Assignment 6-Frontal Crash Simulation Challenge

COMPLETED THROUGHT LIVE SESSION :

Aim:-

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 :-

Import the model,

Assigned the details as given in the question.

Simulated Model.

LIVE SESSION .

Energy Graph

Maximum Internal Energy :-38869.2

Maximum Total Energy :-98349.5

Minimum Total Energy :-95940.5

Resultant velocity at node 66695

Resultant velocity at node 66244

Rigid wall forces.

Sectional Forces of A pillar Left ,Apillar Right ,Shot gun left,Shot gun right,Rail Right and Rail Left.

Maximum Forces in A pillar Left :- 0.771776

Maximum Forces in shot gun left :- 2.51677

Maximum Forces in Rail Right :- 11.990.

Accelerometer.

Conclussion :-

Results from the 10 created sections shows that maximum force is acting upon the rails ,followed by the surface behing the bumber and the shotgun sections .the least value is force absorbed by the aA pillars,there is no deformation in the A pillar,that means intrusioninto the cabin was minimalthe risk for injury was also minimal.Center of gravity plays an important role in crash analysis.it is an important concept in determining the stability of a structure.the kinetic energy is reducing because it is converted into internal energy and total energy .The energy error ,mass error and hourglass energy are under the acceptable values.