WS06_VCCT

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NAS113, Workshop 6, April 2011

Copyright 2011 MSC.Software Corporation

WORKSHOP 6VCCT – Double Cantilever Beam

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Objectives

• Workshop Objectives

– Perform a VCCT analysis on DCB.

– Review boundary conditions and contact bodies.

– Edit input file to add VCCT entries.

– Post process results.

• Software Version

– Patran 2010.2

– MD Nastran 2010

• Required File:

– NAS113-VCCT.db

– DCB-VCCT_modified.bdf

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Problem Description

• Two composite cantilever beams are glued together with initial crack.

• One end of the beams is fixed and the other is forced to separate.

• This is a modeI crack propagation, fracture toughness is set to 1.2.

Open

Crack Front Glued Contact

Fixed

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Suggested Exercise Steps

1. Review the model and create input deck in Patran.

2. Edit file “dcb-vcct.bdf” to add VCCT entries.

3. Submit the model to MD Nastran for analysis.

4. Import results into Patran.

5. Post-process results.

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Step 1. Review the Model – Boundary Conditions

– Start Patran and Open NAS113-VCCT.db

– Review boundary conditions (Load/BCs/Plot

Marker)

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Step 1. Review the Model – Contact Body

– Review contact bodies(Load/BCs/Plot Contours/Contact)

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Step 1. Review the Model – Material– Review materials (Materials/Show/Composite)

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Step 1. Review the Model – Contact Table– Review contact table (Analysis/Subcases/Subcase Param/Contact Table)

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Step 1. Review the Model – Contact Table– Review contact table (Analysis/Subcases/Subcase Param/Contact Table)

Glued Contact

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Step 2. Create Input File

– Analysis/Entire Model/Analysis Deck

– Select DCB-VCCT under Available Jobs and click Apply

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– Add the VCCT entries into DCB-VCCT.bdf

– Completed input deck: DCB-

VCCT_modified.bdf

Step 3. Edit Input File “DCB-VCCT.bdf”

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Step 4. Submit the Model to MD Nastran for Analysis

• In Windows,

– Double click the MD Nastran icon on the desktop.

– Browse and select DCB-VCCT_modified.bdf.

– click Open and Run (This job will run several minutes).

– Open DCB-VCCT.sts file to check the job status – normal completion if job

ends with exit number 0.

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Step 5. Attach Results File

Access Results file:

a. Select Analysis: Access

Results/ Attach

MASTER/ Result

Entities.

b. Click on Select Results

File….

c. Browse to the working

directory and select

DCB-VCCT.master.

d. Click OK.

e. Click Apply.

a

b

c

d

e

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Step 6. Display Contact Status

Display contact status:

a. Select Results: Create/ Quick

Plot.

b. Select all increments except

the first one under Select Result

Cases.

c. Select Contact Status under

Select Fringe Result.

d. Select Displacement

Translational under Select

Deformation Result.

e. Click Fringe Attributes icon

f. Select Element Edges for

Display.

g. Click Deform Attributes icon.

h. Select True Scale.

i. Uncheck Show Underformed.

j. Click Apply.

c

d

e

f

a

g b

h

i

j

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Step 6. Display Contact Status (Cont.)

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Step 7. Display Load-Deflection Curve

d

ef

i

g

a

b

h

c

Display load-deflection curve:

a. Select Results: Create/

Graph/Y vs X.

b. Select all increments except

the first one under Select

Result Cases.

c. Select Constraint Forces

Translational under Select Y

Result.

d. Select Z Component Quantity.

e. Select X: Result.

f. Click on Select X Result….

g. Select Displacements,

Translational under Select X

Result.

h. Select Z Component Quantity

i. Click OK.

j. Click the Target Entities icon.

k. Enter Node 8628 under Select

Nodes.

l. Click Apply.

j

k

l

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Step 7. Display Load-Deflection Curve (Cont.)

WS06_VCCT

Documents

analysissubcasessubcase

display contact

select result

add vcct entries

md nastran

display load

select results

deflection