请教关于johnsoncook模型中spall的定义

caat

在定义johnsoncook材料模型的时候,对下面不理解,希望高手指教,谢谢
PC :=Failure stress or pressure cutoff (pmin < 0.0).
SPALL :=Spall type:
EQ.0.0: default is set to 2.0,
EQ. 1.0: p => pmin ,
EQ. 2.0: if sigma-max  => -pmin element spalls and tension, p < 0, is never allowed (default),
EQ. 3.0: p < -pmin element spalls and tension, p < 0, is never allowed.
请问一下PC是不是  定义的那个失效参数
还有SPALL 等于1和等于3具体是什么意思啊  谢谢了
在定义johnsoncook材料模型的时候,对下面不理解,希望高手指教,谢谢
PC :=Failure stress or pressure cutoff (pmin < 0.0).
SPALL :=Spall type:
EQ.0.0: default is set to 2.0,
EQ. 1.0: p => pmin ,
EQ. 2.0: if sigma-max  => -pmin element spalls and tension, p < 0, is never allowed (default),
EQ. 3.0: p < -pmin element spalls and tension, p < 0, is never allowed.
请问一下PC是不是  定义的那个失效参数   就是说要定义为负值？？？
还有SPALL 等于1和等于3具体是什么意思啊  具体是什么工况啊？？  是怎样一种失效情形啊？？
谢谢了  谢谢