workshop 6 frame surface model analysis · 2006. 11. 23. · constrain nodes) for a intermediately...

WS6-1PAT301, Workshop 6, December 2005Copyright© 2005 MSC.Software Corporation

WORKSHOP 6FRAME SURFACE MODEL ANALYSIS


Workshop ObjectivesCreate a finite element model (meshes; connect adjacent elements; apply dead loads, operating loads, and gravity loads; constrain nodes) for a intermediately difficult frame system using MSC.Patran

Perform an analysis of the model, and postprocess the results from the analysis. The results that are looked at are 1) deformation, 2) von Mises stress fringe, and 3) marker tensor using two different coordinate system transformations.

Problem DescriptionCompare stress for different transformationsFrame material: Aluminum with E = 10 x 106 psi, ν = 0.3, and density = 2.61 x 10-4 lbf*sec2/in4

Software VersionMSC.Patran 2005r2MSC.Nastran 2005r2b


Key Concepts and Steps:Database: create a new database with Analysis Code = MSC.Nastran and Analysis Type = StructuralGeometry: open MSC.Patran database to access the surface geometryElements: mesh the surfaces with the Paver mesher, connect the adjacent elements, and determine the aspect ratio of the elementsLoads/BCs: constrain the four corners of the frame, and apply Total load and gravity loading to the modelMaterials: specify an isotropic material for AluminumProperties: create a 2D plate/shell propertyAnalysis: Solution Type = Nastran Linear Static, Solution Sequence = 101, Method = Full RunAnalysis: access analysis results by attaching the XDB file to databaseResults: plot deformation, von Mises stress, and marker tensor results. Use two different coordinate system transformations for the marker tensor results.


Step 1. Open Database surf_create_part2.db

a. File / Open.b. File name:

surf_create_part2. c. Click OK.

a

b

c


Step 2. Create Group for 2D Paver Meshes

a. Group / Create.b. New Group Name:

fem_surfaces.c. Check Make Current.d. Apply.e. Cancel.

a

bc

d e


Step 3. Create Paver Mesh for All Surfaces

a. Elements: Create / Mesh / Surface.

b. Elem Shape: Quad.c. Mesher: Paver.d. Topology: Quad4.e. Click under Surface List and

select all surfaces in the figure, Surface 1:182.

f. Global Edge Length: 1.0.g. Apply.

a

bcd

e

f

g

e


Step 3. Create Paver Mesh for All Surfaces (Cont.)

These are the Paver meshes, onefor each of the 182 surfaces.


Step 5. Equivalence Nodes

a. Elements: Equivalence / All / Tolerance Cube.

b. Equivalencing Tolerance: 0.005.

c. Apply.

a

bc


Step 6. Show Element Free Edges

a. Elements: Verify / Element / Boundaries.

b. Display Type: Free Edges.c. Apply.

a

b

c


Step 9. Verify Elements

a. Elements: Verify / Quad / Aspect.

b. Aspect Ratio: 5.c. Apply.

a

b

c


Step 10. Post Group “all_surfaces”

a. Group / Post.b. Under Select Groups to

Post select all_surfaces.c. Apply.d. Cancel.

a

b

c d


Step 11. Create Dead Load from Engine

a. Change view to Smooth shaded.

b. Zoom into the area as shown in the figure.

a

b

b


Step 11. Create Dead Load from Engine (Cont.)

a. Loads/BCs: Create/ Force/Nodal.

b. Select on New Set Nameand enter dead_load.

c. Input Data.d. Enter for Surf

Load .e. OK.f. Select Application Region.g. Geometry Filter: Geometry.h. Select on Select Geometry

Entities.

a

b

d

ef

g

h

c


a. Select points as shown in the figure.

b. Add.c. OK.d. Apply.


ab

c

a

a


a. Change to the model region shown in the figure.


a



a. Select on New Set Nameand enter dead_load_2.

b. Input Data.c. Enter for Surf

Load .d. OK.e. Select Application Region.f. Geometry Filter: Geometry.g. Select on Select Geometry

Entities.

ab

c

de

f

g





ab

c

a

a



a. The figure should look like the following.b. Zoom out.

a

b


Step 12. Create Operating Engine Static Load

a. Select on New Set Nameand enter op_static_load.

b. Input Data.c. Enter for Surf

Load .d. OK.e. Select Application Region.f. Geometry Filter: Geometry.g. Select on Select Geometry

Entities.

b

c

d

f

g

e a




Step 12. Create Operating Engine Static Load (Cont.)

b

c

aa

a


a. The figure should look like the following.

