06 frame surf analy pat301

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PAT301, Workshop 6, December 2005

Copyright 2005 MSC.Software Corporation

WORKSHOP 6

FRAME SURFACE MODEL ANALYSIS


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z Workshop Objectives

z Create a finite element model (meshes; connect adjacentelements; apply dead loads, operating loads, and gravity loads;constrain nodes) for a intermediately difficult frame systemusing MSC.Patran

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

z Problem Descriptionz Compare stress for different transformations

z Frame material: Aluminum with E = 10 x 106 psi, = 0.3, anddensity = 2.61 x 10-4 lbf*sec2/in4

z Software Version

z MSC.Patran 2005r2

z MSC.Nastran 2005r2b


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z Key Concepts and Steps:

z Database: create a new database with Analysis Code = MSC.Nastran and

Analysis Type = Structural

z Geometry: open MSC.Patran database to access the surface geometry

z Elements: mesh the surfaces with the Paver mesher, connect theadjacent elements, and determine the aspect ratio of the elements

z Loads/BCs: constrain the four corners of the frame, and apply Total loadand gravity loading to the model

z

Materials: specify an isotropic material for Aluminumz Properties: create a 2D plate/shell property

z Analysis: Solution Type = Nastran Linear Static, Solution Sequence =101, Method = Full Run

z Analysis: access analysis results by attaching the XDB file to database

z Results: plot deformation, von Mises stress, and marker tensor results.Use two different coordinate system transformations for the marker tensorresults.


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Step 1. Open Database surf_create_part2.db

a. File / Open.

b. File name:surf_create_part2.

c. Click OK.

a

b

c


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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


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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 underSurface Listand

select all surfaces in thefigure, Surface 1:182.

f. Global Edge Length: 1.0.

g. Apply.

a

bc

d

e

f

g

e


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

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

S


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Step 5. Equivalence Nodes

a. Elements: Equivalence / All /Tolerance Cube.

b. Equivalencing Tolerance:

0.005.

c. Apply.

a

b

c

St 6 Sh El t F Ed


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Step 6. Show Element Free Edges

a. Elements: Verify / Element /Boundaries.

b. Display Type: Free Edges.

c. Apply.

a

b

c

St 9 V if El t


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Step 9. Verify Elements

a. Elements: Verify / Quad /

Aspect.

b. Aspect Ratio: 5.

c. Apply.

a

b

c

Step 10 Post Gro p all s rfaces


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Step 10. Post Group all_surfaces

a. Group / Post.

b. UnderSelect Groups to

Postselect all_surfaces.

c. Apply.

d. Cancel.

a

b

c d

Step 11 Create Dead Load from Engine


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Step 11. Create Dead Load from Engine

a. Change view to Smoothshaded.

b. Zoom into the area as

shown in the figure.

a

b

b

Step 11 Create Dead Load from Engine (Cont )


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

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

b. Select on New Set Name

and enterdead_load.

c. Input Data.

d. Enter forSurf

Load .e. OK.

f. Select Application Region.

g. Geometry Filter: Geometry.

h. Select on Select Geometry

Entities.

a

b

d

ef

g

h

c



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a. Select points as shown inthe figure.

b. Add.

c. OK.

d. Apply.


a

b

c

a

a



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a. Change to the model regionshown in the figure.


a



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a. Select on New Set Nameand enterdead_load_2.

b. Input Data.

c. Enter forSurf

Load .

d. OK.

e. Select Application Region.

f. Geometry Filter: Geometry.

g. Select on Select Geometry

Entities.

a

b

c

de

f

g



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a. Select points asshown in the figure.

b. Add.

c. OK.

d. Apply.

ab

c

a

a



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a. The figure should look like the following.

b. Zoom out.

a

b

Step 12. Create Operating Engine Static Load


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p p g g

a. Select on New Set Nameand enterop_static_load.

b. Input Data.

c. Enter forSurf

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.)


