Bullet penetrating a Bucket Challenge

Objectives: To perform explicit analysis in bullet penetrating bucket challenge

Geometrical Design:

For this analysis we have a 3D Geometry of Bullet and Bucket, this is how model looks like.

Material Properties:

In this analysis 3 different materials will be used for bucket and for bullet only structural steel will be used.

Problem Statement:

A Bucket consist of three different materials will be used for analysis, bucket will be fixed from the bottom side. Bullet will be applied with certain velocity so that it will penetrate into the bucket. The bucket will deform due to effect of impact of bullet. Total Deformation, Equivalent Elastic Strain and Equivalent Stress will be observed throughout the simulation. Explicit dynamics module of ANSYS Workbench will be used for analysis.

Mesh Criterion:

Element Type: Edge sizing

Element Size: 6mm

Boundary Condition:

Bottom face of Bullet will be fixed in all directions; this is how geometry looks like after constrained. We will focus for deformation only on Bucket so Bullet Stiffness Behavior is kept as rigid.

Stiffness Behaviour:

Fixed Support:

Loading & Analysis Setting:

Bullet made up of Structural Steel will be given the velocity of 139 m/s in - X direction.

Velocity:

Post Process:

Case 1: Aluminum Alloy NL

Total Deformation

Equivalent Elastic Strain

Equivalent Stress

Energy Conservation

Case 2: Stainless Steel NL

Total Deformation

Equivalent Elastic Strain

Equivalent Stress

Energy Conservation

Case 3: Copper Alloy NL

Total Deformation

Equivalent Elastic Strain

Equivalent Stress

Energy Conservation

Post Process Results Summary;

Results & Conclusion:

1) Max Total Deformation is Same in all case

2) Max Equivalent Strain is higher in C3 (Copper Alloy NL) and Lower in C2 (Stainless steel NL)

3) Max Equivalent Stress is higher in C3 (Copper Alloy NL) and Lower in C2 (Aluminium NL)