exercise 03: analyzing beam model overview truss …kmpkm.zut.edu.pl/pub/mes/nastran fx/tutorials...

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Exercise 03: Analyzing Beam Model

Overview Truss Model

In this example rod and beam elements are used for modeling of a truss structure.

NFX analysis process includes:

- opening file with the geometry of

the truss

- material and property definitions

- meshing using beams and rods

- constraints and load applications

- NEi Nastran analysis of the model

- post-processing of the results

http://www.femdesign.pl A Member of FEMComp Engineering Group Analyzing Beam Model 01-19

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Procedure

1. File, Open… Truss.fnb for

model geometry

2.Click Right Mouse button in

Work Window and select [Hide

Datum & Grid].

3.Click [Isometric 2] button on

View toolbar.

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02-19http://www.femdesign.pl A Member of FEMComp Engineering Group Analyzing Beam Model


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Add Material to Model

1. In Model –Works Tree window

right click on Material and select

Add, Isotropic… command.

2. Go to material data base clicking

on [DB <] and select Alloy Steel.

3. Press [Close] button.

4. Click [OK] button to set the

material parameters.

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http://www.femdesign.pl A Member of FEMComp Engineering Group Analyzing Beam Model


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Beam Properties

1. In the Model –Works Tree

window right click on Property and

select Add, 1D… command.

2. Press Beam tab.

3. Activate and press Section

(PBEAML) button.

4. Choose L from section list and

enter the following section

parameters: DIM1 = DIM2 = 4

DIM3 = DIM4 = 1

Press [OK] button to close Section

Template window.

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1. In the Create/Modify 1D Property

set the Name to L Angle Property,

and review calculated values.

2. Press [OK] to create beam

property.

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Beam Properties


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Create Beam Mesh

1. From Menu Bar select Mesh, 1D,

Auto Mesh Edge…

2. Select 16 Edges. (see figure)

3. Set Number of Divisions to 1.

4. Click [Orientation] button. Set

the Reference Vector (Element Y-

Axis) to: 0, 1, 0 .

5. Set the Name to: Beam Mesh.

6. Press [OK] button.

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Display Cross Section

1. In the Model –Works Tree

window expand Property.

2. Right click on L Angle Property

and select Show Section…

As you see, some of the beam are

oriented differently. The next few

steps show you how to reverse the

normals when they are facing in the

wrong direction.

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Reverse Normals

1. From Menu Bar select Mesh,

Element, General Parameters…

2. Select Reverse Normal

option.

3. Set the Selection Filter to 1D

Element (O).

4. Pick 2 wrong oriented

elements.



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Create Rod Mesh

1. From Menu Bar select Mesh, 1D,

Auto Mesh Edge…

2. Select 28 highlighted Edges. (see

figure)

3. Set Number of Divisions to 1.

4. Click [Orientation] button. Set

the Reference Vector (Element Y-

Axis) to: 1, 0, 0 .

5. Click [Property] button to create

Rod Property.


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1. Type Rod Property as the Name.

2. Press [Section (Value)] button.

3. Enter 1 as DIM1.

4. Press [OK] button to close

Section Template window.

5. Type Rod Mesh as the Name of

the Mesh Set.


Display/Hide Truss Cross Sections.

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Create Rod Mesh


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Constraints Application

1. From Menu Bar select Analysis,

Boundary Condition, Constraint…

2. Enter Nodal Constraints as the

Name of BC Set.

3. Pick Nodes A, B, C, D. (see figure)

4. Click [Plane 23] button.

(Symmetry Plane - YZ)

Notice: The T1, R2 and R3 DOF are

selected.

5. Press [Apply] button.

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B

C

D

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1. Pick Nodes E, F. (see figure)

2. Click [Fixed] button. Notice: ALL

DOF are selected.

3. Press [Apply] button.

Finally you will restrain for all nodes

in the Z translation and all rotations.

5. Press [Displayed] button.

6. Check on T3, R1, R2, R3 DOF.



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Notice: All Constraints are combined by default.

Constraints Application


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Apply the Load


Static Load, Force…

2. Enter Nodal Force as the Name

of Load Set.

3. Pick nodes A, B. (see figure)

4. Enter -200 under F2 force

component.



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Notice: All Loads are combined by default.

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Analysis Setup


Analysis Case… command.

2. Click [Add] button.

3. Set Solution Type to

Linear Static (101).

4. Enter Title as Static Beam Model.

5.Press [OK].

6.Press [Close] in the Analysis Case

Manager window.

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1.From Menu Bar select Analysis,

Solve… command.

2. Solver Manager dialog box

appears.

3. Press [OK] to run the analysis.

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Analysis Setup


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Results Post-Processing

Beam Diagrams

1. Select Post Data toolbar.

2. Expand Data Filter and select

1D Element Stresses.

3. Set the Result Data Type to

BEAM S END A POINT C

4. Expand Mesh Shape and select

Undeformed option.

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The next few steps show you how to customize

displaying of the Beam Diagrams.

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1. Under Properties left panel

choose Diagram.

2. Set the Scale Factor to 5.

3. Change Line fill to Solid Fill (or

Solid Fill to Line Fill).

4. Reverse displaying of the

diagram. Select True.

5. Click [Apply] button.

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Your model should look very similar.


Beam Diagrams

Customization


1. Under Diagram change Result

Direction to Local Z.


3. In Properties choose Values.

4. Set the Value Type to ALL.


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Beam Diagrams

Customization


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Criteria Diagrams Display

1. From Data Filter select 1D

Element Forces/Moments.

2. Set the Result Data Type to

BEAM S FORCE END A-X

3. Under Properties left panel

choose once again Diagram.

4. Set the Scale Factor to 0.

5. Set the Fill Type to Line Fill.


7. Save your model.

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exercise 03: analyzing beam model overview truss …kmpkm.zut.edu.pl/pub/mes/nastran fx/tutorials...

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