Ansys Autodyn 120 Workshop 02

Worksh orkshop op 2 Fragment Imp mpa act (Workbench)

ANSYS A NSYS AUTODYN A UTODYN

ANSYS, Inc. Proprietary Proprietary © 2009 ANSYS, ANSYS, Inc. Inc. All rights reserved.

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February 27, 2009 Inventory #002665

Workshop Worksho p 2. 2. Fra Fragment gment Impact Impact (W (Work orkbench) bench)

Wor orks ksho hop p Goal Goal and Pro Procedur cedure e

Training Manual

Goal: Model a multi-material cylindr ical fragment fragment impacting impacti ng a plate

Procedure: Start AUTODYN standalone Set up the prob lem in using usin g 2D Axial Symmetry Solve olv e the probl em View the result s Create Create anim animations ations of the resul results ts


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Wor orks ksho hop p Goal Goal and Pro Procedur cedure e

Training Manual

Goal: Model a multi-material cylindr ical fragment fragment impacting impacti ng a plate

Procedure: Start AUTODYN standalone Set up the prob lem in using usin g 2D Axial Symmetry Solve olv e the probl em View the result s Create Create anim animations ations of the resul results ts


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Ste tep p 1 – Sta tart rt Workbench

Training Manual

Start ANSYS ANSYS Workbench ork bench and fo llow llo w th e sequenced sequenced steps us ing the abbreviations bbreviations shown below: below: – DC

= Double Click with L eft Mouse Mouse Button

– SC

= Single Click with L eft Mouse Mouse Button

– RMB = Right Mouse Button Selection D&D D = Drag Drag and Dro p = Hold Left Left Mouse Button down o n item whil e dragging i t – D& to new n ew location loc ation and t hen release release it (i.e., (i.e., Copy Copy or Move) Mov e)

Throug houtt these Worksho Throughou Workshops, ps, the pro procedures cedures shown show n are are not always always the only onl y way to accompl ish the t he desir desired ed tasks, tasks, so feel feel free to investigate in vestigate other methods via the documenta documentation tion when w hen outside of this c ourse • The work shops con sist ently use RMB in th e Outli Outli ne tree to access opti ons whenever whene ver possib le • Often these opti ons c an also also be accessed accessed thr ough the “ Context Context”” To ol ol ba bar • Sometimes these opti ons can also be accessed accessed usin g RMB in t he View area area ANSYS, Inc. Proprietary Proprietary © 2009 ANSYS, ANSYS, Inc. Inc. All rights reserved.

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Workshop 2. Fragment Impact (Workbench)

Step 2 – Activate Beta Options

Training Manual

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

ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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

Training Manual

3.1 Create an Explicit Dynamics (ANSYS) Project

DC RMB

3.2 RMB Geometry > Properties and set Analysis Type to 2D (beta option) ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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Step 4 – Specify the Project Units

Training Manual

4.a Select MKS for the Project Units from 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 futur e). Therefore, always check that the local units system is as desired.


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Step 5 – Define Engineering Data Material DC

Training Manual

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 explic it analyses

SC


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Step 5 – Define Engineering Data Material ...

Training Manual

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 t he Copper , Steel 1006 and Tantalum materials. Note the symbol of a book that appears indicating success.


SC

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Step 5 – Define Engineering Data Material ... 5.e Go to the Engineering Data cell and not e the added materials.

Training Manual

SC

5.f Return to the Project Schematic 5.g Save the Project by selecting the “ Save As” icon and Browse to the directory ind icated by your instructor. Enter “ fragment_impact” for the Project name.


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Step 6 – Import the Geometry

Training Manual

6.1 Import the geometry database fragment_impact.agdb as shown below

RMB

SC

RMB

Note: The course instruc tor will gi ve you the location of this file ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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Step 7 – Edit the Model in Mechanical

Training Manual

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


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Step 7 – Edit the Model in Mechanical ...

Training Manual

7.c Assign the material AL 7039 to the Fragment_Filler part. To access th e materials stored i n the Engineering Data library, SC the default material cu rrently assigned to the part, and a small fly-out arrow wil l appear. SC on that arrow to list the available materials

7.d Repeat step 5.c four more times to assign 1. TANTALUM to Fragment_Core 2. COPPER to Fragment_Outer_Cylinder 3. STEEL 1006 to Inner_Plate 4. STEEL 1006 to Outer_Plate ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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Step 8 – Edit the Model in Mechanical ...

