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
1.4 KiB
JSON
31 lines
1.4 KiB
JSON
{
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"title": "Scordelis–Lo roof with shell elements",
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"kind": "benchmark",
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"source": "MacNeal and Harder, 'A proposed standard set of problems to test finite element accuracy', Finite Elements in Analysis and Design 1 (1985) 3–20, Fig. 8 (p. 8), Table 5(a) (p. 11); 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)",
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"quantities": [
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{
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"id": "uz",
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"quantity": "vertical displacement at the midpoint of the free edge, 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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16.069690242163,
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19.151111077974
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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": -0.3024,
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"tolerance": {
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"relative": 0.02
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},
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"reason": "MacNeal and Harder grade a thin-shell element within 2% of the theoretical value on a prescribed coarse mesh, the grading the sibling case scordelis-lo-roof-solid records (p. 14); this case uses 16 × 16, the mesh the solver's in-code gate test uses, and the flat MITC4 shell converges from below to the reference: 4 × 4, 8 × 8, 16 × 16, 32 × 32, 64 × 64 and 128 × 128 give 0.28459, 0.29401, 0.29901, 0.30060, 0.30118 and 0.30143, so 16 × 16 is 1.12% low and the mesh error shrinks monotonically inside the tolerance (README)"
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}
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]
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}
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