Step 12. Create Operating Engine Static Load (Cont.)

Although the force directions may appear vertical, they are in fact off angled. Different views can be used to observe this.


Step 13. Create Gravity Load on Frame

a. Loads/BCs: Create/Inertial Load/Element Uniform

b. Enter gravity for New Set Name.

c. Input Data.d. In Trans Accel

enter .e. OK.f. Apply.

a

bc

d

e


Step 14. Create Constraints for the Frame Support

Constrain at the corners of the frame.

a. Loads/BCs: Create/ Displacement/Nodal.

b. Select on New Set Name: and enter fix_base.

c. Select Input Data.d. Enter for

Translations .e. OK.f. Click on Select Application

Region.g. Select Geometry for

Geometry Filter.

a

b

d

e

g

cf


a. Click under Select Geometry Entities.

b. Pick the Pointsicon.

c. Change to wireframe.

d. Select the four points as shown.

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

Step 14. Create Constraints for the Frame Support (Cont.)

f

c

e

ba

d

d


Step 14. Create Constraints for the Frame Support (Cont.)

a. Select on Iso 1 Viewfrom the tool bar.

b. Display / Load/BC/Elem.Props.

c. Unselect Show LBC/El.Prop. Values.

d. Apply.e. Cancel.f. The figure should look

like the following.

a

c

d e

f

b


Step 15. Defining Material

Set aluminum as the material of the frame.

a. Materials: Create / Isotropic / Manual Input.

b. Select on Material Nameand enter aluminum.

c. Select Input Properties.d. Enter:

Elastic Modulus: 10e6.Poisson Ratio: 0.3. Density: 2.61e-4.

e. OK.f. Apply.

a

b

c

d

e


Step 16. Defining Properties for Frame Structure

a. Properties: Create / 2D / Shell.

b. Select Property Set Name and enter al-frame_flange.

c. Select Input Properties.d. Click on Mat Prop Name

select aluminum from Select Material.

e. Thickness: 0.75.f. OK.

a

b

c

d

e

f

d


a. Change view to Front View.b. Click on

Preferences/Picking. c. Change to enclose entire

entity.d. Click on Select Members.e. Select top and bottom

flanges as shown in the figure.

f. Add.g. Apply.

Step 16. Defining Properties for Frame Structure (Cont.)

b

Select flange surfacese

d

g

a

f



a. Preferences / Picking.b. Rectangle/Polygon Picking:

Enclose any portion of entity.

c. Close.d. Select Property Set Name

and enter al_frame_web.e. Select Input Properties.f. Click Mat Prop Name icon

and choose aluminum from Select Material.

g. Thickness: 0.5.h. OK.

a

f

d

e

f

g

h


a. Click on Select Members.b. Select the web

surfaces(between flanges; trimmed surfaces with holes) of the frame as shown in the figure.

c. Add.d. Apply.


a

c

d

Select web surfacesb

Flange surface


a

b

a. Load Cases: Modify.b. Select Default in Select

Load Case to Modify.c. Check that all Loads and

BC’s are selected.d. Cancel.

Step 17. Check Assignment of Loads and BC’s to Load Case

d

c


Step 18. Post Group “fem_surfaces”

a. Group / Post.b. Under Select Groups to Post

select fem_surfaces.c. Apply.d. Cancel.

a


Step 19. Analysis

Run the analysis of the entire model.

a. Analysis: Analyze / Entire Model / Full Run.

b. Select Solution Type.c. Choose LINEAR STATIC for

Solution Type.d. OK.e. Apply.

a

b

c

de


Step 20. Access Results Under Analysis

Attach the .xdb file in order to access the results.

a. Analysis: Access Results/ Attach XDB/Result Entities.

b. Click on Select Results File.

c. Select and attach the file surf_create_part2.xdb.

d. OK.e. Apply.

a

c

d

b

e


Step 21. Deformation Results

Create a deformed shape plot .a. Results: Create /

Deformation.b. Select A1:Static Subcase

under Select Result Case(s).c. Select Displacements,

Translational under Select Deformation Result.

d. Select Display Attributes.e. Click on Model Scale and

set the scale to 0.01.f. Unselect Show

Undeformed.g. Apply.

a

b

c

d

e

g

f


Step 21. Deformation Results (Cont.)

