Public evidence

mechanical.statics.center_triangle_at_deflection

Machine-checked verification for calculation version 1.0.0 · tier engine_tested

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP status

Physics L1 gap capability

Declared partition coverage: PASS · 2/2 declared partitions (domain, invalid-domain)
Versions: Calculation 1.0.0 · CVP protocol 1.0.0-proposed
CVP identity: 0/0 property · digest 1902013aef1d

Verification

Legacy regression suite: 2/2 calculation tests · Production surface contract 6/6

Three distinct suites: educational examples on the calculator page, this legacy regression count (2/2 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

STALE · Build schema 1.0.0 ready · Semantic contract ✓ · Last attestation PASS · current evidence changed · re-attestation required · CVP STALE · attestation STALE — Production CURRENT withheld

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Calculation version 1.0.0. CVP 1.0.0-proposed. 1/1 golden · 1/1 CVP boundary · 1/1 invalid · 1/1 cross-interface · 6/6 CVP contract. digest 1902013aef1d.

Golden (oracle-backed) 1 / 1
CVP boundary 1 / 1
Invalid input 1 / 1
Cross-interface 1 / 1
CVP contract 6 / 6
Interfaces PASS · UI (SSR) / REST / MCP
Interface claim ui-ssr is query-result HTML, not a live browser session.
Assurance Engineering

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:f5651d2f63ffdeb2b0a433afa617cce243067124f371ed95b33531e5a3323f14

Input schema sha256:160af0deb6903ccef4fe5b661e5285a4ee55bef1e2a4529c0fdbec01eb788a3e · Output schema sha256:d0f321afe5b3968a45191984a9ebbc3a9fee86058ea4e600883e6e25965d56ee · 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: center-triangle-at
Engine: center-triangle-at
Engine build: 2026-09-24
Evidence core: 2026-09-24T22:59:42.914Z
Rendered: 2026-09-25T01:47:46.283Z
Last reviewed: —

Limitations

Peak at midspan
x is strictly inside the span
I is an input

Sources

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

Hibbeler, Mechanics of Materials — Deflection of beams — triangular load
Supports: A triangle peaking at midspan deflects w0 L⁴/(120 E I) there.
Gere and Goodno, Mechanics of Materials — Deflection of beams — symmetric triangular load
Supports: Supports the elastic curve measured from the left support, mirrored past midspan.

Legacy published checks

Golden and boundary cases from the legacy Evidence JSON. CVP property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the Manifest — including SKIP when a suite has no vectors.

ID	Kind	Status	Detail
`golden-mid`	golden	pass	Expected delta=3.2 · model=center_triangle_at_deflection · Actual delta=3.2 · model=center_triangle_at_deflection · w0=24 · x=1 · L=2 · E=1 · I=1 · solver=center-peaked triangle at a station
`boundary-support`	boundary	pass	Expected INVALID_INPUT · Actual INVALID_INPUT