The efficient development and optimisation of cold forging technology need more and more use of the finite element analysis. The up-to-date modelling of large strain mechanical problems requires to take into account the constitution of the material microstructures. The initial microstructures of engineering materials such as steels and aluminium alloys are often more or less microvoided, or inclusions content. A realistic prediction of the damage evolution during the forging sequence allows us to avoid defects initiation and control the final physical caracteristics of the mechanical parts. The microvoids come from heterogeneities, second-phase particles (inclusions) and precipitates existing within the material.
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