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板材成形工艺中经常遇到复杂曲面形状的冲压件。如图1所示。这些零件在变形区,,足方程组中的任何一个方程,金属材料就进入塑性状态。当存在两个异向的应力分量a,和。:时,不能仅仅用其中的一个分量来判断金属材料是否进入塑性状态,必须同时考虑另一个应力分量的影响,只有两个应力分量符合一定的关系时,金属材料才进入塑性状态。我们在解决板材成形的问题时就可以根据需要来利用这种关系调整两个应力分量的值。以
Sheet metal forming process often encounter complex curved surface shape of the stamping parts. As shown in Figure 1. These parts in the deformation zone ,, foot equations of any one equation, the metal material into the plastic state. When there are two anisotropic stress components a, and. : One of the components can not be used to judge whether the metal material enters the plastic state or not. The influence of the other stress component must be taken into consideration simultaneously. Only when the two stress components are in a certain relationship, does the metal material enter the plastic state. When we solve the problem of sheet metal forming, we can use this relationship to adjust the values of the two stress components as needed. To