【摘要】 金属板材的织构特性及其演化是板材各向异性的主要原因.采用"连续迭代法"确定开动滑移系并计算塑性应变率,以潜在硬化模型描述应变硬化,根据取向分布函数在取向空间中的分布规律将晶体取向分配给各个单元的积分点,建立了弹塑性大变形条件下的率无关多晶体塑性模型,并将其引入动力显式有限元法.对退火铝板筒形件拉深成形过程进行了模拟,并与实验结果进行了对比分析.结果表明,模拟结果与试验结果具有较好的一致性.铝板经过退火处理后,晶体取向主要为两种织构组分共存.在两种织构组分的相互制衡下,冲杯不具有明显的制耳现象.更多还原

【Abstract】 During deformation process, the crystal orientations would gradually rotate around some ideal orientations, and then would affect the later deformation properties of sheet metal. A rate-independent polycrystalline plasticity constitutive model considering self and latent hardening is developed. A new "successive integration method" used to determine slip system is applied to calculate the plastic strain in this model. And an orientation assignment method is proposed. Every integration point is a single crystal. Next, cup drawing of FCC aluminum sheet is studied using crystalline plasticity finite element analysis, and the validity of proposed model is proved by comparing numerical results and experimental ones. For the annealing aluminum sheet, the flange earing tendency is not obvious due to the balance between two main textures.更多还原