forked from 1b-agent/fieldcraft-upstream
jyvikoandClaude Opus 5.5
6bd52c0b29
file.sample crank-arm: a 170 mm 6061-T6 crank built in SolidCraft (crates/engine/samples/crank-arm.json), swept along z by mesh.hex.generate as 7274 hex20 elements of 3 mm (scaled Jacobian min 0.17). The hex variant drops the pocket floor fillet and boss chamfers, and its root arcs meet the bosses 20 degrees off tangent so the arm's top face has no zero-angle cusp. The square bore is fixed and 1500 N acts on the pedal hole; the faces are picked by their surfaces, not their names. Its heavy test matches the root bending stress to M/Z = 62.6 MPa within 3 % (0.3 % in practice). Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo
140 lines
10 KiB
Markdown
140 lines
10 KiB
Markdown
# FieldCraft
|
||
|
||
An open-source, clean-room CAE application in pure Rust: from a parametric SolidCraft part to a
|
||
verified finite element analysis, with tetrahedral and hexahedral meshing, its own implicit,
|
||
explicit, thermal and lattice Boltzmann solvers, and decks for Abaqus, Nastran and LS-DYNA. The
|
||
desktop app, the command line and AI agents (over MCP) drive the same commands.
|
||
|
||
**Status:** early but working end to end — open a part, mesh it, define the analysis, solve,
|
||
see the results — with a nonlinear implicit solver (large deformation, plasticity, rubber) now
|
||
in place. Hex meshing is the centre of gravity. Next: buckling and arc-length, contact, then
|
||
the wider material and multiphysics library. See [ROADMAP.md](ROADMAP.md).
|
||
**Want to help?** Pick an issue labelled
|
||
[good first issue](https://github.com/jyviko/fieldcraft/labels/good%20first%20issue) or
|
||
[help wanted](https://github.com/jyviko/fieldcraft/labels/help%20wanted) and read
|
||
[CONTRIBUTING.md](CONTRIBUTING.md).
|
||
|
||
|
||
|
||
*Claude driving FieldCraft through its [MCP server](docs/mcp.md): one prompt, and it opens the part, meshes it, defines and solves the analysis, then checks the tip deflection against beam theory. Real session, waits shortened. [Full video](docs/media/claude-mcp.mp4).*
|
||
|
||
|
||
|
||
An AI agent drives FieldCraft over [MCP](docs/mcp.md), each stage captioned with the tool it
|
||
calls: it opens an I-beam, hex meshes it, defines the material, the clamp and a 1000 N tip load,
|
||
solves, and shows the von Mises stress and the deformed shape (tip deflection 0.176 mm; beam
|
||
theory with shear 0.177 mm).
|
||
[MP4](docs/media/ibeam-analysis.mp4) · regenerated by [tools/demo-video](tools/demo-video/README.md).
|
||
|
||
## Download
|
||
|
||
[](https://github.com/jyviko/fieldcraft/releases/latest)
|
||
[](https://github.com/jyviko/fieldcraft/releases/latest)
|
||
[](https://github.com/jyviko/fieldcraft/releases/latest)
|
||
[](https://jyviko.github.io/fieldcraft/)
|
||
|
||
- **macOS:** open the `.dmg` and drag FieldCraft into Applications (Apple silicon and Intel).
|
||
- **Windows:** unzip and run `fieldcraft.exe`.
|
||
- **Linux:** the `.AppImage` (allow it to run as a program), or the `.tar.gz`.
|
||
- **Browser:** [try it at jyviko.github.io/fieldcraft](https://jyviko.github.io/fieldcraft/), no install.
|
||
- **Command line:** `fieldcraft-cli` ships in every package; AI agents connect to it over MCP
|
||
([docs/mcp.md](docs/mcp.md)).
|
||
|
||
Every release lists its checksums in `SHA256SUMS.txt`. Building from source is in
|
||
[CONTRIBUTING.md](CONTRIBUTING.md#get-it-running-about-10-minutes-on-a-fast-machine).
|
||
|
||
## Hex meshing a part that does not sweep
|
||
|
||
A filleted L-bracket with a hole through each leg cannot be swept in one piece. Split into 30
|
||
cells in SolidCraft, FieldCraft meshes it all-hex as one conforming mesh — O-grids round the holes,
|
||
graded through the fillet — and its hex20 tip deflection matches a fine tet10 solution to 0.1 %.
|
||
The same part also meshes all-hex automatically with the octree mesher (`mesh.hex.octree`).
|
||
|
||
| Cells | Conforming hex mesh | Von Mises (clamp and load drawn) |
|
||
|---|---|---|
|
||
|  |  |  |
|
||
|
||
## What it does today
|
||
|
||
- **Geometry in:** SolidCraft designs (`.solidcraft`) with persistent face, edge and body names,
|
||
and face-tagged 3MF meshes; surface checks (weld, manifold, orientation, self-intersection).
|
||
- **Meshing:** constrained Delaunay tetrahedra (tet4, tet10) with exact predicates and a
|
||
certified validity gate; Delaunay refinement, smoothing and sliver removal; structured hex by
|
||
sweeping, revolving and mapping (hex8, hex20), and conforming multi-block hex across a part
|
||
split into cells (`mesh.hex.blocks`); unstructured octree all-hex for any part
|
||
(`mesh.hex.octree`); 2D quad and tri meshes; quality metrics per element and set.
|
||
- **Elements:** solids (tet4, tet10, wedge6, hex8 with incompatible modes, hex20 full and
|
||
reduced, hybrid u–p for near-incompressible materials), plane stress, plane strain and
|
||
axisymmetric, trusses, Timoshenko beams, MITC3/MITC4 shells, springs, dashpots and point masses.
