镁合金板材等通道弯曲变形模拟与实验

目的通过设计一种等通道弯曲变形工艺,实现镁合金板材沿厚度方向较均匀的剪切应变。方法利用ABAQUS数值模拟并结合应变非均匀性评估方法,系统研究不同厚度镁合金板材在相同变形参数下剪切应变分布特征,比较实验结果说明模型准确性。结果等通道弯曲变形可以在不同厚度板材中实现较为均匀的剪切应变,且随着板材厚度的增加而提高。关于成形力的模拟和实验结果吻合良好,表明数值模拟方法能够较好实现ECAB变形过程的预测。结论由于该工艺能够引入均匀剪切应变,有望在镁合金板材组织和织构优化方面取得研究与应用价值。

Simulation and Experiment on Equal Channel Angular Bending of Magnesium Alloy Sheet

The paper aims to realize homogeneous distribution of shear strain along the thickness direction by designing a new equal channel angular bending process. Combined with the inhomogeneity estimation method, the software ABAQUS was adopted to investigate distribution features of shear strain and effective strain under the same deformation parameters. The forming load between simulation and experiment was compared to indicate the accuracy of simulation results. The equal channel angular bending could induce homogeneous shear strain along the thickness direction, which increased with the thickness rising. The results of simulation and experiment on forming force agreed well, showing that the established simulation model could predict the deformation behavior of equal channel angular bending. The homogeneous shear strain induced during the equal channel angular bending has the desirable application meaning for the grain refinement and texture modification of magnesium alloy sheets.