Training Manual

8.e Notice the automatically defined Body Interaction. This allows a sliding interaction between the fragment and th e 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 t hat were automatically generated – always check this)


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Step 9 – Set Element Size and Mesh the Model

Training Manual

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

The default mesh method (Quaddominant) yields a reasonable, but not uniform mesh

RMB


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Step 10 – Change the Mesh Method 10.a Insert a Mapped Face Meshing object

Training Manual

RMB SC

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

10.c Select Apply

RMB

10.d Generate the mesh SC

default

RMB


The mesh is now uniform

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Step 11 – Grade the Mesh in the Outer Plate

Training Manual

RMB

11.a Insert a Sizing control 11.b Pick the Edge selection filter (on the toolbar)

SC

11.c Select the left edge of the Outer_Plate body and then select Apply

SC

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


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Step 11 – Grade the Mesh in the Outer Plate …

Training Manual

RMB

11.e Insert a second Sizing control

SC

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


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Step 11 – Grade the Mesh in the Upper Plate …

Training Manual

11.h Generate the mesh

Upper_Plate

RMB

part now has a graded mesh


SC

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Step 12 – Define the Initial Conditions

Training Manual

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

SC

SC

Select all 3 bodies


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



Step 12 – Define the Initial Conditions ...

Training Manual

12.b Choose Define by Components: X = 2000.0 m/s, Y = 0.0 m/s ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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Step 13 – Apply Boundary Condition to Clamp the Plate

Training Manual

RMB 13.a Insert a Fixed Support

13.b Pick the Edge selection filter

SC

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


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Step 14 – Define the Analysis Settings

Training Manual

SC 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


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Step 15 – Start to Solve in Explicit Dynamics

Training Manual

15.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.

RMB

You must use ANSYS AUTODYN to run the simulation and proc ess results (by importing the cycle zero file created in this step)


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Step 16 – Create (Link to) an AUTODYN Project 16.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 who’s setup is li nked to the Explicit Dynamics Project

D&D

RMB

SC

16.b Open the AUTODYN pr oject, importing the model set up in the Explicit Dynamics pr oject ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

Training Manual

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Step 17 – AUTODYN Solve Executes Automatically

Training Manual

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 solu tion ends prematurely because mesh distor tions produce a degenerate element We need to add Erosion and re-run the simulation ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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

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Step 18 – Re-load Cycle Zero

Training Manual

18.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


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Step 19 – Specify an erosion model for each material

Repeat 19.a – 19.f for each material

Training Manual

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


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Step 20 – Load a Plot Settings File (3D View)

Training Manual

21.a Load the plo t settings file “ fragment_impact.set ” (same view as used in Works hop 1)

21.b Notice that the loaded plot setting s pro vid e a 3D view where the model is rot ated thr ough 270 deg.


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Step 21 – Re-solve the Problem 21.a Solve the problem

Training Manual

During th e solve, the view is autom atically up dated to show the most current solution A summary of the current computation cyc le (Cycl e #, Time, Timestep) is show n below the view panel,

Press Stop at any time to interrupt the Solve


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Step 22 – View Results, Create Animations

Training Manual

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


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Step 23 – View Results from the Save Files

Training Manual

23.a When calculation terminates message gives reason fo r termination

23.b Pull-down menu allow s quic k access to all the Save files Try loading and viewing different Save files


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Step 24 – Create a GIF Slide Show of Results

Training Manual

24.a Select Plots on the Navig ation Bar 24.b Select Generate multi ple slides 24.c Select all the availabl e cyc les (i.e. Save fi les) 24.d Select Start and a GIF animation will be generated (move the window away from t he view before doing this if y ou want to see each slid e of the animation being generated c learly ) 24.e Close the window when the animation i s comp lete


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Step 25 – Create a GFA Slide Show of Results

Training Manual

25.a Select Setup Slideshow

25.b Change the Image type from gif (default) to gfa 25.c Acc ept the data

25.d Perform Step 24 again to pro duce the GFA animation (message is g iven when GFA animation i s com plete)


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Step 26 – View the GIF Animation

Training Manual

26.a Select View Slides on the Navigation Bar to s tart the ANSYS View er

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

26.c View the animatio n


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Ansys Autodyn 120 Workshop 02

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