Week 10 Bullet penetrating a Bucket Challenge

Bucket Bullet Challenge

Objective: In this challenge we have to pass the bullet through the bucket, make the simulation work with three various non-linear materials & compare the results.

Case setup & execution:

1. Open ansys workbench. Next click on explicit dynamics from analysis systems.
2. Now rename the model as required. Open the engineering materials & select explicit materials such as tantalum & aluminum alloy.
3. Now import the geometry from the required folder & check if the model doesn’t have any defects.
4. Next click on model, click on edit & let the model be open the ansys enterprise.
5. Click on geometry select material of aluminum for bucket & tantalum for bullet.
6. Moving on connections s, check for any default contact generated & delete the contact if any. Let the body interaction be user defined.
7. Next mesh the model. Insert sizing select two edges and provide a mesh size of 5mm. We can refine the mesh if required in order to get accurate results. Generate mesh and check for refinement.
8. Now in analysis setting provide an end time of 0.01 & energy error of 5.
9. Insert a fix support and select the bottom edge of the bucket. Next insert a velocity factor provide a velocity of -250000 mm/s to the bullet.
10. Now as required in the solution generate various results as required such as deformation and equivalent stress & strain.
11. Hit solve & wait for the simulation to complete and check for various results generated.

Results & Conclusion:

In the above simulation we have choose 4 various cases. Following are the types as mentioned below.

Sr no	Case	Bucket material	Equivalent stress	Equivalent strain	Deformation
1	Case 1	Aluminum alloy 1100-O	214.88mpa	0.004017	1852.22mm
2	Case 2	Aluminum alloy NL	631.86mpa	0.009189	824.06mm
3	Case 3	Stainless steel NL	738.62mpa	0.0058169	108.95 mm
4	Case 4	Titanium alloy NL	834.14mpa	0.018598	592.57 mm

Case 1: In this we have choose the default material as shown in the video. For bullet we have choose the material as tantalum & for bucket we have choose aluminum alloy from explicit material. From the results it can be observed that the bullet is passing through the bucket and various stress developed on the bucket. Equivalent stress generated in this case is 214.88mpa, equivalent strain generated is 0.004017 & we have got a total deformation of 1852.22mm.

Case 2: In this we have choose the default material as shown in the video. For bullet we have choose the material as tantalum & for bucket we have choose aluminum alloy non-linear as material. From the results it can be observed that the bullet is passing through the bucket and various stress developed on the bucket. Equivalent stress generated in this case is 631.86mpa, equivalent strain generated is 0.009189 & we have got a total deformation of 824.06mm.

Case 3: In this we have choose the default material as shown in the video. For bullet we have choose the material as tantalum & for bucket we have choose aluminum as. From the results it can be observed that the bullet is passing through the bucket and various stress developed on the bucket. Equivalent stress generated in this case is 738.62mpa, equivalent strain generated is 0.0058169& we have got a total deformation of 108.95mm.

Case 4: In this we have choose the default material as shown in the video. For bullet we have choose the material as tantalum & for bucket we have choose aluminum as material. From the results it can be observed that the bullet is passing through the bucket and various stress developed on the bucket. Equivalent stress generated in this case is 834.14mpa, equivalent strain generated is 0.18598 & we have got a total deformation of 592.57mm.

Conclusion:

From the results we can observe that the bullet passed through the bucket in case 1 & for other cases it only passed through the single side or repelled back from the bucket. So with that we can see that from the above material titanium is the hardest material as it didn’t allowed the bullet to pass through. In case 2 the bullet passed through single side and failed to pass from the other end. So in case 4 titanium being the hardest material the equivalent stress generated is more and in case 1 where the bullet passed through the equivalent stress created is very low. So the hardest material can withstand the bullet but the stress generated is very high. With the simulation we can rate titanium being the hardest and aluminum 1100-0 being the weakest among all.