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WS 7-1 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. February 27, 2009 Inventory #002665 Workshop 7 Projectile Impacting Pre-stressed Container ANSYS AUTODYN Update

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Page 1: Ansys Autodyn 120 Workshop 07

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

Page 2: Ansys Autodyn 120 Workshop 07

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

Page 3: Ansys Autodyn 120 Workshop 07

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

Page 4: Ansys Autodyn 120 Workshop 07

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

Page 5: Ansys Autodyn 120 Workshop 07

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

Page 6: Ansys Autodyn 120 Workshop 07

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

Page 7: Ansys Autodyn 120 Workshop 07

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

Page 8: Ansys Autodyn 120 Workshop 07

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

Page 9: Ansys Autodyn 120 Workshop 07

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

Page 10: Ansys Autodyn 120 Workshop 07

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

Page 11: Ansys Autodyn 120 Workshop 07

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

Page 12: Ansys Autodyn 120 Workshop 07

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

Page 13: Ansys Autodyn 120 Workshop 07

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

Page 14: Ansys Autodyn 120 Workshop 07

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

Page 15: Ansys Autodyn 120 Workshop 07

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

Page 16: Ansys Autodyn 120 Workshop 07

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

Page 17: Ansys Autodyn 120 Workshop 07

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

Page 18: Ansys Autodyn 120 Workshop 07

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

Page 19: Ansys Autodyn 120 Workshop 07

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

Page 20: Ansys Autodyn 120 Workshop 07

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

Page 21: Ansys Autodyn 120 Workshop 07

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)