材料泊松比对塑性屈服的影响

The effect of Poisson ratio of material properties on plastic yield

以主剪应力作用下的十二面体形状改变为参量建立了包含材料特性参数的初始屈服条件 ;研究了材料特性对实际屈服面的影响 .结果表明 ,Mises屈服面相当于材料泊松比为 0 .5时所对应的屈服面 ;材料在弹性阶段不同的泊松比 。

In this paper, a yield criterion which contains material prop erties is established based on the change of shape of the dodecahedron subjected to principal shear stresses, and the influence of material properties upon the yield face is discussed. The study shows that Mises yield face is such a yield f ace when material Poisson ratio is named as 0.5, because material Poisson ratio is not equal to each other in elastic stage, so this is one of the reasons why p ractical yield faces differ from Mises yield face.