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Discontinuous Galerkin and the Crouzeix–Raviart element: Application to elasticity

Published online by Cambridge University Press:  15 March 2003

Peter Hansbo  and
Mats G. Larson
Peter Hansbo
Affiliation:
Department of Applied Mechanics, Chalmers University of Technology, S–412 96 Göteborg, Sweden.
Mats G. Larson
Affiliation:
Department of Mathematics, Chalmers University of Technology, S–412 96 Göteborg, Sweden.
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Abstract

We propose a discontinuous Galerkin method for linear elasticity, based on discontinuous piecewise linear approximation of the displacements. We show optimal order a priori error estimates, uniform in the incompressible limit, and thus locking is avoided. The discontinuous Galerkin method is closely related to the non-conforming Crouzeix–Raviart (CR) element, which in fact is obtained when one of the stabilizing parameters tends to infinity. In the case of the elasticity operator, for which the CR element is not stable in that it does not fulfill a discrete Korn's inequality, the discontinuous framework naturally suggests the appearance of (weakly consistent) stabilization terms. Thus, a stabilized version of the CR element, which does not lock, can be used for both compressible and (nearly) incompressible elasticity. Numerical results supporting these assertions are included. The analysis directly extends to higher order elements and three spatial dimensions.

Keywords

Crouzeix–Raviart elementNitsche's methoddiscontinuous Galerkinincompressible elasticity.
Type
Research Article
Information
ESAIM: Mathematical Modelling and Numerical Analysis , Volume 37 , Issue 1 , January 2003 , pp. 63 - 72
Copyright
© EDP Sciences, SMAI, 2003

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