10 list group pat301

7/29/2019 10 List Group PAT301

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PAT301, Workshop 11, December 2005

Copyright 2005 MSC.Software Corporation

WORKSHOP 11

USING LISTS AND GROUPS


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z Workshop Objectives

z Become familiar the tool that is used to create and manipulate listsof entities, i.e. node, element. The criteria that is used to define alist is material property, element thickness, and appliedtemperature. The operation that is used to manipulate the lists isintersection.

z Problem Description

z Create a model of a portion of a fairing. Curves and surfaces willbe used to define the fairing geometry. The finite element modelwill consist of 2D elements with 1D elements at various edges ofthe geometry. The 1D elements will represent stiffeners for thestructure. Assign properties to the elements.

z Determine those elements of a certain material, thickness > 0.98,and temperature > 230.0 using Tools: List/Boolean (intersection)

z Software Version

z MSC.Patran 2005r2


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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: create fairing geometry model using curves and surfaces

z Elements: mesh the geometry with 1D or 2D elements

z Loads/BCs: assign a varying temperature field to the elements

z Materials: create two material properties

z Properties: create two 2D element properties with varying thickness

z Tools: List/Create: create lists that depend on material property,

element thickness, and applied temperature

z Tools: List/Boolean: intersect the lists to determine the list of elements

that have all the properties listed above


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Step 1. Create New Database

Create a new database and set the

model preferences.

a. File : New.

b. Enterfairing for the File Name.

c. Click OK.

d. Set the Tolerance to Default.

e. Make sure that the Analysis

Code and Analysis Type are set

to MSC.Nastran and Structural,respectively.

f. Click OK.

a

b c

d

e

f


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Step 2. Create Model Geometry

Create the points and curves that

represent the outline of the fairing.

a. Geometry : Create / Point / XYZ.

b. Turn Auto Execute off.c. Enter[30 0 0] underPoints Coordinates

List and click Apply.

d. Geometry : Create / Curve / XYZ.

e. Turn Auto Execute off and enter

and [50 40 0] underVector

Coordinates List and OriginCoordinates List, respectively.

f. Click Apply.

g. Click on Show Labels icon.

h. Click on Point Size icon to increase the

point size.

i. Geometry : Create / Curve / Point.

j. Turn Auto Execute off.

k. Click on Point 1 underStarting Point

List and click on Point 2 forEnding

Point List.

l. Click Apply.

a d

c e

f

i

k

l

g h

bj


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Step 2. Create Model Geometry (Cont.)

Illustrated here are curves that

represent the basic geometry for thefairing. These curves will be revolved

360 to get the final model.


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Create the fairing by revolving

curves 1 and 2 about the fairings

vertical center line.

a. Geometry : Create /Surface/ Revolve.b. EnterCoord 0.2 forAxis

c. Enter360 for the Total Angle.

d. Turn Auto Execute off.

e. Shift-select curves 1 and 2.

f. Click Apply.

g. Viewing : Angles

h. Enter30 0 0 underAngles.

i. Click Apply.

a

b

c

e

f

g

h

i

d

S 2 C M d l G (C )


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Change the display preferences

in order to get a clearer visual of

the model.a. Display : Geometry

b. Enter3 forNumber of

Display Lines

c. Click Apply, then Cancel.

a

b

c

St 3 C t M h S d


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Step 3. Create Mesh Seeds

Create a finite elemental mesh

so that 4 node Quad elements

are created every 10 along the

circumferential edges.

a. Elements : Create / Mesh

Seed / Uniform.

b. Select Number of

Elements and enter36for the Number.

c. Select the top

circumferential edge of

the fairing(Surface 1.3)

and click Apply.

a

b

c

St 3 C t M h S d (C t )


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Step 3. Create Mesh Seeds (Cont.)

