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Explicit X2: large deformation, J2 and Johnson-Cook plasticity, damage and erosion (M10)

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- model: materials gain solver-neutral plastic (bilinear isotropic/kinematic,
  hardening table, Johnson-Cook with adiabatic heating), damage (Johnson-Cook
  D1-D5) and erosion (plastic strain); explicit steps gain nonlinear_geometry
  (default on) and stress_rate (jaumann | green_naghdi).
- fem: rotation (Hughes-Winget, Flanagan-Taylor), plasticity (radial return,
  capped bracketed Newton for Johnson-Cook, damage; the update takes the
  mechanical strain increment so thermal strains can be subtracted), closed-form
  hex8 gradients for deformed configurations.
- explicit: updated Lagrangian hex8/tet4, per-element material state, erosion
  with reported energy, plastic work in the energy account.
- solver: warns that the linear solver uses the elastic constants of plastic
  materials (results hash-identical).
- decks: Abaqus *PLASTIC (+ Johnson-Cook keywords), Nastran MATS1/TABLES1,
  LS-DYNA *MAT_PLASTIC_KINEMATIC / *MAT_PIECEWISE_LINEAR_PLASTICITY; what a
  format cannot express is reported as Unsupported.
- engine: model.material.plasticity, model.material.damage (catalogue ready),
  explicit element probe, eroded elements in the solve summary.

Step commits before the rebase onto the DOF framework: branch explicit-x2-steps.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm
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jyvikoandClaude Opus 5.5 authored and Irakli Kourtis committed 2026-10-13 20:52:57 -04:00
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commit 50764def18
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crates/engine/src/lib.rs
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@@ -349,6 +349,14 @@ mod tests {
json!({"name": "A", "elastic": {"type": "engineering_constants", "young": [1e-300, 1e300, 1], "poisson": [1e300, 0, 0], "shear": [0, 0, 0]}}),
json!({"name": "A", "elastic": {"type": "isotropic", "young": "stiff"}, "density": -0.0}),
json!({"name": "A", "set": "A", "material": "A", "kind": {"type": "solid"}}),
json!({"name": "Steel", "plastic": {"type": "bilinear", "yield_stress": -1e308, "hardening_modulus": f64::MAX}}),
json!({"name": "Steel", "plastic": {"type": "table", "points": vec![json!({"strain": 0, "stress": 1}); 2_000]}}),
json!({"name": "Steel", "plastic": {"type": "table", "points": [{"strain": 0, "stress": 1}, {"strain": 0, "stress": 2}]}}),
json!({"name": "Steel", "plastic": {"type": "johnson_cook", "a": 1, "b": 1, "n": -1, "room_temperature": 1e308, "melt_temperature": -1e308}}),
json!({"name": "Steel", "plastic": {"type": "johnson_cook", "a": 1, "b": 1e308, "n": 1e308, "c": 1e308, "m": 1e-308, "room_temperature": 0, "melt_temperature": 1, "taylor_quinney": 2}}),
json!({"name": "Steel", "plastic": "hard"}),
json!({"name": "Steel", "damage": {"type": "johnson_cook", "d1": 1e308, "d2": -1e308, "d3": 1e308}, "erosion": {"plastic_strain": -1}}),
json!({"name": "Steel", "damage": null, "erosion": {"plastic_strain": 1e-308}}),
json!({"name": "A", "set": "all", "material": "Steel", "kind": {"type": "beam", "profile": {"type": "pipe", "radius": 1, "thickness": 2}, "orientation": [0, 0, 0]}}),
json!({"name": "A", "set": "all", "material": "Steel", "kind": {"type": "shell", "thickness": 1e308, "offset": -0.5, "points": 4294967295u64}}),
json!({"name": "A", "xyz": [1e308, 0, 0]}),