WORKSHOP 2 Solid Shell Composites Modeling

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Composites Technology Day, February 2012

Copyright 2012 MSC.Software Corporation

WORKSHOP 2

Solid Shell Composites Modeling

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• Workshop Objectives – Become familiar with setting up a solid composite shell model

• Software Version

– Patran 2011

– MD Nastran 2011.1

• Files Required

– solid_shell.db

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• Problem Description

– Simulate a three-point-bending composite test specimen using solid

composite shell elements

– Due to symmetry, only a quarter of the specimen is modeled.

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Material Name % Thickness Orientation

1 Ortho1 1e-3 0

2 Ortho1 9.999 0

3 Ortho1 10 90

4 Ortho1 10 0

5 Ortho1 40 90

6 Ortho1 10 0

7 Ortho1 10 90

8 Ortho1 9.999 0

9 Ortho1 1e-3 0

• Problem Description (cont.)

– You will build a laminate by entering each ply thickness as a percentage of

the total thickness

– Two very thin outer plies are used to pick up stresses at the outside faces of

the part.

Stress recovery ply

Stress recovery ply

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a

Step 1. Open an existing Patran Database

Start Patran and open a database

containing the composite coupon:

a. Click File Open in the Defaults

group.

b. Select solid_shell.db as the

File name.

c. Click OK.

c

b

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Plot loads and boundary

conditions:

a. Click the Loads/BCs tab.

b. Set Action to Plot Markers.

c. Select Displ_simple_bc

and click Apply. This plots

the simple support in the

vertical direction.

d. Select Displ_sym1 and

click Apply. This plots the

X symmetry constraints.

e. Select Displ_sym2 and

click Apply. This plots the

Y symmetry constraints.

f. Select Force_force1 and

Force_force2 and click

Apply. This plots the

applied load.

g. Click Reset Graphics to

clear the markers.

Step 2. Review Loads and Boundary Conditions a

b

c

d e

f

g

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Verify the element coordinates

systems:

a. Click the Meshing tab.

b. Set action to Show.

c. Set Object to Element.

d. Set Info to Coord. Sys.

e. Click on any element to

review the element

coordinate system.

f. Click on a few more

elements to review the

element coordinate system.

Make a mental note of the

element Z direction.

g. Click Reset Graphics.

Step 3. Verify Element Coordinate System a

b

c

d

e

g

f

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Step 4. Create Material Property

Create a material property:

a. Click the Properties tab.

b. Click 3D in the Orthotropic group.

c. Name the Material ortho1

d. Click on Input Properties

e. Enter the values shown.

f. Click OK.

g. Click Apply.

b

c

e

f

g

d

a

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Step 5. Define the Composite Layup

Create a Laminated Composite:

a. In the Properties tab, click

Laminate in the Composite

group.

b. Name the Material lam1.

c. Click on ortho1 9 times to

create 9 rows in the table

d. Select “Total-%thickness”

from the Stacking Sequence

Convention

e. Click in the first %thickness cell

f. Click in the Input Data field and

enter 0.001 and press the

Enter key.

g. Repeat step f to enter all ply %

thickness values as shown on

the right. Make sure the total

percentage is 100 when you

are done.

h. Click in the first Orientation cell

i. Enter the ply angles one at a

time as shown.

j. Click Apply.

b

c

e

a

d

c

e

f g

h

i

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Step 6. Create Solid Property

Create 3D solid property:

a. In the Properties tab, click

Solid in the 3D Properties

group. (you may have to move

the Laminated Composite

form out of the way).

b. For Property Set Name, enter

3d-comp.

c. Change Options to Laminate.

d. Click Input Properties…

e. Click Material Prop Name icon

and select lam1.

f. Click in the Material

Orientation box, then screen

select Coord 1.

g. For Thickness Direction 3D,

select Element Z Direction.

h. In SCOMP Integration

Scheme, select Assumed

Strain.

i. Click OK.

a

c

b

d

e

f

e

f

g

h

i

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Step 6. Create Solid Property (Cont.)

Create 3D solid property:

a. Click Select Application

Region …

b. Rectangle select both solids.

c. Click Add.

d. Click OK.

e. Click Apply.

a

c

d

e

b

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Step 7. Set up Analysis

Select solution type:

a. Click the Analysis tab.

b. Enter

three_point_bending for

Job Name.

c. Click on Solution Type.

d. Select Implicit Nonlinear.

e. Click Solution

Parameters.

f. Check Shell Shear

Correction and SOL 400

Run.

g. Click OK.

h. Click OK.

b

d

e

f

g

h

a

c

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Step 7. Set up Analysis (Cont.)

Define subcase parameters:

i. Click Subcases.

j. Select Default

k. Click Subcase

Parameters.

l. Set Linearity to Linear.

m. Click OK.

n. Click Apply.

o. Click Cancel.

p. Click Apply.

The analysis will take less

than a minute to run.

i

j

l

m

k

n o p

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Step 8. Attach Results

Attach the results file:

a. Click MASTER / DBALL in the

Access Results group.

b. Click on Select Results File.

c. Select the results file

three_point_bending.MASTER.

d. Click OK.

e. Click Apply.

a

b

c

d

e

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Step 9. Plot Results

Plot deformation:

a. Click the Results tab.

b. Click the Deformation icon.

c. Select Displacement,

Translational for

Deformation Result.

d. Click Apply.

c

d

a

b

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Step 9. Plot Results (cont.)

Plot stresses:

a. Click the Fringe icon.

b. Select Composite Stress, Ply

Stress for Fringe Result.

c. Set Position to Layer 1 at

middle.

d. Set Quantity to X Component.

e. Click Apply.

b

e

a

c

d

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End of Workshop 2

File/Quit to exit Patran.

WORKSHOP 2 Solid Shell Composites Modeling

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