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7/29/2019 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
Step 11 Create Dead Load from Engine (Cont )
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a. Select points as shown inthe figure.
b. Add.
c. OK.
d. Apply.
Step 11. Create Dead Load from Engine (Cont.)
a
b
c
a
a
Step 11 Create Dead Load from Engine (Cont )
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a. Change to the model regionshown in the figure.
Step 11. Create Dead Load from Engine (Cont.)
a
Step 11 Create Dead Load from Engine (Cont )
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Step 11. Create Dead Load from Engine (Cont.)
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
Step 11. Create Dead Load from Engine (Cont.)
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Step 11. Create Dead Load from Engine (Cont.)
a. Select points asshown in the figure.
b. Add.
c. OK.
d. Apply.
ab
c
a
a
Step 11. Create Dead Load from Engine (Cont.)
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Step 11. Create Dead Load from Engine (Cont.)
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
Step 16. Defining Properties for Frame Structure (Cont.)
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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
Step 16. Defining Properties for Frame Structure (Cont.)
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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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a. The figure should look like
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).
Step 23. Stress Marker Results (Cont.)
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a. Reset graphics.
b. Plot Options.
c. Coordinate Transformation:
Global.
d. Apply.
a
b
c
d
Step 23. Stress Marker Results (Cont.)
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a. The figure should look like
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.
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