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