数值模拟ECAP过程中工件横截面形状对等效应变的影响

Effect of Cross-section Shape of Workpiece on Equivalent Strain in ECAP Numerical Simulation

基于DEFORM-3D软件的刚塑有限元法,分析了单道次ECAP挤压过程中工件截面形状对等效应变的影响。结果表明:ECAP挤压后圆截面工件和正方形截面工件的前端均会产生明显的弯曲。圆截面工件的最大等效应变主要分布在工件前端顶部和底部,而正方形截面工件主要分布在工件上边缘和前端底部。累积在圆截面工件和正方形截面工件上的平均等效应变量的差值将随着模具内角的增大而减小。

The effect of cross-section shape of workpiece on equivalent strain was analyzed based on DEFORM-3D software of the rigid-plastic finite element method in single pass of ECAP. The results indicate that the heads of workpiece with circular and square cross-section shape produce winding obviously after ECAP. The maximum equivalent strain mainly distributes at the top and bottom of workpiece head for circular cross-section shape and at the top edge of workpiece and the bottom of workpiece head for square cross-section shape. The difference of mean equivalent strain accumulated in the workpiece with circular and square cross-section shape decreases with the increase of die interior angle.