Analysis of anisotropic model and the effect of friction coefficient in a stretch forming process applied to AA2024 thin sheet

Abstract : The deep drawing numerical simulation problem represents today an important interest for a sheet forming engineering design. This paper presents the results of Finite Elements Simulation of a stretch forming test based on the anisotropic mechanical behavior describing an AA2024 aluminum alloy. The numerical simulations applied to thin sheets are made using a Hill'48 anisotropic elasto-plastic model. The corresponding material coefficients are measured at 0°, 45° and 90° relative to the rolling direction to take into account the metallic sheet anisotropy. The samples cutting directions relative to the rolling one correspond to the above mentioned angles. Furthermore this study analyzes the effects of the Coulomb friction coefficient on the maximal principal stresses variation and on the obtained punch loads-displacement curves.