Bullet Penetrating Bucket Simulation

OBJECTIVE:

To simulate a bullet penetrating into a bucket using 3 different non-linear materials for the bucket and analyse their behaviour for the same velocity of bullet.

SOLUTION:

Step 1: Part Model and Material

The model was used as given and the analysis was carried out for 3 different non linear material; Titanium Alloy NL, Stainless Steel NL and Magnesium Alloy NL, used for the bucket in three different cases. The material for the bullet was assigned as tantalum and the body was defined as rigid, since the focus of the analysis is the bucket.

Step 2: Meshing

The bucket body was meshed such that the mesh is finer along the edges where penetration takes place and coarser on least important faces. This was done by giving a face sizing on these edges with element size of 10mm and a general mesh size of 50mm.

Step 3: Analysis Settings

The bucket was defined as fixed at the bottom face and the bullet was given a velocity of 139000mm/s. The analysis was carried out with end time step as 0.05sec and maximum energy error as 5.

Step 4: Results

The total deformation, equivalent stress and equivalent strains were analysed.

Case1: Titanium Alloy NL

Case 2: Stainless Steel NL

Case 3: Magnesium Alloy NL

Comparison of Results:

Material	Total deformation (mm)	Maximum equivalent stress (MPa)	Maximum equivalent strain
Titanium Alloy NL	6950	3609	0.054067
Stainless Steel NL	6950	3152.2	0.02097
Magnesium Alloy NL	10002	2008.1	0.046336