–24, 2020, Paris, France (Session Organizer)
2020: Mini Symposium Locking, Efficiency and Robustness of Finite Elements and Other Discretization Schemes, 14^th World Congress in Computational Mechanics (WCCM XIV) and 8^th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2020), July 19–24, 2020, Paris, France (Mini Symposium Organizer)
2020: Mini Symposium Advanced Modelling, Analysis and Design of Beam, Plate, Membrane and Shell Structures, 14^th World Congress in Computational Mechanics (WCCM XIV) and 8^th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2020), July 19–24, 2020, Paris, France (Mini Symposium Organizer)
2020: Thematic Session Flächentragwerke, 14. Fachtagung Baustatik-Baupraxis (BB14), 23.–24.03.2020, Stuttgart (Session Organizer)
2020: 14. Fachtagung Baustatik-Baupraxis (BB14), 23.–24.03.2020, Stuttgart, Germany (Secretary)
2019: Mini Symposium “Novel Theories, Formulations, Methods and Applications in Structural Mechanics”, 5^th ECCOMAS Young Investigators Conference (YIC 2019), September 1–6, 2019, Krakow, Poland (Mini Symposium Organizer)
2019: Mini Symposium “Novel Formulations and Discretization Methods for Thin-Walled Structures”, 8^th GACM Colloquium on Computational Mechanics for Young Scientists from Academia and Industry (GACM 2019), 28–30 August 2019, Kassel, Germany (Mini Symposium Organizer)
2019: Mini-Symposium “Non-standard Formulations and Discretizations for Thin-walled Structures”, 15^th U.S. National Congress on Computational Mechanics (USNCCM 15), July 28–August 1, 2019, Austin, Texas, USA (Mini Symposium Organizer)
2018: Mini Symposium “Isogeometric and Non-standard Formulations and Discretization Methods for Thin-Walled Structures” at the 13th World Congress in Computational Mechanics (WCCM 2018), 22–27 July 2018, New York, USA (Mini Symposium Organizer)
2017: Mini Symposium “Non-standard Formulations and Discretization Methods for Thin-Walled Structures” at the 7th GACM Colloquium on Computational Mechanics for Young Scientists from Academia and Industry (GACM 2017), 11–13 October 2017, Stuttgart, Germany (Mini Symposium Organizer)
2017: 7th GACM Colloquium on Computational Mechanics for Young Scientists from Academia and Industry (GACM 2017), 11–13 October 2017, Stuttgart, Germany (Local Organizing Team)
2017: Mini Symposium “Non-standard Formulations and Discretization Methods for Thin-Walled Structures” at the 14th U.S. National Congress on Computational Mechanics (USNCCM 14), July 17–20, 2017, Montreal, Canada (Mini Symposium Organizer)
2013: 3rd International Conference on Particle-based Methods (Particles 2013), 18–20 September 2013, Stuttgart, Germany (Local Organizing Team)

Review Activities

For funding agencies:

Deutsche Forschungsgemeinschaft (DFG)
Italian National Agency for the Evaluation of Universities and Research Institutes (ANVUR)

For scientific journals:

Advanced Modeling and Simulation in Engineering Sciences (AMOS)
Computers and Structures (CAS)
Computer Methods in Applied Mechanics and Engineering (CMAME)
Engineering Analysis with Boundary Elements (EABE)
International Journal for Numerical Methods in Engineering (IJNME)
Journal of Mechanical Engineering Science (JMES)
Journal of Theoretical, Computational and Applied Mechanics(JTCAM)
Meccanica (MECC)

External Profiles

Teaching

Technische Mechanik I, tutorial, winter terms 2008/2009 and 2010/2011
Technische Mechanik II, tutorial, summer term 2009
Baustatik I, exercise, summer term 2012
Baustatik II, exercise, winter term 2012/2013
Baustatik, exercise, summer term 2013 and winter term 2013/2014
Baustatik und Baudynamik II, exercise, winter term 2014/2015
Baustatik und Baudynamik I, lecture, summer terms 2018 and 2019
Computerorientierte Methoden für Kontinua und Flächentragwerke, lecture, winter terms 2018/2019, 2019/2020 and 2020/2021
Baustatik, lecture, summer term 2020 and winter term 2020/2021
Advanced Finite Element Technology, new lecture, summer term 2021

