NINI
55 lines
1.6 KiB
Markdown
55 lines
1.6 KiB
Markdown
# Sprint Contract: MITC4 Covariant Strain Tying
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## Objective
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Implement or rebuild the degenerated-continuum displacement interpolation, direct covariant strain rows, and MITC transverse shear tying interpolation.
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## Required Reading
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- /AGENTS.md
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- /docs/MITC4_FORMULATION.md
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- /docs/NUMERICAL_CONVENTIONS.md
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## Scope
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- Implement five-DOF local displacement interpolation.
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- Transform global rotations to local `alpha`, `beta`, and `gamma`.
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- Compute direct covariant strain rows in documented internal strain order.
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- Replace `eps_13` and `eps_23` with midside MITC tying interpolation.
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- Add finite-difference tests for strain rows.
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## Allowed Files
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- `include/`
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- `src/`
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- `tests/`
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- `PLAN.md`
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- `PROGRESS.md`
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## Explicit Non-Goals
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- Do not integrate stiffness.
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- Do not add material transform.
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- Do not compute MITC shear from Cartesian `gamma_xz` and `gamma_yz` first.
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## Tests To Write First
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- Local rotation transform tests for `alpha`, `beta`, `gamma`.
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- Displacement interpolation tests at midsurface and through-thickness points.
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- Direct covariant strain finite-difference tests.
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- Tying-row tests at `A`, `B`, `C`, and `D`.
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- Gauss-point MITC shear interpolation tests proving rows come from tying rows.
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## Reference Artifacts
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- None.
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## Acceptance Commands
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```bash
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python scripts/validate_workspace.py
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```
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## Evaluator Checklist
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- Strain vector ordering is documented or explicitly permuted.
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- `gamma` does not contribute to physical continuum strain.
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- FESA sign convention for `A/C/B/D` is tested.
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## Handoff Requirements
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- Record strain/tying readiness in `PROGRESS.md`.
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## Do Not
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- Do not reintroduce direct Gauss-point transverse shear for MITC rows.
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