workshop 17 using lists and groups - fsb online · pdf fileauthor: bermudez created date:...

WS11-1PAT301, Workshop 11, December 2005Copyright© 2005 MSC.Software Corporation

WORKSHOP 11USING LISTS AND GROUPS


Workshop ObjectivesBecome familiar the tool that is used to create and manipulate lists of entities, i.e. node, element. The criteria that is used to define a list is material property, element thickness, and applied temperature. The operation that is used to manipulate the lists is intersection.

Problem DescriptionCreate a model of a portion of a fairing. Curves and surfaces will be 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 the structure. Assign properties to the elements.Determine those elements of a certain material, thickness > 0.98, and temperature > 230.0 using Tools: List/Boolean (intersection)

Software VersionMSC.Patran 2005r2


Key Concepts and Steps:Database: create a new database with Analysis Code = MSC.Nastran and Analysis Type = StructuralGeometry: create fairing geometry model using curves and surfacesElements: mesh the geometry with 1D or 2D elementsLoads/BCs: assign a varying temperature field to the elementsMaterials: create two material propertiesProperties: create two 2D element properties with varying thicknessTools: List/Create: create lists that depend on material property, element thickness, and applied temperatureTools: List/Boolean: intersect the lists to determine the list of elements that have all the properties listed above


Step 1. Create New Database

Create a new database and set the model preferences.

a. File : New.b. Enter fairing 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


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] under Points Coordinates

List and click Apply.d. Geometry : Create / Curve / XYZ.e. Turn Auto Execute off and enter

<0 120 0> and [50 40 0] under Vector Coordinates List and Origin Coordinates 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 under Starting Point

List and click on Point 2 for Ending Point List.

l. Click Apply.

a d

c e

f

i

k

l

g h

bj


Step 2. Create Model Geometry (Cont.)

Illustrated here are curves that represent the basic geometry for the fairing. These curves will be revolved 360º to get the final model.



Create the fairing by revolving curves 1 and 2 about the fairing’s vertical center line.

a. Geometry : Create /Surface/ Revolve.b. Enter Coord 0.2 for Axisc. Enter 360 for the Total Angle.d. Turn Auto Execute off.e. Shift-select curves 1 and 2.f. Click Apply.g. Viewing : Angles…h. Enter 30 0 0 under Angles.i. Click Apply.

a

b

c

ef

g

h

i

d



Change the display preferences in order to get a clearer visual of the model.

a. Display : Geometry…b. Enter 3 for Number ofDisplay Linesc. Click Apply, then Cancel.

a

b

c


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 / MeshSeed / Uniform.

b. Select Number of Elements and enter 36 for the Number.

c. Select the top circumferential edge of the fairing(Surface 1.3)and click Apply.

a

b

c


Step 3. Create Mesh Seeds (Cont.)

In the vertical direction(y-direction), define asmoothly transitioning mesh Density. Theelements 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 enter 7 and 10 for L1 and L2, respectively.

c. Turn Auto Execute off.d. Under Curve List, Select Curve 1 and

click Apply.e. Elements : Create / Mesh Seed /One

Way Bias.f. Select L1 and L2 and enter 4 and

7 for L1 and L2, respectively.g. Under Curve List, Select Curve 2

and click Apply.

a

d

b

e

f

g

c


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 byclicking the Hide labelsicon.

f. Decrease the point-sizeclicking on the Point Size icon.

a

b

c

e df


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 Bar2e. Shift select the 3 surface

edges (as indicated).f. Click Apply. b

c

d

e

f

a

e


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 underDisplay Type.

c. Click Apply.d. Elements : Equivalence /

All / Tolerance Cube.e. Click Apply.f. Repeat steps a through c.

a

b

c

d

eThe middle yellow line does not indicate Quad 4’s with free edges, but the presence of Bar2 elements.


Step 6. Create a Group

Replot the FEM and create a group called FEM containing only the finite elemental model. Post only thisnew group to the viewport.

a. Click on the Plot/Erase icon.b. Under FEM, click Plot.c. Click OK.d. Group : Create…e. Enter FEM 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

gh


Step 7. Create Material Properties

Create the first material for the model. Material alum_1 will beapplied to the top(cylindrical) portion of the fairing.

a. Materials : Create / Isotropic / Manual Input.

b. Enter alum_1 for the Material Name.

c. Click on Input Properties…d. Select Linear Elastic and

enter 1.05E7, 0.33, and 2.6E-4, for Elastic Modulus,Poisson Ratio, and Density, respectively.

e. Click OK.f. Click Apply.

a

b

c

d

ef


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. Enter alum_2 for the MaterialName.

c. Click on InputProperties…

d. Select Linear Elastic and enter 1.18E7, 0.33, and 2.4E-4, for Elastic Modulus, Poisson Ratio, and Density,respectively.

e. Click OK.f. Click Apply.

a

b

c

d

ef


Step 8. Create a Field

Define fields that represent the varying thickness and temperature distribution.

a. Fields : Create / Spatial / PCL Function.

b. Enter thickness for the Field Name.

c. Enter 1.5-’Y/160 for theScalar Function and click Apply.

d. Fields : Create / Spatial / PCL Function.

e. Enter temperature for the Field Name.

f. Enter 200.0 (150.0/160.0)*’Xfor the Scalar Function and click Apply.

a

b

c

d

e

f


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. Enter prop_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.)

