Mechanical Properties and Constitutive Equations#

This section of the material property input specifies the type of model, for both solids and fluids, that relates stress and strain (or strain-rate) as well as the various parameters for these models. Models for solids are relatively simple compared to solid mechanics codes but cover the primary needs in fluid-solid problems. The models for fluids are quite extensive, covering Newtonian, generalized-Newtonian, rate-dependent models, thermally-dependent models, curing and particleladen models and combinations of these. These properties are used in the solid and fluid momentum conservation equations.