The stress-strain matrix is not positive definite?
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The stress-strain matrix of material 1 is not positive definite, which is required for real materials. Being positive definite means that
1.0 - NUXY**2*EX/EY - NUYZ**2*EY/EZ - NUXZ**2*EX/EZ -
2.0*NUXY*NUYZ*NUXZ*EX/EZ must be positive, but is equal to
-495237.185. Consider reducing the Poisson's ratios. 请问高手这是什么原因？材性是别人用过的，应该不会错，求救!
喵工 
