98-1   Berichtsreihe des Mathematischen Seminars der Universität Kiel

Matthias K. Gobbert, Andreas Prohl:

A discontinuous Finite Element method for solving a multi-well problem

Many physical materials of practical relevance can attain several variants of crystalline microstructure. The appropriate energy functional is necessarily non-convex, and the minimization of the functional becomes a challenging problem. A new numerical method based on discontinuous finite elements and a scaled energy functional is proposed. It exhibits excellent convergence behavior for the energy (second order) as well as other crucial quantities of interest for general spatial meshes, contrary to standard (non-)conforming methods. Both theoretical analyses and numerical test calculations are presented and contrasted to other current finite element methods for this problem.

Mathematics Subject Classification (1991): 49M07, 65K10, 65N30, 73C50, 73S10

Keywords: Finite element method, non-convex minimization, nonlinear conjugate gradients, multi-well problem, microstructure, multiscale, nonlinear elasticity, shape-memory alloys, materials science.

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[Thu Feb 19 18:56:34 2009]
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