Week 11 Car Crash simulation

Objective : To setup the simulation of the given Bucket and bullet penetration test setup to obtain the desired results.

Setting up the simulation 

Importing geometry :
Next we import the geometry and rename them as Wall and Carbody.




Then we will open Ansys explicit dynamics to set up the rest of the simulation.

Body Symmetry : Next we set up the simulation so that the model behaves like it is a full model even though the CAD file is split down the middle.

Body interactions : We create a body interactions collector with all bodies in the set-up.

Mesh : Next we mesh the components.

We apply a patch conforming method of tetrahedrons on the wall to reduce the number of elements.

We apply a face sizing of 175mm on certain faces of the car which aren't critical to reduce the number of elements.


We apply a method of all triangles on all faces of the car to have its elements ass tetrahedrons.

Analysis Settings : 
Next we go to analysis settings to set up the kinematics of the simulation
The analysis is run for an end time 1e-3 and the rest of the analysis conditions are kept as default.

 Fixed Support : Next a fixed support is applied on certain faces of the car body as shown.

Displacement : A displacement is then applied on the Wall in the tabular form as shown of 500mm in the z-direction.

Output Parameters : The following parameters are selected for output from the simulation.

The equivalent stress, total deformation nd directional deformation are selected as output parameters.

The simulation is run on 3 cases, which are as discussed below:

Case_1 : Carbody thickness of 0.3mm
Case_2 : Carbody thickness of 1mm
Case_3 : Carbody thickness of 2mm


Running the simulation : 
Next we run the simulation. The simulation takes about 31.5 minutes to run as we can see from the runtime below.

Post-processing : 

Equivalent Stress :

Case 1)



A total equivalent stress of 3201.9 Mpa occurs on the carbody.

Case 2)

A total equivalent stress of 3472 Mpa occurs in the Bucket.

Case 3)

A total equivalent stress of 3228.3 Mpa occurs in the Bucket.

Total Deformation : 

Case 1)



A maximum deformation of 1056.8 mm occurs in the carbody.

Case 2)

A maximum deformation of 1049.6 mm occurs in the carbody.

Case 3)

A maximum deformation of 1034.4 mm occurs in the carbody.

Conclusion : 

Hence the simulations have been run as per the desired criteria and the results have been obtained.
The maximum stress occurs in case 2 when carbody has a thickness of 2mm.
The maximum deformation occurs in case 1 when carbody has a thickness of 0.3mm.

Result :  File cannot be attached. Attaching google drive link.
Case_1

Case_2

Case_3