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WORKSHOP 8A

TENSION COUPON


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WS8A-2

NAS120, Workshop 8A, May 2006

Copyright 2005 MSC.Software Corporation


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z Workshop Objectives

z Build the tension coupon geometry

z Control the mesh by using techniques discussed in class

z Compare FEA stress results to theoretical results

From Stress Concentration Factors by R. E. Peterson, Figure 86:

max = 432 psi


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z Problem Description

z A tension coupon is constructed from aluminum with E = 10 x 106

psi and n = 0.3

z The coupon thickness is 0.125 in

z An edge load of 50 lb is applied to the tension coupon


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50 lb

10 in

4 in

2.0 DIA

Hole


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z Suggested Exercise Steps1. Create a new database.

2. Create a geometry model of the tension coupon.

3. Use Mesh Seeds to define the mesh density.

4. Create a finite element mesh.

5. Verify the finite element mesh.

6. Define material properties.

7. Define element properties and apply them to the model.

8. Apply boundary conditions to the model.9. Apply loads to the model.

10. Submit the model to MSC.Nastran for analysis.

11. Post Process results using MSC.Patran.


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b c

d

e

f

g

Step 1. Create New Database

Create a new database called

tension_coupon_a.db.

a. File / New.b. Enter

tension_coupon_a as

the file name.

c. Click OK.

d. Choose Default

Tolerance.e. Select MSC.Nastran as

the Analysis Code.

f. Select Structural as the

Analysis Type.

g. Click OK.

a


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Step 2. Create Geometry

Create the first curve.

a. Geometry: Create / Curve /

XYZ.

b. Enter for the Vector

Coordinate List.

c. Enter[0 0 0] for the Origin

Coordinate List.

d. Click Apply.

a

b

c

d

Step 2 Create Geometry


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Create the second curve by

translating the first curve.

a. Geometry: Transform /

Curve / Translate.

b. Enter for the

Direction Vector.

c. Click in the Curve List box

and screen pick the first

curve.

a

b

c



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Create two more curves


Point.

b. Screen pick the point at the

bottom of the left curve.

c. Screen pick the point at the

bottom of the right curve.

A curve is automatically

created because Auto

Execute is checked.

d. Screen pick the top of the

left curve.

e. Finish creating the top

curve by screen picking the

point at the top of the right

curve as shown.

a

b c

ed



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Create a chain curve


Chain.

b. Rectangular pick all four

curves.

c. Click Apply.

d. When the message box

appears, chooseYes to

delete the original curves.

a

b

c

d



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Create a circle


2D Circle.

b. For the circle radius, enter

1.0.

c. For the Center Point List,

enter[5 2 0].

d. Click Apply.

a

c

b

d



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Create a trimmed surface

a. Geometry: Create / Surface

/ Trimmed / Option: Planar.

b. Click in the Outer Loop List

box.c. Screen pick the outer

curve.

d. Click in the Inner Loop List

box.

e. Screen pick the inner circle.

f. Click Apply.

g. When the message boxes

appear, chooseYes to

delete the original curves.

h. Click the Refresh Graphics

icon

a

b

d

c

e

f

g

h



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Create two more circles


2D Circle.

b. For the circle radius, enter

1.1.

c. For the Center Point List,

enter[5 2 0].

d. Click Apply.

e. Repeat this procedure for acircle with a radius of1.2.

a

b

d

c



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Associate the two curves to the

surface

a. Geometry: Associate /

Curve / Surface.

b. Select the Curve filter.

c. Rectangular pick both

circles.

d. Screen pick the trimmed

surface.

a

b

c

d

Step 3. Create Mesh Seeds


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p

Create a uniform mesh seed

a. Elements: Create / Mesh

Seed / Uniform.

b. Enter48 for the Number of

Elements.

c. Click in the Curve List box.

d. Select the Curve or Edge

element filter.

e. Rectangular pick the twocircles and the edge of the

hole.

a

b

c

d

e

Step 3. Create Mesh Seeds


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p

Create a biased mesh seed

a. Elements: Create / Mesh

Seed / Two Way Bias.

b. Enter20 for the Number of

Elements.

c. Enter0.25 for L2/L1.

d. Click on the Curve List box.

e. Screen pick the top edge of

the surface, as shown.f. Screen pick the bottom

edge of the surface to

apply the mesh seed there

as well.

a

b

c

d

f

e

Step 4. Create Mesh


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p

Create a finite element mesh

a. Elements: Create / Mesh /

Surface.

b. Set the Element Shape to

Quad, Mesher to Paver,

and Topology to Quad4.

c. Click in the Surface List

box.

d. Screen pick the surface as

shown.

e. Enter1.0 as the value for

Global Edge Length.

f. Click Apply.

a

b

cd

f

e

Step 5. Verify Mesh


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Verify the quality of the finite

elements

a. Elements: Verify / Quad /

All.

b. Click Apply.

c. When the message box

appears, click OK.

d. Review the summary table.

a

b

c

d

Step 5. Verify Mesh


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Perform specific quality

tests on the elements.

a. Elements: Verify /

Quad / Aspect.

b. Click Apply.

c. When Message

appears, click OK.

d. Review the fringe

plot.

e. Repeat for Warp,

Skew, and Taper

tests.

f. Reset Graphics.

d

a

b

d

ec

f

Step 6. Create Material Properties


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Create an isotropic material

a. Materials: Create / Isotropic

/ Manual Input.

b. Enteraluminum as the

Material Name.

c. Click Input Properties.

d. Enter10e6 for the elastic

modulus and 0.3 for the

Poisson Ratio.

e. Click OK.

f. Click Apply.

d

e

a

b

c

f

Step 7. Create Element Properties


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Create element properties

a. Properties: Create / 2D /

Shell.

b. Enterplate as the Property

Set Name.

c. Click Input Properties.

d. Click on the Select

Material Icon.

e. Select aluminum as the

material.

f. Enter0.125 for the

thickness.

g. Click OK.

d

f

g

e

a

b

c

Step 7. Create Element Properties


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Select application region

a. Click in the Select

Members box.

b. Screen pick the

surface as shown.

c. Click Add.

d. Click Apply.

b

a

c

d

Step 8. Apply Boundary Conditions


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Create the boundary condition

a. Loads/BCs: Create /

Displacement / Nodal.

b. Enterfixed as the New Set

Name.

c. Click Input Data.

d. Enter for

Translations and

for Rotations.

e. Click OK.

d

e

a

b

c



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Apply the boundary condition

a. Click Select

Application Region.

b. Select the Curve orEdge filter.

c. Select the left edge of

the surface as the

application region.

d. Click Add.

e. Click OK.

f. Click Apply.d

e

b

c

a

f



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The boundary condition

should agree with whats

shown on the right

Step 9. Apply Loads


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Create the load

a. Loads/BCs: Create / Total

Load / Element Uniform.

b. Enterforce as the New Set

Name.

c. Set the Target Element

Type to 2D.

d. Click Input Data.

e. Enter for the Edge

Load.

f. Click OK.

e

f d

b

c

a

Step 9. Apply Loads


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Apply the load

a. Click Select Application

Region.

b. For the application regionselect the right edge of the

surface as shown.

c. Click Add.

d. Click OK.

e. Click Apply.

b

c

d

a

e

Step 9. Apply Loads


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The loads and boundary

condition should agree

with whats shown on the

right.

Step 10. Run Linear Static Analysis


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Analyze the model

a. Analysis: Analyze / Entire

Model / Full Run.

b. Click Solution Type.

c. Choose Linear Static.

d. Click OK.

e. Click Apply.

d

c

a

e

b

Step 11. Post Process with MSC.Patran


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Attach the results file

a. Analysis: Access Results /

Attach XDB / Result

Entities.b. Click Select Results File.

c. Choose the results file

tension_coupon_a.xdb.

d. Click OK.

e. Click Apply.

c

d

a

b

e



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Erase geometry

a. Display: Plot/Erase.

b. Under Geometry click

Erase.c. Click OK.

a

b

c



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Create a Quick Plot

a. Results: Create / Quick

Plot.

b. Select Stress Tensoras the Fringe Result.

c. Select Von Mises as

the Fringe Result

Quantity.

d. Click Apply.

Max Von Mises Stress

= ________

a

b

c

d



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Create a Quick Plot of X

Component Stress

a. Results: Create /

Quick Plot.b. Select Stress Tensor

as the Fringe Result.

c. Select X Component

as the Fringe Result

Quantity.

d. Click Apply.

Max X Stress

= ________

b

c

d

a



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Create a fringe plot of X

Component Stress


Fringe.b. Select Stress Tensor

as the Fringe Result.



Quantity.

d. Click Apply.

Max X Stress = ________

d

a

b

c



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z

By default, MSC.Nastran presents element stressresults in the element coordinate system.

z For the Fringe Plot option, MSC.Patran takes the

MSC.Nastran results and plots them as is.

z For the Quick Plot option, MSC.Patran automatically

transforms the stress results into a projected Patran

global coordinate system first before plotting them.



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Show the element coordinate

systems

a. Reset graphics.

b. Elements: Show /Element / Coord.Sys

c. Rectangular pick all the

elements.

d. Note the various

orientations of the X

direction.e. Click reset graphics.

b

c

e

a



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Create another fringe Plot


Fringe.

b. Select Stress Tensoras the Fringe Result.



Quantity.

d. Click on the Plot

Options Icon.e. Set the coordinate

transformation to CID.

f. Screen pick

coordinate frame 0.

g. Click Apply.

a

b

c

de

f

g



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View the revised results

a. Note the change in

maximum stress.

Max X Stress = _________



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Turn off averaging

a. Set the Averaging

Definition Domain to

None.b. Click Apply.

Max X Stress = ________

a

b

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