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为确定符合板材变形规律的韧性断裂准则中的材料常数,基于传统M-K模型框架并进行修正,结合单向拉伸和平面应变试验数据,提出一种新的韧性断裂准则材料常数计算模型。利用MATLAB软件编写该计算模型的算法程序,得到应用于铝镁合金5A06-O板材的不同韧性断裂准则材料常数。同时将C&L韧性断裂准则嵌入Abaqus/Explicit显示模块的用户材料子程序VUMAT。在200℃的条件下,对铝镁合金5A06-O板材在热介质胀形和充液热拉深中的断裂行为进行数值模拟,并与相同工艺参数下的试验所得结果作对比。结果表明,热介质胀形高度误差为6.2%,充液热拉深深度误差为8.5%,验证了韧性断裂准则材料常数计算模型的正确性,表明了C&L韧性断裂准则在板材充液热成形中的适用性。
In order to determine the material constants in the ductile fracture criterion which is in line with the deformation law of sheet metal, a new model for calculating the material constants of ductile fracture criterion is proposed based on the traditional M-K model framework and the uniaxial tension and plane strain test data. The algorithm program of the calculation model was programmed by using MATLAB software, and the material constants of different toughness fracture criteria applied to the 5A06-O sheet of aluminum-magnesium alloy were obtained. At the same time, C & L ductile fracture criteria are embedded in the user material subroutine VUMAT of the Abaqus / Explicit display module. At 200 ℃, the fracture behavior of 5A06-O aluminum-magnesium alloy plate in the heat medium bulging and hot drawing was numerically simulated and compared with the experimental results under the same process parameters. The results show that the height error of bulging heat medium is 6.2%, and the depth error of liquid deep drawing is 8.5%. The correctness of the material constancy model of the ductile fracture criterion is verified, which shows that the C & L ductile fracture criterion is in the hydroforming of sheet metal Applicability.