workshop 3 frame model creation using · pdf filetitle: nas120 training author: hanson chang...

WS3-1PAT301, Workshop 3, December 2005Copyright© 2005 MSC.Software Corporation

WORKSHOP 3FRAME MODEL CREATION USING

CURVES, AND ANALYSIS


Workshop ObjectivesModel a simple frame structure using geometric curves and 1D Bar elements. The frame model is to be constrained using pin restraints, and the loading is to be concentrated forces and inertial loading (load due to gravity). An analysis is to be done, and the results displayed.

Problem DescriptionDisplay structural model deformation and axial Bar stressFrame material: Aluminum with E = 10 x 106 psi, ν = 0.3, and density = 2.61 x 10-4 lbf*sec2/in4

Load on frameDead loads, operating static load, and gravity load

Software VersionMSC.Patran 2005r2MSC.Nastran 2005r2b


Key Concepts and Steps:Database: create a new database with Analysis Code = MSC.Nastran and Analysis Type = StructuralGeometry: create curves to represent the frame structureElements: mesh the curves with Bar2 elementsLoads/BCs: constrain the four corners of the frame, and apply the dead loads, operating static load, and gravity loadMaterials: specify an isotropic material for AluminumProperties: create a 1D Beam propertyAnalysis: Solution Type = Nastran Linear Static, Solution Sequence = 101, Method = Full RunAnalysis: access analysis results by attaching the XDB file to databaseResults: plot displaced structural shape and Bar Stress, Axial X-Component results


Step 1. Create a Database

Create a new database.a. File / New.b. Enter frame 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

e

f

d

c g


Step 2. Create Geometry of the Frame

a. Geometry: Create / Curve / XYZ.

b. Select on Vector Coordinates List and enter <24 0 0>.

c. Apply.

a

b

c


Step 2. Create Geometry of the Frame (Cont.)

a. Geometry: Transform / Curve / Translate.

b. Select on Translation Vectorand enter <24 0 0>.

c. Repeat Count: 4.d. Curve List: Select Curve 1.e. Click on Label Control and

select curve. You should see 5 curves as shown in the figure.

NOTE: We will leave on the Auto Execute. This allows the step to be executed automatically without hitting Apply.

a

b

c

d

e



a. Transform / Curve / Translate.

b. Select on Translation Vector List and enter <0 48 0>.

c. Repeat Count: 1.d. Curve List: Select all

Curves. (Curves 1:5)

a

b

c

d



a. Transform / Curve / Rotate.

b. Rotate Angle: 90.c. Repeat Count: 1.d. Curve List: select Curve

1 and 2.

a

b

c

d

Select curve 1 and 2.



a. Transform / Curve / Translate.

b. Translation Vector: <24 0 0>.

c. Repeat Count: 1.d. Curve List: select Curve 11

and 12.e. Change Translation Vector

to <96 0 0>.f. Apply.g. Change Translation Vector

to <120 0 0>.h. Apply.

a

b

c

d



a. Your model should look like the following figure. The model is made of congruent curves.

b. Change view to Iso 3 View.

a


Step 3. Meshing the Curves

a. Change view to Iso3viewb. Elements: Create / Mesh /

Curve.c. Unclick Automatic

Calculation.d. Enter 12 for Global Edge

Length.e. Select on Curve List and

include all curves. Click and drag as shown in the figure to select all curves.

f. Applyg. Turn off the curve labels

and show the node labels.

g

b

c d

e

f

e

a


Step 4. Equivalence “All” Nodes

a. Elements: Equivalence / All / Tolerance Cube.

b. Apply.

a

b Magenta colored circle indicates that a node was deleted.


Step 5. Create Dead Load from Engine

We will create the first of three sets of loads.

