ws06_vcct
TRANSCRIPT
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NAS113, Workshop 6, April 2011
Copyright 2011 MSC.Software Corporation
WORKSHOP 6VCCT – Double Cantilever Beam
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NAS113, Workshop 6, April 2011
Copyright 2011 MSC.Software Corporation
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NAS113, Workshop 6, April 2011
Copyright 2011 MSC.Software Corporation
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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Copyright 2011 MSC.Software Corporation
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.)