thermal coating project
TRANSCRIPT
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Kaushik N Tirakannavar
Department of Mechanical and Aerospace Engineering, Carleton University
Dr. Kuiying Chen
Research Officer, National Research Council, Ottawa, Canada
Under the guidance of
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Outline
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Introduction
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Introduction
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Failure Mechanisms
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Types of imperfections
The imperfections cause normal stresses to be developed at the interface which nucleate separations
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Role of imperfection on buckling
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Role of imperfections on nucleation and buckling
The influence of imperfections on buckling is given by Von Karman nonlinear plate equations.
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Von Karman nonlinear equations
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dXWWWn
mWWWn
]2[31
)2()2(
0
2/
0
22
2
022
))2cos(1(2 0
0 LXL
hW b
(1)
(2)
(3)
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Equation solution procedure
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Symbolic Integration in MATLAB
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Trapezoidal rule:
Simpson’s rule:
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Bisection method of numerical analysis
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Results and Discussion
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Variation of Energy Release Rate
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Gmin is equal to the interface toughness of the material
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Effect of imperfection amplitude
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Effect of critical imperfection length
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Experimental data from SEM
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Isothermal conditions at 11000C
t = 100 hours
t = 500 hours
Initial crack formation Crack propagation
Spallation of thermal coating
t = 50 hours
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Cyclic conditions for 200 cycles
Spallation of thermal coatings
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Future Scope
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Conclusion
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