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| TRELLIS-generated Jet-Engine Bracket — Surface FEA Dataset (DeepJEB++) |
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| Generated: 2026-06-07 |
| Source compute: FEA host .85 (143.248.221.85) |
| Cases: 15,360 deployable TRELLIS-generated brackets (deployable_final.txt) |
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| FOLDER LAYOUT |
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| trellis_fea_dataset/ |
| 1_surface_meshes/ 15,360 input surface meshes (.obj), native ~50k verts |
| (source: output_v2/_tri) |
| 2_boundary_conditions/ 15,360 per-case BC (.npz): clamped bolt + loaded lug nodes |
| 3_fea_fields/ 15,360 per-case surface FEA fields (.npz) |
| deepjebpp_labels.csv per-case SCALAR labels incl. mass (15,360 rows) |
| metadata.json machine-readable dataset spec (material/loads/units/schema) |
| README.txt this file |
| trellis_fea_percase.csv legacy labels WITHOUT mass (superseded by deepjebpp_labels.csv) |
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| File naming: <case>.obj / <case>.npz, e.g. 012-015-diag_xz_mm_IS02 |
| (mesh, BC npz, field npz, and label CSV row share the same <case> id.) |
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| FEM SETUP (linear elasticity, static) |
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| Material: E = 113800 MPa, nu = 0.342 (isotropic) |
| Units: length mm, force N, moment N*mm, stress MPa, displacement mm |
| Mesh: surface decimated to FEM_TARGET_VERTS = 25000, cleaned (pymeshfix), |
| volume tetrahedralized with tetgen switches "pq1.2/10Y" |
| BC: 4 bolt holes clamped (Dirichlet), load applied on the lug |
| (bolt/lug auto-detected + registered per case) |
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| 4 LOAD CASES (name, type, direction, magnitude): |
| ver force ( 0.000, 0.0, 1.000) 35,600 N |
| hor force (-1.000, 0.0, 0.000) 37,800 N |
| dia force (-0.669, 0.0, 0.743) 42,300 N |
| tor moment ( 0.000, 1.0, 0.000) 565,000 N*mm |
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| FIELD NPZ CONTENTS (numpy .npz, np.load) |
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| Geometry (shared by all 4 loads): |
| surface_points (N,3) float32 surface vertex coords (mm) |
| surface_faces (M,3) int32 triangle indices |
| R float detected lug bore radius (mm) |
| cov_min, dXZ float lug-detection diagnostics |
| Per load L in {ver, hor, dia, tor}: |
| L_U (N,3) float32 surface displacement vector (mm) [for deformed viz] |
| L_vm (N,) float32 surface von Mises stress (MPa) |
| L_maxu float max displacement magnitude over the volume (mm) |
| L_p95vm float 95th-percentile von Mises over volume nodes (MPa) |
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| BOUNDARY CONDITION NPZ CONTENTS (2_boundary_conditions/<case>.npz) |
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| *** ALL indices are into the npz surface_points array of 3_fea_fields/<case>.npz *** |
| *** (the 25k FEM surface mesh, ~24.9k verts) — NOT the native 50k meshes/.obj. *** |
| bolt_idx (B,) int32 clamped (Dirichlet) surface nodes = the 4 bolt holes |
| bolt_holes (B,) int8 hole label 0..3 for each bolt_idx node (spatial k=4; |
| a few cases may show 3 labels if two holes merge) |
| lug_idx (L,) int32 loaded (Neumann) surface nodes on the lug/clevis bore |
| (same load nodes shared by all 4 load cases) |
| n_surface int32 number of surface_points (sanity vs fields npz) |
| R float32 lug bore radius (mm) |
| jaccard_bolt float32 QC: agreement of re-detected vs U==0 bolt set (~1.0) |
| frame str "surface_points (mm, 25k FEM mesh); same index as 3_fea_fields/<case>.npz" |
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| Provenance: |
| - bolt_idx recovered EXACTLY from the solved fields: nodes with U==0 in ALL 4 |
| load cases (the Dirichlet-clamped set the solver actually fixed). |
| - lug_idx re-detected with the deterministic §3.4.1 bolt/lug pipeline |
| (trellis_local.prep) and mapped to surface_points via nearest-neighbour -- |
| the same mapping fem_solver_nf uses; verified against the U==0 bolt set |
| (mean Jaccard 0.9997 over all 15,360). |
| Usage example: |
| bc = np.load("2_boundary_conditions/<case>.npz") |
| fp = np.load("3_fea_fields/<case>.npz")["surface_points"] |
| clamped_xyz = fp[bc["bolt_idx"]] # mm coords of clamped bolt nodes |
| loaded_xyz = fp[bc["lug_idx"]] # mm coords of loaded lug nodes |
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| SCALAR LABEL COLUMNS (deepjebpp_labels.csv) |
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| case, mass_g, vol_mm3, cov_min, dXZ, R, |
| ver_maxu, ver_p95vm, ver_maxvm, |
| hor_maxu, hor_p95vm, hor_maxvm, |
| dia_maxu, dia_p95vm, dia_maxvm, |
| tor_maxu, tor_p95vm, tor_maxvm |
| - mass_g = mass (Ti-6Al-4V, rho=4.43e-3 g/mm^3) x enclosed volume of the |
| registered native ~50k mesh (full-resolution, pymeshfix-watertight). |
| - vol_mm3 = that enclosed volume (mm^3). |
| - The 3_fea_fields npz store maxu/p95vm; the CSV additionally has maxvm = max von Mises. |
| (trellis_fea_percase.csv is the same table WITHOUT mass_g/vol_mm3 — superseded.) |
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| NOTES |
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| * All 15,360 fields are at the SAME 25k mesh density (consistent labels). |
| * 6 geometrically complex cases failed the standard 25k decimation (self- |
| intersecting facets -> tetgen reject). They were re-solved with a robust |
| decimation (pymeshfix-clean the original BEFORE decimating; same 25k target |
| and same tetgen switches). Their scalars match the CSV within ~0.1-18% |
| (vs +30-170% if solved at 200k), so they remain on the 25k scale: |
| 187-384-diag_xz_mm_IS06, 217-136-diag_xz_mm_IS09, 384-123-diag_xz_mm_IS00, |
| 384-136-diag_xz_mm_IS18, 384-279-diag_xz_mm_IS13, 384-548-diag_xz_mm_IS08 |
| * Field npz store surface (boundary) values; max/p95 scalars are over the full |
| volume mesh. |
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| LICENSE |
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| This dataset is distributed under the Open Data Commons Attribution |
| License (ODC-By) v1.0. See the LICENSE file. |
| Free to use, modify, and share -- including commercially -- with attribution |
| (please cite the DeepJEB++ paper and the upstream SimJEB and DeepJEB datasets). |
| https://opendatacommons.org/licenses/by/1-0/ |
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