There were 2 flavors of small-strain J2 models. This combines them into one.
When I first created the nonlinear hardening models, I didn't immediately fold them into the existing J2 material model because it had a feature (kinematic hardening) that I didn't want to deal with while making the other generalizations to the return map algorithm. This PR implements kinematic hardening in the general J2 model, making the linear-only J2 model implementation redundant.
In more detail, this PR will do the following:
Add linear kinematic hardening to the small-strain J2 plasticity model, making the old implementation redundant.
Remove the redundant small-strain J2 plasticity model
Turn Sam's implementation of the J2 verification problem (from Brannon and Leelavanichkul, 2009) into an actual gtest case, using the unified J2 model
Rename the single small-strain J2 model to J2SmallStrain
There were 2 flavors of small-strain J2 models. This combines them into one.
When I first created the nonlinear hardening models, I didn't immediately fold them into the existing J2 material model because it had a feature (kinematic hardening) that I didn't want to deal with while making the other generalizations to the return map algorithm. This PR implements kinematic hardening in the general J2 model, making the linear-only J2 model implementation redundant.
In more detail, this PR will do the following:
J2SmallStrainJ2I'm open to discussion on the renames.