Impact of the Numerical Simulation on the Study of Formability Coated Thin Sheets: Case of Dual-Phase Steels DP600

Abstract The formability of thin sheets governs the feasibility of plastic deformation and shaping processes. Consequently, the identification of the laws of behaviour and its damage mechanisms proved to be necessary to master and validate the operating modes of the processes of obtaining the finished stampings. This is established using the standardized Erichsen test, whose responses in Erichsen index and division of constraints coupled with local aspects of damage allow decision-making to be established in order to arrive at a strategy of productivity and quality shaping. The present work deals with these aspects for the case of Fe-Zn coated thin sheets deposited on a grade of Duals-Phases steels (DP600) in order to take them into account via the identification of the models of the damageable behaviour required according to the formulation of the Gurson-Tvergaard-Needleman (GTN) law. To do this, experiment plans combined with EF simulation have been adopted according to the concepts of Response Surfaces Methodology (RSM). As a result, taking into account the presence of Fe-Zn coating will optimize the stamping processes on an industrial scale without causing its decohesion during shaping by plastic deformation.KeywordsDP600GTN damage modelErichsen test