Workshop 4 2D Axisymmetric Impact

© 2011 ANSYS, Inc. November 1, 2012 1

14.5 Release

Workshop 4 2D Axisymmetric Impact

Introduction to ANSYS Explicit STR &

Introduction to ANSYS Autodyn part I


Workshop Goal and Procedure

Goal:

Model the normal impact of a bullet using an efficient 2D Axisymmetric solution

Procedure:

Start Workbench

Set up the problem using 2D Axial Symmetry

Solve the problem

View the results


Step 1 – Start ANSYS Workbench

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)


2.1 Create an Explicit Dynamics Component

2.2 RMB Geometry > Properties and set Analysis Type to 2D

Step 2 – Initiate a 2D Explicit Dynamics Project

DC RMB


Step 3 – Specify the Project Units

3.a Select MKS for the Project Units from the Units List provided

3.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.


4.a Edit the Engineering Data cell

4.b Select the Data Source View

4.c Select the General Non-linear Materials data source

4.d Select Aluminum Alloy NL and Structural Steel NL

Step 4 – Define Engineering Data Material

DC

SC

SC

SC


Step 4 – Define Engineering Data Material 4.e Select the

Engineering

Data View

4.f Check that Aluminum Alloy

NL and Structural Steel NL

have been added to

Engineering Data (delete

the default Structural Steel

if you want).

4.g Save the

project and

then return to

the project

page

SC SC SC


Step 5 – Import the Geometry 5.a Import the geometry database BulletImpact2D.agdb as shown

below

Note: The y-axis is

always the axis of

revolution in

Workbench

SC

RMB


Step 6 – Edit the Model in Mechanical 6.a Edit the model in Workbench Mechanical.

RMB SC

6.b Select the MKS Units system

6.c Under Geometry, select Axisymmetric for the 2D

Behavior


Step 6 – Edit the Model in Mechanical

6.d Assign the material Structural Steel NL to

the Bullet part.

6.e Assign the material Aluminum Alloy NL to

the Target part.


Step 7 – Set Element Size and Mesh the Model

7.a Select the Mesh branch

7.b Specify the Mesh Details:

– Physics Preference = Explicit

– Max Face Size = 0.1 meters

7.c Generate the mesh

RMB


Step 8 – Define the Initial Conditions 8.a Apply an Initial Velocity Condition to the Bullet as shown.

RMB SC

Note:

If the Body

selection

filter is not

automatically

activated for

the initial

velocity

condition,

select it

manually.

SC

Select the

Bullet


Step 8 – Define the Initial Conditions

8.b Choose Define by Components: X = 0.0 m/s, Y = -500.0 m/s


RMB 9.a Insert a Fixed

Support

9.b Pick the Edge

selection filter

9.c Select the right

edge of the

Target and then

select Apply

SC

Step 9 – Apply Boundary Condition to Clamp Target


Step 10 – Define the Analysis Settings

10.a Select Analysis Settings in the tree

10.b Set the End Time to 1.0e-2 seconds

10.c Keep the remaining default settings

SC


Step 11 – Insert a Result Item to Review Later

11.a Insert an Equivalent

Plastic Strain plot

under the solution

branch

11.b Save the project on

the project page

RMB


12.a Select Solver Output under Solution Information and Solve the

simulation.

Step 12 – Run the AUTODYN Simulation

Solver Output shows run statistics, including estimated clock time to completion. Errors

or warnings are also noted. Termination due to “wrapup time reached” is expected.

SC


Step 13 – Review the Results 13.a Select Equivalent Plastic Strain

- note the eroded nodes shown as red dots

- (these can be turned off under the view menu)

SC


Step 13 – Review the Results

13.b Animate the results by setting the controls shown below and then

pressing the Animation button.

Pick these 2 first

Then pick this

Pick this to

save the

animation


Step 13 – Review the Results 13.c Select Energy Summary under Solution Information. Note how

the Kinetic Energy of the Bullet is converted into Internal Energy

during impact. Also, the Hourglass Energy is small (always check

this).

Internal Energy

Kinetic Energy

Hourglass Energy

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Workshop 4 2D Axisymmetric Impact

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