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JuliaFEM.jl/test
Jukka Aho 4ff5044dc0 test(materials): add finite strain plasticity test
New 328-line test file for FiniteStrainPlasticity material model:
- Tests material construction and parameter validation
- Tests state management (FiniteStrainPlasticityState with F_p, α_bar, κ)
- Tests small strain limit (should recover small-strain plasticity)
- Tests identity deformation (F=I gives zero stress)
- Tests pure rotation (objectivity, frame-invariance)
- Tests uniaxial extension in elastic and plastic regimes
- Tests simple shear deformation
- Tests incremental loading and plastic incompressibility (det(F_p)=1)
- Tests hardening behavior (kinematic hardening via backstress)
- Tests state persistence (unloading doesn't decrease plastic strain)
- Validates type stability

Comprehensive test for geometrically exact plasticity using multiplicative
decomposition F = F_e F_p, essential for large deformation analysis.
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