workshop 8a tension coupon - unizg.hr
TRANSCRIPT
WORKSHOP 8A
TENSION COUPON
WS8A-2NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
WS8A-3NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Workshop ObjectivesBuild the tension coupon geometry
Control the mesh by using techniques discussed in class
Compare FEA stress results to theoretical results
From “Stress Concentration Factors” by R. E. Peterson, Figure 86:
σmax = 432 psi
WS8A-4NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Problem DescriptionA tension coupon is constructed from aluminum with E = 10 x 106
psi and n = 0.3
The coupon thickness is 0.125 in
An edge load of 50 lb is applied to the tension coupon
WS8A-5NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
50 lb
10 in
4 in
2.0 DIA Hole
WS8A-6NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
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.
WS8A-7NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
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
WS8A-8NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 2. Create Geometry
Create the first curve.a. Geometry: Create / Curve /
XYZ.b. Enter <0 4 0> for the Vector
Coordinate List.c. Enter [0 0 0] for the Origin
Coordinate List.d. Click Apply.
a
b
c
d
WS8A-9NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 2. Create Geometry
Create the second curve by translating the first curve.
a. Geometry: Transform / Curve / Translate.
b. Enter <10 0 0> for the Direction Vector.
c. Click in the Curve List box and screen pick the first curve.
a
b
c
WS8A-10NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 2. Create Geometry
Create two more curvesa. 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
WS8A-11NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 2. Create Geometry
Create a chain curvea. Geometry: Create / Curve /
Chain.b. Rectangular pick all four
curves.c. Click Apply.d. When the message box
appears, choose Yes to delete the original curves.
a
b
c
d
WS8A-12NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 2. Create Geometry
Create a circlea. 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
WS8A-13NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 2. Create Geometry
Create a trimmed surfacea. 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, choose Yes to delete the original curves.
h. Click the Refresh Graphics icon
a
b
d
c
e
f
g
h
WS8A-14NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 2. Create Geometry
Create two more circlesa. 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 a
circle with a radius of 1.2.
a
b
d
c
WS8A-15NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
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.
ab
c
d
WS8A-16NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 3. Create Mesh Seeds
Create a uniform mesh seeda. Elements: Create / Mesh
Seed / Uniform.b. Enter 48 for the Number of
Elements.c. Click in the Curve List box.d. Select the Curve or Edge
element filter. e. Rectangular pick the two
circles and the edge of the hole.
a
b
c
d
e
WS8A-17NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 3. Create Mesh Seeds
Create a biased mesh seeda. Elements: Create / Mesh
Seed / Two Way Bias.b. Enter 20 for the Number of
Elements.c. Enter 0.25 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
bc
d
f
e
WS8A-18NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 4. Create Mesh
Create a finite element mesha. 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. Enter 1.0 as the value for Global Edge Length.
f. Click Apply.
a
b
cd
f
e
WS8A-19NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 5. Verify Mesh
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
WS8A-20NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 5. Verify Mesh
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
WS8A-21NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 6. Create Material Properties
Create an isotropic materiala. Materials: Create / Isotropic
/ Manual Input.b. Enter aluminum as the
Material Name.c. Click Input Properties.d. Enter 10e6 for the elastic
modulus and 0.3 for the Poisson Ratio.
e. Click OK. f. Click Apply.
d
e
a
b
c
f
WS8A-22NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 7. Create Element Properties
Create element propertiesa. Properties: Create / 2D /
Shell.b. Enter plate as the Property
Set Name.c. Click Input Properties.d. Click on the Select
Material Icon.e. Select aluminum as the
material.f. Enter 0.125 for the
thickness.g. Click OK.
d
f
g
e
a
b
c
WS8A-23NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 7. Create Element Properties
Select application regiona. Click in the Select
Members box.b. Screen pick the
surface as shown.c. Click Add.d. Click Apply.
b
a
c
d
WS8A-24NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 8. Apply Boundary Conditions
Create the boundary conditiona. Loads/BCs: Create /
Displacement / Nodal.b. Enter fixed as the New Set
Name.c. Click Input Data.d. Enter <0 0 0> for
Translations and <0 0 0>for Rotations.
e. Click OK.
d
e
a
b
c
WS8A-25NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 8. Apply Boundary Conditions
Apply the boundary conditiona. Click Select
Application Region.b. Select the Curve or
Edge 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
WS8A-26NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 8. Apply Boundary Conditions
The boundary condition should agree with what’s shown on the right
WS8A-27NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 9. Apply Loads
Create the loada. Loads/BCs: Create / Total
Load / Element Uniform.b. Enter force as the New Set
Name.c. Set the Target Element
Type to 2D.d. Click Input Data.e. Enter <50 0 0> for the Edge
Load.f. Click OK.
e
f d
b
c
a
WS8A-28NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Apply the loada. Click Select Application
Region.b. For the application region
select the right edge of the surface as shown.
c. Click Add.d. Click OK.e. Click Apply.
Step 9. Apply Loads
b
c
da
e
WS8A-29NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 9. Apply Loads
The loads and boundary condition should agree with what’s shown on the right.
WS8A-30NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 10. Run Linear Static Analysis
Analyze the modela. 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
WS8A-31NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 11. Post Process with MSC.Patran
Attach the results filea. 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
WS8A-32NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 11. Post Process with MSC.Patran
Erase geometrya. Display: Plot/Erase.b. Under Geometry click
Erase.c. Click OK.
a
b
c
WS8A-33NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 11. Post Process with MSC.Patran
Create a Quick Plota. Results: Create / Quick
Plot.b. Select Stress Tensor
as the Fringe Result.c. Select Von Mises as
the Fringe Result Quantity.
d. Click Apply.
Max Von Mises Stress = ________
a
b
c
d
WS8A-34NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 11. Post Process with MSC.Patran
Create a Quick Plot of X Component Stress
a. Results: Create / Quick Plot.
b. Select Stress Tensor as the Fringe Result.
c. Select X Componentas the Fringe Result Quantity.
d. Click Apply.
Max X Stress = ________
b
c
d
a
WS8A-35NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 11. Post Process with MSC.Patran
Create a fringe plot of X Component Stress
a. Results: Create / Fringe.
b. Select Stress Tensor as the Fringe Result.
c. Select X Componentas the Fringe Result Quantity.
d. Click Apply.
Max X Stress = ________
d
a
b
c
WS8A-36NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 11. Post Process with MSC.Patran
By default, MSC.Nastran presents element stress results in the element coordinate system.
For the Fringe Plot option, MSC.Patran takes the MSC.Nastran results and plots them as is.
For the Quick Plot option, MSC.Patran automatically transforms the stress results into a projected Patranglobal coordinate system first before plotting them.
WS8A-37NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 11. Post Process with MSC.Patran
Show the element coordinate systems
a. Reset graphics.b. Elements: Show /
Element / Coord.Sysc. Rectangular pick all the
elements.d. Note the various
orientations of the X direction.
e. Click reset graphics.
b
c
e
a
WS8A-38NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 11. Post Process with MSC.Patran
Create another fringe Plota. Results: Create /
Fringe.b. Select Stress Tensor
as 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
WS8A-39NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 11. Post Process with MSC.Patran
View the revised resultsa. Note the change in
maximum stress.
Max X Stress = _________
WS8A-40NAS120, Workshop 8A, May 2006Copyright© 2005 MSC.Software Corporation
Step 11. Post Process with MSC.Patran
Turn off averaginga. Set the Averaging
Definition Domain to None.
b. Click Apply.
Max X Stress = ________
a
b