Several finite element methods for large deformation elastic problems in the nearly incompressible and purely incompressible regimes are considered. In particular, the method ability to accurately capture critical loads for the possible occurrence of bifurcation and limit points, is investigated. By means of a couple of 2D model problems involving a very simple neo-Hookean constitutive law, it is shown that within the framework of displacement/pressure mixed elements, even schemes that are inf-sup stable for linear elasticity may exhibit problems when used in the finite deformation regime. The roots of such troubles are identi-fied, but a general strategy to cure them is still missing. Furthermore, a comparison with displacement-based elements, especially of high order, is presented.
|Titolo:||Approximation of incompressible large deformation elastic problems: some unresolved issues|
BEIRAO DA VEIGA, LOURENCO (Secondo)
|Parole Chiave:||Incompressible nonlinear elasticity; Mixed finite elements; Stability; Computational Theory and Mathematics; Mechanical Engineering; Ocean Engineering; Applied Mathematics; Computational Mathematics|
|Settore Scientifico Disciplinare:||Settore MAT/08 - Analisi Numerica|
|Data di pubblicazione:||2013|
|Digital Object Identifier (DOI):||10.1007/s00466-013-0869-0|
|Appare nelle tipologie:||01 - Articolo su periodico|