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TECHNICAL PAPERS

Multiple Surface Cracking and Its Effect on Interface Cracks in Functionally Graded Thermal Barrier Coatings Under Thermal Shock

[+] Author and Article Information
S. Rangaraj, K. Kokini

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288

J. Appl. Mech 70(2), 234-245 (Mar 27, 2003) (12 pages) doi:10.1115/1.1533809 History: Received February 26, 2002; Revised July 26, 2002; Online March 27, 2003
Copyright © 2003 by ASME
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Figures

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Architectural layup of functionally graded yttria stabilized zirconia (YSZ)–bond coat alloy (BC) thermal barrier coating (TBC) systems. (All lengths in mm, each layer in nine-layer system is 0.22 mm thick with compositions varying linearly in 10% steps.)
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Surface and interface cracks in the TBC systems and boundary conditions, thermal loads for analyses
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Horizontal crack length (Hc) for the three TBC architectures. (Reproduced from Kokini et al. 28.)
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Thermal conductivity of YSZ–BC alloy composites. (* Experimental data, as received from Caterpillar Inc., Peoria, IL.)
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Elastic stiffness of YSZ–BC alloy composites. (* Experimental data, as received from Caterpillar, Inc., Peoria IL.)
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Normalized stress exponent (n/nBC) and activation energy (ΔH/ΔHBC) for YSZ–BC alloy composites
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Temperature history at the center of the top surface of the TBC
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Temperature distribution through the TBC thickness at the end of heating (t=4 sec)
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Stress distribution along the top surface (y=0) of the nine-layer TBC
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Opening (dv) and sliding (du) displacements for the side surface crack (SC2) in coatings with four surface cracks, each 5% of the TBC thickness in length (aSC/t=0.05)
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J-integral for the side surface crack (SC2) during the heating-cooling cycle (model with four surface cracks, length of each surface crack was 5% of the TBC thickness, aSC/t=0.05)
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Steady-state J-integrals for the surface cracks in models with multiple 5% (aSC/t=0.05) surface cracks (SCs)
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Effect of top-layer thickness on J-integral for side-surface cracks in the three-layer TBC
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Effect of top-layer thickness on J-integral for side-surface cracks in the nine-layer TBC
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Strain energy release rate for the TBC–bond coat interface crack during the heating-cooling cycle in coatings with one 50% (aSC/t=0.5) center surface crack
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Steady-state strain energy release rates for the interface cracks in coatings with 50% (aSC/t=0.50) surface cracks
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Effect of surface crack length on the strain energy release rates for the interface cracks (arrows indicate pertinent y-axis)

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