WORKSHOP 10 SUPPORT BRACKET - FSB Online...WS10-5 NAS120, Workshop 10, May 2006 Copyright©2005 MSC.Software Corporation zSuggested Exercise Steps 1. Create a new database and name

WORKSHOP 10

SUPPORT BRACKET

WS10-2NAS120, Workshop 10, May 2006Copyright© 2005 MSC.Software Corporation


Workshop ObjectivesImport a parasolid part

Mesh the part using TET 4 elements

Re-mesh the part using TET 10 elements

Evaluate the averaged and un-averaged stress results


Problem DescriptionA bracket is constructed from titanium alloy Ti-6Al-4V with the following properties:E = 16 x 106 psi ν =0.31A pressure load of 100 psi is applied to the top face of the support bracket.The bracket is attached with two bolts.Model the bracket with tetrahedron elements.


Suggested Exercise Steps1. Create a new database and name it bracket_tet4.db. 2. Import the parasolid part file support_bracket.xmt. 3. Mesh the part using TET4 elements. Use a global edge length of 0.375 in. 4. Create material and element properties.5. Constrain the two cylindrical holes to react shear loads (x and y translations).6. Constrain the back face to react z loads (z translation).7. Apply 100 psi to the top bracket face.8. Run the finite element analysis using MSC.Nastran.9. Plot displacements and stresses (averaged, un-averaged, and difference). 10. File / save a copy as bracket_tet10.db.11. Close the database and open the bracket_tet10 database.12. Delete the original results file.13. Re-mesh the part with TET10 elements. Use a global edge length of 0.375 in.14. Re-run the analysis.15. Attach the new results file to the database.16. Plot displacements and stresses (averaged, un-averaged, and difference). 17. Compare the TET10 model results with the TET4 model results.18. If time permits, re-mesh the model with TET10 elements using a global edge

length of 0.125 and run the analysis. This finer mesh will generate more accurate stress results than the previous two models.


b c

d

f

g

Step 1. Create New Database

Create a new database called bracket_tet4.db

a. File / New.b. Enter bracket_tet4 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

e


Step 2. Import Parasolid File

Import the Parasolid Filea. File: Import.b. Set the object to model

and the source to Parasolid.xmt.

c. Select support_bracket.xmt.

d. Click Apply.e. Click OK to Parasolid

Transmit File Import Summary

ab

c

d


Step 3. Create Mesh

Create a solid mesha. Elements: Create / Mesh

/ Solid.b. Set the topology to

TET4.c. Select the entire solid.d. Enter 0.375 for the

Global Edge Length.e. Click Apply.

a

b

c

d

e


Step 4. Create Material and Element Properties

Create an isotropic materiala. Materials: Create / Isotropic

/ Manual Input.b. Enter Ti-6Al-4V as the

Material Name.c. Click Input Properties.d. Enter 16e6 for the Elastic

Modulus and 0.31 for the Poisson Ratio.

e. Click OK. f. Click Apply.

d

e

a

c

b

f



Create element propertiesa. Properties: Create / 3D /

Solid.b. Enter bracket_prop as the

Property Set Name.c. Click Input Properties.d. Click on the Select

Material Icon.e. Select Ti-6Al-4V as the

material.f. Click OK.

f

e

d

a

b

c


Apply the element propertiesa. Click in the Select

Members box.b. Rectangular pick all

elements as shown.c. Click Add.d. Click Apply.

b


ac

d


Step 5. Constrain Bolt Holes

Create a boundary conditiona. Loads/BCs: Create /

Displacement / Nodal.b. Enter bolt_hole as the

New Set Name.c. Click Input Data.d. Enter <0,0, > for

Translations e. Click OK.

d

e

b

c

a


Apply the boundary conditiona. Click Select

Application Region.b. For the Geometry

Filter select Geometry.

c. Click on Iso 2 ViewIcon.

d. Click on the Smooth Shaded View Icon.

e. Set the Selection Filter to Surface or Face and shift click to select the surfaces of both bolt holes.

f. Click Add.g. Click OK. h. Click Apply.