|
||
- **Model:** sets bound to geometry names, so they survive remeshing; isotropic and orthotropic
|
||
elasticity, J2 plasticity (isotropic and kinematic hardening, Johnson–Cook), Johnson–Cook
|
||
damage, neo-Hookean, Mooney–Rivlin and Yeoh hyperelasticity, thermal properties; fixed, displacement,
|
||
symmetry and temperature conditions; forces, moments, pressure, gravity, centrifugal and heat
|
||
loads; reference points with kinematic and distributing couplings; undo, redo and a
|
||
text-diffable `.fieldcraft` file.
|
||
- **Solvers:** linear static and frequency (supernodal Cholesky, block Lanczos); nonlinear static
|
||
by Newton–Raphson with automatic increments — large deformation (total Lagrangian) on every
|
||
solid element, follower pressure, finite- and small-strain plasticity sharing one return map
|
||
with the explicit solver, rubber and thermal strain, with measured quadratic convergence; steady and
|
||
transient heat transfer and coupled thermal stress; explicit dynamics with plasticity, damage,
|
||
erosion and rigid walls; D3Q19 lattice Boltzmann flow with forces on the part's faces. Results
|
||
never depend on the thread count.
|
||
- **Decks:** Abaqus, Nastran and LS-DYNA writers, each refusing by name what it cannot express.
|
||
- **Results:** contours of stress, strain and displacement with a legend, deformed shapes, mode
|
||
shapes, explicit and nonlinear frames, probes and reaction sums; supports, loads, reference
|
||
points and couplings drawn in the viewport.
|
||
- **Verification:** every capability is checked against closed forms and published benchmarks
|
||
(NAFEMS, MacNeal–Harder, Scordelis–Lo, the elastica, Hill's plastic cylinder, Rivlin's tube) in [`tests/oracle`](tests/oracle), with results frozen
|
||
so they cannot drift: 170 of 176 quantities pass in 50 cases, the 6 others documented known
|
||
failures ([docs/oracle.md](docs/oracle.md)).
|
||
- **Driving it:** a desktop app in the Craft family's layout, a CLI, a JSON control channel and an
|
||
MCP server; every capability is a command ([docs/features.md](docs/features.md)).
|
||
|
||
|
||
|
||
## Examples
|
||
|
||
Ready-to-solve samples: open one from **File ▸ Samples** (or the start screen), or start the app
|
||
with `fieldcraft --sample NAME`, and press **Solve**. Each opens and solves within half a minute and is checked
|
||
against a closed form or a reference solution ([docs/examples.md](docs/examples.md)).
|
||
|
||
| | | |
|
||
|---|---|---|
|
||
|  |  |  |
|
||
| **Drop test** (`drop-test`): an aluminium bracket dropped 2 m onto a tilted floor; explicit dynamics, the strike's stress waves | **Rubber seal** (`rubber-seal`): a Mooney–Rivlin gasket ring squeezed 25 %; nonlinear static, large strain | **Heated bracket** (`heated-bracket`): a clamped steel bracket heated at one end; steady heat and thermal stress |
|
||
|  | *No picture yet: the viewport does not draw flow results (M12).* |  |
|
||
| **Hex-meshed bracket** (`bracket-hex`): the bracket split into 30 cells, meshed all-hex (hex20), von Mises | **Flow past a bracket** (`flow-past`): air past an L-bracket on the floor; lattice Boltzmann flow, the drag and the force on each face | **Bicycle crank arm** (`crank-arm`): an aluminium crank swept all-hex (hex20), a rider's weight on the pedal; root bending within 0.3 % of M/Z |
|
||
|
||
## Build
|
||
|
||
```sh
|
||
cargo xtask ci # fmt, assets, licences, layers, clippy, tests, wasm
|
||
cargo xtask test --heavy # the heavy (ignored) tests and the doc tests
|
||
cargo run -p fieldcraft-cli -- commands # every command and its parameters
|
||
cargo run -p fieldcraft-cli -- run script.json # run a command script
|
||
cargo run -p fieldcraft-cli -- mcp # MCP server on stdio for AI agents (docs/mcp.md)
|
||
```
|
||
|
||
Rust 1.95 or later, with the `wasm32-unknown-unknown` target for `cargo xtask ci`.
|
||
|
||
## Documentation
|
||
|
||
- [Examples](docs/examples.md): the ready-to-solve samples and their checks
|
||
- [Architecture](docs/architecture.md): crates, layers and the meshing pipeline
|
||
- [Element library](docs/elements.md) and [verification and validation](docs/verification.md)
|
||
- [Capability checklist](docs/parity.md) and [roadmap](ROADMAP.md)
|
||
- [Libraries and licences](docs/adr/0001-libraries.md)
|
||
- [AI agents (MCP)](docs/mcp.md): `claude mcp add fieldcraft -- /path/to/fieldcraft-cli mcp`
|
||
- [Control protocol](docs/control-protocol.md): driving the desktop app
|
||
- [Releasing](docs/releasing.md): how a release is built, verified and published
|
||
- [Contributing](CONTRIBUTING.md) and [agent instructions](AGENTS.md)
|
||
|
||
## License
|
||
|
||
Dual-licensed under [MIT](LICENSE-MIT) or [Apache-2.0](LICENSE-APACHE), at your option. Notices
|
||
are in [NOTICE](NOTICE); third-party licences in [THIRD-PARTY-LICENSES.txt](THIRD-PARTY-LICENSES.txt).
|
||
|
||
FieldCraft is an independent project, not affiliated with, sponsored or endorsed by Dassault
|
||
Systèmes, MSC Software, Siemens or Ansys. Abaqus, Nastran, MSC Nastran, Simcenter Nastran and
|
||
LS-DYNA are trademarks of their owners and are named only to describe file compatibility.
|