Download - Workshop 4 2D Axisymmetric Impact
© 2011 ANSYS, Inc. November 1, 2012 1
14.5 Release
Workshop 4 2D Axisymmetric Impact
Introduction to ANSYS Explicit STR &
Introduction to ANSYS Autodyn part I
© 2011 ANSYS, Inc. November 1, 2012 2
Workshop Goal and Procedure
Goal:
Model the normal impact of a bullet using an efficient 2D Axisymmetric solution
Procedure:
Start Workbench
Set up the problem using 2D Axial Symmetry
Solve the problem
View the results
© 2011 ANSYS, Inc. November 1, 2012 3
Step 1 – Start ANSYS Workbench
Start ANSYS Workbench and follow the sequenced steps using the abbreviations shown below:
•DC = Double Click with Left Mouse Button
• SC = Single Click with Left Mouse Button
•RMB = Right Mouse Button Selection
•D&D = Drag and Drop = Hold Left Mouse Button down on item while dragging it to new location and then release it (i.e., Copy or Move)
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2.1 Create an Explicit Dynamics Component
2.2 RMB Geometry > Properties and set Analysis Type to 2D
Step 2 – Initiate a 2D Explicit Dynamics Project
DC RMB
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Step 3 – Specify the Project Units
3.a Select MKS for the Project Units from the Units List provided
3.b Request that Native Applications in Workbench have their values be Displayed in the Project Units
Note:
Engineering Data is native in Workbench, but DesignModeler and
Mechanical are NOT currently (but will be in the future). Therefore,
always check that the local units system is as desired.
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4.a Edit the Engineering Data cell
4.b Select the Data Source View
4.c Select the General Non-linear Materials data source
4.d Select Aluminum Alloy NL and Structural Steel NL
Step 4 – Define Engineering Data Material
DC
SC
SC
SC
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Step 4 – Define Engineering Data Material 4.e Select the
Engineering
Data View
4.f Check that Aluminum Alloy
NL and Structural Steel NL
have been added to
Engineering Data (delete
the default Structural Steel
if you want).
4.g Save the
project and
then return to
the project
page
SC SC SC
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Step 5 – Import the Geometry 5.a Import the geometry database BulletImpact2D.agdb as shown
below
Note: The y-axis is
always the axis of
revolution in
Workbench
SC
RMB
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Step 6 – Edit the Model in Mechanical 6.a Edit the model in Workbench Mechanical.
RMB SC
6.b Select the MKS Units system
6.c Under Geometry, select Axisymmetric for the 2D
Behavior
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Step 6 – Edit the Model in Mechanical
6.d Assign the material Structural Steel NL to
the Bullet part.
6.e Assign the material Aluminum Alloy NL to
the Target part.
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Step 7 – Set Element Size and Mesh the Model
7.a Select the Mesh branch
7.b Specify the Mesh Details:
– Physics Preference = Explicit
– Max Face Size = 0.1 meters
7.c Generate the mesh
RMB
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Step 8 – Define the Initial Conditions 8.a Apply an Initial Velocity Condition to the Bullet as shown.
RMB SC
Note:
If the Body
selection
filter is not
automatically
activated for
the initial
velocity
condition,
select it
manually.
SC
Select the
Bullet
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Step 8 – Define the Initial Conditions
8.b Choose Define by Components: X = 0.0 m/s, Y = -500.0 m/s
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RMB 9.a Insert a Fixed
Support
9.b Pick the Edge
selection filter
9.c Select the right
edge of the
Target and then
select Apply
SC
Step 9 – Apply Boundary Condition to Clamp Target
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Step 10 – Define the Analysis Settings
10.a Select Analysis Settings in the tree
10.b Set the End Time to 1.0e-2 seconds
10.c Keep the remaining default settings
SC
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Step 11 – Insert a Result Item to Review Later
11.a Insert an Equivalent
Plastic Strain plot
under the solution
branch
11.b Save the project on
the project page
RMB
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12.a Select Solver Output under Solution Information and Solve the
simulation.
Step 12 – Run the AUTODYN Simulation
Solver Output shows run statistics, including estimated clock time to completion. Errors
or warnings are also noted. Termination due to “wrapup time reached” is expected.
SC
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Step 13 – Review the Results 13.a Select Equivalent Plastic Strain
- note the eroded nodes shown as red dots
- (these can be turned off under the view menu)
SC
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Step 13 – Review the Results
13.b Animate the results by setting the controls shown below and then
pressing the Animation button.
Pick these 2 first
Then pick this
Pick this to
save the
animation
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Step 13 – Review the Results 13.c Select Energy Summary under Solution Information. Note how
the Kinetic Energy of the Bullet is converted into Internal Energy
during impact. Also, the Hourglass Energy is small (always check
this).
Internal Energy
Kinetic Energy
Hourglass Energy