In the vertical direction(y-direction), define a

smoothly transitioning mesh Density. The

elements along the top of the cylinder are 2.5times as large as those along the bottom edge

(tapered end) of the fairing.

a. Elements : Create / Mesh Seed /One

Way Bias.

b. Select L1 and L2 and enter7 and 10

forL1 and L2, respectively.

c. Turn Auto Execute off.

d. UnderCurve List, Select Curve 1 and

click Apply.

e. Elements : Create / Mesh Seed /One

Way Bias.

f. Select L1 and L2 and enter4 and

7 forL1 and L2, respectively.

g. UnderCurve List, Select Curve 2

and click Apply.

a

d

b

e

f

g

c

Step 4 Create Model Meshes


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Step 4. Create Model Meshes

Now that the mesh seeds have

been created, mesh the model

using Quad4 topology.a. Elements : Create / Mesh/

Surface.

b. Select Quad, IsoMesh,

and Quad4.

c. Select the entire model

by dragging a box aroundit. And click Apply.

d. Remove the display lines

by clicking the on the

Display lines icon.

e. Remove the labels by

clicking the Hide labels

icon.

f. Decrease the point-size

clicking on the Point Size

icon.

a

b

c

e df

Step 4 Create Model Meshes(Cont )


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Step 4. Create Model Meshes(Cont.)

Mesh the horizontal

(circumferential)

edges of each surface with two-noded bar elements.

a. Click on Plot/Erase icon

and click on Erase under

FEM.

b. Click OK.

c. Elements : Create / Mesh

/ Curve.

d. Set Topology to Bar2

e. Shift select the 3 surface

edges (as indicated).

f. Click Apply. b

c

d

e

f

a

e

Step 5 Observe the Free Edges


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Step 5. Observe the Free Edges

Check the free edges of the

model, equivalence, and then

check the free edges again.a. Elements : Verify /

Element / Boundaries.

b. Select Free Edges under

Display Type.

c. Click Apply.

d. Elements : Equivalence /

All / Tolerance Cube.

e. Click Apply.

f. Repeat steps a through c.

a

b

c

d

e

The middle yellow line does

not indicate Quad 4s with

free edges, but the

presence of Bar2 elements.

Step 6 Create a Group


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Step 6. Create a Group

Replot the FEM and create a group

called FEM containing only the finite

elemental model. Post only this

new group to the viewport.

a. Click on the Plot/Erase icon.

b. UnderFEM, click Plot.

c. Click OK.

d. Group : Create

e. EnterFEM for the New

Group Name.

f. Select Unpost All Other

Groups.

g. Change Grou

Contents to Add All FEM.

h. Click Apply.

a

b

c

d

e

f

g

h

Step 7 Create Material Properties


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Step 7. Create Material Properties

Create the first material for the

model. Material alum_1 will be

applied to the top(cylindrical) portion

of the fairing.

a. Materials : Create / Isotropic /

Manual Input.

b. Enteralum_1 for the Material

Name.

c. Click on Input Properties

d. Select Linear Elastic and

enter1.05E7, 0.33, and 2.6E-4,

forElastic Modulus,Poisson

Ratio, and Density,

respectively.

e. Click OK.

f. Click Apply.

a

b

c

d

ef

Step 7 Create Material Properties (Cont )


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Step 7. Create Material Properties (Cont.)

Create the second material for

the model. Material alum_2 will

be applied to the bottom(tapered) portion of the fairing.

a. Materials : Create /

Isotropic / Manual Input.

b. Enteralum_2 for the

MaterialName.

c. Click onInputProperties

d. Select Linear Elastic and

enter1.18E7, 0.33, and

2.4E-4, forElastic

Modulus, Poisson

Ratio, and Density,

respectively.

e. Click OK.

f. Click Apply.

a

b

c

d

e

f

Step 8. Create a Field


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Step 8. Create a Field

Define fields that represent the

varying thickness and temperature

distribution.

a. Fields : Create / Spatial / PCL

Function.

b. Enterthickness for the Field

Name.

c. Enter1.5-Y/160 for the

Scalar Function and click Apply.

d. Fields : Create / Spatial / PCL

Function.

