Week 11 Car Crash simulation
Car Crash Simulation
Objective:
To perform a parametric car crash simulation for three different thickness of the car body & compare the total deformation and equivalent stress.
Geometry:
The above geometry consist of a car body & a wall as seen above.
Symmetry:
For decreasing the computational load, the actual car body & wall geometry has been considered as a symmetric half as shown above.
Materials:
Structural Steel NL is defined as material for the car body & its properties are shown above.
Structural Steel is defined as material for the wall & its properties are shown above.
Mesh:
Mesh metrics is shown above.
Min Size: 11.2mm
Max Face Size: 56.04mm
Max Tetra Size: 56.04mm
No of Nodes: 10826
No of elements: 29041
Boundary Conditions:
A displacement load is given to the wall in Z direction as shown above.
The cad body is fixed at the above highlighted location as shown above.
Analysis Settings:
The above analysis settings is used with a end time of 6e-4s.
Table of design points: 
Parametric simulation is run for different car body wall thickness & the corresponding total deformation & equivalent stress.
Case 1: 0.3mm car body thickness
Energy Conservation:
Time Increment:
Results:
Total Deformation:
A max Total deformation of 0.74461m as shown above.
Equivalent Stress:
Max Equivalent Stress of 1.5167e10Mpa is seen as shown above.
Case 2: 0.5mm car body thickness
Energy Conservation:
Time Increment:
Total Deformation:
Total Deformation of 0.73977m as seen above.
Equivalent Stress:
Max Equivalent Stress of 1.5047e10Mpa as shown above.
Case 3: 0.6mm car body thickness
Energy Conservation:
Time Increment:
Total Deformation:
Total Deformation of 0.73723m as shown above.
Equivalent Stress:
Max Equivalent Stress of 1.5035e10Mpa as shown above.
Comparison:
|
|
Total Deformation (m) |
Directional Deformation X (m) |
Directional Deformation Y (m) |
Directional Deformation Z (m) |
Equivalent Stress |
|
Case 1 |
0.74461 |
0.0187733 |
0.053118 |
0.74335 |
1.516e10 |
|
Case 2 |
0.73977 |
0.019196 |
0.052366 |
0.73848 |
1.5047e10 |
|
Case 3 |
0.73723 |
0.019082 |
0.051953 |
0.73593 |
1.5035e10 |
From the above comparison table, it’s clear that more the wall thickness of the car body lesser is the deformation & the equivalent stresses. Hence, Case 3 (0.6mm) has the least deformation & equivalent stress.
Link to Simulation files: https://drive.google.com/file/d/1opIue0wUWbDGfcpA6iFjgAla5GPtfn8H/view?usp=sharing