纯钛连续等径通道转角挤压的有限元模拟

Finite Element Simulation of Equal Channel Angular Pressing for Pure Titanium

等通道转角挤压(Equal Channel Angular Pressing,ECAP)是一种制备超细晶材料的加工方法。利用ABAQUS有限元分析软件及网格再划分对纯钛的连续等通道转角挤压变形的Bc和C方式进行了三维的计算机有限元模拟,得到了应力应变分布规律和挤压力—位移曲线。结果表明,Bc方式在1、3、4道次挤压后纯钛试样的塑性应变梯度比C方式更小,而最大的压力是2道次。

Equal channel angular pressing （ECAP） is a method prepared for ultra-fine grain material. ECAP Bc and C routes for pure titanium were simulated by using finite element sotware ABAQUS and ALE remeshing. The distribution of equivalent strain and stress and the pressure-displacement curve were obtained. The results show that the strain gradient of pure titanium in Bc route is smaller than one in C after pressing 1, 3, 4 pass. And the maximum pressure is at 2 pass.