Introduction to ANSYS Explicit STR – Workshop 14 - Inside Mines

Customer Training Material

W k h 14 Workshop Oblique q Projectile j Impact p

Introduction to ANSYS Explicit STR ANSYS, Inc. Proprietary © 2010 ANSYS, Inc. All rights reserved.

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Release 13.0 December 2010

Introduction to ANSYS Explicit STR – Workshop 14

Workshop Goal and Procedure


Goal: Perform oblique impact / penetration analysis (with erosion)

Procedure: Create an Explicit Dynamics (ANSYS) Analysis System Project Select the units system and define the materials Import p and mesh the armor geometry g y Define analysis settings (including erosion), initial conditions, boundary conditions and body interactions Solve and review the results

ANSYS, Inc. Proprietary © 2010 ANSYS, Inc. All rights reserved.

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Step 1 – Create the Project Schematic


Startt ANSYS Workbench St W kb h and d follow f ll the th sequenced d steps t using i the th abbreviations shown below: – – – –

DC = Double Click with Left Mouse Button SC = Single S Click C with Left f Mouse Button RMB = Right Mouse Button Selection D&D = Drag and Drop = Hold Left Mouse Button down on item while dragging it to new ne location and then release it (i.e., (i e Copy Cop or Move) Mo e)

1. Create an ANSYS Explicit Dynamics Analysis System Project

DC


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Step 2 – Specify the Project Units


2.a Select MKS for the Project Units from the Units List provided 2.b Request that Native Applications in Workbench have their values be Displayed in the Project Units 2.c Check those unit systems to Suppress from appearing in the Units List Note: Engineering Data is native in Workbench Workbench, but Mechanical is NOT at this time ((but will be in the future). ANSYS, Inc. Proprietary © 2010 ANSYS, Inc. All rights reserved.

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Step 3 – Define Engineering Data Material DC


3 a Edit the Engineering Data cell to add a 3.a material to the default library. 3.b Select explicit materials to load in an existing material model model.

3.c Scroll down and add CART BRASS, LEAD, RUBBER1 and STEEL 4340 The book symbol confirms it has been added ANSYS, Inc. Proprietary © 2010 ANSYS, Inc. All rights reserved.

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Step 3 – Define Engineering Data Material SC


3.d Check the materials have been added to engineering data 3.c We will use these materials as they are without modification


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Step 3 – Define Engineering Data Material ... 3.g Return to the Project Schematic

3.h Save the Project by selecting the “Save Save As ...” icon and Browse to the directory indicated by your instructor. Use the name “Oblique_penetration” for the Project name name.


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Note: Saving the Project saves all of the important files. files The Project may also be Archived, in which all of the supporting files are compressed and saved in one file.



Step 4 – Import the Geometry


4 a Import the geometry by the 4.a procedure shown. Do NOT Double Click on the “Geometry” Geo et y ce cell ...

RMB


SC

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4.b Browse to the DesignModeler 11.0 11 0 SP1 geometry file named: “oblique_penetration.agdb”



Step 5 – Edit the Model in Mechanical


5 Edit the 5.a th model d l iin Workbench W kb h Mechanical. M h i l

RMB

Since Edit is the default action, double-clicking on the Model cell is also acceptable here. here

SC

5.b Select the MKS Units system –

Recall that Mechanical is not native in Workbench, Workbench so the Units here may not match the Project Units

Note: Although the unit system used for data entry and post-processing is the MKS system, the actual unit system used by the AUTODYN solver is the mm-mg-ms system, because it provides higher accuracy. This Thi will ill be b shown h later l t when h the th Analysis Settings are discussed. ANSYS, Inc. Proprietary © 2010 ANSYS, Inc. All rights reserved.

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Step 5 – Edit the Model in Mechanical ...


