H62黄铜模压形变的有限元模拟

Finite element method simulation in groove pressing of H62 brass

用二维有限元法(FEM)模拟H62黄铜模压形变(GP)过程,根据有限元模型进行模压形变试验,分析试样等效应变的分布规律与模压形变试验后材料的组织和力学性能的关系。研究发现,试样累积的等效应变值随模压周期的增加而增加,等效应变的累积速率接近恒值,而试样表面的累积速率高于试样中心;获得的等效应变比理论应变值低。模压形变使H62黄铜晶粒细化,显微硬度提高;等效应变的分布规律与材料的组织和性能变化相对应。

A two-dimensional finite element method（FEM） was used in the simulation of groove pressing（GP） of H62 brass.Groove pressing experiments were conducted according to the FEM model.The relationship between the distribution of the equivalent strain and the structure and mechanical characteristics of the sample was analyzed.It is found that the equivalent strain increases as the increasing of the groove pressing cycles.The speed of the equivalent strain accumulated is almost constant,and the speed on the sample surface is higher than that of the center.The equivalent strain value is lower than that of the theoretical value.Proceed by the groove pressing,the grain of H62 brass is refined and the microhardness is increased.So the distribution of the equivalent strain has relation to the structure and mechanical characteristics of the sample.