等通道转角多道次挤压有限元模拟

Finite element simulation of multiple passes equal channel angular pressing process

等通道转角挤压(Equal Channel Angular Pressing,ECAP)是一种制备超细晶材料的新工艺。工艺路径的选择对试样的应变分布均匀性有重要的影响。利用非线性有限元软件MSC.Marc对等通道转角多道次挤压过程进行了模拟计算。通过对ECAP中试样沿A路径和C路径6道次挤压的模拟,获得了A路径和C路径等效应变分布规律。结果表明,试样沿C路径的等效应变要比沿A路径更均匀,但C路径对试样端部等效应变的累积效果不如A路径;试样沿A、C两种路径每道次最大挤压力逐渐增加,大小基本相同。

Equal channel angular pressing （ECAP） is a new technology for obtaining ultra-fine grain materials. Choice of technologic route will greatly affect the uniformity of the strain distribution of workpiece. Non-linear finite-element software MSC. Marc was employed to simulate equal channel angular pressing （ECAP） process of multiple passes. The distributing rules of equivalent effective strain after six passes in route A and route C were obtained. The results show that equivalent effective strain of workpiece in route C is more homogeneous than that in route A, but cumulate equivalent effective strain of workpiece end in route C is not as good as that in route A. The maximum load of per pass is increased gradually and it is basically almost the same in route A and in route C.