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Root cause: walls at z=±0.0092 were INSIDE the disk (particles extend
to z=±0.010), causing massive wall-particle overlap and immediate crash
in the Hertz-Mindlin contact force ("Over 100 excessive overlaps").
Changes:
- Move platens to z=±0.01005 (50 µm outside disk surface)
- Reduce bond stiffness to k_n=1e5 N/m (compatible with auto-computed
Rayleigh timestep ~2.9e-6 s; Verlet limit ~7.2e-6 s)
- Simplify to single-stage (FIRE unnecessary since hex lattice has zero
overlap)
- Add plot.py for load-displacement and bond breakage visualization
- Add README.md documenting physics, parameters, and how to run
Known issue: particles show KE=0 throughout loading, suggesting a force
accumulation ordering problem (wall_contact_force may run before
hertz_mindlin_contact which zeros forces). Needs investigation of the
Force schedule system ordering in dem_wall vs dem_granular.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
bench_brazilian_diskexample: bonded particle Brazilian disk (indirect tensile) testTest plan
cargo test --no-default-featurescargo clippy --no-default-features -- -D warningscargo run --release --example bench_brazilian_disk -- examples/bench_brazilian_disk/config.tomlpython3 examples/bench_brazilian_disk/validate.py🤖 Generated with Claude Code