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Locking free matching of different three dimensional models in structural mechanics

Published online by Cambridge University Press:  26 April 2007

Patrick Le Tallec and
Saloua Mani Aouadi
Patrick Le Tallec
Affiliation:
École polytechnique, 91128 Palaiseau Cedex, France. patrick.letallec@polytechnique.fr
Saloua Mani Aouadi
Affiliation:
Faculté des Sciences de Tunis, Campus Universitaire, 1060 Tunis, Tunisie.
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Abstract

The present paper proposes and analyzes a general locking free mixed strategy for computing the deformation of incompressible three dimensional structures placed inside flexible membranes. The model involves as in Chapelle and Ferent [Math. Models Methods Appl. Sci.13 (2003) 573–595] a bending dominated shell envelope and a quasi incompressible elastic body. The present work extends an earlier work ofArnold and Brezzi [Math Comp.66 (1997) 1–14] treating the shell part and proposes a global stable finite element approximation by coupling optimal mixed finite element formulations of the different subproblems by mortar techniques. Examples of adequate finite elements are proposed. Convergence results are derived in two steps. First a global inf-sup condition is proved, deducedfrom the local conditions to be satisfied by the finite elements used for the external shell problem, the internal incompressible 3D problem, and the mortar coupling, respectively. Second, the analysis ofArnold and Brezzi [Math. Comp.66 (1997) 1–14] is extended to the present problem and least to convergence results for the full coupled problem, withconstants independent of the problem's small parameters.

Keywords

3D couplingmixed formulationsshellsincompressible elasticitymortar elementsdelinquent modesinf-sup conditionlocking free approximations.

Information

Type
Research Article
Information
ESAIM: Mathematical Modelling and Numerical Analysis , Volume 41 , Issue 1 , January 2007, pp. 129 - 145
Copyright
© EDP Sciences, SMAI, 2007

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