ANSYS Explicit Dynamics 120 Workshop 01

WS 1-1ANSYS, Inc. Proprietary

© 2009 ANSYS, Inc. All rights reserved.February 27, 2009

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Workshop 1

Taylor Impact Test –Basic Simulation

ANSYS Explicit Dynamics

Workshop 1. Taylor Impact Test – Basic Simulation



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Training ManualWorkshop Goal and Procedure

Goal:

Simulate the impact of rod into a plate (typically known as a “Taylor Test”)

Procedure:

Create an Explicit Dynamics (ANSYS) Analysis System Project

Select the unit system and assign the material properties

Create the rod and plate geometry in DesignModeler

Mesh the two parts and set the initial velocity condition of the rod

Define the analysis settings, boundary conditions, and applied loads

Initiate the solution (AUTODYN - STR) and review the results




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Training ManualStep 1 – Create the Project Schematic

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)

DC

1. Create an ANSYS Explicit Dynamics Analysis System Project




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Training ManualStep 1 – Create the Project Schematic ...

• An alternate method to create the Project Schematic would have

been to Drag and Drop the Explicit Dynamics (ANSYS) Analysis

System onto the blank screen to the right as shown below. Please

note that, 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.

D&D




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Training ManualStep 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

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.




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Training ManualStep 3 – Define Engineering Data Material

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

3.b Select the General Non-linear Materialslibrary. These materials have sufficient physical property data defined so that they can be used in both ANSYS implicit and explicit analyses.

DC

SC

Note:

The material models in the Explicit Materialslibrary are generally more complicated and can only be used in explicit dynamic analyses.




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Training ManualStep 3 – Define Engineering Data Material ...

3.c Select the “+” sign

to the right of the

Aluminum Alloy NL

material model to add

it to the Engineering

Data library.

3.d Likewise, select the

“+” sign to the right

of the Structural

Steel NL material.

Note the symbol of a

book that appears

indicating success.

SC

SC




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Training ManualStep 3 – Define Engineering Data Material ...

3.f Return to the Project

Schematic

3.g Save the Project by

selecting the “Save As”

icon and Browse to the

directory indicated by

your instructor. Enter

“taylor_basic” for the

Project name.

SC

3.e Return to the Engineering Datacell and note the added materials.




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Training ManualStep 4 – Create the Geometry

Note:

The geometry for this workshop is created in Step 4, starting on the

next slide. However, this DesignModeler exercise may be skipped

by importing the geometry database taylor_impact_geometry.agdb

as shown below. If this file is imported, proceed directly to Step 5.

SCRMB

SC

Note:

The course instructor will indicate the directory location of this file.




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Training ManualStep 4 – Create the Geometry ...

4.b Select Meter as the desired length unit.

4.c Select “Always use project unit” to get

around the problem of DesignModeler not

currently being native in Workbench. When

new geometry is created, the existing

Project units will be used in DesignModeler.

4.d Select OK to enter DesignModeler (DM).

RMB SC

4.a To create new geometry, follow the

procedure shown. Double Clicking on

the “Geometry” cell will also work,

since “New Geometry ...” is the default

action for the Geometry cell when a

geometry file is not already associated

with the Project.




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4.e Select the Sketching tab.

4.f Next select the Circle tool from the

Draw Toolbox. This tool requires

that the center point be entered first

followed by a point on the circle’s

circumference.

4.g Use the Left Mouse Button (LMB) and click

on graph origin (a “P” will appear when the

mouse is over the origin). With the LMB still

depressed, slide the pointer away from the

center until a circle is created. Then let go of

the LMB, completing the circle operation.

SC

SC

SC




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4.h Select the General tool from the

Dimensions Toolbox.

4.i RMB select the Radius

operation for the General

Dimensions tool. This is a

temporary selection of a

dimension type.4.j Select the circle,

creating dimension

“R1”. Then enter

0.010 meters in the

Details View for the

circle radius.

Resize the graphics

view, if desired.

RMB




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4.k Select the Extrude

icon, which brings

up the Modeling

mode.

4.l Enter a Fixed Depth

of 0.030 meters in the

Normal Direction via

the Details View.

4.m Select the Generate icon to complete the extrusion operation.




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4.n Return to the Sketching

mode and create a new

sketch (Sketch2) for the

plate construction.

4.o Select the Rectangle tool

from the Draw Toolbox

and draw the rectangle

shown by dragging the

LMB, using the opposite

corners of the rectangle to

define it.

4.p The dimensions of the

rectangle will be defined

next, so now select the

Dimensions Toolbox.




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4.q Select the General tool under the Dimensions Toolbox and

dimension the lines on the top and right side to be 0.040 meters

long. Since the rectangle is no longer centered about the circle,

additional dimensions will need to be defined.

4.r For the next two

dimensions, use the

RMB to select the

Horizontal and then

the Vertical options,

respectively.

RMB selections




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4.s After specifying a Horizontal General

dimension via the RMB, make sure that

ONLY the Vertex filter is active. This will

prevent lines from being accidentally

selected, thereby simplifying the task.

4.t Select the origin, and while holding the

Ctrl key down, select the top right corner

of the rectangle to create dimension H4.

