Worksh orkshop op 2 Fragment Imp mpa act (Workbench)
ANSYS A NSYS AUTODYN A UTODYN
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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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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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Workshop Worksho p 2. 2. Fra Fragment gment Impact Impact (W (Work orkbench) bench)
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))
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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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.
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SC
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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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
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The mesh is now uniform
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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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
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SC
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Workshop 2. Fragment Impact (Workbench)
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.
February 27, 2009 Inventory #002665
Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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Workshop 2. Fragment Impact (Workbench)
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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