Simulation Setup
- Vehicle: The vehicle is a SUT (Special Utility Truck) from the NHTSA database.
- Test Configuration: A 40 km/h (26 mph) frontal crash test with a rigid barrier impact, featuring:
- Full-size male and female Hybrid III dummies
- Impact at 45 degrees to the longitudinal axis of the vehicle
LS-DYNA Model
The LS-DYNA model was created using data from the NHTSA database. It includes:
- Mesh: A hybrid mesh consisting of shell elements for the outer skin, solid elements for structural components (e.g., seats), and tetrahedral elements for interior components.
- Material Models:
- Shell elements use a modified progressive damage model to simulate material failure
- Solid elements employ a rigid-plastic material model with strain rate effects
- Tetrahedral elements are assigned a viscoelastic material model
Simulation Results
The simulation results include:
- Deformation: The vehicle deforms significantly, particularly in the front end, due to the impact.
- Occupant Kinematics:
- The male dummy experiences head translation and rotation during the crash
- The female dummy also shows significant kinematic response
- Injury Criteria:
- Head Injury Criterion (HIC) values are calculated for both dummies
- Femur and tibia injuries are predicted using LS-DYNA's injury criteria
Key Observations
- Structural Response: The vehicle's structural components, such as the roof rail and B-pillar, exhibit significant plastic deformation during the crash.
- Occupant Kinematics: Both dummies experience complex kinematic responses, including head translation and rotation.
- Injury Prediction: LS-DYNA predicts injuries to both occupants based on their kinematic response.
Conclusion
The simulation results provide valuable insights into the structural response and occupant kinematics during a 40 km/h frontal crash test. The predicted injuries highlight areas for improvement in vehicle design to enhance occupant safety. |