The material property expressions stored in the Material Library contain calls to the corresponding material property functions using input variables (arguments) as in Table 2-12. The default variable name can be changed in the property expressions to match actual variable names in a model. When a material property is used by a physics feature set to retrieve the property From material this is not necessary. In that case, the actual variable are retrieved from the Model Inputs section of the same feature and automatically substituted into the material property expression.

If you, on the other hand, want to access material properties from a material explicitly, you need to make sure that the function argument variables used in the property expressions exist and can be evaluated in the model. For example, if the variable T2 is used for temperature, change the argument of the property functions from T to T2 in the expressions.