e. Entertemperature for the

Field Name.

f. Enter200.0 (150.0/160.0)*Xfor the Scalar Function and click

Apply.

a

b

c

d

e

f

Step 9. Create Element Properties


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Step 9. Create Element Properties

Create two element properties

which include the material

definitions and varying thickness.

a. Click on the Front view icon.

b. Properties : Create / 2D /Shell.

c. Enterprop_1 for the

Property Set Name.

d. Click on Input Properties.e. Click on Material Property

Name icon and select alum_1

from Select Existing Material.

a

b

c

d

e

Step 9. Create Element Properties (Cont.)


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p p ( )

Finish creating the first property set.

a. Click on Thickness icon and

select thickness underSelectExisting Field.

b. Click OK.

c. Preferences : Picking, and set

Rectangle/Polygon Picking

to Enclose entire entity.

d. Click Close.

e. Click on Select Members and

click on the Shell element

icon. Select the top (cylindrical)

portion of the fairing by

dragging a box around thedesired section (as indicated

on next page).

f. Click Add, then Apply.

a

b

e

f

c

e



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p p ( )

Illustrated here is the desired

application region for the first

property set.

e



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p p ( )

Create the second property set.

a. Properties : Create / 2D /

Shell.

b. Enterprop_2 for the Property

Set Name.

c. Click on Input Properties

d. Click on Material PropertyName icon and select alum_2

from Select Existing Material.

e. Click on Thickness icon and

select thickness from Select

Scalar Spatial Field.

f. Click OK.

g. Click on Select Members and

select the bottom(tapered)

portion of the fairing by

dragging a box around it(as

indicated on next page).

h. Click Add, then Apply.

a

b

c

d

e

f

g

h



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Shown here are the

elements for the

desired application

region of the second

property set.

Step 10. Create Temperature Boundary Conditions


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Define the models varying temperature

distribution.

a. Loads/BCs : Create / Temperature

/ Nodal.

b. Entertemp for the New Set Name.

c. Click on Input Data

d. Click on Temperature and select

temperature from the Spatial

Fields.e. Click OK.

f. Click on Select Application

Region.

g. UnderGeometry Filter, select FEM.

h. Click on Application Region and

select the entire model(All nodes).

i. Click Add, then, OK

j. Click Apply.

a

b

c

d

e

f

g

h

i

j

Step 10. Create Temperature Boundary Conditions (Cont.)


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Turn off the temperature labels in

order to get a better visualization of

the model.

a. Display : Load/BC/Elem.Props

b. Under Loads/BCs remove

check forTemperature.

c. Click Apply, then Cancel.

a

b

c

Step 11. Create Lists


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Use Lists and groups to filter, then group

the quad elements that have the following

attributes:

Material : alum_1

Thickness : > 0.98

Temperature : > 230.0

a. Tools : List / Create

b. FEM / Element / Attribute

c. UnderAttribute select Material.

d. UnderExisting Materials select

alum_1.e. Set the Target List to A and click

f. Apply.

a

b

c

d

e

List A consists of those

elements whose propertiesare specified by alum_1.

Step 11. Create Lists (Cont.)


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Define List B to include only the

Quad elements that have a

thickness greater than 0.98.

a. Properties : Show.

b. UnderExisting

Properties, select

Thickness.

c. Set Display Method to

Scalar Plot.

d. Select Current Viewport,

select FEM and click

Apply.

a

b

c

d

Shown above is a fringe plot corresponding to the model

thickness. The elements that are thicker than 0.98 will be

included in the next list.

Step 11. Create Lists (Cont.)


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After defining the list parameters,

add the elements with thickness

greater than 0.98, to list B.

a. Tools : List / Create

b. FEM / Element / Attribute.

c. UnderAttribute select FringeValue.

d. UnderFringe Tools select

default_Fringe.

e. Change F to > and enter0.98.

f. Select B for the Target

List.g. Click on Apply.

a

b

c

d

e

f

g

The contents ofList B

include all elementsthicker than 0.98.

