Public evidence

mechanical.statics.plastic_moment

Machine-checked verification for calculation version 1.0.0 · tier engine_tested

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Verification

5/5 calculation tests · Production surface contract 6/6

Golden tests 2 / 2
Boundary tests 3 / 3
Property tests 0 / 0
Production surface contract 6 / 6
Engine tested Yes
Source checked Yes
Artifact integrity PASS
Production attestation Embedded snapshot: unpublished · Build schema 1.0.0 ready · Semantic contract ✓ · Attestation report not published on origin · Live production status STALE (8 capabilities; 189 remain CURRENT) @ 2026-09-23T21:48:15.717Z
Semantic contract PASS
Evidence attested at 2026-09-23T02:27:54.588Z
Last production check 2026-09-23T02:27:54.588Z
Public / cache —
Origin —
Supplemental domain review Not performed
Named expert review Not performed

release artifacts aligned PASS
schema output required declared PASS
schema valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input PASS
rest success payload validates schema PASS

Fingerprint sha256:8995d9c691a960bc261d46f9dee908fde1bc2f2a8af775d2d6bdb6738d038a10

Input schema sha256:f591158501975d56b9f8c74effb2346cca2e4e0ad23baa0ce07c2bd2017ffe48 · Output schema sha256:439227ed3103e58a52f2325683bf89ed74c547d57e5e7a393c305ef91f568640 · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Build & scope

Engine identity and declared limitations.

Tool: plastic-moment
Engine: plastic-moment
Engine build: 2026-09-23
Evidence core: 2026-09-23T21:25:13.013Z
Rendered: 2026-09-23T21:48:01.336Z
Last reviewed: —

Limitations

One centroidal axis
Mp = σ_y Z
Z is an input, not rebuilt from b and h
Not transverse shear

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

Hibbeler, Mechanics of Materials — Plastic deformation — plastic moment
Supports: The fully plastic moment on a centroidal axis is the yield stress times the plastic modulus of that axis.

Published checks

Golden, boundary, and property cases included in this evidence build.

ID	Kind	Status	Detail
`golden-rect`	golden	pass	Expected Mp=4500 · sigma_y=250 · Z=18 · model=plastic_moment · Actual model=plastic_moment · sigma_y=250 · Z=18 · Mp=4500 · solver=plastic moment · convention=Mp = σ_y Z on one centroidal axis. Z comes from a plastic-modulus page. This page does not rebuild the section. Transverse shear is its own page.
`golden-circle`	golden	pass	Expected Mp=2666.6666666666665 · Z=10.666666666666666 · Actual model=plastic_moment · sigma_y=250 · Z=10.666666666666666 · Mp=2666.6666666666665 · solver=plastic moment · convention=Mp = σ_y Z on one centroidal axis. Z comes from a plastic-modulus page. This page does not rebuild the section. Transverse shear is its own page.
`boundary-zero-yield`	boundary	pass	Expected VALUE_MUST_BE_POSITIVE · Actual VALUE_MUST_BE_POSITIVE
`boundary-zero-z`	boundary	pass	Expected VALUE_MUST_BE_POSITIVE · Actual VALUE_MUST_BE_POSITIVE
`boundary-missing`	boundary	pass	Expected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT