ANSYS Workshop 2

7/28/2019 ANSYS Workshop 2

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Workshop 2

Steel Bracket

Modified by (2008): Dr. Vijay K. Goyal

Associate Professor, Department of Mechanical Engineering

University of Puerto Rico at Mayagez

Thanks to UPRM students enrolled in INME 4058

sections 2006-08

University of Puerto Rico at Mayagez

Department of Mechanical Engineering


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Scope

The purpose of this problem is to

demonstrate how to solve the

displacements and stresses of a

homogeneous steel bracket using ANSYS.


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Problem description

F=1000

The plate is fixed

at the two holes

Solve a 2D stress analysis of the simple bracket shown below:


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Starting ANSYS

From your desktop:

Click on: START > All Programs >

ANSYS >ANSYS Product Launcher.

Here we will set our Working Directory

and the Graphics Manager


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2. Specify working directory and give a job name.

1. Launch ANSYS product launcher.

Starting ANSYS


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Click the button:

Customization/Preferences.

On the item ofUse custom

memory settings type 128on Total Workspace (MB):

and type 64 on

Database (MB):

Then click the Run

bottom.

Graphics Setup

* This setup applies to computers running under 512 MB of RAM


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This is ANSYSs Graphical User Interface window.

ANSYS GUI Overview


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To change title go to file and choose change title.

Changing Title


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Give the simplified version a title such as Steel bracket.


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Go to preferences and choose structural and leave the h method as the discipline

options.

Preferences


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Pre Processing


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Element type

It is important to define the element type for the beam. For this problem we will

use solid 8 node82. To chose this element type click:

Element type Add/Edit/Delete Solid 8 node 82Pre processor


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In the Element Types window, click on Options, select K3 Plane Stress withthickness, K5 Nodal Stress.


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Real Constants

To define the geometric properties we select real constants. The real constant are thedimensions that must remain constant during the design. These constants are:thickness, among

others.

For the wall thickness TKWALL: 5 mm

To chose the real constants click:

processor Real Constants Add/Edit/Delete


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To define the element material properties we choose material models. Our material

will have a Modulus of Elasticity of 70,000 (MPa) and a Poissons ratio of 0.33

To add material properties click:

Material properties

Preprocessor Material Props Material Models Structural Linear Elastic Isotropic

When the pop up window appears, write the modulus of elasticity and the Poisson's ratio


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Geometry of the steel bracket

Create the main rectangular shape.

The main rectangular shape has a width of 80 mm, a height of 100 mm and the

bottom left corner is located at coordinates (0,0).

To create this click:

Preprocessor Modeling Create Areas Rectangle By 2 corners

A pop up window will appear asking for the position of the corners

Type 0

Type 0

Type 80

Type 100


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This is an illustration of the created rectangle.


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Create the circular end on the right hand side.

The center of the circle is located at (80,50) and has a radius of 50 mm. Click:

Preprocessor Modeling Create Areas Circle Solid Circle

Type 80

Type 50

Type 50


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The new geometry will look like this:


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Create two circles on the left by using the same procedure as

Slide 14 but with different values


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Add a rectangular area to fill in the space between the circles at

the left. To do this we use the same procedure as Slide 12 but with

different values to create a rectangle by two corners.

Type -20

Type 20

Type 20

Type 60


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The new geometry will look like this:


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Now select the Add Areas feature from the Booleans

Operations Menu. Once we select this option we click

on all the areas of the solid. The result should be an

undivided solid. Click:

Preprocessor Modeling Operate Boolean Add Areas


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Now we create the bolt holes. We create the circular shapes thesame way we did previously on Slide 14: Type the numbers shownbelow for each circle individually.


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Using the Boolean operations we must subtract the circles from theremaining area. Click:

Preprocessor Modeling Operate Booleans Subtract Areas

The new geometry should look like this:


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Mesh

For this problem we will be using the smart size tool since we want a

finer mesh since we have holes and there is a stress concentration on

that area. Click:

Preprocessor Meshing Mesh Tool

When the pop up window

appears set it as the figure to

the right.

Smart size set to 5

Click Mesh and thenOk.


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The solid should now look like this:


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Choose Circle.

Boundary conditions

Preprocessor Define Loads Apply DisplacementStructural On Nodes

The following pop up window will appear.

Now the boundary conditions are applied to the bolt circles, this is why the

displacement in the circle is set on the bolt circles nodes.


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Place area in center of bolt holes. Click and hold, extending circle to the outer

edges of the hole. This will select all nodes on the surface of the hole.


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The load F will be applied at a keypoint at the bottom of thelarge circle. To pick this point, we must plot the keypoints.

From the menu select Plot, Keypoints, Keypoints.

Loads


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Preprocessor Define Loads Apply Structural Force/Moment On Keypoints

To apply the load click:


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Select

the

Keypointat the

bottom of

the largecircle.


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Enter:

FY: -1000

(Note given in Newtons)


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Solution


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To start the solution phase it is important to set the type of analysis.

Analysis type

We will perform a static analysis since we only want stresses and

deflections. To select analysis type click:

Solution Analysis Type New Analysis Static Ok


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Now we proceed to solve the problem. To do this click:

Solve

Solution Solve Current LS

Note: When the pop up windows appear click the OK button.


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A pop up window that says: Solution is done will appear

after ANSYS finishes solving the problem. Click close


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Post processing

FEM Solution & Plotting Results


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FEM Solution & Plotting Results

Now we already developed the geometry, Loads & Displacements

and the meshing. We will start with the finite element analysis andobtain the displacements and stresses on the key points.

After make the FEM solution we are able to plot the results, in this

case the displacements and stresses.


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Reading Results

To read the results click:

Solution General Postproc Results summary Read Results First Set

Click here

Vi d fl ti lt


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To view the results of the applied load we useplot results of the deformed shape.Click:

View deflection results

Chose

def+Undeformed

General postproc Plot results Deformed shape


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The deformed shape plot will look like this:


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To see the results of the deflection we use the nodal solution. Click:

General postproc Plot results Contour plot Nodal Solution

Stress results


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The plot will look like this:


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END of Analysis using ANSYS 10.0

Documents

ANSYS Workshop 2