Computational Mechanics

, Volume 19, Issue 1, pp 105–119 | Cite as

On some mixed finite element methods for incompressible and nearly incompressible finite elasticity

  • U. Brink
  • E. Stein


We compare some mixed methods based on different variational formulations, namely a displacement-pressure formulation employed by de Borst and coworkers, the three-field formulation investigated by Simo and Taylor and a two-field formulation which is directly based on an energy functional. It emerges that all these yield the same discrete results if the stored energy function contains a volumetric contribution 1/2k(J−1)2 whereJ is the volume dilatation, i.e., the Jacobian determinant of the deformation, andk is the bulk modulus. The equivalence holds for arbitrary 3D and plane strain elements. In the numerical examples the mixed formulations are discretized by the quadrilateral Q1/P0 and Q2/P1 elements and the triangular Crouzeix-Raviart P2+/P1 element. We also compare with standard displacement elements and the enhanced strain Q1/E4 element.


Mixed Formulation Load Increment Incompressible Material Saddle Point Problem Finite Element Space 
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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • U. Brink
    • 1
  • E. Stein
    • 1
  1. 1.Institute for Structural and Computational Mechanics (IBNM)Universität HannoverHannoverGermany

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