Add Drucker-Prager plasticity with apex return - #10

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feature/drucker-prager

Commits on Apr 22, 2026

Add J2 plasticity with policy-based yield functions and material_ref
petlenz
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04b1f12
Add general plasticity framework alongside monolithic J2
petlenz
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4f06427
Remove untested decomposed plasticity files — dead code with wrong tangent
petlenz
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7bfa3b2
Apply code review fixes
petlenz
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7cc18c7
Add Butcher tableau RK integrators with curing validation
petlenz
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b3d79a5
Replace hand-rolled Gaussian elimination with Eigen LU in implicit RK integrator
petlenz
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0362599
Use Eigen matrices for Butcher tableau and all RK integrators
petlenz
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9770b48
Pre-allocate all RK working vectors — zero heap allocation per compute()
petlenz
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8e2dd77
DIRK: pre-compute stage types and diagonal values at construction
petlenz
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fdf8ed4
Add decomposed plasticity_integrator with machine-precision tangent
petlenz
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8645dcb
Add rk_plasticity: multi-stage Butcher tableau return mapping
petlenz
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8594260
Consolidate: 6 files → 2 (unified RK integrator + plasticity with tableau)
petlenz
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6832bb6
Split plasticity into clean simple + RK classes with shared utils
petlenz
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6150c21

Commits on May 17, 2026

Add Drucker-Prager apex return, fix tangent consistency, refactor return mapping
petlenz
committed
aaa6614