ansys autodyn 120 workshop 02

WS 2-1ANSYS, Inc. Proprietary 2009 ANSYS, Inc. All rights reserved.

February 27, 2009Inventory #002665

Workshop 2

Fragment Impact (Workbench)

ANSYS AUTODYN

Workshop 2. Fragment Impact (Workbench)



Training ManualWorkshop Goal and Procedure

Goal:

Model a multi-material cylindrical fragment impacting a plate

Procedure:

Start AUTODYN standalone

Set up the problem in using 2D Axial Symmetry

Solve the problem

View the results

Create animations of the results




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




Training Manual

2. Turn On Beta Options under Tools > Options > Appearance (2D Explicit Dynamics is a Beta Option in V12.0))

Step 2 Activate Beta Options




Training Manual

3.1 Create an Explicit Dynamics (ANSYS) Project

3.2 RMB Geometry > Properties and set Analysis Type to 2D (beta option)

Step 3 Initiate a 2D Explicit Dynamics (ANSYS) Project

DCRMB




Training ManualStep 4 Specify the Project Units

4.a Select MKS for the Project Unitsfrom the Units List provided

4.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.




Training ManualStep 5 Define Engineering Data Material

5.a Edit the Engineering Data cell to select pre-defined material models from one of the pre-defined material libraries

5.b Select the Explicit Materials library. Materials in this library have physical property data defined for explicit analyses

DC

SC




Training ManualStep 5 Define Engineering Data Material ...

5.c Select the + sign to the right of the AL 7039 material model to add it to the Engineering Data library.

5.d Likewise, select the + sign to the right of the Copper,Steel 1006 andTantalum materials. Note the symbol of a book that appears indicating success.

SC




Training ManualStep 5 Define Engineering Data Material ...

5.f Return to the Project Schematic

5.g Save the Project by selecting the Save Asicon and Browse to the directory indicated by your instructor. Enter fragment_impact for the Project name.

SC

5.e Go to the Engineering Datacell and note the added materials.




Training ManualStep 6 Import the Geometry6.1 Import the geometry database fragment_impact.agdb as shown

below

Note: The course instructor will give you the location of this file

RMB SCRMB




Training ManualStep 7 Edit the Model in Mechanical

7.a Edit the model in Workbench Mechanical.

RMB SC

7.b Select the MKS Units system Recall that Mechanical is not native in Workbench,

so the Units here may not match the Project Units




Training ManualStep 7 Edit the Model in Mechanical ...7.c Assign the material AL 7039

to the Fragment_Filler part.To access the materials stored in the Engineering Data library, SCthe default material currently assigned to the part, and a small fly-out arrow will appear. SC on that arrow to list the available materials

7.d Repeat step 5.c four more times to assign1. TANTALUM to

Fragment_Core2. COPPER to

Fragment_Outer_Cylinder3. STEEL 1006 to Inner_Plate4. STEEL 1006 to Outer_Plate




Training ManualStep 8 Edit the Model in Mechanical ...

8.e Notice the automatically defined Body Interaction. This allows a sliding interaction between the fragment and the plate (using the default Trajectory contact detection)

The Fragment and the Plate are separated by a small gap (1/2 mm), so no bonded contact regions have been automatically generated (If the two parts were touching, you would have to manually delete any bonded contact regions that were automatically generated always check this)




Training ManualStep 9 Set Element Size and Mesh the Model

9.a Select the Mesh branch

9.b Specify the Mesh Details: Physics Preference = Explicit Element Size = 0.001 meters

9.c Generate the mesh

RMB

The default mesh method (Quad-

dominant) yields a reasonable, but not

uniform mesh




Training ManualStep 10 Change the Mesh Method

10.a Insert a Mapped Face Meshing object

10.b Select all five bodies (RMB in the view area)

10.c Select Apply

10.d Generate the mesh

The mesh is now uniform

RMB

SC

RMBSC

SC

RMB

default




Training ManualStep 11 Grade the Mesh in the Outer Plate11.a Insert a Sizing control11.b Pick the Edge selection

filter (on the toolbar) 11.c Select the left edge of the

Outer_Plate body and then select Apply

11.d Select Number of Divisions: 50, Behavior: Hard, Bias Type: 1st choice, Bias Factor: 5

SC

SC

RMB

SC

SC




Training ManualStep 11 Grade the Mesh in the Outer Plate

11.e Insert a second Sizing control

11.f Select the right edge of the Outer_Plate body and select Apply

11.g Select Number of Divisions: 50, Behavior: Hard, Bias Type: 2nd choice, Bias Factor: 5

SC

RMB




Training ManualStep 11 Grade the Mesh in the Upper Plate

11.h Generatethe mesh

Upper_Platepart now has agraded mesh SC

RMB




Training ManualStep 12 Define the Initial Conditions

12.a Apply an Initial Velocity Condition to the Fragment as shown.

