AZ31镁合金板材温热冲压成形微观损伤分析

Microscopic Damage Analysis of AZ31 Magnesium Alloy Sheet in Thermal Stamping

在Gurson损伤模型的基础上,采用有限元数值模拟与温热冲压实验的方法,对镁合金板材的温热冲压成形材料损伤过程进行了预测。采用单轴拉伸试验数据与数值迭代计算,确定了Gurson模型中所需要的材料参数。使用商用有限元软件ABAQUS模拟得到了镁合金板材温热冲压过程中微孔洞的演变及分布规律。研究结果表明,板材中微孔洞的分布与实验数据相吻合。因此,说明所提的方法可以应用于金属板材温热冲压成形性的预测。

On the basis of Gurson model, the damage process of thermal stamping forming magnesium alloy sheet was predicted by employing the finite element simulation and related test of thermal stamping. The material parameters employed in the Gurson model were determined through uniaxial tensile test and numerical iterative computation. The distribution and evolution of microvoid in thermal stamping of AZ31 sheets were obtained by using commercial finite element soft＇ware ABAQUS. The research results show that the distribution of microvoids is agree well with the experimental data. Therefore, it indicates that the presented approach can be employed in formability prediction of thermal sheet metal forming process.