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.