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介绍单晶体模型的2种实现方法,并通过对有限元软件ABAQUS/Explicit的用户材料接口VUMAT做二次开发,实现2种单晶体模型构架和显式有限元方法的耦合。采取实体单元来存储材料信息,每个单元代表一个晶粒,在每个增量步中读取并更新晶粒取向。采用切线系数法来计算每个增量步中不同变形系统的塑性应变增量,通过硬化模型来描述硬化响应。利用编制的2种用户子程序模拟铜(FCC)单向拉伸过程、IF铁(BCC)冷轧过程和AZ31 镁合金(HCP)单向压缩过程中的织构演化,模拟结果和试验结果吻合较好。
Two kinds of realization methods of single crystal model are introduced, and the coupling of two kinds of single crystal model framework and explicit finite element method is realized through secondary development of user material interface VUMAT of finite element software ABAQUS / Explicit. Physical units are used to store material information, each cell represents a die, and grain orientation is read and updated in each incremental step. Tensile coefficient method is used to calculate the plastic strain increment of different deformation systems in each increment step, and the hardening response is described by the hardening model. The two user subroutines were used to simulate the evolution of the uniaxial drawing process of copper (FCC), the cold rolling process of IF iron (BCC) and uniaxial compression of AZ31 magnesium alloy (HCP). The simulation results agree well with the experimental results better.