新型等通道转角模具挤压AZ91D镁合金的数值模拟

Numerical simulation of a process of magnesium alloy AZ91D in a new ECAP die

设计了一种新型的等通道转角挤压模具外形并推导出了在该模具中变形工件上分布的等效应变的理论公式。基于该公式,采用3D有限元分析技术,分析了Ψ值的变化对工件变形的应变分布和挤压所需的最大载荷的影响。模拟的平均等效应变值和理论值非常吻合,Ψ=40°时,工件上的等效应变分布最为均匀;Ψ的增大将导致最大载荷的逐渐减小,且下降的幅度越来越小。

A new Equal-channel angular pressing （ECAP）die which has a new geometry was designed. A more comprehensive formula which can be used to estimate the equivalent strain was established.The effect of an angler Ψ on the distribution of the equivalent strain and the maximum load was analyzed by 3D finite element analysis （FEA）in this paper.The simulate result of mean equivalent strain was consistent with the theoretical value.In these situations,the distribution of the equivalent strain on the workpiece was the most homogeneous when theΨ equals to 40°.