On the quasi-incompressible finite element analysis of anisotropic hyperelastic materials
Quasi-incompressible behavior is a desired feature in several constitutive models within the finite elasticity of solids, such as rubber-like materials and some fiber-reinforced soft biological tissues. The Q1P0 finite element formulation, derived from the three-field Hu–Washizu variational principl...
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Veröffentlicht in: | Computational mechanics 2019-03, Vol.63 (3), p.443-453 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Quasi-incompressible behavior is a desired feature in several constitutive models within the finite elasticity of solids, such as rubber-like materials and some fiber-reinforced soft biological tissues. The
Q1P0
finite element formulation, derived from the three-field Hu–Washizu variational principle, has hitherto been exploited along with the augmented Lagrangian method to enforce incompressibility. This formulation typically uses the unimodular deformation gradient. However, contributions by Sansour (Eur J Mech A Solids 27:28–39,
2007
) and Helfenstein et al. (Int J Solids Struct 47:2056–2061,
2010
) conspicuously demonstrate an alternative concept for analyzing fiber reinforced solids, namely the use of the (unsplit) deformation gradient for the anisotropic contribution, and these authors elaborate on their proposals with analytical evidence. The present study handles the alternative concept from a purely numerical point of view, and addresses systematic comparisons with respect to the classical treatment of the
Q1P0
element and its coalescence with the augmented Lagrangian method by means of representative numerical examples. The results corroborate the new concept, show its numerical efficiency and reveal a direct physical interpretation of the fiber stretches. |
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ISSN: | 0178-7675 1432-0924 |
DOI: | 10.1007/s00466-018-1602-9 |