纯铜带背压ECAP工艺塑性变形过程的有限元模拟

Finite Element Simulation of Fine Copper Plastic Deformation Process of Equal Channel Angular Pressing with Backpressure

采用ABAQUS软件模拟了不同背压下纯铜试样在经过Bc路径的ECAP挤压过程。结果表明:施加背压后,等效应变分布可划分为小变形区和稳定变形区,且与通道壁形成间隙;随背压增加,等效塑性应变增大,等效塑性应变的主要变化区减小,变形不均匀性增加,变形区面积先减小后增大;最理想背压为100 MPa。

The equal channel angular pressing fine copper sample with different backpressures in route Bc was simulated by the software ABAQUS. The results show that： the equivalent strain distribution can be divided into small deformation zone and stable deformation zone after applying backpressure, and a gap is formed with the channel wall; with the increase of back pressure, the equivalent plastic strain increases, major changing area of equivalent plastic strain decreases, uneven deformation increases, and deformation area first decreases and then increases; the ideal backpressure is 100 MPa.