5.c Define the materials for each part in turn (multiple parts can be selected by h ldi holding the th ctrl t l key): k ) plate 1 and plate 2 rubber spacer1 p → rubber spacer p 4 steel washer 1 → steel washer 8 bolt1 → bolt 4 bullet case bullet core


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- steel 4340 - rubber1 - steel 4340 - steel 4340 - cart brass - lead



Step 5 – Edit the Model in Mechanical ... 5.d



Material assignments can then be checked : -Select Select Geometry -Under Display Style select material -The screen plot will then color the model by material

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Step 5 – Edit the Model in Mechanical ... 5.e Delete the Bonded Contact Regions


RMB

5 f Review the existing 5.f Body Interaction specifications


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Step 5 – Edit the Model in Mechanical ...


5.f Review the automatically created symmetry plane

5.g Save the Project


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Step 6 – Mesh Model


6.a Select the Mesh branch 6.b Specify the Mesh Details: – Physics y Preference = Explicit p – Element Size = 0.006 meters 6.c Apply a Patch Independent Tetrahedrons method to the two parts which make up the bullet (via RMB Mesh > Insert > Method) 6.d Set the element size to 0.005 meters


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Step 6 – Mesh Model


6.e Apply a body sizing to the two plates (via RMB Mesh > Insert > Sizing) 6.f Select the two plates and click Apply on the geometry line 6.g Under type select Sphere of Influence select ZX plane as the sphere centre set sphere radius to 0.04 0 04 meters set the element size to 0.003 meters 6.h Generate the mesh (via RMB on the Mesh branch > generate mesh) ANSYS, Inc. Proprietary © 2010 ANSYS, Inc. All rights reserved.

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Step 7 – Define the Analysis Settings


7.a Specify the Analysis Settings: –

End Time = 0.00015 seconds

SC 7.b Note the Solve Units = mm, mg, ms The mm, mm mg mg, ms unit system is the most accurate in most simulations, so it is the only one currently available for o solution. so ut o Although t oug more o e so solver e unit systems will be available in the future, any unit system in the dropdown list may be used to enter data and/or display the results. ANSYS, Inc. Proprietary © 2010 ANSYS, Inc. All rights reserved.

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Step 7 – Define the Analysis Settings ...


7.c Keep the remaining defaults Note: There are multiple ways to control the erosion of an element. In this case, the element will only y erode when the geometric strain reaches 150%. 7.d Ensure retain inertia of eroded material is set to YES 7.d Use the default number of data sets to save during the solution.


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Step 8 – Apply Initial Condition to bullet


8.a Apply initial velocity to bullet: Select Initial Conditions in the Outline tree – Select the body filter – Select the two bullet bodies (while holding ctrl) – RMB on selected bodies Insert > velocity – Enter a velocity of 800 m/s – Select the direction box – Click on one of the long edges of the bullet – If the red arrow points the wrong way, click the arrow icon to reverse it – Apply the selection –


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Step 9 – Insert Result Items to Post-process RMB

SC

RMB SC


9.a Insert a Total Deformation plot request under the Solution branch 9.b 9 b Insert se t a an Equivalent qu a e t (von-Mises) Stress plot under the solution branch 9.c Save the project on the p project j page p g


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Step 10 – Run the AUTODYN Simulation SC


10.a Select Solver Output under Solution Information and Solve the simulation.

The Solver Output shows the run statistics, including the estimated clock l k time ti to t completion. l ti Any A errors or warnings i are also l noted. t d Termination due to “wrapup time reached” is expected here. ANSYS, Inc. Proprietary © 2010 ANSYS, Inc. All rights reserved.

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Step 11 – Review the Results


11.a Select Total Deformation and Show the Elements under True Scale. note the eroded nodes which show up as red dots (these can be turned off under the view menu)

SC


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Step 11 – Review the Results ...


11.b Animate the results by setting the controls shown below and then pressing the Animation button. For transient dynamics, the default Distributed mode can be inadequate, as it just linearly interpolates b t between saved d results. lt The Th Result R lt S Sets t mode d is i often ft best, b t as it uses the actual saved data. To review a static result, just click on the desired Time or Value from the Tabular Data and use the RMB to pick Retrieve This Result Result. The given state will then be shown shown.

Pick these 2 first Pick this to Then pick this save the h animation


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RMB Release 13.0 December 2010

Introduction to ANSYS Explicit STR – Workshop 14 - Inside Mines

Introduction to ANSYS Explicit STR – Workshop 14 - Inside Mines

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