workshop 9a 2½ d clamp – sweep mesher · 2½ d clamp – sweep mesher. ws9a-2 nas120, workshop...

WORKSHOP 9A

2½ D CLAMP – SWEEP MESHER


Workshop ObjectivesPractice the construction of a 2 ½ D solid model by sweeping 2D elements.


Problem DescriptionAnalyze the clamp shown below:

60 mm

100 mm150 mm

200 mm

30 mm

30 mm

50 mmR = 10 mm


Problem Description (cont.)A pressure loading of 1 N/mm2 is applied to the top face.Constrain the bolt hole in all three translations.Material Properties:

E = 109 x 103 N/mm2

ν =0.3


Suggested Exercise Steps1. Create a new database. 2. Create surface geometry. 3. Mesh the surface to create CQUAD4 plate elements.4. Sweep the plate elements into solid elements. 5. Create a boundary condition.6. Create a pressure load.7. Define material properties.8. Create Physical Properties.9. Run the finite element analysis using MSC.Nastran.10. Plot displacements and stresses.


b c

d

f

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h

Step 1. Create New Database

Create a new database called clamp.db

a. File / New.b. Enter clamp as the file name.c. Click OK.d. Choose Tolerance Based on

Model.e. Enter 200 for the Approximate

Maximum Model Dimension.f. Select MSC.Nastran as the

Analysis Code.g. Select Structural as the

Analysis Type. h. Click OK.

a

e


Step 2. Create Surface Geometry

Create the first surfacea. Geometry: Create /

Surface / XYZ.b. Enter <150 100 0> for the

Vector Coordinate List.c. Click Apply.

a

b

c


Step 2. Create Surface Geometry

Add a hole to the surfacea. Geometry: Edit /

Surface / Add Hole.b. Enter 10 for the Hole

Radius.c. Click in the Surface

box.d. Screen Pick Surface 1.e. Enter [50 50 0] for the

Center Point List.f. Click Apply.

a

b

c

ed

f


Step 2. Create Geometry

a

c

Create another surfacea. Geometry: Create /

Surface / XYZ.b. Enter <50 100 0> for the

Vector Coordinate List.c. Click in the Origin

Coordinates List box.d. Screen Pick the lower right

corner of the magenta surface as origin as shown. b

d


Step 3. Create Mesh

Create a surface mesha. Elements: Create /

Mesh / Surface.b. Set the Mesher to

Paver.c. Click on Paver

Parameters.d. Set the Max h/L value

to 0.05.e. Click OK.f. Click in the Surface

List box.g. Rectangular pick both

surfaces. h. Set the Global Edge

Length to 10.i. Click Apply.

a

b

df

g

h

i

e

c


Step 3. Create Mesh

View the meshed surfacea. Click on the Iso 3 View

Icon.

a


Step 4. Create Solid Elements

Sweep the plate elements into solid elements.

a. Elements: Sweep / Element / Extrude.

b. Click Mesh Control.c. Set the Number of

Elements to 6.d. Click OK.e. Set the Direction Vector

to <0 0 1>.f. Set the Extrude

Distance to 30.g. Click in the Base Entity

List box.h. Pick the Polygon tool

and pick the 2D elements as shown.

i. Click Apply.

a

c

ed

f

h

g

i

b

h



Sweep the plate elements into solid elements.

a. Elements: Sweep / Element / Extrude.

b. Click Mesh Control.c. Set the number of

elements to 12.d. Click OK.e. Set the Direction Vector

to <0 0 1>.f. Set the Extrude

Distance to 60.g. Click in the Base Entity

List box.h. Pick the Polygon tool

and pick the rest of the 2D elements as shown.

i. Click Apply.

a

c

ed

f

h

g

i

b

h


Delete the plate elementsa. Elements: Delete /

Element.b. Pick the Quad Element

Filter.c. Rectangular pick all

elements.d. Click Apply.


a

b

c

d



Verify element boundariesa. Elements: Verify /

Element / Boundaries.b. Click Apply. a

b



Equivalence the modela. Elements: Equivalence

/ All / Tolerance Cube.b. Click Apply.

a

b



Verify element boundaries again

a. Elements: Verify / Element / Boundaries.

b. Click Apply.a

b


Step 5. Create Boundary Condition

Set Picking Preferencesa. Select Preferences /

Picking b. Choose Enclose

Centroid for Rectangle/Polygon Picking.

c. Click Close.

a

b

c



Create the boundary conditiona. Loads/BCs: Create /

Displacement / Nodal.b. Enter bolt_hole as the

New Set Name.c. Click Input Data.d. Enter <0 0 0> for

Translations e. Click OK.

a

b

c

d

e


Apply the boundary conditiona. Click Select

Application Region.b. For the Geometry

Filter select FEM.c. Click on Front View

Icon.d. Zoom in using View

Corners.e. Polygon pick nodes

on the bolt hole.f. Click Add.g. Click OK. h. Click Apply.


g

h

c

f

b

cd

a

e


a

Step 6. Create Load

Create the pressure loada. Loads/BCs: Create /

Pressure / Element Uniform.

b. Enter clamp_pressure as the New Set Name.

c. Click Input Data.d. Enter 1 for the Pressure.e. Click OK.

b

e

d

c


Apply the pressure loada. Click Select

Application Region.b. For the Geometry

Filter select FEM.c. Click on Bottom View

Icon.d. Click on Fit View Icon.e. Rectangular pick the

top surface of solid elements as shown.

f. Click Add.g. Click OK. h. Click Apply.

Step 6. Create Load

a

b

cd

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f

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h


Step 7. Define Material Properties

Create an isotropic materiala. Materials: Create / Isotropic

/ Manual Input.b. Enter titanium as the

Material Name.c. Click Input Properties.d. Enter 109e3 for the elastic

modulus and 0.3 for the Poisson Ratio.

e. Click OK. f. Click Apply.

a

b

c

d

fe


Step 8. Create Physical Properties

Create element propertiesa. Properties: Create / 3D /

Solid.b. Enter solid as the Property

Set Name.c. Click Input Properties.d. Click on the Select

Material Icon.e. Select titanium as the

material.f. Click OK.

d

e

f

a

b

c


Step 8. Create Physical Properties

Apply the element propertiesa. Click in the Select

Members box.b. Select the Solid Element

filter.c. Rectangular pick all

elements as shown.d. Click Add.e. Click Apply.

c

b

a

d

e


Step 9. Run Linear Static Analysis

Choose the analysis typea. Analysis: Analyze / Entire

Model / Full Run.b. Click Solution Type.c. Choose Linear Static.d. Click OK. e. Click Apply.

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e

b

d

c


Step 10. Plot Displacements and Stresses

Attach the results filea. Analysis: Access Results /

Attach XDB / Result Entities.

b. Click Select Results File.c. Choose the results file

clamp.xdb.d. Click OK. e. Click Apply.

a

b

c

e

d


Step 10. Plot Displacements and Stresses

Create a deformation plot for the mid span result case

a. Results: Create / Quick Plot.

b. Select Stress Tensoras the Fringe Result.

c. Select Von Mises as the Fringe Result Quantity.

d. Select Displacements, Translational as the Deformation Result.

e. Click Apply.

a

d

c

e

b

workshop 9a 2½ d clamp – sweep mesher · 2½ d clamp – sweep mesher. ws9a-2 nas120, workshop...

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