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test: add mitc4 patch benchmark coverage

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2026-05-04 23:05:01 +09:00
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@@ -205,6 +205,19 @@ Final benchmark tolerances must be stored with each reference case.
| Pinched cylinder | Curved shell bending/membrane behavior | loaded-point displacement |
| Twisted beam | Warped shell and drilling sensitivity | tip displacement/rotation |
### Step 11 Analytic Patch And Benchmark Scaffold
The first MITC4 patch-test layer is kept local and analytic so it does not depend on Abaqus execution or stored CSV artifacts.
Current in-repository coverage:
- Constant membrane patch: verifies uniform local `[eps11, eps22, gamma12]` strain at all `2 x 2 x 2` samples and positive physical energy.
- Pure bending patch: verifies membrane-free midsurface bending behavior, through-thickness antisymmetry, and positive physical bending energy.
- Pure transverse shear patch: verifies constant `gamma13` reproduction through the MITC tying path.
- Pure twist patch: verifies bilinear transverse-shear reproduction for `w = twist * x * y`, covering the locking-sensitive twist/shear interpolation path before curved benchmarks.
- Drilling sensitivity negative check: verifies membrane patch energy is unchanged by drilling scale changes when no drilling DOF participates.
- Thin one-element cantilever strip: verifies tip displacement increases materially as thickness decreases, providing an early shear-locking sensitivity smoke test rather than a final convergence benchmark.
Scordelis-Lo roof remains a named benchmark scaffold for Phase 1 planning, but it is not executable in the current Step 11 test layer because Phase 1 does not yet support pressure loads and does not yet have an accepted curved-shell Abaqus reference artifact. The first executable Scordelis-Lo sprint must define load representation, normalized input compatibility, stored displacement reference data, and scale-aware displacement tolerances before it is used as an automated acceptance case.
## Minimum Phase 1 Acceptance
Before MITC4 Phase 1 is considered credible:
- All parser smoke tests pass.