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7/29/2019 Tn Coupon Paver
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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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WS8A-3
NAS120, Workshop 8A, May 2006
Copyright 2005 MSC.Software Corporation
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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NAS120, Workshop 8A, May 2006
Copyright 2005 MSC.Software Corporation
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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NAS120, Workshop 8A, May 2006
Copyright 2005 MSC.Software Corporation
50 lb
10 in
4 in
2.0 DIA
Hole
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NAS120, Workshop 8A, May 2006
Copyright 2005 MSC.Software Corporation
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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Copyright 2005 MSC.Software Corporation
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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NAS120, Workshop 8A, May 2006
Copyright 2005 MSC.Software Corporation
Step 2. Create Geometry
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
Step 2 Create Geometry
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Step 2. Create Geometry
Create two more curves
a. Geometry: Create / Curve /
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
Step 2 Create Geometry
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Step 2. Create Geometry
Create a chain curve
a. Geometry: Create / 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
Step 2 Create Geometry
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Copyright 2005 MSC.Software Corporation
Step 2. Create Geometry
Create a circle
a. Geometry: Create / Curve /
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
Step 2 Create Geometry
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Copyright 2005 MSC.Software Corporation
Step 2. Create Geometry
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
Step 2. Create Geometry
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Step 2. Create Geometry
Create two more circles
a. Geometry: Create / Curve /
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
Step 2. Create Geometry
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Step 2. Create Geometry
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
Step 8. Apply Boundary Conditions
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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
Step 8. Apply Boundary Conditions
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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
Step 11. Post Process with MSC.Patran
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Erase geometry
a. Display: Plot/Erase.
b. Under Geometry click
Erase.c. Click OK.
a
b
c
Step 11. Post Process with MSC.Patran
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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
Step 11. Post Process with MSC.Patran
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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
Step 11. Post Process with MSC.Patran
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Create a fringe plot of X
Component Stress
a. Results: Create /
Fringe.b. Select Stress Tensor
as the Fringe Result.
c. Select X Component
as the Fringe Result
Quantity.
d. Click Apply.
Max X Stress = ________
d
a
b
c
Step 11. Post Process with MSC.Patran
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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.
Step 11. Post Process with MSC.Patran
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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
Step 11. Post Process with MSC.Patran
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Create another fringe Plot
a. Results: Create /
Fringe.
b. Select Stress Tensoras the Fringe Result.
c. Select X Component
as 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
Step 11. Post Process with MSC.Patran
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View the revised results
a. Note the change in
maximum stress.
Max X Stress = _________
Step 11. Post Process with MSC.Patran
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Turn off averaging
a. Set the Averaging
Definition Domain to
None.b. Click Apply.
Max X Stress = ________
a
b