Week 11 Car Crash simulation

Aim of the project:

To perform the Explicit dynamics simulation for a Car crash model, Capture Total deformation, directional deformation, and Equivalent stress.

Compare the results in varied condition of 3 different values for thickness of car body.

Set Up

1. In the Ansys workbench we chose Explicit dynamics and in engineering data we added the material stainless steel NL.
2. After Importing the car crash model in the Geometry, we opened it in SpceClaim and checked for any abnormalities.
3. Once we opened the model in Mechanical module, we renamed it and assigned Stainless steel NL material to the Car body and kept structural steel material as it is for the wall. For the case 1 we have assigned 0.3 thickness for car body and set it for parametric.
4. We have deleted the existing Bonded contacts and kept body interactions-Frictionless as it is under connections.
5. In the meshing we used face sizing and set element size 300mm for back part of car body, for wall we set tetrahedrons as method and for rest of the places element size was 50mm method was triangles.

6. Under Analysis setting we changed end time as 0.001 and maximum energy error as 0.1 rest everything we kept as it is.
7. Added fixed support to the back portion of the car body as shown below.
8. Added displacement load 500mm in the Z direction to the back face of the wall as shown below.

9. Finally, we requested for solution and got the results as shown below.

Total deformation : - Maximum : 1044.4 mm

Von-mises Stress : - Maximum : 7572.7 MPa

As we added thickness of car body and all results under Parametric, we entered car body thickness in table of design points of parameter set. Later we updated all design points. Now we got parametric results as shown below.

Conclusion

Thickness of Car body	Total Deformation (Max.)	Max. Von-mises Stress (Mpa)
0.3mm	1044.4 mm	7572.7 MPa
0.6mm	1042.77 mm	7463.25 Mpa
1mm	1037.57 mm	7310.17 Mpa

We observed that when thickness of car body increased, there was reduction in total deformation and also in stress.