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a. Select points as

shown in the figure.

b. Add.

c. OK.

d. Apply.

p p g g ( )

b

c

a

a

a

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


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a. The figure should look like

the following.

p p g g ( )

Although the force directions mayappear vertical, they are in fact off

angled. Different views can be

used to observe this.

Step 13. Create Gravity Load on Frame


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a. Loads/BCs: Create/InertialLoad/Element Uniform

b. Entergravity forNew 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


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Constrain at the corners of the

frame.a. Loads/BCs: Create/

Displacement/Nodal.

b. Select on New Set Name:

and enterfix_base.

c. Select Input Data.

d. Enter forTranslations .

e. OK.

f. Click on Select Application

Region.

g. Select Geometry for

Geometry Filter.

a

b

d

e

g

c

f

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


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a. Click underSelect

Geometry Entities.b. Pick the Points

icon.

c. Change to

wireframe.

d. Select the four

points as shown.e. Add.

f. OK.

g. Apply.

f

c

e

ba

d

d

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


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a. Select on Iso 1 View

from the tool bar.b. Display /

Load/BC/Elem.Props.

c. Unselect Show

LBC/El.Prop. Values.

d. Apply.

e. Cancel.

f. The figure should looklike the following.

a

c

d e

f

b

Step 15. Defining Material


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Set aluminum as the material of theframe.

a. Materials: Create / Isotropic /

Manual Input.

b. Select on Material Name

and enteraluminum.

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


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a. Properties: Create / 2D /Shell.

b. Select Property Set

Name and enteral-

frame_flange.

c. Select Input Properties.

d. Click on Mat Prop Nameselect aluminum from

Select Material.

e. Thickness: 0.75.

f. OK.

a

b

c

d

e

f

d

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


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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 bottomflanges as shown in the

figure.

f. Add.

g. Apply.

b

Select flange surfacese

d

g

a

f



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

Enclose any portion of

entity.

c. Close.

d. Select Property Set Name

and enteral_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



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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

Step 17. Check Assignment of Loads and BCs to Load Case


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a

b

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

Load Case to Modify.

c. Check that all Loads and

BCs are selected.

d. Cancel.

d

c

Step 18. Post Group fem_surfaces


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a. Group / Post.

b. UnderSelect Groups to Post

select fem_surfaces.

c. Apply.

d. Cancel.

a

Step 19. Analysis


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Run the analysis of the entiremodel.

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


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Attach the .xdb file in order toaccess the results.

a. Analysis: Access Results/

Attach XDB/Result Entities.

b. Click on Select Results

File.

c. Select and attach the filesurf_create_part2.xdb.

d. OK.

e. Apply.

a

c

d

b

e

Step 21. Deformation Results


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Create a deformed shape plot .

a. Results: Create /

Deformation.

b. Select A1:Static Subcase

underSelect Result Case(s).

c. Select Displacements,

Translational underSelectDeformation 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.)


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Display shows thedeformed shape of the

structure.

Step 21. Deformation Results (Cont.)


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a. Render Style: Shaded.

b. Apply.

a

b

Step 22. Stress Fringe Results


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a. Create / Fringe.

b. Select Stress Tensorunder

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.)


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the following.

Step 23. Stress Marker Results


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a. Reset graphics.

b. Create / Marker / Tensor.

c. Select Stress Tensorunder

Select Fringe Result.

d. Select Position((NON-

LAYERED)).

e. Choose At Z1.

f. Close.

g. Check only XX andYY.

h. Display Attributes.

i. Uncheck Show Max/Min

Label.

j. Uncheck Show Tensor

Label.k. Plot Options.

l. Coordinate Transformation:

As Is.

m. Apply.

b

c

d

e

f

g

h

ij

k

m

a

Step 23. Stress Marker Results (Cont.)


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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).



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a. Reset graphics.

b. Plot Options.

c. Coordinate Transformation:

Global.

d. Apply.

a

b

c

d



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the following.

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 stresscomponents are displayed in

the MSC.Patran global

coordinate system.

c. File / Close.

This ends this exercise.

06 frame surf analy pat301

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