数值模拟ECAP过程中工件横截面形状对等效应变的影响

• 作 者: 罗海波 赵鹏 邱平 赵玉峰
• 机 构: 兰州理工大学理学院,
• 出 处: 热加工工艺
• 发表日期: 2014年19期
• 关键词: ECAP 等效应变 截面形状 工件中心 圆截面 上边缘 挤压过程 数值模拟 超细晶材料 方形截面

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。

Based on the DEF plastic 3D finite element method, the effect of workpiece cross-section shape on equivalent strain during single-pass ECAP extrusion was analyzed. The results show that the ECAP extrusion after the circular cross-section workpiece and the square cross-section of the front of the workpiece will have a significant bend. The maximum equivalent strain of the circular section workpiece is mainly distributed at the top and bottom of the front end of the workpiece, while the square section workpiece is mainly distributed on the upper edge of the workpiece and the bottom of the front end. The difference between the average equivalent strain accumulated on the circular section workpiece and the square section workpiece will decrease as the internal angle of the mold increases.