NUMERICAL SIMULATION OF FINE BLANKING PROCESS USING THE CONTINUUM DAMAGE MECHANIC APPROACH

摘要

In order to accurately simulate fine blanking processes, a finite element model valid for numerically describing of such operations has been developed. The numerical simulation of the damage evolution and crack initiation and propagation have been descibed by means of contniuum damage approach. In this paper, two models for damage accumulation has been implemented in the finite element code ABAQUS by means of the user routine (UMAT). The Le Maitre damage model taking into account the influence of triaxiality has been implemented as well as damage model accumulation, based on the Rice and Tracey ductile fracture criterion allowing for the description of the exponential dependence on triaxiality stress field. The comparative study between the results obtained by the simulations using the different damage models and the experimental ones, showed that the Le Maitre damage model (LMD model) is not able to predict the fracture propagtion path in a realistic way. Only the exponential damage evolution gives good results.