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A Nitsche extended finite element method for incompressible elasticity with discontinuous modulus of elasticity

Abstract : In this note we propose a finite element method for incompressible (or compressible) elasticity problems with discontinuous modulus of elasticity (or, if compressible, Poisson's ratio). The problem is written on mixed form using P1–continuous displacements and the space of piecewise P0 pressures, leading to the possibility of eliminating the pressure beforehand in the compressible case. In the incompressible case, the method is augmented by a stabilization term, penalizing the pressure jumps. We show a priori error estimates under certain regularity hypothesis. In particular we prove that if the exact solution is sufficiently smooth in each subdomain then the convergence order is optimal.
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https://hal.inria.fr/inria-00341737
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Submitted on : Tuesday, November 25, 2008 - 6:15:28 PM
Last modification on : Thursday, February 11, 2021 - 2:40:03 PM
Long-term archiving on: : Thursday, October 11, 2012 - 12:06:25 PM

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R. Becker, Erik Burman, Peter Hansbo. A Nitsche extended finite element method for incompressible elasticity with discontinuous modulus of elasticity. [Research Report] 2008. ⟨inria-00341737⟩

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