Week 11 Car Crash simulation
Aim : To perform an explicit dynamics simulation on Car crash model.
Objectives :
- Perform a parametric study using 3 different values of thickness for the car body.
- Analyse the total deformation and Equivalent stresses acting on the model.
Procedure :
Engineering data and Material selection :
- Open explicit dynamics model.
- Go to engineering data and open engineering data sources.
- Open general non-linear materials.
- Add Stainless steel NL.
Geometry :
- Open geometry.
- Import the model.
Model setup :
- Open ANSYS mechanical.
- Go to geometry and assign the material to Car body as Stainless steel NL.
- Assign thickness to car body and create it as input parameter.
Symmetry region :
- Insert the symmetry region and select the face of wall and and edges of the car body.
Contacts :
- Delete default contacts.
Meshing :
- Create the method under mesh and select the car body and select the type as triangles.
- Insert sizing and select the faces as below and insert a sizing of 175mm.
- Insert the method select the wall and type as tetrahedrons.
- Click on generate and the mesh will be generated as below.
Fixed support :
- Insert a fixed support under explicit dynamics and select the faces as below, to fix them for the simulation.
Displacement :
- Insert a displacement to the face of wall for 500mm in the Z-Direction.
Analysis settings :
Solution :
Create output results for :
- Total deformation.
- Equivalent stress.
- Equivalent strain.
Results :
Case 1 : For car body thickness 0.3 mm
Total deformation :
Equivalent stress :
Equivalent strain :
Case 2 : For car body thickness 0.7 mm
Total deformation :
Equivalent stress :
Equivalent strain :
Case 3 : For car body thickness 1 mm
Total deformation :
Equivalent stress :
Equivalent strain :
Parametric Study :
Comparison of Results :
| Sr.No. | Results | Case 1 | Case 2 | Case 3 |
| 1 | Maximum Total deformation (mm) | 1034.8 | 1026.9 | 1021.1 |
| 2 | Minimum Total deformation (mm) | 0 | 0 | 0 |
| 3 | Maximum Equivalent stress (MPa) | 12097 | 12019 | 11964 |
| 4 | Minimum Equivalent stress (MPa) | 0 | 0 | 0 |
| 5 | Maximum Equivalent strain | 0.0613 | 0.0609 | 0.0606 |
| 6 | Minimum Equivalent strain | 0 | 0 | 0 |
Conclusion :
From the car crash simulation using three different thickness for car body we obtained varying results for each case. There is only a minor change in the values observed. As the thickness increases the stress, strain and deformation values get decreases.