Material models which have nonlinear behavior do not allow for conversion of data from one unit system to another. For these material models, specify the units of the data in the Reference Units drop-down list. In Mechanical if an attempt is made to solve the solution, in a unit system which is not compatible with the Reference Units, an error is shown and the solution is stopped. The following material models have this restriction:
The Reference Unit setting is applicable for all inputs except the Reference Temperature, where the unit can be set independently. Modification of the Reference Unit setting converts the Reference Temperature to the value corresponding to the temperature unit specified in the Reference Unit.
These material models require temperature values to be in an absolute scale. Mechanical writes all temperature inputs for a solver in °C or °F and includes a TOFFST command with the value appropriate to the solver unit system setting. This setting allows the computation of these material models to be performed correctly.