Repeat this procedure (after specifying a

Vertical General dimension via the RMB)

with the same two points to create

dimension V5.

4.u Enter 0.020 meters for both H4 and V5 in

the Details View for these dimensions.

The rectangle is now centered correctly.




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4.w Enter a

Fixed Depth

of 0.010 m in

the Reversed

Direction.

4. x Extrude

Sketch2 via

Generate.

4.v Select the Extrude icon, which accesses the Modeling

mode, and set the Operation to Add Frozen to prevent

merging of the bodies.




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4.y Rename the two solids to be Cylinder and Plate, respectively. Use

the RMB after selecting the body in the tree to access the Rename

function.

RMB

The Cylinder is not

frozen, but the Plate

is frozen. Since the

bodies touch each

other, they would be

merged into one

body if both bodies

were unfrozen.

4.z Save the Project




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Training ManualStep 5 – Edit the Model in Mechanical

5.a Edit the model in Workbench Mechanical.

RMB SC

5.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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Training ManualStep 5 – Edit the Model in Mechanical ...

5.c Assign the material Aluminum Alloy NL to the Cylinder and the

material Structural Steel NL to the Plate. To access the materials

stored in the Engineering Data library, click on the default material

currently assigned to the part, and a small fly-out arrow will appear.

Clicking on that arrow lists the materials available for use.

SC

SC SC




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Training ManualStep 5 – Edit the Model in Mechanical ...

5.d Delete the automatically defined

Contact Region. Alternatively, it

can be changed from Type Bonded

to Frictionless, but the existing

Body Interactions are sufficient as

shown below.

Penalty-based Trajectory contact is

the default interaction and the type

is Frictionless.

RMB

SC




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Training ManualStep 6 – Set Sizing Controls and Mesh Model

6.a Select the Mesh branch

6.b Specify the Mesh Details:

– Physics Preference = Explicit

– Element Size = 0.003 meters

6.c Generate the mesh

RMB




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Training ManualStep 7 – Define the Initial Conditions

7.a Apply an Initial Velocity Condition to the Cylinder as shown.

RMBSC

Note:

If the Body

selection

filter is not

automatically

activated for

the initial

velocity

condition,

select it

manually.




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Training ManualStep 7 – Define the Initial Conditions ...

7.b Choose to define

the Initial Velocity

by Components:

– X = 0 m/sec

– Y = 0 m/sec

– Z = -300 m/sec




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Training ManualStep 8 – Define the Analysis Settings

8.a Select Analysis Settings in the tree and

set the End Time to be 2.0e-4 seconds in

the Details View.

8.b Keep the remaining default settings.

8.c Twenty equally-spaced results sets

should be sufficient for the animations.

SC




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Training ManualStep 9 – Apply Boundary Conditions

9.a Pick the Face selection filter.

9.b Insert a Fixed

Support on the

back face of the

Plate. Rotate the

geometry, as

needed.

RMB




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Training ManualStep 10 – Insert Result Items to Postprocess

10.a Insert a Directional

Deformation plot

request under the

Solution branch and

set the Orientation to

the Z Axis in the

Details View.

RMB

10.b Insert an Equivalent

Plastic Strain plot

request under the

Solution branch.

10.c Save the Project.

RMB




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Training ManualStep 11 – Run the AUTODYN Simulation

11.a Select Solver Output under Solution

Information and RMB Solve to start the

simulation.

RMB

11.b Note: The model

is converted to an

AUTODYN Cycle

Zero database and

submitted to the

AUTODYN solver.

The results are

written to the

standard AUTODYN

files, but are also

available in this

product for review.




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Training ManualStep 11 – Run the AUTODYN Simulation ...

11.c The Solver Output shows the run statistics. This problem will

only take a few minutes to solve and should terminate due to the

condition “wrapup time reached”.




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Training ManualStep 12 – Review the Results

12.a Select Energy Summary under Solution Information to view the

global statistics. Note how the Kinetic Energy of the projectile is

converted into Internal Energy during impact. Also, the Hourglass

Energy is sufficiently small (less than 10% of the Internal Energy).

Internal Energy

Kinetic Energy

Hourglass EnergyPlasticity

develops




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Training ManualStep 12 – Review the Results ...

12.b Select Directional Deformation (Z Axis) and Show the Elements

under True Scale. The maximum displacement (-0.0024 m) is in

the negative Z direction, so it appears as a minimum value.

SC




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12.c Likewise, select Equivalent Plastic Strain.

12.d Animate the results by setting the controls as

shown below and then pressing the Animation

button. For transient dynamics, the default

Distributed mode is often inadequate, as it just

linearly interpolates between saved results and

not enough data sets may have been saved for

good interpolation. The Result Sets mode is

usually best, as only actual saved data is used.

Pick these 2 first

Then pick this

Plastic

strain

constant

after rod

rebound

from

plate.




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12.f Finally, Save the model

and then Exit ANSYS ...

12.e If desired, hide the Plate (or even the Cylinder) to get a better view

of the remaining body. Reorient the animation as needed.

RMB

ANSYS Explicit Dynamics 120 Workshop 01

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Transcript of ANSYS Explicit Dynamics 120 Workshop 01