CONTROL OF DAMAGE IN FLANGES HYDROFORMING

In the flanges hydroforming processes, the research of the way to control loading in pressure and blankholder load are often long and tiresome. One proposes a numerical control methodology based on an approximation per pieces of the objective and constraints functions compared to the control variables. This method allows the construction step by step ways of controlled loading with respect to the required objectives A meshless method to build the objective function approximation in order to guarantee a good representation of the real objective function. An application is proposed that consists to minimize the development of the ductile damage during a stamping operation with pressure to reach a rather high deep drawing. One carried out then the coupling between the ductile damage model and the finite element code and for reasons of simplicity, one works with isotropic damage assumptions.