请教DEFORM-3D的问题，谢谢！
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我在做模拟时，预设步数为500步，每次都是跑一步就停，怎么回事啊！谢谢，急啊！而且出现
Error:--illegal flow stress detected at element # 29774 of Obj. 5
Strain, str. rate, temp. & flow stress are: 0.508248D-01 0.345747D+01 0.500000D+03 -0.515196D+04
Error:--illegal flow stress detected at element # 29775 of Obj. 5
Strain, str. rate, temp. & flow stress are: 0.433158D-01 0.294665D+01 0.500000D+03 -0.431200D+04
Program stopped because of bad element shape!
Program stopped because of negative Jacobian!
Error:--illegal flow stress detected at element # 29774 of Obj. 5
Strain, str. rate, temp. & flow stress are: 0.508248D-01 0.345747D+01 0.500000D+03 -0.515196D+04
Error:--illegal flow stress detected at element # 29775 of Obj. 5
Strain, str. rate, temp. & flow stress are: 0.433158D-01 0.294665D+01 0.500000D+03 -0.431200D+04
Program stopped because of bad element shape!
Program stopped because of negative Jacobian!
zyg3816 
