ansys autodyn 120 workshop 07
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WS 7-1ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Workshop 7
Projectile Impacting Pre-stressed Container
ANSYS AUTODYN Update
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-2ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualWorkshop Goal and Procedure
Goal:
Model a projectile impacting a pre-stressed container
Procedure:
Pre-stress a container in Static Structural (ANSYS)
Link to Explicit Dynamics (ANSYS) and set up impact problem
Transfer the setup to AUTODYN
Run the pre-stressed analysis in AUTODYN
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-3ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 1 – Start 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)
Throughout these Workshops, the procedures shown are not always the only way to accomplish the desired tasks, so feel free to investigate other methods via the documentation when outside of this course
• The workshops consistently use RMB in the Outline tree to access options whenever possible
• Often these options can also be accessed through the “Context” Toolbar
• Sometimes these options can also be accessed using RMB in the View area
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-4ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training Manual
2.a Create a Static Structural (ANSYS) Project
2.b Select MKS for the Project Units and request Native Applications in Workbench have their values Displayed in the Project Units
Step 2 – Initiate a Static Structural (ANSYS) Project
DC
SC
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-5ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 3 – Import the Geometry3.a Import the geometry database pre-stress_impact.agdb as shown below
RMB SC
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-6ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 4 – Edit the Model in Mechanical
4.a Edit the model in Workbench Mechanical
RMB SC
4.b Select the MKS Units system– Recall that Mechanical is not native in Workbench,
so the Units here may not match the Project Units
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-7ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 5 – Generate the Mesh
5.a Select Mesh
5.b Select Explicitfor the Physical Preference
5.c Enter an Element Size of “2.5e-3” meters
RMB
5.d Generate the mesh
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-8ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 6 – Define a Symmetry Plane
6.a Insert a Symmetry Object
6.b Insert a Symmetry Region
6.c Select the 11 faces shown and then select Apply
6.d Select Z Axis as the Symmetry Normal
Select 11 faces
RMB
RMB
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-9ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 7 – Apply an Internal Pressure
7.a Insert a PressureBoundary
7.b Select the 3 faces internal faces shown and then select Apply
7.c Enter 1.0e6 Pa for the Magnitude of the pressure
RMB
Select 3 faces
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-10ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 8 – Apply Fixed Supports to Container
8.a Insert a Fixed Support
8.b Select the 2 faces shown and then select Apply
RMB
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-11ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 9 – Apply a Fixed Support to the Projectile
9.a Insert a Fixed Support
9.b Select the face shown and then select Apply
RMB
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-12ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 10 – Define a Result Object
10.a Insert an Equivalent (von-Mises) Stress Result object
10.b Apply the Geometry Selection to All bodies
10.c Save the Project from the Project Page with the name “pre-stress_impact”
RMB
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-13ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 11 – Solve to obtain Static Pre-stressing
11.a Solve the static problem
RMB
11.c Displacements are magnified by default. Change the magnification as desired
11.b View the pre-stressed solution
SC
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-14ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 12 – Link to Explicit Dynamics (ANSYS)12.a From the
Project Page drag and drop an Explicit Dynamics (ANSYS) Analysis System onto the Model cell of the Static Structural (ANSYS) System
\
12.b Notice that Engineering Data, Geometry and Model (Mesh) have been linked
D&D
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-15ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 13 – Review the Mechanical Project
13.a Return to ANSYS Mechanical and you will see that the project now has an Explicit Dynamics branch in addition to the Static Structural branch
\
13.b Notice also, that a default Body Interaction has automatically been added to the project, defining Frictionlesscontact between All Bodies. This is exactly what is required to compute the impact of the projectile on the container
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-16ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 14 – Copy the BCs to Explicit Dynamics
14.a Select the Pressure and Fixed Supportboundary conditions in the Static Structural branch (use <control>) and drag and drop them onto the Explicit Dynamics branch. (They are copied into the Explicit Dynamics branch)
\
14.b Do not copy Fix Support 2 as this is not required for the Explicit Dynamics Solve (the next steps assigns a velocity to the projectile instead)
D&D
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-17ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 15 – Assign a Velocity to the Projectile
15.a Create a Velocity Initial Condition
\
15.b Select the Projectile body and then select Apply
15.c Choose Define byComponents
15.d Enter “-10.0”m/s for theY Component
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-18ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training Manual
16.a Select Analysis Settings in the tree
16.b Set the End Time to 4.0e-4 seconds in the Details View
16.c Set the Hourglass Damping to Flanagan Belytschko
16.d Keep the remaining default settings
16.e Save the model on the Workbench Project page
Step 16 – Define the Analysis Settings
SC
At this point, in order to apply the pre-stressing to the Dynamic analysis, the model must be
transferred to AUTODYN for solution
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-19ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 17 – Create (Link to) an AUTODYN Project
17.a From the Project Page drag and drop an AUTODYN Component System onto the Setup cell of the Explicit Dynamics (ANSYS) System
\
17.b Open the AUTODYN project, importing the model set up in the Explicit Dynamics project
D&D
RMB
SC
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-20ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 18 – Pre-stress the Container
18.a Select Init. Cond.On Navigation Bar
18.b Check Activate
18.c Browse to the results file “file.rst” for the static structural system (containing the pre-stress solution)
18.d Return to the Project Page and Save the Project
Workshop 7. Projectile Impacting Pre-stressed Container
WS 7-21ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
February 27, 2009Inventory #002665
Training ManualStep 19 – Run the Pre-stressed Analysis
19.a Select Run to start the solve
19.b Once the calculation is running, Select Stop at any time to stop the calculation (you can then press Runagain to continue the calculation)
The calculation takes approximately 10 minutes to run to completion (about 10,000 cycles)