The Tsai-Wu and Hashin failure criterions require the specification of additional criterion parameters, which are specified by user material constants 9 and 10. Refer to the Theory Manual for a detailed description of each criterion and the auxiliary parameters.
- User material constant 9 is used to specify a parameter for the Tsai-Wu and Hashin criterions. If Tsai-Wu is selected this constant represents the cross product term, f*. If Hashin is selected this constant represents the contribution of longitudinal shear stress to the fiber failure criterion, α.
- User material constant 10 is used to specify a parameter for the Tsai-Wu criterion. In particular, this constant represents the optional equibiaxial stress at failure (σ11 and σ22 combined). This value can be left as zero if it is unknown.