Abstract
The performance of least-squares finite element formulations for geometrically linear and nonlinear problems is investigated in this work. We consider different elastic material behaviors as, e.g., quasi-incompressibility and transverse isotropy. Basis for the provided element formulations is a first-order system of differential equations consisting of the residual forms of the balance of momentum, a constitutive relation, and a (redundant) residual enforcing a stronger control of the balance of moment of momentum. The sum of the squared \(L^2(\mathcal{B})\)-norms of the residuals leads to a functional, which is the basis for the related minimization problem. As unknown fields the displacements (approximated in \(W^{1,p}(\mathcal{B})\)) and the stresses (approximated in \(W^{q}({\text {div}},\mathcal{B})\)) are chosen. Here, the choice of the polynomial orders of the interpolation functions for the displacements and stresses is not restricted by the so-called LBB condition; they can be chosen independently. Numerical examples for the proposed formulations are presented and compared to standard and mixed Galerkin formulations.
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- 1.
de Boer introduced the tensor cross product instead of the cofactor.
- 2.
Alternative invariance requirements in terms of first/second Piola–Kirchhoff stress tensors are \( {{\varvec{Q}}}{{\varvec{P}}}({{\varvec{F}}}) = {{\varvec{P}}}({{\varvec{F}}}^+) \forall {{\varvec{Q}}}\in \mathcal{{SO}}(3) \) and \( {{\varvec{S}}}({{\varvec{F}}}) = {{\varvec{S}}}({{\varvec{F}}}^+) \forall {{\varvec{Q}}}\in \mathcal{{SO}}(3) \), respectively.
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Acknowledgments
The authors would like to thank the German Research Foundation (DFG) for financial support: research grant SCHR 570/14-1. Furthermore, the authors are grateful to Gerhard Starke and Benjamin Müller with whom they have shared inspiring work on least-squares finite element methods. Special thanks go to Nils Viebahn for many hours of support especially for the implementation and visualization and to Maximilian Igelbüscher, Carina Nisters, and Serdar Serdas for fruitfull discussions.
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Schröder, J., Schwarz, A., Steeger, K. (2016). Least-Squares Mixed Finite Element Formulations for Isotropic and Anisotropic Elasticity at Small and Large Strains. In: Schröder, J., Wriggers, P. (eds) Advanced Finite Element Technologies. CISM International Centre for Mechanical Sciences, vol 566. Springer, Cham. https://doi.org/10.1007/978-3-319-31925-4_6
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