Analysis of FCC sheet metal forming with rate-independent polycrystalline plasticity FEM

摘要

A rate-independent polycrystalline plasticity constitutive model considering self and latent hardening was developed. Next, a new orientation probability assignment method was proposed and the crystal orientations were assigned to FE integration points, which represent crystals and can rotate individually. Then cop drawing of FCC aluminum sheet was studied using crystalline plasticity finite element analysis. The results show that the validity of proposed model is proved through comparison between numerical results and experimental ones. {001} <110> texture can lead to earing at 45 deg direction, while {124} <211> texture at 0 deg and 9 deg directions. For the rolled aluminum sheet, which contains strong {001} <110> texture, earing is formed at 45 deg direction after cup drawing. For the annealing aluminum sheet, due to the balance between two main textures, the flange earing tendency is not obvious.