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JuliaFEM.jl/test
Jukka Aho 7919a1fffa test: Add perfect plasticity material model validation
- Tests PerfectPlasticity with J2 von Mises yield criterion and linear hardening
- PlasticityState tracking: ε_p (plastic strain), α (backstress), κ (plastic work)
- Elastic loading: small strain below yield → no plastic strain
- Plastic loading: strain beyond yield → radial return mapping
- Von Mises yield surface: f = √(3/2·s:s) - σ_y ≤ 0
- Hardening behavior: H > 0 (kinematic hardening) vs H = 0 (perfect plasticity)
- Incremental loading: monotonic stress and plastic strain accumulation
- Bauschinger effect: cyclic loading with backstress evolution
- Pure shear: τ_yield = σ_y/√3 validation
- Consistency check: yield criterion satisfaction at all strain levels
- Tests both simplified interface and full state-passing API
- Zero allocation and type stability verification
- 293 lines validating elastoplastic material behavior with Tensors.jl
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