面心纯铝单向拉伸的晶体塑性学有限元模拟

基于率相关晶体塑性本构模型,实现了晶体塑性学有限元模拟过程。直接将电子背散射衍射(EBSD)获取的晶粒初始取向输入晶体塑性有限元模型,分别预测了单向拉伸面心1050纯铝过程中的力学响应与织构演化。应力应变响应数值模拟结果与实验结果有较好的一致性,同时也存在一定的偏差。两种多晶模型(Taylor模型和有限单元模型)分别模拟了单向拉伸真应变0.25和0.37时的织构演化。随着真应变的增加,两种丝织构(〈111〉织构和〈100〉织构)变得更加锋锐,模拟结果与EBSD实验测得的织构演化结果有较好的一致性。

Crystal plasticity finite element modeling of F. C. C. pure Al in unaxial tensile deformation

Crystal plasticity finite element modeling (CPFEM) is realized on the basis of crystal plasticity theory of rate dependent polycrystal constitutive relations.Initial orientations obtained by electron backscatter diffraction (EBSD) are directly input into crystal plasticity finite element model to simulating mechanical response and texture development of F.C.C.1050 pure Al in unaxial tensile deformation.Stress-strain curves of tensile deformation are analyzed.Predictions are both reasonable agreement and some little deviation with experiments.Texture evolution at tensile true strain 0.25 and 0.37 are predicted by two polycrystal models (Taylor-type model and finite element model).With the strain growth two types of fiber textures become sharper or stronger.Modeling results of textures are well accord with the experiment results.