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

b. Select on New Set Nameand enter dead_load.

c. Input Data.d. Enter <0 0 -150> for Force

<F1 F2 F3 >.e. OK.f. Select Application Region.g. Geometry Filter: FEM.h. Select on Select Nodes.

a

b

c

d

f

g

h


Step 5. Create Dead Load from Engine (Cont.)

a. Select on the nodes as shown in the figure.

b. Add.c. OK.d. Apply.

a

b

c

a



a. Select on New Set Nameand enter dead_load_2.

b. Input Data.c. Enter <0 0 -960> for Force

<F1 F2 F3 >.d. OK.e. Select Application Region.f. Geometry Filter: FEM.g. Select on Select Nodes.

a

b

c

de

f

g



a. Select on following Nodes shown in the figure.

b. Add.c. OK.d. Apply. a

b

c

a


Step 6. Create Operating Engine Static Load

a. Select on New Set Nameand enter op_static_load.

b. Input Data.c. Enter <0 -100 -100> for

Force <F1 F2 F3 >.d. OK.e. Select Application Region.f. Geometry Filter: FEM.g. Select on Select Nodes.

a

b

c

d

e

f

g


Step 6. Create Operating Engine Static Load (Cont.)

a. Select on the nodes as shown in the figure.

b. Add.c. OK.d. Apply.

b

c

a

a


Step 7. Create Gravity Load on Frame

a. Loads / BCs: Create / Inertial Load / Element Uniform

b. Enter gravity for New Set Name.

c. Input Data.d. In Trans Accel <A1 A2 A3>

enter <0 0 –386.4>.e. OK.f. Apply.

a

b

c

d

e

The application region is not specified explicitly by the user. The application region is created by all elements for which density is specified.


Step 8. Create Constraints for the Frame Support

Constrain the corner of the frame, fixing three transitional degrees of freedom.

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

b. Select on New Set Name: and enter fix_base.

c. Select Input Data.d. Enter <0 0 0> for

Translations <T1 T2 T3 >and Rotations <R1 R2 R3>.

e. OK.f. Click on Select

Application Region.g. Select Geometry for

Geometry Filter.

a

b

c

d

ef

g


a. Pick the Point or Vertex icon.b. Select four points at the

corners of the frame support, as shown in the figure.

c. Add.d. OK.e. Apply.

Step 8. Create Constraints for the Frame Support (Cont.)

a

c


Step 8. Create Constraints for the Frame Support (Cont.)

a. Reset Graphics.

Although the force directions may appear vertical, they are in fact off angled. You can switch to different views to observe this, or display the components for each vector.

a


Step 9. Defining Material

We will set aluminum as the material of the frame.

a. Materials: Create / Isotropic / Manual Input.

b. Select on Material Nameand enter aluminum.

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

ef


Step 10. Defining Properties for Frame Structure

a. Properties: Create / 1D/ Beam.

b. Click on Property Set Name and enter al-plate.

c. Select Input Properties.d. Click on Mat Prop Name

icon and select aluminumfrom Select Material list.

a

b

c

d

d


Step 10. Defining Properties for Frame Structure (Cont.)

a. Bar Orientation: <0 0 1>.b. Area: 10.c. Inertia 1,1: 40.d. Inertia 2,2: 8.e. Torsional Constant: 80.f. OK.

a

bc

d

e


Step 10. Defining Properties for Frame Structure (Cont.)

a. Use Label Control to display curve labels, and remove node labels.

b. Click on Select Members.c. Select all curves. (Curves

1:18)d. Add.e. Apply.

a

bd

e

c


Step 11. Check Assignment of Loads and BC’s to Load Case

a. Load Cases: Modify.b. Select Default in Select Load

Cases to Modify.c. Check that all Loads and BC’s

are selected.d. Cancel.

a

b

c

d


Step 12. Analysis

Run the analysis of the entire model.

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

d


Step 13. Access Results Under Analysis

We will attach the .xdb file in order to access the results.

a. Analysis: Access Results / Attach XDB / Result Entities.

b. Click on Select Result File.c. Select and attach the file

frame.xdb.d. OK.e. Apply.

b

c

a

d

e


Step 14. Results

Create a Quick Plot .a. Hide all labelsb. Results: Create / Quick Plot.c. Select A1:Static Subcase

under Select Result Cases.d. Select Displacements,

Translational under Select Deformation Result.

e. Select Deform Attributes.f. Click on Model Scale and

set the scale to 0.01.g. Apply.

b

c

d

e

f

g

a


Step 14. Results (Cont.)

Display shows the deformed shape of the structure.


Step 14. Results (Cont.)

a. Click Select Results icon.b. Select Bar Stresses, Axial

under Select Fringe Result.c. Quantity: X Component.d. Apply.

This ends this exercise.

e. File / Close.

b

c

a

workshop 3 frame model creation using · pdf filetitle: nas120 training author: hanson chang...

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