Step 5. Constrain Bolt Holes

g

f

b

cd

e

a

h


Step 6. Constrain the Back Face

Create a boundary conditiona. Loads/BCs: Create /

Displacement / Nodal.b. Enter back_face as the

New Set Name.c. Click Input Data.d. Enter < , ,0> for

Translations e. Click OK.

d

e

a

b

c


Apply the boundary conditiona. Click Select



c. Select the Back Face.d. Click Add.e. Click OK. f. Click Apply.

ae

f

d

b

c

d

Step 6. Constrain the Back Face


Step 7. Create Pressure Load

Create the pressure loada. Loads/BCs: Create /

Pressure / Element Uniform.

b. Enter top_pressure as the New Set Name.

c. Click Input Data.d. Enter 100 for the Pressure.e. Click OK.

e

d

a

b

c


Apply the pressure loada. Click Select



c. Select the top surface of the bracket.

d. Click Add.e. Click OK. f. Click Apply.

Step 7. Create Pressure Load

b

d

e

c

af


Step 8. 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


Step 9. Plot Displacements and Stresses

Attach the results filea. Analysis: Access Results /

Attach XDB / Result Entities.b. Click Select Results File.c. Choose the results file

bracket_tet4.xdb.d. Click OK. e. Click Apply.

a

b

c

e

d



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. Select Displacements, Translational as the Deformation Result.

e. Click Apply.

Maximum Averaged Stress:

__________________

Maximum Displacement:

___________________

a

d

c

e

b



Create a fringe plota. Results: Create /

Fringe.b. Select Stress

Tensor as the Fringe Result.

c. Select Von Mises as the Fringe Result Quantity.

d. Click on the Plot Options Icon.

e. Set the Averaging domain to none.

f. Click Apply.

a

d

c

b

Maximum Un-averaged Stress:

__________________

e

f




Fringe.b. Select the Plot

Options tool.c. Set the Averaging

domain to All Entities and the Method to Difference.

d. Click Apply.

Maximum Stress Difference:

_________________

a

d

c

b


Step 10. Save a Copy

Save a copy of the filea. File: Save a Copy.b. Type bracket_tet10 as the

file name.c. Click Save.

a

b c


Step 11. Open the New Database

Close the original file and open the new file

a. File: Close.b. File: Open.c. Select the file:

bracket_tet10.db.d. Click OK.

ab

c

d


Step 12. Delete Old Results File

Delete XDB attachmenta. Analysis: Delete / XDB

Attachment.b. Select the

bracket_tet4.xdbattachment

c. Click Apply.d. Choose Yes to delete

the attachment.

a

b

cd


Step 13. Re-Mesh the Part

Create a solid mesha. Elements: Create / Mesh

/ Solid.b. Set the topology to

TET10.c. Select the entire solid.d. Enter 0.375 for the

Global Edge Length.e. Click Apply.f. Choose Yes to delete

the existing mesh.

f

a

b

c

d

e


Step 14. Run Linear Static Analysis

Analyze the modela. Analysis: Analyze /

Entire Model / Full Run.

b. Change the job name to bracket_tet10.

c. Click Apply.

a

b

c


Step 15. Attach New Results File

Attach the results filea. Analysis: Access Results /

Attach XDB / Result Entities.

b. Click Select Results File.c. Choose the results file

bracket_tet10.xdb.d. Click OK. e. Click Apply.

a

b

c

e

d



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. Select Displacements, Translational as the Deformation Result.

e. Click Apply.

Maximum Averaged Stress:

__________________

Maximum Displacement:

___________________

c

a

d

c

e

b




Fringe.b. Select Stress

Tensor as the Fringe Result.

c. Select Von Misesas the Fringe Result Quantity.

d. Click on the Plot Options Icon.

e. Set the Averaging domain to none.

f. Click Apply.

Maximum Un-averaged Stress:

__________________

a

d

c

be

f



Maximum Stress Difference:

__________________


Fringe.b. Select the Plot

Options tool.c. Set the Averaging

domain to All Entities and the Method to Difference.

d. Click Apply.

a

d

c

b


Documents

WORKSHOP 10 SUPPORT BRACKET - FSB Online...WS10-5 NAS120, Workshop 10, May 2006 Copyright©2005 MSC.Software Corporation zSuggested Exercise Steps 1. Create a new database and name