| { |
| "license": "ODC-By v1.0", |
| "license_url": "https://opendatacommons.org/licenses/by/1-0/", |
| "dataset": "DeepJEB++ TRELLIS-generated jet-engine bracket surface-FEA dataset", |
| "version": "1.0", |
| "date": "2026-06-07", |
| "n_cases": 15360, |
| "case_id_format": "<base>-<sub>-diag_xz_mm_IS<aug> (shared by mesh / field / BC / label row)", |
| "units": { |
| "length": "mm", |
| "displacement": "mm", |
| "force": "N", |
| "moment": "N*mm", |
| "stress": "MPa", |
| "mass": "g", |
| "volume": "mm^3" |
| }, |
| "material": { |
| "name": "Ti-6Al-4V", |
| "model": "linear isotropic elasticity (static)", |
| "youngs_modulus_MPa": 113800.0, |
| "poisson_ratio": 0.342, |
| "density_g_per_mm3": 0.00443 |
| }, |
| "load_cases": [ |
| { |
| "name": "ver", |
| "type": "force", |
| "direction": [ |
| 0.0, |
| 0.0, |
| 1.0 |
| ], |
| "magnitude": 35600.0, |
| "unit": "N" |
| }, |
| { |
| "name": "hor", |
| "type": "force", |
| "direction": [ |
| -1.0, |
| 0.0, |
| 0.0 |
| ], |
| "magnitude": 37800.0, |
| "unit": "N" |
| }, |
| { |
| "name": "dia", |
| "type": "force", |
| "direction": [ |
| -0.669, |
| 0.0, |
| 0.743 |
| ], |
| "magnitude": 42300.0, |
| "unit": "N" |
| }, |
| { |
| "name": "tor", |
| "type": "moment", |
| "direction": [ |
| 0.0, |
| 1.0, |
| 0.0 |
| ], |
| "magnitude": 565000.0, |
| "unit": "N*mm" |
| } |
| ], |
| "boundary_conditions": { |
| "dirichlet": "4 bolt holes clamped (u = 0)", |
| "neumann": "total traction applied on the lug/clevis bore, shared equally over lug nodes", |
| "interface_detection": "deterministic 4-bolt + loaded-clevis detection (paper 3.4.1), Umeyama-registered to the GT frame", |
| "index_frame": "all BC node indices reference fields/<case>.npz surface_points (25k FEM mesh, ~24.9k verts), NOT the native 50k .obj" |
| }, |
| "mesh": { |
| "native_surface": "meshes ~50k verts (.obj), source output_v2/_tri", |
| "fem_surface": "decimated to FEM_TARGET_VERTS=25000, pymeshfix-cleaned", |
| "volume": "tetgen tetrahedralization, switches pq1.2/10Y", |
| "note_robust_6": "6 complex cases (187-384-IS06, 217-136-IS09, 384-123-IS00, 384-136-IS18, 384-279-IS13, 384-548-IS08) used a robust decimation (pymeshfix-before-decimate) to avoid tetgen self-intersection; same 25k target." |
| }, |
| "mass": { |
| "formula": "mass_g = density_g_per_mm3 * enclosed_volume_mm3", |
| "volume_source": "pymeshfix-watertight enclosed volume of the registered native ~50k mesh (full resolution; more accurate than the 25k FEM tet volume)", |
| "stats_g": { |
| "min": 83.6, |
| "median": 233.2, |
| "max": 1500.7 |
| } |
| }, |
| "layout": { |
| "1_surface_meshes/": "15,360 input surface meshes (.obj, native ~50k verts)", |
| "2_boundary_conditions/": "15,360 BC (.npz): bolt_idx, bolt_holes(0-3), lug_idx, n_surface, R, jaccard_bolt, frame", |
| "3_fea_fields/": "15,360 surface FEA fields (.npz): surface_points, surface_faces, R, cov_min, dXZ, and per load {ver,hor,dia,tor}_U, _vm, _maxu, _p95vm", |
| "deepjebpp_labels.csv": "per-case scalar labels (15,360 rows): case, mass_g, vol_mm3, cov_min, dXZ, R, {load}_maxu, {load}_p95vm, {load}_maxvm", |
| "metadata.json": "this file", |
| "README.txt": "human-readable spec" |
| }, |
| "field_npz_keys": { |
| "surface_points": "(N,3) float32 mm", |
| "surface_faces": "(M,3) int32", |
| "R": "float lug bore radius mm", |
| "cov_min": "float lug-detection diagnostic", |
| "dXZ": "float lug-detection diagnostic", |
| "<load>_U": "(N,3) float32 surface displacement mm", |
| "<load>_vm": "(N,) float32 surface von Mises MPa", |
| "<load>_maxu": "float max displacement magnitude over volume mm", |
| "<load>_p95vm": "float 95th-percentile von Mises over volume nodes MPa" |
| }, |
| "notes": { |
| "mass_vs_cad_validation": "The paper's 'R^2=0.9999 vs CAD' mass validation refers to the volume->mass pipeline checked against CAD reference masses (SimJEB GT, which has CAD). Generated TRELLIS brackets have no CAD counterpart, so that validation is not reproduced per-case here; the same deterministic volume pipeline is used.", |
| "all_at_25k": "All 15,360 field/BC entries are at the same 25k FEM mesh density (consistent labels)." |
| } |
| } |
