# Linear Static 3D Euler Beam Release Report

본 문서는 당시 revision의 검증·판정 기록이다. 본문에 남긴 원본 보고서 이름과 SHA-256은
통합 전 자료의 식별자이며 정리된 현재 파일의 byte hash를 뜻하지 않는다. 원문은 Git
`858e87b`의 해당 기능 폴더에서 확인할 수 있다. 현재 진입점과 대응 기록은 [README](README.md)를 따른다.

## Metadata

- feature_id: `linear-static-3d-euler-beam`
- approved_design: `docs/development-history.md` (`status: approved`; approved 2026-08-08, amended 2026-08-09)
- source_requirement: `docs/linear-static-3d-euler-beam/requirements.md`
- source_research: `docs/linear-static-3d-euler-beam/research.md`
- source_formulation: `docs/linear-static-3d-euler-beam/formulation.md`
- source_numerical_review: `docs/linear-static-3d-euler-beam/numerical-review.md`
- source_io_definition: `docs/linear-static-3d-euler-beam/io.md`
- source_reference_model: `docs/linear-static-3d-euler-beam/reference-model.md`
- source_implementation_plan: `docs/linear-static-3d-euler-beam/README.md`
- source_implementation_report: `docs/linear-static-3d-euler-beam/lessons.md`
- source_build_test_report: `docs/linear-static-3d-euler-beam/verification.md`
- source_reference_verification_report: `docs/linear-static-3d-euler-beam/verification.md`
- source_physics_evaluation_report: `docs/linear-static-3d-euler-beam/verification.md`
- audited_head: `822b06be3d2128d5dfdc5e394078abbb9dcd5a50`
- reference_model_id: `cantilever-beam-b33`
- reference_schema: `abaqus-cae-report-csv-v0`
- reference_baseline: `reference/cantilever beam/` at source commit `2b34d0b`
- historical_status: `ready-for-release`
- current_status: `superseded-pending-revalidation`
- superseded_on: `2026-08-18`
- date: `2026-08-10`
- final_review_source_head: `b7a1258ce0f36a85b888e23470cf9d936a7595cd`

The readiness evidence below is historical. The 2026-08-18 build/reference revalidation passed,
but fresh physics and release audits are still required before a current `ready-for-release`
verdict may be issued.

This is an internal feature-readiness verdict. It authorizes no publish, deploy, package, tag,
push, external release, or reference-artifact operation.

## Known Limitations

| limitation | category | user impact | disposition |
| --- | --- | --- | --- |
| Abaqus `TYPE=B31` / Timoshenko | element/input | rejected as `unsupported-element-formulation`; no shear-deformable beam behavior | documented, deferred feature |
| multiple analysis steps | analysis/input | a second `*STEP` is rejected; no step-to-step propagation | documented, deferred feature |
| instance transforms and nested/dependent assembly | model/input | translation/rotation and nested semantics are rejected | documented, deferred feature |
| `I12!=0` and section extensions | section/physics | coupled inertia, taper, offsets, releases, curved geometry, and warping are unsupported | documented, deferred feature |
| Abaqus `*DLOAD` | load/input | parser/CLI reject it; only the formulation-level constant local line-load kernel exists | documented, deferred feature |
| nonlinear/dynamic/contact/thermal | analysis/physics | no geometric/material nonlinearity, dynamics, contact, or thermal response | documented, deferred feature |
| shear and warping stress | output/physics | no transverse/torsional shear-stress or warping-stress recovery; no nodal averaging | documented, deferred feature |
| beam stress reference | verification | axial `S11` is mandatory and analytically/schema tested, but Abaqus stress reference is N/A | accepted contract N/A |
| approved four-file legacy exception | artifacts | spaces and legacy names remain; `metadata.json` is absent-allowed by project-wide policy, while `README.md` and stress CSV are N/A only for this bundle | read-only accepted filename/README exception; not precedent for new bundles |
| reference coverage | verification | single identity-axis local-z B33 cantilever does not itself cover axial/torsion/local-y/rotated/prescribed/line-load/nonzero-fiber stress | accepted; complementary analytical/unit portfolio passes |
| Euler-Bernoulli applicability | modeling | deep/short beams may be too stiff; no automatic slenderness threshold is approved | documented modeling limit |
| energy evidence | output | no HDF5 energy dataset; Step 27 derives positive `0.5*F^T*d` and uses rank/energy tests | accepted evidence limit |
| comparator file-type depth (Minor) | test evidence | test-only comparator pins float64 types but relies on writer self-check/full schema tests for exact uint64/compound/string file types | accepted defense-in-depth coverage limit |
| multi-source diagnostic order (Minor) | portability/future scope | sorter is sufficient for V0 single-input CLI but is not the future multi-source declaration/internal-ID ordering contract | accepted V0 limit |
| HDF5 `libmmd.dll` staging guard (Minor) | environment portability | unconditional guard is correct for approved shared-HDF5 environment; alternate HDF5 targets may need adjustment | accepted external portability limit |
| stale implementation aggregate header | documentation | top-level `in-progress` can confuse readers despite completed evidence | documented nonblocking stale header; upstream unchanged |

## Release Verdict

- verdict: `ready-for-release`
- status: `ready-for-release`
- reason: all required upstream gates are present and passing, Steps 0-27 are completed, all 44
  must requirements have complete acceptance/test/reference/disposition traceability, reference
  identity is unchanged, known limitations and accepted risks are documented, and no unresolved
  blocker exists.
- authority_boundary: internal feature readiness only; no publish, deploy, package, tag, push,
  external release, or reference-artifact change is authorized. Harness-owned phase evidence
  commits remain part of the internal development workflow, not release publication.

## Handoff Recommendation

| target_agent | reason | required input |
| --- | --- | --- |
| Coordinator Agent | Close the internal feature workflow with `ready-for-release`. | This report, exact three-gate reports, phase index Step 28 completion, and the documented authority boundary. |
| Correction Agent | N/A; no implementation-owned blocker exists. | N/A |
| Reference Verification Agent | N/A; required comparison passed. | N/A |
| Physics Evaluation Agent | N/A; required physics review passed. | N/A |

No release engineering, packaging, publication, tag, push, or external coordination was performed.
Harness/root phase-evidence commits are internal workflow records, not an external release action.

## Open Issues

- Blocking issues: none.
- Nonblocking documentation issue: the implementation report aggregate `status: in-progress` is
  stale; completed Step blocks, phase index, and Step 25 fresh audit are authoritative for release
  closure. It remains unchanged to preserve upstream audit independence.
- Resolved final-review finding: Step 26 now probes authoritative `passed=true`, and the exact
  acceptance command passes. The remaining Step 25 input-hash prose typo is nonblocking; later
  exact hashes and Git audits resolve identity without changing artifacts.
- Nonblocking accepted Minors: comparator file-type defense-in-depth coverage, future multi-source
  diagnostic ordering, and alternate-HDF5 `libmmd.dll` staging portability remain as documented.
- Deferred behavior is limited to the Known Limitations and is not claimed as supported.

현재 build·reference·물리 실행 기록은 [검증 보고서](verification.md)에 통합했다. 과거 readiness와 현재 재검증 필요를 구분하며 이 정리는 새로운 release 감사가 아니다.