Supervision of Theses

Master Theses

Lisa-Marie Krauß. Intrinsisch selektive Massenskalierung mit hierarchischen Plattenformulierungen (22/02). Master Thesis. Supervisor: Rebecca Thierer und Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2022.
- Abstract
- Poster with results
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Nicolai Grünvogel. Selektive Massenskalierung für explizite dynamische Analysen dünnwandiger Strukturen mit Kontinuumselementen (22/03). Master Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2022.
- Abstract
- Poster with results
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Melanie Hofmann. Dynamische Simulation von Stabilitätsproblemen mit isogeometrischen Schalenelementen (20/13). Master Thesis. Supervisor: Bastian Oesterle und Rebecca Thierer. Institute for Structural Mechanics, University of Stuttgart. 2020.
- Abstract
- Poster with results
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Jan Trippmacher. Massenskalierung für hierarchische und gemischte Balkenformulierungen (20/16). Master Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2020.
- Abstract
- Poster with results
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Muxin Zhang. Methods for Cloth Simulations (19/01). Master Thesis. Supervisor: Alexander Müller und Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2019.
- Abstract
- Poster with results
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Özge Özbayram. Mixed Finite Elements for Geometrically Nonlinear Problems (19/02). Master Thesis. Supervisor: Bastian Oesterle und Simon Bieber. Institute for Structural Mechanics, University of Stuttgart. 2019.
- Abstract
- Poster with results
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Hannes Imhof. Geometrisch nichtlineare Effekte in der Tragwerksplanung (19/11). Master Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2019.
- Abstract
- Poster with results
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Wei Yao. Analytische, empirische und numerische Lösungen für das Beulproblem von Zylinderschalen unter Axialdruck (18/34). Master Thesis. Supervisor: Bastian Oesterle und Florian Geiger. Institute for Structural Mechanics, University of Stuttgart. 2018.
- Abstract
- Poster with results
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Yuan Song. Coupling of onedimensional elements with isogeometric shell elements (17/01). Master Thesis. Supervisor: Renate Sachse & Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2017.
- Abstract
- Poster with results
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Tobias Willmann. Experimentelle und numerische Festigkeitsuntersuchungen von hochfesten Schrauben unter Crashbelastung (17/18). Master Thesis. Supervisor: Bastian Oesterle (IBB) und Florian Schauwecker (Daimler AG). Institute for Structural Mechanics, University of Stuttgart. 2017.
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Rebecca Thierer. Entwicklung finiter Plattenelemente basierend auf Subdivision Surfaces (17/20). Master Thesis. Supervisor: Simon Bieber und Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2017.
- Abstract
- Poster with results
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Elian Sukkar. Recovery of stress resultants in geometrically linear and non-linear shell analysis (17/27). Master Thesis. Supervisor: Bastian Oesterle (IBB) und Roland Sauer (RIB). Institute for Structural Mechanics, University of Stuttgart. 2017.
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Manuel Fröhlich. A study on the significance of exact geometry in stability analyses of shells (17/33). Master Thesis. Supervisor: Bastian Oesterle und Florian Geiger. Institute for Structural Mechanics, University of Stuttgart. 2017.
- Abstract
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Simon Bieber. Development of locking-free isogeometric finite elements by means of the DSG method (16/06). Master Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2016.
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Ayse Usta. Hierarchic 3D shell elements for nonlinear isogeometric analysis (16/18). Master Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2016.
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Michaela Gehling. Nichtlineare Isogeometrische Schalenanalyse (15/12). Master Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2015.
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Nikhil Prashanth Prabakaran. Isogeometric Analysis of Shells in LS-DYNA (15/14). Master Thesis. Supervisor: Bastian Oesterle (IBB) und Stefan Hartmann (DYNAmore). Institute for Structural Mechanics, University of Stuttgart. 2015.
- Abstract
- Poster with results
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Andreas Ohse. Analyse gekrümmter Pflanzenflächen mit isogeometrischen Kontinuumsschalenelementen (15/25). Master Thesis. Supervisor: Renate Lehmann, Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2015.
- Abstract
- Poster with results
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Renate Lehmann. Isogeometrische Kontaktanalyse dünnwandiger Strukturen (14/13). Master Thesis. Supervisor: Martina Matzen und Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2014.
- Abstract
- Poster with results
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Pradeep Keshavanarayana. Spatial IsoGeometric Beam Elements (14/16). Master Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2014.
- Abstract
- Poster with results
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Bachelor Theses

Leonie Hahn. Speichenradkonstruktionen (20/01). Bachelor Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2020.
- Abstract
- Poster with results
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Mohie Adden Morad. Konvergenzeigenschaften isogeometrischer finiter Elemente (16/04). Bachelor Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2016.
- Abstract
- Poster with results
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Ranzi Huang. Computergestützter Entwurf von Schalentragwerken (16/25). Bachelor Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2016.
- Abstract
- Poster with results
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Tobias Willmann. Isogeometrische finite Elemente für ebene Balkenprobleme (15/01). Bachelor Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2015.
- Abstract
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Dessislava Panova. Isogeometrische Analyse von Schalenbauwerken (15/09). Bachelor Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2015.
- Poster with results
Andreas Ott. Formfindung und Stabilität von Steinbogenbrücken (15/18). Bachelor Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2015.
- Abstract
- Poster with results
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Philipp Schäfer. Formfindung von Schalenstrukturen mit numerischen Hängemodellen unter Anwendung der isogeometrischen Analyse (15/22). Bachelor Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2015.
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Cagatay Sener. Entwurf von Kinematik-Modellen (14/09). Bachelor Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2014.
- Abstract
- Poster with results
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Mengyuan Li. Computergestützte Berechnung und Darstellung von Gelenkfiguren (13/05). Bachelor Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2013.
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Simon Bieber. Isogeometrische finite Elemente für ebene Rahmen und Bogentragwerke (13/10). Bachelor Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2013.
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Marlene Grad. Brückentragwerke im Vergleich (13/21). Bachelor Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2013.
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Simon Kraft. Statische Berechnung einer Bambuskuppel (13/23). Bachelor Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2013.
- Abstract
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Michaela Gehling. Schwingungsauslegung von Brückenquerschnitten (12/08). Bachelor Thesis. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2012.
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Tabea Mauch. Statische Berechnung einer Schrägseilbrücke (12/12). Bachelor Thesis. Supervisor: Martina Matzen und Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2012.
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Further Theses

Tobias Willmann. Schraubenversagen im Automobilbau - Literaturrecherche und Versuchsvorbereitung (17/17). Research Module. Supervisor: Bastian Oesterle (IBB) und Florian Schauwecker (Daimler AG). Institute for Structural Mechanics, University of Stuttgart. 2017.
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Tobias Willmann. Dreidimensionale Schalenelemente mit erweitertem Verschiebungsgradienten (17/28). Research Module. Supervisor: Bastian Oesterle. Institute for Structural Mechanics, University of Stuttgart. 2017.
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Bastian Oesterle

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