Week 10 Bullet penetrating a Bucket Challenge
Simulating a Bullet penetrating a Bucket using Ansys
Objective: To perform a Bullet Penetrating into a bucket using Explicit dynamics.
Case_1- Aluminum Alloy NL
Case_2- Copper Alloy NL
Case_3- Magnesium Alloy NL
Simulation Process:
Create Explicit Dynamics in Ansys workbench and in engineering data select the Material Tantalum from explicit materials and Stainless NL, Aluminium Alloy NL and Copper Alloy NL according to the cases.
Input Geometry
Import the geometry and check in space claim 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, Aluminium alloy NL and copper Alloy NL material according to the cases to the Bucket and change the stiffness behaviour of the bullet to Rigid.
Mesh
- Body Sizing -The Bucket is meshed by elements Size of 8mm along its edges
Final Mesh-
Boundary conditions
Fixed support- one end of the Bucket is fixed
Velocity- Bullet provides the velocity of 139000mm/s in negative X directions
Analysis setting: set end time 1e-2, with Maximum number of cycles as 1e+7,maximum error set to 5.
- Set end time as 1e-3, and all the setting set to default.
Solutions:
All the necessary output variable are selected such as von Mesis stress, stress intensity, equivalent strain etc.
Result – The analysis runs successfully and results obtained.
Case_1- Aluminum Alloy NL
Total Deformations
Equivalent stress
Equivalent strain
Case_2- Copper Alloy NL
Total Deformations
Equivalent stress
Equivalent strain
Case_3- Magnesium Alloy NL
Total Deformations
Equivalent stress
Equivalent strain
Conclusions:
| cases | Equivalent Max stress | Equivalent Max Strain |
| Aluminum Alloy NL | 7.3901 Mpa | 1.9169e-002 mm/mm |
| Copper Alloy NL | 728.27Mpa | 2.5416e-002 mm/mm |
| Magnesium Alloy NL | 588.6 MPa | 4.2149e-002 mm/mm |
Total deformation in case1, case2 and case3 is the same as the distance that is traversed by the Bullet in 0.001s
The highest stress is observed in case of copper alloy NL indicating copper Alloy NL offered the Maximum resistance to the incoming bullet than the other two materials