Simulating a Bullet penetrating a Bucket using Ansys
Objective - To simulate a bullet penetrating into a bucket using Explicit dynamics.
Case 1 - Stainless Steel NL.
Case 2 - Aluminum Alloy NL.
Case 3 - Copper Alloy NL.
Procedure -
Create Explicit Dynamics in Ansys workbench and in engineering data select the material Tantalum from explicit materials and Stainless Steel NL, Aluminum Alloy NL and Copper Alloy NL according to the cases.
Tantalum.
Import the geometry and check in SpaceClaim for any irregularities.
Then open Ansys mechanical and rename the component as Bucket and Bullet then assign the Tantalum material to the Bullet and Stainless Steel NL, Aluminum Alloy NL and Copper Alloy NL material according to the cases to the Bucket and change the stiffness behaviour of the Bullet to Rigid.
Body Interactions - No contacts are defined. Instead a Body Interaction is introduced, the parameters of which are set as shown below.
Mesh - Edge Sizing - The bucket is meshed by elements size of 6mm along its edges.
Mesh
Analysis Settings - Set end time as 1e-2, with maximum number of cycles as 1e+7, Maximum error set to 5.
Fixed Support - Bucket is fixed.
Velocity - Bullet provides the velocity of 139000mm/s in negative X direction.
Run the simulation and results obtained.
Result - The analysis runs successfully and results obtained.
Case 1 - Stainless Steel NL.
Total Deformation Max - 1390 mm
Equivalent Stress Max - 1286.4 Mpa
Energy Conservation Plot
Animation - Equivalent Stress
Case 2 - Aluminum Alloy NL.
Total Deformation Max - 1390 mm
Equivalent Stress Max - 1059.7 Mpa
Energy Conservation Plot
Animation - Equivalent Stress
Case 3 - Copper Alloy NL.
Total Deformation Max - 1390 mm
Equivalent Stress Max - 2046.1 Mpa
Energy Conservation Plot
Animation - Equivalent Stress
Conclusion -
- Total Deformation in Case 1, Case 2 and Case 3 is the same as the distance that is traversed by the bullet in 0.01s.
- The highest stress is observed in case of Copper Alloy NL indicating that Copper Alloy NL offered the maximum resistance to the incoming bullet than the other two materials.
Google drive link - https://drive.google.com/file/d/1tQpUJ9nopRo2YEelV_VHh3D3rw1CcONW/view?usp=sharing