Explicit Dynamics Analysis for Bullet Penetrating on a Bucket

Explicit Dynamics Analysis for Bullet Penetrating on a Bucket :

Aim :

• To perform Explicit Dynamic Analysis for Bullet Penetrating on a Bucket Model.

Objective :

• To define appropriate materials for the Bullet Penetrating on a Bucket Model.
• To define connections between them.
• To perform mesh for a Bullet Penetrating on a Bucket Model.
• To define appropriate Boundary Conditions to the Model.
• To request outputs for Total Deformation, Von-Mises Stress, Equivalent Elastic Strain.

Figure 1-Bullet Penetration Animation.

Procedure :

Phase 1- Material Set-Up :

• To set up the material for the Worm Gear Model. First, drag and drop the transient structural analysis workspace into the project schematic from the analysis system. This is shown in below Figure 2.

Figure 2-Ansys Workbench Workspace.

• After deploying the Explicit Dynamic analysis system in the project schematic workspace.
• Define the Engineering Data and geometry, To define the Geometry and Engineering Data, Right Click on the Engineering Data and click to edit, it will take to the Engineering Tab.
• There Right Click on the Material Tab, A window will Pop-Up stating Engineering data sources.
• Click on the Engineering Data Sources, There go and select the material to define the engineering data. This is shown in Figure 3,4,5.

Figure 3-Right Click on the Engineering Data.

Figure 4-Right Click on the Material Tab.

Figure 5-Select all these Materials to define the Model.

Phase 2-Geometry Set-Up :

• Next set up the geometry. To set up the geometry, Right-Click on the Geometry option >> Import Geometry. This is shown in below Figure 6.

Figure 6-Importing Geometry.

Figure 7-Selecting the Geometry to Import.

• Next double click on the geometry to check, Whether the model imported, is a Bullet Penetrating on a Bucket Model or not. Space Claim Workspace will open. The model will be imported in the space claim, Which is shown in below Figure 8.

Figure 8-Bullet Penetrating on a Bucket Model in the Space Claim.

Phase 3-Model Set-Up :

• Next, define the model, Double click on the model, The Mechanical Workspace will open, There go and define the material, set up the load case for the model.
• The Model loaded in the mechanical workspace is shown in below Figure 9.

Figure 9-Model Loaded in Mechanical Workspace.

3:1 Assign Material :

• Next, define the material as Tantalum for the Bullet, which is shown in below Figure 10.
• To assign a material, Click on the Geometry >> Select the Bullet Geometry >> Parameter Window >> Assignment >> Tanatalum.
• Similarly, assign the Aluminium Alloy as Material for the Bucket.
• The mechanical properties of the material are shown in below Figures 11-14.
• Case-1 Aluminium Alloy for the Bucket.
• Case-2 Titanium Alloy for the Bucket.
• Case-3 Stainless Steel Alloy for the Bucket.

Figure 10-Assign Tantalum as Material to the Bullet.

Figure 11-Mechanical Properties of Tantalum.

Figure 12-Mechanical Properties of Aluminum Alloy NL.

Figure 13-Mechanical Properties of Titanium Alloy NL.

Figure 14-Mechanical Properties of Stainless Steel NL.

3:2 Define Connections :

• Here for explicit dynamics, The connection will be the Body-Interaction connection, This is only suitable for Explicit Dynamics.
• Within an Explicit Dynamics analysis, the body interaction feature represents the contact between bodies and includes settings that allow you to control these interactions.
• If the geometry you use has two or more bodies in contact, a Body-Interaction object folder appears by default under Connections in the tree. Included in a Body Interactions folder are one or more body-Interaction objects, with each object representing a contact pair.

3:3 Meshing :

• After defining the connections, We have to define mesh for the Bullet Penetrating on a Bucket Model.
• Mesh the model with default element size with tetrahedral elements, Which is shown in the below Figure.

1) Edge Sizing :

• We will be giving edge sizing to get the results accurate.
• Select the two edges which are in the bucket and generate the mesh.

Figure 15-Defined Edge Sizing.

Figure 16-Final Meshed Model.

3:4 Analysis Settings :

• Here for this Bullet penetrating on a Bucket Model, No of steps given for this simulation is 1.
• Load Step Type-Explicit Time Integration.
• End Time-0.01 sec
• Maximum Energy Error = 5
• Initial, Minimum, and Maximum Time Steps -Program Controlled.
• Time Step Safety factor-0.9
• Keep other parameters and options as it is the default.

