Introduction to Introduction to ANSYS Explicit STR

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Customer Training Material W kh 14 Workshop 14 Oblique Projectile Impact Introduction to Introduction to ANSYS Explicit STR WS14-1 ANSYS, Inc. Proprietary © 2010 ANSYS, Inc. All rights reserved. Release 13.0 December 2010

Transcript of Introduction to Introduction to ANSYS Explicit STR

Page 1: Introduction to Introduction to ANSYS Explicit STR

Customer Training Material

W k h 14Workshop 14

Oblique Projectile Impactq j p

Introduction toIntroduction to ANSYS Explicit STR

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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialWorkshop Goal and Procedure Goal:

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

Create an Explicit Dynamics (ANSYS) Analysis System ProjectSelect the units system and define the materialsImport and mesh the armor geometryp g yDefine analysis settings (including erosion), initial conditions, boundary

conditions and body interactionsSolve and review the results

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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialStep 1 – Create the Project Schematic

St t ANSYS W kb h d f ll th d t i thStart ANSYS Workbench and follow the sequenced steps using the abbreviations shown below:– DC = Double Click with Left Mouse Button

SC S C f– 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 ne location and then release it (i e Cop or Mo e)dragging it to new location and then release it (i.e., Copy or Move)

1. Create an ANSYS Explicit Dynamics Analysis System Project

DC

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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialStep 2 – Specify the Project Units

2.a Select MKS for the Project Unitsfrom 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:Note: Engineering Data is nativein Workbenchin Workbench, but Mechanical is NOT at this time (but will be

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(in the future).

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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialStep 3 – Define Engineering Data Material

3 a Edit the Engineering Data cell to add a3.a Edit the Engineering Data cell to add a material to the default library.

3.b Select explicit materials to load in an existing material model

DCexisting material model.

3.c Scroll down and add CART BRASS, LEAD, RUBBER1 and STEEL 4340

The book symbol confirms it has

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confirms it has been added

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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialStep 3 – Define Engineering Data Material

3.d Check the materials have been added to engineering dataSC

3.c We will use these materials as they are without modification

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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialStep 3 – Define Engineering Data Material ...

3.g Return to the Project Schematic Note: Saving the Project saves all of the important files

3.h Save the Project by selecting the “Save As ” icon and Browse to the

the important files. The Project may also be Archived, in which all of theSave As ... icon and Browse to the

directory indicated by your instructor. Use the name “Oblique_penetration” for the Project name

which all of the supporting files are compressed and saved in one file.for the Project name.

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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialStep 4 – Import the Geometry

4 a Import the geometry by the4.a Import the geometry by the procedure shown. Do NOTDouble Click on the “Geometry” cell ...

RMBSC

Geo et y ce

4.b Browse to the DesignModeler 11 0 SP1DesignModeler 11.0 SP1 geometry file named: “oblique_penetration.agdb”

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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialStep 5 – Edit the Model in Mechanical

5 Edit th d l i W kb h M h i l5.a Edit the model in Workbench Mechanical.

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

RMB SC

5.b Select the MKS Units systemRecall that Mechanical is not native in Workbench so– Recall that Mechanical is not native in 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

Thi ill b h l t h th

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accuracy. This will be shown later when the Analysis Settings are discussed.

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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialStep 5 – Edit the Model in Mechanical ...

5.c Define the materials for each part in turn (multiple parts can be selected by h ldi th t l k )holding the ctrl key):

plate 1 and plate 2 - steel 4340rubber spacer1 → rubber spacer 4 - rubber1p psteel washer 1 → steel washer 8 - steel 4340bolt1 → bolt 4 - steel 4340bullet case - cart brassbullet core leadbullet core - lead

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Customer Training MaterialStep 5 – Edit the Model in Mechanical ...

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

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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialStep 5 – Edit the Model in Mechanical ...

5.e Delete the Bonded Contact RMBRegions

5 f Review the existing5.f Review the existing Body Interactionspecifications

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Customer Training MaterialStep 5 – Edit the Model in Mechanical ...

5.f Review the automatically created symmetry plane

5.g Save the Project

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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialStep 6 – Mesh Model

6.a Select the Mesh branch 6.b Specify the Mesh Details:– Physics Preference = Explicity 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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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialStep 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 meters- set sphere radius to 0.04 meters- set the element size to 0.003 meters

6.h Generate the mesh (via RMB on the Mesh branch > generate mesh)

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> generate mesh)

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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialStep 7 – Define the Analysis Settings

7.a Specify the Analysis Settings:

– End Time = 0.00015 seconds

SC7.b Note the Solve Units = mm, mg, ms

The mm mg ms unit system is the

SC

The mm, mg, ms unit system is the most accurate in most simulations, so it is the only one currently available for solution. Although more solvero so ut o t oug o e so eunit systems will be available in the future, any unit system in the drop-down list may be used to enter data

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and/or display the results.

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Customer Training MaterialStep 7 – Define the Analysis Settings ...

7.c Keep the remaining defaultsNote:

There are multiple ways toThere are multiple ways to control the erosion of an element. In this case, the element will only erode when ythe geometric strain reaches 150%.

7.d Ensure retain inertia of eroded material is set to YES

7.d Use the default number of7.d Use the default number of data sets to save during the solution.

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Customer Training MaterialStep 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

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icon to reverse it– Apply the selection

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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialStep 9 – Insert Result Items to Post-process

9.a Insert a Total Deformation plot request under the

RMB SC

Solution branch

9.b Insert an Equivalent 9 b se t a qu a e t(von-Mises) Stress plot under the solution branch

RMB

SC

9.c Save the project on the project pagep j p g

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Customer Training MaterialStep 10 – Run the AUTODYN Simulation

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

The Solver Output shows the run statistics, including the estimated l k ti t l ti A i l t d

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clock time to completion. Any errors or warnings are also noted. Termination due to “wrapup time reached” is expected here.

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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialStep 11 – Review the Results11.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)

SCSC

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Introduction to ANSYS Explicit STR – Workshop 14

Customer Training MaterialStep 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 d lt Th R lt S t d i ft b t itbetween saved results. The Result Sets mode is often best, 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 The given state will then be shownpick Retrieve This Result. The given state will then be shown.

Pick these 2 first

Then pick this Pick this to h

RMB

Then pick this save the animation

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