Assignment 7-Side Pole Crash Simulation Challenge
- Check unit system and either follow [Mg mm s] or [Kg mm ms].
Opening the BEGIN CARD. The unit used in model is specified.
- Create appropriate interface ,friction 0.2 and recommended parameters.
- Make sure of no penetration and intersections.
- Create rigid wall with friction 0.1 as per referance model.
- Compare the model weight with the referance model and use added masses to reach target weight 700kg while getting CG about the required range.
Right clicking on the added mass-> create new selecting type 1
selecting the nodes on which the masse where to be added. the highlighted nodes are the ones on which the masses was added. weights were added to 4396 nodes and a individual weight of 534.3 was added, which added upto the car having a total weight of 700kg.
the cog of the car is a very important parameter. in this the assignment only the x-y orientation of the cog is important and height of the cog doesnt matter.
- Initial velocity as shown in picture.
- Use model checker to ensure good quality.
- Timestep :0.5 to 0.1 microseconds.
Running the simulation
section 2 has a more direct impact with the rigid wall due to which section 2 experiences more forces than crosss section 1
the impact starts around 10ms mark as we can see the forces start to increase from that point.
by 30ms mark more of the surfaces of the car comes in contact with the rigid wall. which causes the forces to reach its peak value.
due to the self penetration of the elements the forces never recedes for the rest of the simulation.
for the section 1 the forces involved are lesser than the forces involved in section 2 as the impact is little offsetted for section 1
we can see that many jerks have been experienced in the section area
the intrusion reaches a length of 386.786mm by the end of the simulation which is of medium severity.
the intrusion reaches a length of 305.698mm
the intrusion reaches a length of 1011.13mm which is very high and can cause a very severe injury.
the initial velocity of the car is 15.6464m/s. the velocity of the car decreases rapidly after the impact as the rigid wall basically acts as apply complete brake. At 10.5ms the velocity of the car starts to decreases as the car impacted with the rigid wall. the peak velocity reached is16.3628m/s
| No of Cycles | 80000 |
| Energy Error | -1.4% |
| Max Total Energy | 86423.6J |
| Max Kinetic Energy | 86265J |
| Max Internal Energy | 23411J |
| Max Contact Energy | 1427.49J |
| Max Force Crossection 1 | 1.58971KN |
| Max Force Crossection 2 | 5.0581KN |
| Intrusion at Hinge Pillar | 1011.03mm |
| Intrusion at B-Pillar | 389.769mm |
| Intrusion at Fuel Tank | 305.658mm |
| Peak veocity | 16.3628m/s |
Provide recommendation on what can help to reduce Fuel tank intrusion.
Use stiffer Materials
Use more reinforcement structure so that the forces are better absorbed.
Conclusion
- Due to reduced model been the forces and energy are not extact
- Use stiffer material to provide better protection to the passengers.
- Intrusion at the hinge pillar is maximum.