| # Simulation protocol |
|
|
| ## Scope |
|
|
| The three panel datasets use the same impactor construction, parameter bounds, |
| boundary-condition rule, contact definition, solver-output settings, and |
| compact-result conversion. Their panel meshes, eligible impact locations, |
| part identifiers, and LHS seeds differ. Equal case identifiers across |
| geometries are not paired simulations. |
|
|
| ## Units |
|
|
| The LS-DYNA models use the tonne--mm--s--N consistent unit system: |
|
|
| | Quantity | Unit | |
| |---|---| |
| | coordinate and displacement | mm | |
| | time | s | |
| | velocity | mm/s | |
| | mass | tonne | |
| | density | tonne/mm^3 | |
| | force | N | |
| | stress and Young's modulus | MPa | |
| | angle | degree | |
|
|
| ## Solver |
|
|
| Cases were run with LS-DYNA SMP single precision R12 using the `lsdyna_sp.exe` |
| distributed through ANSYS v221. The batch configuration used `ncpu=8` and |
| `memory=400m`. The exact R12 sub-build is not retained for every released case. |
| The termination time is 0.03 s. |
|
|
| ## Rigid spherical impactor |
|
|
| | Setting | Value | |
| |---|---| |
| | part ID | 9636 | |
| | section ID | 9636 | |
| | material ID | 174 | |
| | material model | `*MAT_RIGID` | |
| | element type | shell | |
| | shell formulation | ELFORM=2 | |
| | shear factor | SHRF=0.833333 | |
| | thickness integration | NIP=3 | |
| | shell thickness | 0.1 mm | |
| | sphere radius | 12.5 mm | |
| | initial gap | 5.0 mm | |
| | reference nominal mass | 0.01 tonne | |
| | reference density | 5.205e-5 tonne/mm^3 | |
|
|
| For impact target p and unit travel direction v_hat, the initial center is |
| `c_ball = p - v_hat * (12.5 mm + 5.0 mm)`. No initial angular velocity is |
| applied. The generator records `impactor_mass = 0.01 tonne * mu` and writes |
| `impactor_density = 5.205e-5 tonne/mm^3 * mu` into the rigid material. The |
| released `impactor_mass` should therefore be interpreted as the nominal mass |
| recorded by the generator. |
|
|
| The material category changes only the rigid impactor's E and nu: |
|
|
| | Index | Label | E (MPa) | nu | |
| |---:|---|---:|---:| |
| | 0 | `aluminum_rigid` | 70000 | 0.33 | |
| | 1 | `titanium_rigid` | 110000 | 0.34 | |
| | 2 | `steel_rigid` | 210000 | 0.30 | |
|
|
| ## Panel boundary and contact |
|
|
| Panel outer-boundary nodes are determined topologically: nodes belonging to a |
| shell edge used by only one panel element are included in the boundary set. |
| All six translational and rotational degrees of freedom in that set are fixed |
| using `*BOUNDARY_SPC_SET`. |
|
|
| The impactor and panel interact through |
| `*CONTACT_AUTOMATIC_SURFACE_TO_SURFACE_ID`. Static and dynamic friction |
| coefficients are both 0.15. A body acceleration of 9810 mm/s^2 is applied in |
| global +Z. |
|
|
| Panel materials and shell sections are retained from the cited upstream 2020 |
| Nissan Rogue Version 3 model. Their full keyword cards and the complete vehicle |
| model are not part of this compact release. |
|
|
| ## Outputs |
|
|
| D3PLOT output uses a nominal 0.0002-s interval. Nodal X/Y/Z displacement is |
| exported with LS-PrePost `ntime 5/6/7`. Shell effective stress is exported with |
| `etime 9`, labeled `Effective Stress (v-m), ip#max`. See |
| `TEMPORAL_SAMPLING.md` and the main Datasheet for the compact reduction and |
| stress semantics. |
|
|
| Representative self-contained keyword inputs and solver `d3hsp`/`matsum` |
| outputs were retained as audit material but are not distributed in the public |
| dataset. |
|
|
