Worked examples
Each one takes a model from its equations to a checked implementation, and says plainly which parts ddsdde does for you and which it does not.
J2 plasticity
A complete transparent benchmark: von Mises plasticity with isotropic hardening, the return mapping, the algorithmic tangent, the generated subroutine and every verification result.
Read →Damage mechanics
Implementing continuum damage in Abaqus: choosing damage variables, enforcing irreversibility, the softening tangent, mesh dependence and viscous regularisation.
Read →Hyperelasticity
Implementing a hyperelastic model in Abaqus: which stress measure the solver wants, the difference between the material and spatial tangent, volumetric-deviatoric splits and what to check.
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