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January  2009, 8(1): 95-121. doi: 10.3934/cpaa.2009.8.95

Reduced symmetry elements in linear elasticity

Daniele Boffi 1, , Franco Brezzi 2, and  Michel Fortin 3,

1. 

Dipartimento di Matematica, CeSNA and Università di Pavia, Via Ferrata 5, 27100 Pavia, Italy
2. 

CeSNA, IUSS, IMATI-CNR, Via Ferrata 5, 27100, Pavia, Italy
3. 

GIREF, Université Laval, Canada

Received  April 2008 Revised  August 2008 Published  October 2008

In continuum mechanics problems, we have to work in most cases with symmetric tensors, symmetry expressing the conservation of angular momentum. Discretization of symmetric tensors is however difficult and a classical solution is to employ some form of reduced symmetry. We present two ways of introducing elements with reduced symmetry. The first one is based on Stokes problems, and in the two-dimensional case allows to recover practically all interesting elements on the market. This however is (definitely) not true in three dimensions. On the other hand the second approach (based on a very nice property of several interpolation operators) works for three-dimensional problems as well, and allows, in particular, to prove the convergence of the Arnold-Falk-Winther element with simple and standard arguments, without the use of the Berstein-Gelfand-Gelfand resolution.
Keywords: reduced symmetry., mixed formulations, Linear elasticity.
Mathematics Subject Classification: Primary: 65N30; Secondary: 74S0.
Citation: Daniele Boffi, Franco Brezzi, Michel Fortin. Reduced symmetry elements in linear elasticity. Communications on Pure and Applied Analysis, 2009, 8 (1) : 95-121. doi: 10.3934/cpaa.2009.8.95
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