forked from 1b-agent/fieldcraft-upstream
Erkin Alp Güney
18be60672b
The Scordelis-Lo roof and the pinched cylinder had their published references cited but no recipe, because mesh.block's 2D form is planar and cannot build a curved patch. Both are now active: the mesh is written node by node (mesh.node.add / mesh.element.add, the route docs/verification.md allows), the same cylinder patch the solver's own benchmarks.rs builds in code, with the quarter/eighth symmetry planes, the rigid diaphragm and the published load. - scordelis-lo-roof-shell: 16x16 flat quad4 (MITC4) shells, R = 25, t = 0.25, self-weight 90 per area; u_z at the free-edge mid-span -0.3024 within 2% (ours -0.29901009815961804, 1.12% low). - pinched-cylinder: 32x32 flat quad4 shells, R = 300, t = 3, a quarter of the unit pinch; u under the load -1.8248e-5 within 2% (ours -1.803845342860719e-05, 1.15% low). Each README carries the generator (so the recipe is reproducible), the refinement study the tolerance reason cites, and how the reference was cited before. pinched-hemisphere and mh-twisted-beam now say what they actually wait for: a doubly curved or helical shell mesh written node by node, not missing shell elements.
31 lines
1.5 KiB
JSON
31 lines
1.5 KiB
JSON
{
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"title": "Pinched cylinder with rigid diaphragms",
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"kind": "benchmark",
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"source": "Belytschko, Stolarski, Liu, Carpenter and Ong, 'Stress projection for membrane and shear locking in shell finite elements', Computer Methods in Applied Mechanics and Engineering 51 (1985) 221–258 (the shell obstacle course); reference 1.8248 × 10⁻⁵ under the load",
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"quantities": [
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{
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"id": "u",
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"quantity": "radial displacement under the load, mid-surface",
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"measure": {
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"command": "solve.probe",
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"params": {
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"step": "Load",
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"at": [
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[
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0,
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0,
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300
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]
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]
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},
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"pointer": "/nodes/0/displacement/2"
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},
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"value": -1.8248e-05,
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"tolerance": {
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"relative": 0.02
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},
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"reason": "a fixed-mesh comparison at the conventional 32 × 32 eighth mesh, the mesh the solver's own in-code benchmark uses: the reference is the thin-shell value Belytschko et al. quote to four figures (1.8248 × 10⁻⁵), while the deflection under a point load has no mesh-converged limit in a Reissner–Mindlin (MITC4) shell, whose transverse shear force is unbounded at the load, so the value keeps rising with refinement (8 × 8, 16 × 16, 24 × 24, 32 × 32, 48 × 48 and 64 × 64 give 1.3559, 1.6942, 1.7735, 1.8038, 1.8275 and 1.8369 × 10⁻⁵, crossing the reference between 32 × 32 and 48 × 48 and staying above it); 2% is the margin the in-code benchmark gates 32 × 32 with, applied here to the same mesh (crates/solver/tests/benchmarks.rs, README)"
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}
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]
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}
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