The content of the User Material Relationships file, MyCompany_UserMat_Relationships.xml, is illustrated below. Your material model may require specific material data, such as Density in order for it to be computed. This file defines those types of dependencies and also defines the mutual exclusions for your material model(s).
The PropertyDependencies element provides all material property dependencies. A given property is specified which then contains those properties which it is dependent upon.
Note:
The string for the name attribute must be the same as that used in the MyCompany_UserMat_Properties.xml file for the name of the user-defined material model to be valid. An example of this entry is shown below.
Make sure that your tags are properly formatted with beginning ("<") and ending ("/>") characters.
Mutual Exclusions
A user-defined material model may not be able to be used with other material data (e.g. isotropic elasticity) because the user-defined material model provides the needed computation (e.g. elasticity). The relationships file enables you to specify this information so that when a user would add the user-defined material model to the material the other material properties or models will be suppressed automatically if in the material.
Any mutual exclusion to other material models is defined within the MutualExclusions element. You use the subelements (ModelData) to specify those models which cannot be used together. There can be more than one MutuallyExclusive element specified. Add the ModelData line multiple times with a string as a property name which cannot be used with the user-defined material model.