关于高数侵彻 板子失效类型选择那一项MNPRES:=Minimum pressure at failure, SIGP1:=Principal stress at failure, Sigma max .SIGVM:=Equivalent stress at failure, Sigma maxMXEPS:=Maximum principal strain at failure, 蔚max EPSSH:=Shear strain at failure, r max .SIGTH:=Threshold stress, Sigma 0 .