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REVIEW ARTICLES: Session VII: Inspection and Monitoring

Life Extension of High Temperature Components

[+] Author and Article Information
B. F. Dyson

Division of Materials Applications, National Physical Laboratory, Teddington, Middlesex TW11 OLW, UK

F. A. Leckie

Department of Mechanical and Environmental Engineering, University of California, Santa Barbara CA 93106

Appl. Mech. Rev 46(5), 229-231 (May 01, 1993) (3 pages) doi:10.1115/1.3120343 History: Online April 29, 2009

Abstract

Power producing plant operating at high temperature are designed for finite life. This is necessary because the operating conditions are sufficiently high to cause continuous growth of material damage. Failure occurs when damage reaches a critical value. Design is based on stress levels with an appropriate factor of safety. Since life is dependent on a strongly non-linear function of stress the actual life can be many times greater than the design life. In these circumstances it is then natural to explore the possibility of extending the working life. To increase the working life it is necessary to decrease the factor of safety, but it may be possible to follow this course of action provided the growth of physical damage is carefully monitored. In this paper creep damage mechanisms are reported and growth laws are proposed.

Copyright © 1993 by American Society of Mechanical Engineers
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