Week 10 Bullet penetrating a Bucket Challenge
OBJECTIVE:
To simulate a bullet penetrating into a bucket by using 3 different non linear materials for the bucket and analyse their behaviour for the same velocity of bullet.
Case setup:
- From the engineering data source we have selected three non linear material i.e Aluminium alloy NL, Stainless Steel NL, Magnesium Alloy NL.
- The geometry is imported and and the bucket is assigned the non linear material one by one in the three cases where as we have assigned tantalum material to the bullet.
- Since it is going to be an impact load on the bucket we have removed the contact between them.
- For the mesh we have assigned edge sizing to the edge of the bucket with element size of 6 mm.
- In the analysis setting we have assigned the end time as 1e-2 and energy error as 5.
- We have applied fixed support to the base of the bucket and a velocity of 1.39e5 to the bullet in the direction of the bucket.
- Finally the output which are required are called out for solving
Results:
case1 (Aluminium Alloy NL)
Total deformation:
Directional deformation:
Elastic strain:
Equivalent stress:
case2 (Magnesium Alloy NL)
Total deformation:
Directional deformation:
Elastic strain:
Equivalent stress:
case3 ( Stainless steel NL)
Total deformation:
Directional deformation:
Elastic strain:
Equivalent stress:
Discussion & Conclusion:
| Total deformation | Directional deformation | Equivalent stress | Elastic strain | |
| Case 1 | 1400.9 mm | 1390 mm | 725.89 MPa | 0.0106 mm/mm |
| Case 2 | 1542.1 mm | 1390 mm | 838.4 MPa | 0.0215 mm/mm |
| Case 3 | 1389.3 mm | 1374.5 mm | 1679.9 MPa | 0.0095 mm/mm |
From the above table we can see the deformation is maximum in case of Magnesium alloy. So is the case with directional deformation.
The equivalent stress is maximum in case of Stainless steel followed by Magnesium alloy, and minimum in case of Aluminium alloy.
The elastic strain is maximum in case of Magnesium alloy.
Thus from the above discussion we can conclude that use of aluminium as a material for the bucket would be a better choice.
Animation file
case 1
case 2
case 3
https://drive.google.com/file/d/1ykQf-y3s3umH-TWjcq5da6PzBa_E00hZ/view?usp=sharing