RMB SC

Note:If the Body selection filter is not automatically activated for the initial velocity condition, select it manually.

SC

Select all 3 bodies




Training ManualStep 12 Define the Initial Conditions ...

12.b Choose Define by Components: X = 2000.0 m/s, Y = 0.0 m/s




Training Manual

RMB13.a Insert a Fixed Support

13.b Pick the Edge selection filter

13.c Select the top edge of the Plate and then select Apply

SC

Step 13 Apply Boundary Condition to Clamp the Plate




Training ManualStep 14 Define the Analysis Settings

14.a Select Analysis Settings in the tree

14.b Set the End Time to 7.0e-5 seconds in the Details View

14.c Keep the remaining default settings

SC




Training ManualStep 15 Start to Solve in Explicit Dynamics15.a Select Solution in the Outline Tree and

start a Solve

15.b Explicit Dynamics will start to run the simulation, but will stop immediately after writing an AUTODYN cycle zero file, because a 2D axi-symetric analysis cannot be run in Explicit Dynamics.You must use ANSYS AUTODYN to run the simulation and process results (by importing the cycle zero file created in this step)

RMB




Training ManualStep 16 Create (Link to) an AUTODYN Project16.a On the Workbench

Project page, under Component Systems, drag and drop the AUTODYN component onto the Setup cell for the Explicit Dynamics (ANSYS) project.This creates an AUTODYN project whos setup is linked to the Explicit Dynamics Project

16.b Open the AUTODYN project, importing the model set up in the Explicit Dynamics project

RMB

SC

D&D




Training ManualStep 17 AUTODYN Solve Executes Automatically

17.a After executing the previous step, an AUTODYN window will appear. Press Run and the simulation set up in Explicit Dynamics (ANSYS) will start to solve

However, the solution ends prematurely because mesh distortions produce a degenerate element

We need to add Erosion and re-run the simulation

17.b Uncheck the Marker box to remove the marker message in the view




Training ManualStep 18 Re-load Cycle Zero18.a The quickest way

to re-load cycle zero is from the pull-down menu in the Plots dialog panel

18.b Press Materials on the Navigation Bar and notice that data for the four materials that were defined in Engineering Data (Explicit Dynamics) are available for modification in AUTODYN




Training ManualStep 19 Specify an erosion model for each material

19.a Select a material

19.b Modify the material data

19.c Select Geometric Strain for the erosion model

19.d Enter 2.0(200%) for the erosion strain

19.e Select Instantaneous for the Type of Geometric Strain

19.f Accept the data

Repeat 19.a 19.f for each material




Training ManualStep 20 Load a Plot Settings File (3D View)

21.a Load the plot settings file fragment_impact.set(same view as used in Workshop 1)

21.b Notice that the loaded plot settings provide a 3D view where the model is rotated through 270 deg.




Training ManualStep 21 Re-solve the Problem

21.a Solve the problem

During the solve, the view is automatically updated to show the most current solution

A summary of the current computation cycle (Cycle #, Time, Timestep) is shown below the view panel,

Press Stop at any time to interrupt the Solve




Training ManualStep 22 View Results, Create Animations

Optional : Follow steps 23 to 34 of Workshop 1 to view results and create GIF and GFA animation




Training ManualStep 23 View Results from the Save Files

23.a When calculation terminates message gives reason for termination

23.b Pull-down menu allows quick access to all the Save files

Try loading and viewing different Save files




Training ManualStep 24 Create a GIF Slide Show of Results

24.a Select Plots on the Navigation Bar

24.b Select Generate multiple slides

24.c Select all the available cycles (i.e. Save files)

24.d Select Start and a GIF animation will be generated (move the window away from the view before doing this if you want to see each slide of the animation being generated clearly)

24.e Close the window when the animation is complete




Training ManualStep 25 Create a GFA Slide Show of Results

25.a Select Setup Slideshow

25.b Change the Image type from gif (default) to gfa

25.c Accept the data

25.d Perform Step 24 again to produce the GFA animation

(message is given when GFA animation is complete)




Training ManualStep 26 View the GIF Animation

26.a Select View Slides on the Navigation Bar to start the ANSYS Viewer

26.b Open the GIF animation (select the file fragment_impact.gif)

26.c View the animation




Training ManualStep 27 View the GFA Animation

27.a Open the GIF animation (select the file fragment_impact_00nn.gfa)

27.c View the animation

27.c Change the animation view

ansys autodyn 120 workshop 02

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