Figure 17-Analysis Settings.

3:5 Boundary Conditions :

• After giving some parameters in the analysis settings, We have to give boundary conditions.
• Here we have to create two boundary conditions, We have to give Velocity and Fixed Support.
• To give Joint Rotation, Right Click on the Explicit Dynamics >> Insert >> Velocity, Fixed Support. This is shown in below Figure 17.

Figure 18-Give Velocity and Fixed Support.

1) Fixed Support :

• Select the bucket bottom face and give the fixed support, cause bucket should be fixed, Which is shown in below Figure 19.

Figure 19-Defined Fixed Support.

2) Velocity :

• Select the bullet with the solid filter and give the velocity along negative X-Direction as -139000 mm/s.Which is shown in below Figure 20.

Figure 20-Defined Velocity.

Phase 4-Request for the Outputs :

• Here we have to request outputs for the VonMisses Stress, Strain, and for Total Deformation.
• To request Output for Stress,Right Click on the Solution >> Insert >> Stress >> Equivalent Von Misses Stress.
• To request Output for Strain,Right Click on the Solution >> Insert >> Strain >> Equivalent Von Misses Strain.
• To request Output for Total Deformation,Right Click on the Solution >> Insert >> Deformation >> Total Deformation.
• This is shown in below Figure 21.

Figure 21-Requesting Outputs for the Stress, Strain, and Deformation.

• Next request output for the contact.
• To request Contact Tool >> Right Click on the Solution >> Insert >> Contact Tool >> Pressure >> Status,Which is shown in below Figures 22 and 23.

Figure 24-Requesting Output for Contact.

Figure 25-Requesting Outputs for Contact Tool.

• Similarly request the output for the probe.
• The Output requested for the Bullet Penetrating on the Bucket Model is shown in Figure 26.
• After requesting all the outputs, Run the Simulation.

Figure 26-Required Outputs Requested.

• To run the simulation, Right Click on the Solution >> Solve. This is shown in below Figure 27.

Figure 27-Solve all the Outputs Requested.

• After solving the outputs requested, the simulation results for all two cases are shown below Figures.

Case-1 [Equivalent Von Misses Stress] :

Figure 28-Case 1 Equivalent Von-Misses Stress.

Figure 29-Case 1 Equivalent Von-Misses Stress Simulation Animation.

Case-2 [Equivalent Von Misses Stress] :

Figure 30-Case 2 Equivalent Von-Misses Stress.

Figure 31-Case 2 Equivalent Von-Misses Stress Simulation Animation.

Case-3 [Equivalent Von Misses Stress] :

Figure 32-Case 3 Equivalent Von-Misses Stress.

Figure 33-Case 3 Equivalent Von-Misses Stress Simulation Animation.

Case-1 [Equivalent Elastic Strain] :

Figure 34-Case 1 Equivalent Elastic Strain.

Figure 35-Case 1 Equivalent Elastic Strain Simulation Animation.

Case-2 [Equivalent Elastic Strain] :

Figure 36-Case 2 Equivalent Elastic Strain.

Figure 37-Case 2 Equivalent Elastic Strain Simulation Animation.

Case-3 [Equivalent Elastic Strain] :

Figure 38-Case 3 Equivalent Elastic Strain.

Figure 39-Case 3 Equivalent Elastic Strain Simulation Animation.

Case-1 [Total Deformation] :

Figure 40-Case 1 Total Deformation.

Figure 41-Case 1 Total Deformation Simulation Animation.

Case-2 [Total Deformation] :

Figure 42-Case 2 Total Deformation.

Figure 43-Case 2 Total Deformation Simulation Animation.

Case-3 [Total Deformation] :

Figure 44-Case 3 Total Deformation.

Figure 45-Case 3 Total Deformation Simulation Animation.

Results :

Cases	Equivalent Von-Misses Stress (MPa)		Equivalent Elastic Strain (mm/mm )		Total Deformation (mm)
	Max.	Min.	Max.	Min.	Max.	Min.
Case-1 (Aluminium Alloy)	695.71 MPa	3.8728 MPa	1.021e-002 mm/mm	0	1390. mm	1.9816e-027 mm
Case-2 (Titanium Alloy)	1812.4 MPa	10.86 MPa	2.2725e-002 mm/mm	0	1651.4 mm	1.9816e-027 mm
Case-3 (Stainless Steel)	1650.1 MPa	4.4861 MPa	9.9064e-003 mm/mm	0	1390. mm	1.9816e-027 mm

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