When thermal and TRIP strains are computed, they can be used in a Solid Mechanics interface as an inelastic strain contribution. The contributions from thermal and TRIP strains are added to form a total strain contribution. In the Solid Mechanics interface, this contribution is used additively in the case of an additive strain definition or used to form an inelastic-deformation-gradient contribution in the case of geometric nonlinearity with nonlinear strains; see Inelastic Strain Contributions. In the latter case, the contribution is used multiplicatively.