Instability and damage effects in the modeling of metal forming
In this paper we describe some recent work of our group at CEMACOM on elasto-plastic deformations with applications to metal forming and impact using numerical and experimental procedures. The basic code is METAFOR, developed by LTAS, Belgique. Initially we discuss in very general terms the procedure for the integration of stresses that may give rise to numerical instabilities and propose a solution. Then, we describe the remeshing procedure used, needed to correct the mesh distortion that appears with large plastic deformation. In the third place, we present some initial results on work with coupled effects of temperature, plasticity and damage. Finally, we describe an experimental procedure to determine in one test, both the friction coefficient and the stressstrain relation. For all this items we present numerical and/or experimental results.
damage remeshing plasticity tests friction rates