FEM SIMULATION OF DEEP-DRAWING OF TEXTURED ALUMINUM SHEETS USING ANISOTROPIC 4TH-ORDER STRAIN-RATE POTENTIAL

An anisotropic (texture based) fourth order strain-rate potential is d irectly used in an elastoplastic finite element code (ABAQUS). The met hod is based on the Taylor model of crystal plasticity and therefore t akes the initial texture, texture evolution and its influence on defor mation-induced anisotropy into consideration. The deep drawing simulat ions of cold-roiled and annealed aluminum sheets with different textur e intensities are carried out using this code in conjunction with the UMAT subroutine. The full geometry of deep drawing tools and friction effect are also taken into account in these simulations by employing s hell elements. Comparison of the predicted and measured ear profiles i s conducted. Reasonable agreement is obtained between the predicted an d measured earing profiles for strong and weak textured sheets. The tr end of the influence of texture evolution on earing behavior is clearl y demonstrated. The predictions for annealed aluminum sheets are much better than the rolled ones. The earing characteristic of ideal textur es appearing in aluminum sheets is also discussed. It is shown that Cu component exhibits lower earing cup in deformation texture components appearing in aluminum sheets.