modeling of deformation of different layers during the afp process
DESCRIPTION
Modeling of deformation of different layers during the AFP process. Presented By: Hossein Ghayoor Supervised By: Dr. Suong V. Hoa. Introduction. Viscoelastic properties Different properties of each layer Effect of time and temperature - PowerPoint PPT PresentationTRANSCRIPT
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P R E S E N T E D B Y : H O S S E I N G H A Y O O RS U P E R V I S E D B Y : D R . S U O N G V . H O A
MODELING OF DEFORMATION OF DIFFERENT LAYERS DURING THE AFP PROCESS.
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INTRODUCTION
• Viscoelastic properties• Different properties of each layer• Effect of time and temperature• Understanding of residual stress and final state of
material after manufacturing
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INTRODUCTION
Last Layer
Layer 3
Layer 2
Layer 1
Mold
Different Temperature
Different Properties
Viscoelastic Problem
Figure From: Analysis of Process-Induced Residual Stresses in Tape Placement, F. Sonmez, H. T. Hahn, M. Akbulut, J. of Thermoplastic Composite Materials, 2002
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VISCOELASTIC PROPERTIES OF CARBON-PEEK
• Creep Properties of PEEK
• Carbon fiber remains elastic
Figure From: Characterization and modeling of nonlinear viscoelastic response of PEEK resin and PEEK composites, X.R. Xiao, C.C. Hiel, A.H. Cardon, Composite Engineering, 1994
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VISCOELASTIC PROPERTIES OF CARBON-PEEK
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VISCOELASTIC PROPERTIES OF CARBON-PEEK
The increase in number of unit cell columns (horizontal)
The increase in number of unit cell rows (vertical)
Five by five block of unit cell minimizes the effect of boundary conditions
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VISCOELASTIC PROPERTIES OF CARBON-PEEK
Creep/ Relaxation Properties of Carbon-PEEK composite
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HOMOGENIZED PROPERTIES OF CARBON-PEEK
0 10000 20000 30000 40000 50000 60000 700000.00E+00
2.00E-08
4.00E-08
6.00E-08
8.00E-08
1.00E-07
1.20E-07
1.40E-07
1.60E-07
1.80E-07
Time (s)
Cre
ep P
rope
rtie
s (1/
Pa)
Figure From: A thermoviscoelastic analysis of process-induced internal stresses in thermoplastic matrix composites, Sunderland P., Yu W., Manson J., Polymer Composites, 2001
C22
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VISCOELASTIC FINITE ELEMENT
( ,t
ji ijC T t d
01
expt N
ji k
k k
t d
( ,t
jTi ij
v
B C T t B d dv
Formulation:
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NEW BOUNDARY CONDITIONS
Attaching the nodes in the stiffness matrix
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MULTI-LAYER
• Each 8-noded viscoelastic element can represent a unit cell (computational time is many times less)• Different Scenarios can be analyzed• Timing, thickness, temperature can be changed in the analysis
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TYPICAL ANALYSIS RESULT
One-step constant stress (one layer)
two-step constant stress (one layer)
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TYPICAL ANALYSIS RESULT
One-step ramp stress (one layer)
Time(s)
Max
imum
Stra
in
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TYPICAL ANALYSIS RESULT
Depositing second layer
Strain in the first layer (ramp stress)
Time(s)
Max
imum
Stra
in
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TYPICAL ANALYSIS RESULT
Strain in first layer (ramp stress)
Second layer deposited
third layer deposited
fourth layer deposited
fifth layer deposited
Time(s)
Max
imum
Stra
in
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CONCLUSION
• Residual Strain/Stress can be predicted and can be used in manufacturing design to optimize the design. • With developed modeling method different
Scenarios of Manufacturing in terms of Timing, Thickness can be modeled and analyzed.
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THANK YOU!