MAT_NULL空材料模型中的参数如何设置及有什么影响呢？

shiyan155165

*MAT_NULL

ID
RO：材料密度
PC：压力截断值，总是小于零。
The cut-off pressure, PC, must be defined to allow for a material to “numerically” cavitate. In other words, when a material undergoes dilatation above certain magnitude, it should no longer be able to resist this dilatation. Since dilatation stress or pressure is negative, setting PC limit to a very small negative number would allow for the material to cavitate once the pressure in the material goes below this negative value.

MU：动力粘度系数

请问这个PC大家是怎么理解，如何设置呢？