workshop 8b tension coupon - unizg.hr

WORKSHOP 8B

TENSION COUPON


Workshop ObjectivesPractice creating and editing geometry

Practice mesh seeding and iso meshing techniques.


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.


b c

d

e

f

g

Step 1. Create New Database

Create a new database called tension_coupon_b.db

a. File / New.b. Enter

tension_coupon_b 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


Step 2. Create Geometry

Create the first curvea. 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


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



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



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



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



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

f

g

h

e



Create two more curvesa. Geometry: Create / Curve /

XYZ.b. Enter <0 4 0> for the

Vector Coordinate List.c. Enter [3 0 0] for the Origin

Coordinate List.d. Click Apply.e. Repeat this procedure with

[7 0 0] as the Origin Coordinate List.

a

b

d

c



Break the surface into 3 surfacesa. Geometry: Edit / Surface /

Break.b. Set the Option to Curve.c. Screen pick the trimmed

surface. d. Screen pick the left curve

as shown.e. When the message box

appears, choose Yes to delete the original surfaces.

f. Screen pick the new trimmed surface, and pick the right curve to break it.

a

b

cd

e

f



Create additional pointsa. Turn Point size on.b. Geometry: Create / Point /

Interpolate.c. Set the Option to Curve.d. Screen pick the top of the

surface above the circle as shown.

e. Repeat the procedure by screen picking each of the other three edges surrounding the circle.

a

d


b

c


Create four curvesa. Geometry: Create / Curve /

Point.b. Screen pick the point

above the center of the circle as shown.

c. Screen pick the point below the center of the circle to create a curve.

d. Repeat the procedure by screen picking opposite points surrounding the circle to create four curves as shown.

a

b

c



Break the magenta surfacea. Geometry: Edit / Surface /

Break.b. Screen pick the magenta

surface.c. Screen pick the vertical

curve. d. When the message box

appears, choose Yes to delete the original surfaces.

e. Repeat the procedure to break two surfaces with the horizontal curve.

f. Repeat the procedure to break two surfaces with a diagonal curve.

g. Repeat the procedure to break two surfaces with the other diagonal curve.

a

bc

e

f

g

The original magenta surface has been broken into 8 green surfaces.

d



Break the rectangular surfacesa. Geometry: Edit / Surface /

Break.b. Set the option to Point.c. Screen pick the left

rectangular surface as shown.

d. Screen pick the point on the edge of the rectangular surface as shown.

e. When the message box appears, choose Yes to delete the original surfaces.

f. Repeat the procedure by screen picking the other rectangular surface and the point on the edge of the surface.

e

a

bc

d f



Delete excess curvesa. Turn Point size offb. Geometry: Delete / Curve. c. Rectangular pick all of the

curves as shown.d. Click Apply.e. Click Refresh graphics.

b

a

c

d

e



Step 3. Create Mesh Seeds

Create a uniform mesh seeda. Elements: Create / Mesh

Seed / Uniform.b. Enter 3 for the Number of

Elements.c. Click in the Curve List box.d. Screen pick each of the

four edges on the left and right sides of the circle as shown.

a

b

c

d



a

bc

d

Create a biased mesh seeda. Elements: Create / Mesh

Seed / One Way Bias.b. Enter 6 for the Number of

Elements.c. Enter 4 for L2/L1.

Depending on the direction of the arrow, you may have to enter 0.25 (or-4) to get the correct biasing.

d. Click on the Curve List box. e. Screen pick the four

remaining edges on the circle.

f. Screen pick the horizontal edge to the right of the circle.

e f


The mesh seeds should agree with the picture on the right.



Step 4. Create Mesh

Create a finite element mesha. Elements: Create / Mesh /

Surface.b. Set the Element Shape to

Quad, Mesher to IsoMesh, and Topology to Quad4.

c. Click in the Surface List box.

d. Rectangular pick the surfaces as shown.

e. Enter 0.5 as the value for Global Edge Length.

f. Click Apply.

a

b

c

f

e

d


Step 4. Create Mesh

Equivalence the modela. Elements: Equivalence /

All / Tolerance Cube. b. Click Apply.

a

b


Step 5. Verify Mesh

Verify the quality of the finite elements

a. Elements: Verify / Quad / All.

b. Click Apply.c. Review the summary table.

a

b

c


Step 5. Verify Mesh

Perform specific quality tests on the elements.

a. Elements: Verify / Quad / Aspect.

b. Click Apply.c. Review the fringe plot.d. Repeat for Warp, Skew,

and Taper tests.e. Reset Graphics

c

a

b

d

e

e


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


d

f

g

e

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.

a

b

c


Step 7. Create Element Properties

Select application regiona. Click in the Select

Members box.b. Rectangular pick

the surfaces as shown.

c. Click Add.d. Click Apply.

b

a

c

d


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



Apply the boundary conditiona. Click Select

Application Region.b. Select the Curve or

Edge filter.c. Select the bottom left

edge of the surface.d. Click Add.e. Select the top left edge

of the surface.f. Click Add.g. Click OK. h. Click Apply.

g

b

c

e

d f

a

h



The boundary condition should agree with what’s shown on the right


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

fd

b

c

a


Apply the loada. Click Select

Application Region.b. For the application

region select the right edge of the top right surface as shown.

c. Click Add.d. Select the right edge of

the bottom right surface.

e. Click Add.f. Click OK.g. Click Apply.

Step 9. Apply Loads

b

c

f

ed

ag


Step 9. Apply Loads

The loads and boundary condition should agree with what’s shown on the right.


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.

a

e

b

d

c


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_b.xdb.d. Click OK. e. Click Apply.

a

b

c

e

d



Erase geometrya. Display: Plot/Erase.b. Under Geometry click

Erase.c. Click OK.

a

b

c



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.e. Record the maximum X

component stress.

Max X Stress = ________

a

b

c

d



a

b

c

d

g

h

fe

Turn off averaginga. Results: Create /

Fringe.b. Select Stress Tensor

as the Fringe Result.c. Select X Component

as the result quantity.d. Click on the Plot

Options Icon.e. Change the

Coordinate Transformation to CID.

f. Select Coordinate 0.g. Change the Averaging

Definition Domain to None.

h. Click Apply.

Max X Stress = ________

f

workshop 8b tension coupon - unizg.hr

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