Finish creating the first property set.a. Click on Thickness icon and

select thickness under SelectExisting Field.

b. Click OK.c. Preferences : Picking, and set

Rectangle/Polygon Pickingto 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 bydragging a box around thedesired section (as indicatedon next page).

f. Click Add, then Apply.

a

b

e

f

c

e



Illustrated here is the desired application region for the first property set.

e



Create the second property set.a. Properties : Create / 2D /

Shell.b. Enter prop_2 for the Property

Set Name.c. Click on Input Properties…d. Click on Material Property

Name icon and select alum_2 from Select Existing Material.

e. Click on Thickness icon andselect 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



Shown here are the elements for the desired application region of the second property set.


Step 10. Create Temperature Boundary Conditions

Define the model’s varying temperature distribution.

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

b. Enter temp 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. Under Geometry Filter, select FEM.h. Click on Application Region and

select the entire model(All nodes).i. Click Add, then, OKj. Click Apply.

a

b

c

d

ef

g

h

i

j


Step 10. Create Temperature Boundary Conditions (Cont.)

Turn off the temperature labels in order to get a better visualization of the model.

a. Display : Load/BC/Elem. Props…

b. Under Loads/BC’s remove check for Temperature.

c. Click Apply, then Cancel.

a

b

c


Step 11. Create Lists

Use Lists and groups to filter, then group the quad elements that have the following attributes:Material : alum_1Thickness : > 0.98 Temperature : > 230.0

a. Tools : List / Create…b. FEM / Element / Attributec. Under Attribute select Material.d. Under Existing Materials select

alum_1. e. Set the Target List to “A” and clickf. Apply.

a

b

c

d

e

List A consists of those elements whose properties are specified by alum_1.


Step 11. Create Lists (Cont.)

Define List B to include only the Quad elements that have a thickness greater than 0.98.

a. Properties : Show.b. Under Existing

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.)

After defining the list parameters, add the elements with thicknessgreater than 0.98, to list B.

a. Tools : List / Create…b. FEM / Element / Attribute.c. Under Attribute select Fringe

Value.d. Under Fringe Tools select

default_Fringe.e. Change F to > and enter 0.98.f. Select “B” for the Target

List.g. Click on Apply.

a

b

c

d

e

fg

The contents of List B include all elements thicker than 0.98.


Step 12. Intersect Lists

Intersect Lists A and B and replace 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 is composed of elements that satisfy both requirements: they are in set alum_1 and thicker than 0.98.

a

b

c

d


Step 13. Create More Lists

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 underSelect Data Variable.

d. Select the FEM group ande. click Apply.

Illustrated here is the temperature fringe plot for the model.

a

b

c

d


Step 13. Create More Lists (Cont.)

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 for Attribute and Fringe Tools, respectively.

d. Change F to > and enter 230.0.e. Select “B” for the Target List.f. Click on Clear on the List B formg. Click Apply on the List Create

form.

a

b

c

d

e

f

g


Step 14. Intersect Lists Again

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. Enter common_quads for the

Group Name.f. Click Apply, then Cancel.

a

b

c

d e

f


Step 15. Post Group

Post the common_quadgroup. This is the group ofElements that satisfy all threeof the conditions definedearlier.

a. Group : Post…b. Select the

common_quads group under Select Groups to Post.

c. Click Apply, thenCancel.

d. Click on the Iso 1 viewicon.

a

b

c

d


Step 15. Post Group (Cont.)

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

Create two new groups, prop1_group and prop2_group. Then, change the display attributes for each group.

a. Click on the Reset Graphics icon.

b. Group : Create…c. Create / Property Set.d. Enter prop1_group for the

Group Name.e. Select prop_1 under Property Sets

and click Apply.f. Repeat steps b through e

entering prop2_group for the Group Name and selecting prop_2 under Property Sets.

a

b

c

d

e

f


Step 17. Change the Display Attributes

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 under Entity 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

Change views and post the prop1_group.

a. Click on the Iso 3 view icon.

b. Group : Post…c. Under Select Groups

to Post, select prop1_group.

d. Click Apply.

a

b

c

d


Step 18. Post Groups (Cont.)

Post only the prop2_group.a. Group : Post…b. Under Select Groups to

Post, select prop2_group.

c. Click Apply.

a

b

c


Step 18. Post Groups (Cont.)

Post both the prop1_group and the prop2_group.

a. Group : Post…b. Under Select

Groups to Post, select both prop1_group andprop2_group.

a. Click Apply.

a

b

c

workshop 17 using lists and groups - fsb online · pdf fileauthor: bermudez created date:...

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