Step 12. Intersect Lists


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Intersect Lists A and B andreplace the contents of List A

with the elements found in the

intersection.

a. Tools : List / Boolean

b. Click on the Intersect

icon.c. Click on Replace A.

d. Click Cancel.

The new List A iscomposed of elements

that satisfy both

requirements: they are

in set alum_1 and

thicker than 0.98.

a

b

cd

Step 13. Create More Lists


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Perform a final classification of the

elements. Isolate those elements

that satisfy the third condition of the

applied temperature load > 230.0.

a. Loads/BCs : Plot Contours /

Temperature.

b. Select temp from the Existing

Sets.

c. Select Temperature under

Select Data Variable.

d. Select the FEM group and

e. click Apply.

Illustrated here is the temperature fringe plot for the model.

a

b

c

d

Step 13. Create More Lists (Cont.)


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Clear the contents of List B and add the

values obtained from the final classification.

a. Tools : List / Create.

b. FEM / Element / Attribute.

c. Select Fringe Value and

default_Fringe forAttribute and

Fringe Tools, respectively.

d. Change F to > and enter230.0.

e. Select B for the Target List.

f. Click on Clearon the List B form

g. Click Apply on the List Createform.

a

b

c

d

e

f

g

Step 14. Intersect Lists Again


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Lists A and B will be intersected

again to create a List C. This list will

contain the elements that satisfy all

three conditions. The contents of

List C will then be placed into a new

group called common_quads.

a. Tools : List / Boolean

b. Click Clear.

c. Click on the Intersect icon.

d. Click on Add To Group

e. Entercommon_quads for theGroup Name.

f. Click Apply, then Cancel.

a

b

c

d e

f

Step 15. Post Group


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Post the common_quad

group. This is the group ofElements that satisfy all three

of the conditions defined

earlier.

a. Group : Post

b. Select the

common_quads group

underSelect Groups

to Post.

c. Click Apply, then

Cancel.

d. Click on the Iso 1 viewicon.

a

b

c

d

Step 15. Post Group (Cont.)


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This is the Iso 1 view of the elements

in the common_quads group. These

are all the elements that satisfied all

three conditions.

Step 16. Create Two New Groups


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Create two new groups, prop1_group

and prop2_group. Then, change thedisplay attributes for each group.

a. Click on the Reset Graphics

icon.

b. Group : Create

c. Create / Property Set.

d. Enterprop1_group for the

Group Name.

e. Select prop_1 underProperty Sets

and click Apply.

f. Repeat steps b through e

entering prop2_group for theGroup Name and selecting

prop_2 underProperty Sets.

a

b

c

d

e

f

Step 17. Change the Display Attributes


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Set the entity coloring and labeling to Group mode

and then change the display attributes for each of

the two new groups.a. Display : Entity Color / Label / Render

b. Select Group underEntity Coloring and Labeling.

c. Select the prop1_group under the Target Group(s).

d. Select Wireframe for the Render Style and select

yellow for the Shade Color.

e. Click Apply.

f. Select the prop2_group for the Target Group(s).

g. Select Hidden Line for the Render Style and select

dark blue for the Shade Color.

h. Click Apply, then, Cancel.

a

b

c

d

e

f

g

h

Step 18. Post Groups


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Change views and post the

prop1_group.

a. Click on the Iso 3 view

icon.

b. Group : Post

c. UnderSelect Groups

to Post, select

prop1_group.

d. Click Apply.

a

b

c

d

Step 18. Post Groups (Cont.)


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Post only the prop2_group.

a. Group : Postb. UnderSelect Groups to

Post, select

prop2_group.

c. Click Apply.

a

b

c

Step 18. Post Groups (Cont.)


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Post both the prop1_group

and the prop2_group.

a. Group : Post

b. UnderSelect

Groups to Post, select

both prop1_group and

prop2_group.a. Click Apply.

a

b

c


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