Jukka Aho 64b148a9bb docs(book): Add J2 perfect plasticity implementation guide ...

- von Mises yield criterion with kinematic hardening
- Radial return mapping algorithm for plastic correction
- Additive strain decomposition (elastic + plastic)
- Associative flow rule and consistent tangent
- Performance: 76 ns elastic, 108 ns plastic (4.8× faster than AD)
- Zero-allocation elastic path, minimal plastic allocation
- 668 lines: Complete plasticity implementation documentation

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adr-004-integration-points-api.md

docs: Add ADR-004 for zero-allocation integration points API

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adr-005-element-integration-point-indices.md

docs: Add ADR-005 on integration point indices architecture

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deformation_gradient_implementation.md

docs(book): Add deformation gradient implementation analysis

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element_assembly_implementation.md

docs(book): Add traditional element assembly implementation guide

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linear_elastic_implementation.md

docs(book): Add LinearElastic material implementation guide

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neo_hookean_implementation.md

docs(book): Add NeoHookean hyperelastic implementation guide

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perfect_plasticity_implementation.md

docs(book): Add J2 perfect plasticity implementation guide

2025-11-12 01:06:49 +02:00