纯铝单向压缩过程的晶体塑性有限元模拟

Crystal Plasticity Finite Element Modeling Uniaxial Compression of Pure Al

在率相关晶体塑性理论框架下,分别将Taylor模型和有限单元模型两种多晶模型嵌入有限元程序ABAQUS中,实现了纯铝单向压缩过程的晶体塑性有限元模拟。直接将电子背散射衍射(EBSD)获取的晶粒初始取向输入UMAT子程序,预测了单向压缩1050纯铝过程的力学响应与变形织构演化。结果表明:模拟力学响应结果与试验结果有较好的一致性,同时也存在一定偏差。随着真应变的增加,压缩丝织构(<110>织构)趋于锋锐,模拟结果与EBSD试验测得的织构演化结果能较好地吻合。

In the framework of rate dependent crystal plasticity theory, two polycrystal models were incorporated into finite element code ABAQUS to realize the uniaxial compression simulation of pure Al by crystal plasticity finite element method （CPFEM）. The initial crystal orientations from electron backscattered diffraction （EBSD） were input into UMAT directly. Mechanical response and texture development of 1050 pure Al during uniaxial compression were predicted. It shows mechanical response results of modeling and experiment have reasonable agreement and some little deviation. With the strain increasing compression fiber texture （〈110） fiber texture） tends to sharper, predictions of texture development are well accord with the EBSD measured results.