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RESEARCH PAPERS

Transient Thermal Load Effects on Coatings Bonded to Cylindrical Substrates and Containing Circumferential Cracks

[+] Author and Article Information
K. Kokini

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

T. R. Hornack

Aluminum Company of America, Alcoa Technical Center, Alcoa Center, PA 15069

J. Eng. Mater. Technol 110(1), 35-40 (Jan 01, 1988) (6 pages) doi:10.1115/1.3226007 History: Received July 06, 1987; Online September 15, 2009

Abstract

The effect of a transient thermal load on a coating which is bonded to a cylindrical substrate is analyzed using fracture mechanics by considering the presence of a circumferential edge crack normal to the inner boundary of the coating. The solution is obtained using the finite element method and is compared to the exact solution of the problem. The analysis is then used to show that smaller heat transfer rates at the boundary result in smaller stress intensity factors. For three different materials combinations, including two ceramic coatings on metal, the nondimensional stress intensity factor has a similar magnitude for short crack lengths, but varies appreciably as the crack length becomes longer. It is also determined that inner coatings result in smaller or comparable stress intensity factors than thicker ones.

Copyright © 1988 by ASME
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