Week 10 Bullet penetrating a Bucket Challenge

AIM:

To simulate a bullet penetrating into a bucket

OBJECTIVE:

To simulate a bullet penetrating into a bucket. You will need to use 3 different non linear materials for the bucket and analyse their behaviour for the same velocity of bullet. Apply the conditions for bullet as mentioned in the video itself. Attach an animation to show the behaviour in the three cases.

PROCEDURE:

.Select Explicit Dynamics, drag and drop into Project Schematic.
.Structural Steel NL, Aluminium Alloy NL and Stainless Steel NL are chosen under Engineering Data.
.Under geometry tab, import the given geometry, double-click to open Space Claim to register the model.
.Stiffness Behaviour of Bullet is changed to Rigid under Material.
.Material of Bucket is changed as per the case:
.Case 1: Structural Steel NL
Case 2: Aluminium Alloy NL
Case 3: Stainless Steel NL

.Mesh size was set to 10mm.
.Face sizing was given to the outer surface of the bucket with 4mm mesh size.
.Under explicit dynamics tab, we set the analysis to 1 step with end time 1e-2s.
.Velocity of 1.39e5mm/sec is given to the bullet in negative x direction.
.The base of the bucket is fixed.
.Total deformation and Equivalent Stress plots are requested from the solver as outputs.
.Run the simulation by clicking on SOLVE.

CONDITIONS

MATERIAL PROPERTIES

STRUCTURAL STEEL NL



ALUMINIUM ALLOY NL



STAINLESS STEEL NL



TANTALUM



MESHING




FIXED SUPPORT



VELOCITY



CASE 1: Bucket material is structural steel NL

EQUIVALENT STRESS



EQUIVALENT ELASTIC STRAIN



TOTAL DEFORMATION


CASE 2: Bucket material is Aluminium alloyNL

EQUIVALENT STRESS



EQUIVALENT ELASTIC STRAIN



TOTAL DEFORMATION



CASE 3: Bucket material is stainless steel NL

EQUIVALENT STRESS



EQUIVALENT ELASTIC STRAIN



TOTAL DEFORMATION



RESULTS:

Case: Bucket Material	Eq. Stress (MPa)	Tot. Deformation (mm)	Equivalent elastic strain (mm)
Case 1: Structural Steel NL	1851.8	695	0.041152
Case 3: Aluminium Alloy NL	840.53	695	0.011839
Case 3: Stainless Steel NL	2754.3	695	0.015989

We can observe that the deformation in all cases are equal but there is a huge variation in maximum von-mises stress. Maximum stress is experienced by stainless Steel NL and minimum stress is experienced by Aluminium Alloy NL.