15 Stiffened Plate PAT301

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PAT301, Workshop 16, December 2005

Copyright 2005 MSC.Software Corporation

WORKSHOP 16STIFFENED PLATE


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Workshop Objectives

Create a model of a plate with two types of stiffeners. For onetype of stiffener the cross-section properties, e.g. area, areprovided. For the other type of stiffener the MSC.Patran BeamLibrary is used to obtain the cross-section properties. Themodel is finished, i.e. create constraints and pressure loading.

An analysis of the model is performed, and the results viewedusing MSC.Nastran and MSC.patran.

Problem Description

Show the stress for the plate or beam elements on thedeformed shape of the model

All material: Aluminum with E = 10 x 106 psi and = 0.3

Pressure on piston = 5 psi

Software Version

MSC.Patran 2005r2

MSC.Nastran 2005r2b


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Key Concepts and Steps:

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

and Analysis Type = Structural

Geometry: create the surfaces that are to represent the plate

Elements: mesh the surfaces with plate elements, and mesh selectedges of the surfaces with bar elements

Loads/BCs: pin constrain two opposing edges of the plate, and apply apressure to the surface of the plate

Materials: specify an isotropic material for Aluminum

Properties: create a 2D plate property for the plate, and a 1D beamproperty for each of the two types of stiffeners

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

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

Results: plot von Mises stress for plate elements, bar stress for barelements, and displacement results for each


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CREATE NEW DATABASE

Create a new database called

stiffened_plate.db.

a. File / New.

b. Enter stiffened_plate 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

b c

d

e

f

g


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Step 1. Geometry: Create / Surface / XYZ

Create the surface.

a. Geometry: Create /

Surface / XYZ.

b. Enter for the

Vector Coordinate List.

c. Click Apply.

a

b

c


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Step 1. Geometry: Create / Curve / XYZ

Turn on the Show Parametric

Direction feature.a. Display / Geometry...

b. Check the Show

Parametric Direction

box.

c. Click Apply.

d. Click Cancel.

b

c d

a


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Step 1. Geometry: Edit / Surface / Break

Break the surface in the

u-direction.

a. Geometry: Edit / Surface/ Break.

b. Change the Option to

Parametric.

c. Choose Constant u

Direction as the Break

Direction.d. Enter 0.5 as the Break

Curve value.

e. Screen pick the surface

created earlier.

f. AnswerYes when the

question Do you wish todelete the original

surfaces? appears.

a

b

c

d

e

e

S 1 G Edi / S f / B k


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Step 1. Geometry: Edit / Surface / Break

Break the surfaces again in the

u-direction.

a. Screen pick the bottomsurface.

b. AnswerYes when the

question Do you wish to

delete the original

surfaces? appears.

c. Screen pick the topsurface.

d. AnswerYes when the

question Do you wish to

delete the original

surfaces? appears.

e. Click on the Show labels

icon.

e

c

a

St 2 Fi it El t C t / M h / S f


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Step 2. Finite Elements: Create / Mesh / Surface

Generate plate elements usingIsoMesh.

a. Elements: Create / Mesh/ Surface.

b. Select Quad as theElement Shape.

c. Select IsoMesh as theMesher.

d. Select Quad4 Element

Topology.

e. Select all the surfaces.

f. Enter 2.0 as the GlobalEdge Length.

g. Click Apply.

h. Click on Hide labels icon.

a

h

bc

g

d

e

f

St 2 Fi it El t C t / M h / C


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Step 2. Finite Elements: Create / Mesh / Curve

Generate bar elements along the

longitudinal edges of the

surfaces.a. Elements: Create / Mesh /

Curve.

b. Choose Bar2 as the

element Topology.

c. Select 5 horizontal

surface edges.d. Click Apply.

a

b

c

d

Step 2 Finite Element: Equivalence / All / Tolerance Cube


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Step 2. Finite Element: Equivalence / All / Tolerance Cube

Equivalence the model nodes to

connect elements along surface

edges.a. Elements: Equivalence /

All / Tolerance Cube.

b. Click Apply.

a

b

Step 3 Material: Create / Isotropic / Manual Input


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Step 3. Material: Create / Isotropic / Manual Input

Define a material for the model.

a. Material: Create / Isotropic /

Manual Input.b. Type in alum for the Material

Name.

c. Click on the Input Properties

button to bring up the Input

Options window.

d. Enter 10E6 for the ElasticModulus and 0.3 for Poisson

Ratio.

e. Enter 0.101 for the Density.

f. Click OK to return to the main

material menu.

g. Click Apply.

d

e

f

a

b

g

c

Step 3 Element Properties: Create / 2D / Shell


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Step 3. Element Properties: Create / 2D / Shell

Create element properties for the

plate elements.

a. Properties: Create / 2D /Shell.

b. Enter plate as the Property

Set Name.


button.

d. Click on the Matl Prop Nameicon.

e. Click on the alum in the

Select Existing Material

window.

f. Enter 0.1 as the thickness.

g. Click OK.h. Select all surfaces for the

Application Region.

i. Click Add.

j. Click Apply.

d

f

e

g

a

b

c

h

i

j

Step 3 Element Properties: Create / 1D / Beam


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Step 3. Element Properties: Create / 1D / Beam

Create element properties for the hat

stiffeners.

a. Properties: Create / 1D /Beam.

b. Enter hat_stiffeneras the

Property Set Name.


button.

d. Click on the Matl Prop Nameicon.

e. Click on alum in the Select

Existing Material window.

f. Enter for the Bar

Orientation.

g. Enter for the offsetat Node 1 and Node 2.

