Frontal crash analysis of neon BIW model using Hypermesh and radioss
Frontal crash analysis of neon BIW model using Hypermesh and radioss
Objective:
Frontal crash-BIW
- Check unit system and either follow[Mg mm s] or [Kg mm ms].
- Create appropriate interface ,friction 0.2 and recommended parameters.
- Make sure of no penetrations and intersection.
- Correct rigid bodies if any issues.
- Create rigid wall with friction 0.1.
- Compare the model weight with the full scale 300k nodes model and use added masses to reach target weight 700kg while getting CG about the required range.
- Initial velocity 35 mph.
- Use model checker to ensure good quality.
- Time-step :0.5 to 0.1 microseconds.
- Run 80 ms.
Output requests:
- Sectional force in the rails at location of indicated node 174247.
- Axial force received on the rails from bumper.
- Shotgun cross sectional forces.
- A pillar cross section.
- Acceleration curve received on the accelerometer at base of B pillar (on B pillar rocker).
- Intrusions on the dash wall 66695,66244.
Procedure:
- Create Type 7 Contact Interface
- Check for penetration
- Rigid wall creation
Hourglass energy is almost zero which is good
- The model has initial weight of 180kg the masses are added at the base such that COG lies exactly lies in the center and total mass should not exceed 700kg
- And mass balancing is done using trial and error method
- Initial velocity
- Creating Cross Sections
- Create Two Intrusions
Intrusion at 66695 node no with referance to 121703 node no = 780-691=89mm (X-Axis)
Intrusion at 66244 node no with reference to 121995 node no = 806-656=150mm (X-Axix)
- Bumper and rails are the most important parts of the car because they absorb more maximum forces during the crash to reduce the force transmitted to driver seat