Display shows the deformed shape of the structure.


Step 21. Deformation Results (Cont.)

a. Render Style: Shaded.b. Apply.

a

b


Step 22. Stress Fringe Results

a. Create / Fringe.b. Select Stress Tensor under

Select Fringe Result.c. Select Position…((NON-

LAYERED)).d. Choose At Z1.e. Close.f. Quantity: von Mises.g. Apply.

a

b

c

d

e

f

g



Step 22. Stress Fringe Results (Cont.)


a. Reset graphics.b. Create / Marker / Tensor.c. Select Stress Tensor under

Select Fringe Result.d. Select Position…((NON-

LAYERED)).e. Choose At Z1.f. Close.g. Check only XX and YY.h. Display Attributes.i. Uncheck Show Max/Min

Label.j. Uncheck Show Tensor

Label.k. Plot Options.l. Coordinate Transformation:

As Is.m. Apply.

Step 23. Stress Marker Results

b

c

d

e

f

g

h

ij

k

m

a


a. Zoom in to the figure shown.b. The markers are for XX and

YY components of stress using the coordinate transformation As Is (no transformation).

Step 23. Stress Marker Results (Cont.)


a. Reset graphics.b. Plot Options.c. Coordinate Transformation:

Global.d. Apply.

a

bc

d




b. The only difference between this plot and the previous one is that the coordinate transformation Global was used to create this plot. This means the stress components are displayed in the MSC.Patran global coordinate system.

c. File / Close.

This ends this exercise.


Step 1. Open Database surf_create_part2.dbStep 3. Create Paver Mesh for All Surfaces (Cont.)

/ColorImageDict > /JPEG2000ColorACSImageDict > /JPEG2000ColorImageDict > /AntiAliasGrayImages false /CropGrayImages true /GrayImageMinResolution 300 /GrayImageMinResolutionPolicy /OK /DownsampleGrayImages true /GrayImageDownsampleType /Bicubic /GrayImageResolution 300 /GrayImageDepth -1 /GrayImageMinDownsampleDepth 2 /GrayImageDownsampleThreshold 1.50000 /EncodeGrayImages true /GrayImageFilter /DCTEncode /AutoFilterGrayImages true /GrayImageAutoFilterStrategy /JPEG /GrayACSImageDict > /GrayImageDict > /JPEG2000GrayACSImageDict > /JPEG2000GrayImageDict > /AntiAliasMonoImages false /CropMonoImages true /MonoImageMinResolution 1200 /MonoImageMinResolutionPolicy /OK /DownsampleMonoImages true /MonoImageDownsampleType /Bicubic /MonoImageResolution 1200 /MonoImageDepth -1 /MonoImageDownsampleThreshold 1.50000 /EncodeMonoImages true /MonoImageFilter /CCITTFaxEncode /MonoImageDict > /AllowPSXObjects false /CheckCompliance [ /None ] /PDFX1aCheck false /PDFX3Check false /PDFXCompliantPDFOnly false /PDFXNoTrimBoxError true /PDFXTrimBoxToMediaBoxOffset [ 0.00000 0.00000 0.00000 0.00000 ] /PDFXSetBleedBoxToMediaBox true /PDFXBleedBoxToTrimBoxOffset [ 0.00000 0.00000 0.00000 0.00000 ] /PDFXOutputIntentProfile () /PDFXOutputConditionIdentifier () /PDFXOutputCondition () /PDFXRegistryName () /PDFXTrapped /False

/Description > /Namespace [ (Adobe) (Common) (1.0) ] /OtherNamespaces [ > /FormElements false /GenerateStructure true /IncludeBookmarks false /IncludeHyperlinks false /IncludeInteractive false /IncludeLayers false /IncludeProfiles true /MultimediaHandling /UseObjectSettings /Namespace [ (Adobe) (CreativeSuite) (2.0) ] /PDFXOutputIntentProfileSelector /NA /PreserveEditing true /UntaggedCMYKHandling /LeaveUntagged /UntaggedRGBHandling /LeaveUntagged /UseDocumentBleed false >> ]>> setdistillerparams> setpagedevice

workshop 6 frame surface model analysis · 2006. 11. 23. · constrain nodes) for a intermediately...

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