Assignment 6

Aim:

To analyse the front crash analysis for a given neon car and find out the outputs of shot gun forces, pillar forces, intrusions, accelerations on rocker below B-pillar.

Given conditions:

• 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.

Procedure:

1. Create a rigid wall

Assign a rigid wall to the given model with friction 0.2 and check it once the vector position of the car.

2. Velocity

Create a velocity to all nodes with speed of 15.6 m/s in X-direction

3. Interfaces

Create a proper interface between a car elements and nodes. Properties which have shown below

Sections

Sections which defines internal carrying forces in the car A-pillar, short gun, B-pillar and rails.

Accelerometers

Create accelerometers on rockers below b-pillar to define the acceleration forces

Output requests

1. Section forces

ON A-pillar

ON Rails

On short guns

As we observe that after fitting the car front to the rigid wall, the resultant forces increases gradually. When at 20 ms the peak goes high and after 80 ms the peak decreases gradually

Acceleration forces.

As we observe that, the peak increases and at 55 ms the peak is increases and then decreased.

The distance between nodes is 66695-12751,66244-122048 intrusion node of 66695.66244 and the distance before crash is 781.1 mm and after crash is 624.8 mm is 156.3 intrusion happened. correspondingly to another set of nodes is 701.4 and 609.1 so that 92.3 intrusion happened.

Displacement

vonmisses

Conclusion

Section forces are high after 20 Ms on rails and short gun forces so, possible to increase material properties or add material