---
license: odc-by
pretty_name: DeepJEB++
size_categories:
  - 10K<n<100K
tags:
  - engineering-design
  - finite-element-analysis
  - surrogate-modeling
  - 3d-geometry
  - jet-engine-bracket
---

> 📢 Update — v1.1 (2026-07)
> The torsional load moment is now applied about the Z-axis to match the
> SimJEB reference torsion condition (v1.0 applied it about the Y-axis), and
> `tor_maxvm` was added to the labels. Vertical / horizontal / diagonal loads,
> geometry, meshes and boundary conditions are unchanged.
> If you already downloaded v1.0, you do not need to re-download the full
> ~29 GB — apply the lightweight torsion patch (see [Usage](#usage)).

# 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
**ODC-By v1.0** (Open Data Commons Attribution License). Free to use, modify,
and share -- including for commercial purposes -- with attribution (please cite
the DeepJEB++ paper and the upstream SimJEB and DeepJEB datasets).
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`.

## Usage

### New users — full v1.1
```python
from huggingface_hub import snapshot_download
snapshot_download("KAIST-SmartDesignLab/DeepJEB-PP", repo_type="dataset",
                  local_dir="DeepJEB-PP")
```
Extract the `.tar.gz` archives, load fields with `numpy.load(...)` and scalars
from `deepjebpp_labels.csv`.

### Already have v1.0? Apply the torsion patch (no 29 GB re-download)
v1.1 changes **only the torsion labels** (moment axis Y -> Z to match the SimJEB
reference torsion condition) and adds `tor_maxvm`. Vertical / horizontal /
diagonal loads, geometry, meshes and boundary conditions are byte-identical to
v1.0. To update in place without re-downloading the full `3_fea_fields` (~29 GB):
```python
from huggingface_hub import hf_hub_download
# ~14 GB torsion-only patch instead of the full archive
hf_hub_download("KAIST-SmartDesignLab/DeepJEB-PP",
                "3_fea_fields_torsion_z_v1.1.tar.gz",
                repo_type="dataset", local_dir="patch")
hf_hub_download("KAIST-SmartDesignLab/DeepJEB-PP", "apply_torsion_patch.py",
                repo_type="dataset", local_dir="patch")
```
```bash
mkdir -p patch/torsion
tar -xzf patch/3_fea_fields_torsion_z_v1.1.tar.gz -C patch/torsion
python patch/apply_torsion_patch.py  <your 3_fea_fields dir>  patch/torsion
```
The script replaces `tor_U / tor_vm / tor_maxu / tor_p95vm` and adds
`tor_maxvm` in each `<case>.npz` (verifying `surface_points` match), leaving
the other loads untouched. Then also replace the small `deepjebpp_labels.csv`
and `metadata.json` with the v1.1 copies. See `PATCH_README.txt`.

### Pin a specific version
```python
snapshot_download("KAIST-SmartDesignLab/DeepJEB-PP", repo_type="dataset",
                  revision="v1.1")   # or "v1.0" for the original Y-axis torsion
```

## Load cases (Ti-6Al-4V, linear static)
vertical 35.6 kN | horizontal 37.8 kN | diagonal 42.3 kN | torsional 565 kN-mm

The **torsional** load is applied as a moment about the **Z-axis** `(0, 0, 1)`, matching the SimJEB reference torsion condition. (See Version history.)

## Version history
- **v1.1** (2026-07) - Torsional moment axis corrected from Y to **Z-axis** `(0,0,1)` to match the SimJEB reference torsion loading condition; `tor_maxvm` (full-volume max von Mises) added to `deepjebpp_labels.csv`. **Recommended version.**
- **v1.0** (2026-06) - Initial release; torsional moment applied about the Y-axis `(0,1,0)`. Retained via git tag for reproducibility of any prior results.

## Citation
Citation will be added upon publication (ASME Journal of Mechanical Design).