Rectangular Mixed Elements for Elasticity with Weakly Imposed symmetry Condition

Details Rectangular Mixed Elements for Elasticity with Weakly Imposed symmetry Condition Rectangular Mixed Elements for Elasticity with Weakly Imposed symmetry Condition

2010-12-09

arxiv.org/abs/1012.1906v2

Mathematics

Numerical Analysis

Scientific paper

We present new rectangular mixed finite elements for linear elasticity. The approach is based on a modification of the Hellinger-Reissner functional in which the symmetry of the stress field is enforced weakly through the introduction of a Lagrange multiplier. The elements are analogues of the lowest order elements described in Arnold, Falk and Winther [ Mixed finite element methods for linear elasticity with weakly imposed symmetry. Mathematics of Computation 76 (2007), pp. 1699--1723]. Piecewise constants are used to approximate the displacement and the rotation. The first order BDM elements are used to approximate each row of the stress field.

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