限制模压变形三维有限元模拟

Three-dimensional Finite Element Simulation of Constrained Groove Pressing

采用DEFORM-3D软件对限制模压变形(CGP)进行三维有限元模拟,研究了载荷-行程曲线的变化以及等效应变的分布规律。结果表明:限制模压变形各道次变形所需载荷差别不大;压弯过程载荷变化可分为载荷迅速增大、载荷缓慢增大和载荷迅速增大三个阶段;压平阶段载荷变化可分为载荷基本稳定、载荷迅速增大、载荷基本稳定和载荷迅速增大四个阶段。变形试样等效应变沿Y、Z方向呈现均匀分布特征,沿X方向等效应变分布可分为试样两端约2个齿宽范围的等效应变异常区和试样中部等效应变稳定周期分布区。结合试样的变形行为分析了载荷的变化规律和等效应变不均匀分布的原因。

Three-dimensional finite element simulation was carried out for analyzing the severe plastic deformation behavior during constrained groove pressing.The load variations and equivalent strain distributions were obtained.The results show that the required load for pressing during different passes is identical.The required load for groove pressing varies with increasing the displacement can be classified into three phases：rapid increase,slowly increase,another rapid increase.Whereas the required load for flatten pressing exhibits four phases：stabilizing,rapid increase,another stabilizing,and another rapid increase.The equivalent strain distributions are homogeneous along Y and Z axis but inhomogeneous along X axis.It is shown that the equivalent strain distribution along X axis can be classified into the lower regions located at both ends and the periodic variation region located at intermediate section.The different stages presented in the load versus displacement curves and the inhomogeneous distributions of equivalent strain are associated with deformation behavior.