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LICENSE

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+DeepJEB++ Dataset - License
+===========================
+Copyright (c) 2026 The DeepJEB++ Authors (KAIST).
+
+This dataset (surface meshes, boundary conditions, FEA fields, scalar labels,
+mass, and metadata) is licensed under the Creative Commons
+Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
+
+You are free to share and adapt the material for NON-COMMERCIAL purposes,
+provided you give appropriate credit (please cite the DeepJEB++ paper).
+
+  Human-readable summary: https://creativecommons.org/licenses/by-nc/4.0/
+  Full legal code:        https://creativecommons.org/licenses/by-nc/4.0/legalcode
+
+The foundation models used to generate the geometries (TRELLIS, Stable
+Diffusion v1.5) remain governed by their own respective licenses.

README.md

@@ -0,0 +1,43 @@
+---
+license: cc-by-nc-4.0
+pretty_name: DeepJEB++
+size_categories:
+  - 10K<n<100K
+tags:
+  - engineering-design
+  - finite-element-analysis
+  - surrogate-modeling
+  - 3d-geometry
+  - jet-engine-bracket
+---
+
+# DeepJEB++
+
+A foundation-model-driven 2D-to-3D data-augmentation dataset for structural
+engineering design. **15,360** simulation-labeled jet-engine brackets, generated
+by adapting Stable Diffusion v1.5 and TRELLIS, each paired with automatically
+computed linear-elastic finite-element labels under four load cases.
+
+## License
+**CC BY-NC 4.0** (Creative Commons Attribution-NonCommercial 4.0 International).
+Non-commercial use only; attribution required (please cite the DeepJEB++ paper).
+See the `LICENSE` file.
+
+## Contents
+| Path | Description |
+|------|-------------|
+| `1_surface_meshes/` | 15,360 surface meshes (`.obj`, native ~50k verts) |
+| `2_boundary_conditions/` | Four-bolt + loaded-clevis interfaces (vertex indices, mm frame) |
+| `3_fea_fields/` | Per-case surface FEA fields (`.npz`): displacement `U`, von Mises `vm` for 4 loads |
+| `deepjebpp_labels.csv` | Scalar labels: mass, per-load max displacement & 95th-pct von Mises |
+| `metadata.json` | Material, load cases, units, layout |
+| `README.txt` | Full human-readable specification |
+
+All field/BC entries are at a consistent 25k FEM-mesh density. BC node indices
+reference `3_fea_fields/<case>.npz` `surface_points` (25k), not the native `.obj`.
+
+## Load cases (Ti-6Al-4V, linear static)
+vertical 35.6 kN | horizontal 37.8 kN | diagonal 42.3 kN | torsional 565 kN-mm
+
+## Citation
+Citation will be added upon publication (ASME Journal of Mechanical Design).

README.txt

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+================================================================================
+ TRELLIS-generated Jet-Engine Bracket — Surface FEA Dataset (DeepJEB++)
+================================================================================
+Generated: 2026-06-07
+Source compute: FEA host .85 (143.248.221.85)
+Cases: 15,360 deployable TRELLIS-generated brackets (deployable_final.txt)
+
+--------------------------------------------------------------------------------
+FOLDER LAYOUT
+--------------------------------------------------------------------------------
+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)
+
+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.)
+
+--------------------------------------------------------------------------------
+FEM SETUP (linear elasticity, static)
+--------------------------------------------------------------------------------
+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)
+
+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
+
+--------------------------------------------------------------------------------
+FIELD NPZ CONTENTS  (numpy .npz, np.load)
+--------------------------------------------------------------------------------
+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)
+
+--------------------------------------------------------------------------------
+BOUNDARY CONDITION NPZ CONTENTS  (2_boundary_conditions/<case>.npz)
+--------------------------------------------------------------------------------
+*** 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"
+
+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
+
+--------------------------------------------------------------------------------
+SCALAR LABEL COLUMNS (deepjebpp_labels.csv)
+--------------------------------------------------------------------------------
+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.)
+
+--------------------------------------------------------------------------------
+NOTES
+--------------------------------------------------------------------------------
+* 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.
+================================================================================
+
+--------------------------------------------------------------------------------
+LICENSE
+--------------------------------------------------------------------------------
+This dataset is distributed under CC BY-NC 4.0 (Creative Commons
+Attribution-NonCommercial 4.0 International). See the LICENSE file.
+Non-commercial use only; attribution (cite the DeepJEB++ paper) required.
+https://creativecommons.org/licenses/by-nc/4.0/

metadata.json

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+{
+  "license": "CC BY-NC 4.0",
+  "license_url": "https://creativecommons.org/licenses/by-nc/4.0/",
+  "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)."
+  }
+}