add euler beam uel phase

2026-06-11 11:08:44 +09:00
parent 986cc9888e
commit 3f6275201e
11 changed files with 625 additions and 0 deletions
@@ -0,0 +1,61 @@
+# Step 1: research
+
+## Read First
+
+- `/AGENTS.md`
+- `/docs/ABAQUS_SUBROUTINE_AGENT_DESIGN.md`
+- `/docs/ARCHITECTURE.md`
+- `/docs/ADR.md`
+- `/.codex/skills/abaqus-subroutine-research/SKILL.md`
+- `/.codex/skills/fem-theory-query/SKILL.md`
+- `/docs/requirements/uel-3d-euler-beam.md`
+- `/docs/research/README.md`
+
+## Task
+
+Create `/docs/research/uel-3d-euler-beam-research.md`.
+
+Research only the evidence needed to support a two-node 3D Euler-Bernoulli beam `UEL` implementation and validation plan. Separate:
+
+- Source-backed facts.
+- Inferences made from those facts.
+- Applicability limits for this implementation.
+
+Cover at minimum:
+
+- Abaqus/Standard `UEL` responsibilities for `RHS`, `AMATRX`, `SVARS`, `ENERGY`, `NDOFEL`, `NNODE`, `MCRD`, `LFLAGS`, `PROPS`, `COORDS`, `U`, `DU`, and `JPROPS`.
+- Euler-Bernoulli 3D beam stiffness matrix in local coordinates for axial, torsion, bending about local 2 and local 3 axes.
+- Local-to-global transformation for two-node beam elements, including orientation-vector edge cases.
+- Residual sign convention needed by Abaqus `UEL`.
+- Verification benchmarks appropriate for no-Abaqus tests and external Abaqus CSV comparison.
+
+Prefer official Abaqus documentation and reliable FEM references. Public example repositories may be used only as learning references, not acceptance evidence, unless license/version/provenance are documented.
+
+Do not create or modify Fortran source, tests, reference artifacts, or implementation plans in this step.
+
+## Tests To Write First
+
+- None. This is a research artifact step.
+
+## Acceptance Criteria
+
+```bash
+python -m unittest discover -s scripts -p "test_*.py"
+python scripts/validate_reference_artifacts.py
+python scripts/validate_workspace.py
+```
+
+The step is complete only when the research document cites sources and clearly marks facts, inferences, and applicability limits.
+
+## Validation Notes
+
+- Abaqus execution remains external to this repository.
+- Update `/phases/uel-3d-euler-beam/index.json` step 1 with `completed`, `error`, or `blocked` and a concrete summary or reason.
+
+## Forbidden
+
+- Do not add JavaScript/TypeScript/npm fallback.
+- Do not run Abaqus analyses from this project.
+- Do not generate reference CSVs.
+- Do not create Fortran production source.
+- Do not break existing tests.