Week 10 Bullet penetrating a Bucket Challenge

Explicit Dynamics Analysis of Bullet penetrating a Bucket

Objective

To perform a Expicit Dynamics Simulation of bullet penetrating into a bucket for three non linear materials Cases,they are

Case 1: Aluminum alloy non-linear as Bucket material

Case 2: Copper alloy non-linear as Bucket material

Case 3: Stainless steel non-linear as Bucket material

Material data

Figure. 1 shows the Aluminium alloy non-linear's properties in Ansys Workbench engineering data. It was used in the Given Bucket model's as material input as per Case 1.

Figure. 1 Aluminum alloy non-linear Engineering data

Figure. 2 shows the Copper alloy non-linear's properties in Ansys Workbench engineering data. It was used in the Given Bucket model's as material input as per Case 2.

Figure. 2 Copper alloy non-linear Engineering data

Figure. 3 shows the Stainless steel alloy non-linear's properties in Ansys Workbench engineering data. It was used in the Given Bucket model's as material input as per Case .

Figure. 3 Stainless steel non-linear Engineering data

Figure. 4 shows the Tantalum's properties in Ansys Workbench engineering data. It was used in the Given bullet model's as material input.

Figure. 4 Tantalum  Engineering data

Model Geomentry

Figure. 5 shows the imported given Bullet and Bucket model in the mechanical modular.

Figure. 5 Bullet and Bucket model

Meshing

Figure. 6 illustrates the Edge sizing on both edges of the Bucket with a number of divisions and Figure. 7 illustrates the model is Default meshed with no adaptive sizing and High smoothing quality.

Figure. 6 Edge sizing of the Bucket

Figure. 7 Overall meshed model

Velocity & Fixed joint

Figure. 8 illustrates Fixed joint of the Bucket which is assigned to be the bottom face. Figure. 9 illustrates the velocity of Bullet body with a value of 139000 mm/s in the negative X-direction of the global coordinate system.

Figure. 8 Fixed joint of Bucket

Figure. 9 Joint velocity of Bullet

Case 1

Total Deformation

Figure. 10 Total deformation of Bucket piercing (Aluminum alloy NL)

Equivalent Stress

Figure. 11 Equivalent stress of Bucket piercing (Aluminum alloy NL)

 

Case 2

Total Deformation

Figure. 12 Total deformation of Bucket piercing (Copper alloy NL)

Equivalent Stress

Figure. 13 Equivalent stress of Bucket piercing (Copper alloy NL)

Case 3

Total Deformation

Figure. 14 Total deformation of Bucket piercing (Stainless steel alloy NL)

Equivalent Stress

Figure. 15 Equivalent stress of Bucket piercing (Stainless steel alloy NL)

Comparison of Case 1, Case 2 and  Case 3

 

Parameters	Case 1	Case 2	Case 3
Maximum Total Deformation	1390 mm	1390 mm	1482.3 mm
Maximum Equivalent Stress	501.37 MPa	1359 MPa	2608.6 MPa

 

Conclusion

• Maximum deformation of Case 1 and Case 2 are same but Case 3 is higher than both two previous cases.
• Maximum equivalent stress is higher in Case 3.
• From these statements the Bucket material can be arranged as
  • Maximum Deformation, Stainless Steel NL > Aluminium Alloy NL, Copper alloy NL.
  • Maximum Stress, Stainless Steel NL > Copper alloy NL > Aluminium Alloy NL.