forked from 1b-agent/fieldcraft-upstream
jyvikoandClaude Opus 5.5
6d9452ad84
The oracle binary (modelcraft-testkit) runs each case's recipe through the command engine, measures its quantities by JSON pointers into step outputs or commands, compares them with the cited references and the frozen fixtures, and writes docs/oracle.md. 20 theory cases (patch tests of every solid element, Timoshenko cantilevers, Lame, Kirsch, beam frequencies, torsion and bending through couplings, explicit waves and impact, CDT invariants), 8 published benchmarks (MacNeal-Harder patch, straight and curved cantilevers, thick cylinder, Scordelis-Lo with solids, NAFEMS LE1, LE10, FV32) and 10 pending cases with citations. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm
44 lines
1.3 KiB
JSON
44 lines
1.3 KiB
JSON
{
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"title": "Torsion of a tube through a kinematically coupled reference point",
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"kind": "theory",
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"source": "Saint-Venant torsion of a circular tube, φ = TL/(GJ), τ = Tr/J with J = π(b⁴ − a⁴)/2; Timoshenko and Goodier, Theory of Elasticity, 3rd ed., 1970, §104",
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"quantities": [
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{
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"id": "twist",
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"quantity": "rotation of the reference point about z",
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"measure": {
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"from": "solve",
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"pointer": "/reference_points/0/displacement/5"
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},
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"value": 0.05607084715974633,
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"tolerance": {
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"relative": 0.005
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},
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"reason": "Saint-Venant torsion of a circular tube is exact in elasticity; the rigid end coupling only stiffens a short zone near the tip; quadratic elements with 16 divisions around are within 0.1%"
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},
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{
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"id": "shear",
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"quantity": "surface shear stress τ_θz = σ_yz at (10, 0, 20)",
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"measure": {
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"command": "solve.probe",
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"params": {
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"step": "Twist",
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"at": [
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[
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10.0,
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0,
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20.0
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]
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]
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},
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"pointer": "/nodes/0/stress/5"
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},
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"value": 1078.285522302814,
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"tolerance": {
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"relative": 0.01
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},
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"reason": "stress extrapolated to the outer surface and averaged where two blocks meet: about 0.3% with four radial quadratic elements (two gave 1.1%)"
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}
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]
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}
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