d

f

e

g

a

b

c



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a


a. Scroll down the propertieswindow to enter the followingsection properties:

Area = 0.504Inertia 1,1 = 0.174

Inertia 2,2 = 0.143

Torsion Constant = 0.0016

b. Scroll further down to enterstress recovery pointcoordinates as shown to the

right.c. Click OK.

b

c



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a. Click on Select Members,

then click on the beamelement filter.

b. For the application region

select three rows of bar

elements.

c. Click Add.

d. Click Apply.

a

c

d

a



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Next, create element properties forthe I-beam stiffeners.

a. Properties: Create / 1D /

Beam.b. Enter i_stiffeneras the

Property Set Name.

c. Click on the InputProperties button.

d. Click on the Matl Prop

Name icon.e. Click on alum in SelectExisting Material window.

f. Enter for BarOrientation.

g. Enter for theOffset at both nodes.

h. Click on Beam Library icon.

d

f

g

e

h

a

b

c



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a. Enter i_section for New

Section Name.

b. Select the I-Beam shape

option.

c. Enter dimensions for the I-

Beam as shown.

d. Click on Calculate/Display

to view the cross section.

e. Click OK.

f. Click OK again.

g. Select the curve or edge

filter.

h. For the application region,

select the top and bottom

edges of the plate.

i. Click Add.

j. Click Apply.

a

b

c

d

e

g

h

i

j

Step 3. Viewing / Angles


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p g g

Change the viewing angle.

a. Viewing/ Angles...

b. Select Model Absolute.

c. Input 23.0 34.0 0.0 as

the Angles.

d. Click Apply.

e. Click Cancel

b

c

d e

a

Step 4. Display / Load/BC/Elem Props


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p p y p

Change the display settings to show beam

offset.

a. Display / Load/BC/Elem Props...

b. Change Beam Display from 1D line

to 1D line + offsets

c. Click Apply.

d. Change Beam Display to 2D Mid-

Span + Offsets

e. Click Apply.

f. Change Beam Display to 3D Full-

Span + Offsets.

g. Change Beam Display to 3D Full-

Span + Offsets + Equivalent I.

h. Click Apply.

i. Click Cancel.

b

c

d

f

i

g

a



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1D + Offsets

2D + Offsets 3D + Offsets

1D

3D + Offsets + Equivalent I

Step 4. Element Properties: Show


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Verify the orientation of the

hat sections by plotting the

element y axis.

a. Properties: Show

b. Select Bar Orientation

in the properties

window.

c. Select the

default_group.

d. Click Apply.

a

b

c

d



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Change the display of loads,

boundary conditions, and element

properties from geometry to finite

elements.

a. Display / Load/BC/Elem

Props...

b. Check the Show on FEM

only box.

c. Click Apply.

d. Click Cancel.

e. Repeat steps from previous

page to plot the element y

axis for the stiffeners.

b

c d

a

Step 5. Loads/BCs: Create / Displacement / Nodal


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Create the boundary condition for the

model.

a. Loads/BCs: Create /

Displacement / Nodal.

b. Enter Simple_Support as theNew Set Name.

c. Click on the Input Data

button.

d. Enter for the

Translations.

e. Click OK.

f. Click on Select Application

Region.

g. Select Geometry as the

geometry filter.

h. Set the picking filter to Curve

or Edge.

i. Select the left and right edges

of the plate.

j. Click Add.

k. Click OK.

l. Click Apply.

d

e

g

h

i

j

k

a

b

c

f

l

Step 5. Loads/BCs: Create / Displacement / Nodal


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Stiffened plate with two

edges constrained.

Step 5. Loads/BCs: Create / Pressure / Element Uniform


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Apply pressure to the model.

a. Loads/BCs: Create / Pressure

/ Element Uniform.

b. Enter pressure as the New

Set Name.

c. Select 2D as the Target

Element Type.

d. Click on the Input Data

button.

e. Enter 5 in the Top Surf

Pressure field.

f. Click OK.

g. Click on Select Application

Region button.

h. Select Geometry as the

Geometry Filter.

i. Set the picking filter to

Surface.

j. Select all the surfaces for the

Application Region.

k. Click Add, and OK.

l. Click Apply.

e

f

h

i

j

k

a

b

c

d

g

l

Step 5. Loads/BCs: Create / Pressure / Element Uniform


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Stiffened plate model with

applied pressure.

Step 6. Analysis: Analyze / Entire Model / Full Run


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Submit the model for analysis.

a. Analysis: Analyze / Entire

Model / Full Run.

b. Click on the Solution Type.

c. Select LINEAR STATIC as

the Solution Type.

d. Click OK.

e. Click Apply.

a

b

c

d

e

Step 7. Analysis: Attach XDB / Result Entities / Local


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After the job is completed, attach the

XDB result file.

a. Access Results / Attach XDB /

Result Entities.

b. Click on Select Result File.

c. Select the file called

stiffened_plate.xdb.

d. Click OK.

e. Click Apply.

a

c

d

e

b

Step 7. Results: Create / Quick Plot


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Plot plate stress and deformation

results.

a. Results: Create / Quick

Plot.

b. Select the Default result

case.

c. Select Stress Tensorfor

the Fringe Result.

d. Select Displacement,

Translational for the

Deformation Result.

e. Click Apply.

a

b

c

d

e

Step 7. Results: Create / Quick Plot


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Plot bar stress results.

a. Select Bar Stresses,

Maximum Combined

for the Fringe Result.

b. Click Apply.

c. Plot the remaining bar

stress components one

at at time.

a

b

c

Documents

15 Stiffened Plate PAT301