day2 cant beam 2d

7/31/2019 Day2 Cant Beam 2D

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CANTILEVERED BEAM USING 2DELEMENTS AND ANALYSIS


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Suggested Exercise Steps1. Start MSC.Patran and create a new database cant_beam_2D.db.

2. Create 5x1x1.5 parametric solid.

3. Create 2D Quad4 mesh on the four long sided faces of the solid.

4. Display element free edges.

5. Connect Quad4 elements together using equivalence.6. Display element free edges (after equivalencing).

7. Apply concentrated force at free end of cantilevered beam and offset frombeam centerline.

8. Constrain (fix) cantilevered end of beam.

9. Create material properties for beam; use aluminum properties.

10. Create properties for Quad4 elements. They include both bending andmembrane properties.

11. Check load case.

12. Perform linear static analysis for 2D model.13. Read results by attaching the MSC.Nastran xdb results file.

14. View the deformation results.

15. View both the deformation and stress results; save a copy of the databaseto be used later for a transient analysis of the beam.


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Step 1. Create a Database for 2D Element Model

Create a new database for2D element model.

a. File / New.b. Enter

cant_beam_2D asthe file name.

c. Click OK.d. Choose Default

Tolerance.

e. Select MSC.Nastranas the AnalysisCode.

f. Select Structural asthe Analysis Type.

g. Click OK.

a

b

e

f

d

c g


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Step 2. Create Solid Geometry

a. Geometry: Create /Solid / XYZ.

b. Select on VectorCoordinates Listand enter < 5 1 1.5 >.

c. Apply.

d. Change view to Iso 1View.

a

b

c

d


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Step 3. Create 2D Element Mesh

a. Elements: Create /Mesh / Surface.

b. Element Shape:Quad.

c. Mesher: IsoMesh.d. Topology: Quad4.

e. Click on Surface Listand select the fourlong faces of the

solid, not includingthe end faces .

f. Enter 0.5 for GlobalEdge Length.

g. Apply.

a

bc

d

e

f

g


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Step 4. Display Free Edges

a. Elements: Verify /Element /Boundaries.

b. Display Type: FreeEdges.

c. Apply.

d. As shown in thefigure, yellow linesalong the solid edges

should appear

a

b

c


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Step 5. Connect the Elements Together

a. Elements:Equivalence / All /Tolerance Cube.

b. Apply.

Notice that magenta

colored circles are drawnwhere nodes areequivalenced.

a

b


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Step 6. Display Free Edges Again

a. Elements: Verify /Element /Boundaries.

b. Display Type: FreeEdges.

c. Apply.

No longer do the yellow lines in thelong direction appear. This means

that the adjacent 2D quad elementsare connected.

a

b

c


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Step 7. Apply a Force at One End

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

b. Select on New SetNameand enter force.

c. Input Data.

d. Enter forForce .

e. OK.

f. Select ApplicationRegion.

g. Geometry Filter:Geometry.

h. Click on SelectGeometry Entities.

i. Select Point or Vertexicon from the Pick

Menu.

a

b

c

d

e

f

g

h

i

S 7 A l F O E d ( )


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Step 7. Apply a Force at One End (cont.)

a. Turn on the Pointlabels.

b. Select on thepoint(Point 7) as

shown in the figure.c. Add.

d. OK.

e. Apply.

Close-Up

b

c

d

a

Note that selecting Point 7 and

Vertex Solid 1.2.2.2 isequivalent.

St 8 C t C t i t


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Step 8. Create Constraints

Constrain beam at other end,fixing all six degrees of

freedom at all nodes.a. Loads / BCs: Create /

Displacements / Nodal.

b. Select on New SetName: and enterfix_end.

c. Select Input Data.

d. Enter forTranslations and Rotations .

e. OK.

f. Click on SelectApplication Region.

g. Select Geometry forGeometry Filter.

h. Click on SelectGeometry Entities.

i. Select Curve or Edge

a

b

c

d

ef

g

h

i

St 8 C t C t i t (C t )


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a. Select the four solidedges as shown inthe figure.

b. Add.

c. OK.d. Apply.

Step 8. Create Constraints (Cont.)

Select these edges a

b

c

Step 9 Create Material Properties


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Step 9. Create Material Properties

a. Materials: Create /Isotropic / ManualInput.

b. Select on MaterialNameand enteraluminum.

c. Select InputProperties.

d. Enter:Elastic Modulus:10e6.

Poisson Ration: 0.3.

e. OK.

f. Apply.

a

b

c

d

e

Step 10 Create Element Properties for the 2D Quad Topology


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Step 10. Create Element Properties for the 2D Quad Topology

a. Properties: Create /2D / Shell.

b. Option(s):Homogeneous /Standard Formulation.

c. Select Property SetNameand enteralum_2D.

d. Select Input

Properties.e. From the Material

Property Sets, selectaluminum for MaterialName.

f. Thickness: 0.1.

g. OK.

a

b

c

d

e

f

g

Step 10 Create Element Properties for the 2D Quad Topology (Cont )


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Step 10. Create Element Properties for the 2D Quad Topology (Cont.)

a. Click on SelectMembers.

b. Select the four longsolid faces.

c. Add.d. Apply.

e. Turn off the Pointlabels.

a

b

c

d

Step 11 Check Assignment of Loads and BCs to Load Case


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

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

Load Case to Modify.

c. Check that all Loadsand BCs are selected.

d. Cancel..

a

b

c

d

Step 12 Run the Analysis


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Step 12. Run the Analysis

Run the analysis of themodel.

a. Analysis: Analyze /Entire Model / FullRun.

b. Select SolutionType.

c. Choose LINEARSTATIC for Solution

Type.d. OK.

e. Apply.

b

c

d

a

Step 13 Read Results Under Analysis


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Step 13. Read Results Under Analysis

Attach the .xdb file to readthe results.

a. Analysis: Attach XDB/ Result Entities /Local.

b. Click on SelectResults File.

c. Select and attachcant_beam_2D.xdb.

d. OK.e. Apply.

c

d

a

b

Step 14. View Results


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Step 14. View Results

a. Results: Create /Deformation.

b. Select Results icon.

c. Select A1:StaticSubcase underSelect Result Cases.

d. Select

Displacements,

Translational underSelect DeformationResult.

e. Show As: Resultant.

f. Apply.

a

b

c

d

e

Step 14. View Results (Cont.)


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Step 14. View Results (Cont.)

a. Results: Create /Fringe.

b. Select A1:StaticSubcase underSelect Result Cases.

c. Select StressTensor under SelectFringe Result.

d. Quantity: X

Component.e. Select Plot Options

button.

f. CoordinateTransformation:

Global.

g. Apply.

a

b

c

d

e

f

Step 15. Stress Results and Save a Copy of the Database


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p py

Display X component of stress

fringe plot. Save a copy of thisdatabase for use later for atransient simulation.

a. File / Save a Copy as...

b. File name:

cant_beam_transient.db.c. Save.

d. File / Quit.

a

d

day2 cant beam 2d

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