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RESEARCH PAPERS

An Engineering Approach to the Prediction of Creep Crack Growth

[+] Author and Article Information
K. M. Nikbin, G. A. Webster

Department of Mechanical Engineering, Imperial College, London SW7 2BX, England

D. J. Smith

The Welding Institute, Abington Hall, Abington, Cambridge CB1 6AL

J. Eng. Mater. Technol 108(2), 186-191 (Apr 01, 1986) (6 pages) doi:10.1115/1.3225859 History: Received April 29, 1985; Online September 15, 2009

Abstract

This paper is concerned with assessing the integrity of cracked engineering components which operate at elevated temperatures. Fracture mechanics parameters are discussed for describing creep crack growth. A model is presented for expressing growth rate in terms of creep damage accumulation in a process zone ahead of the crack tip. Correlations are made with a broad range of materials exhibiting a wide spread of creep ductilities. It is found that individual propagation rates can be predicted with reasonable accuracy from a knowledge only of the material uni-axial creep ductility. An engineering creep crack growth assessment diagram is proposed which is independent of material properties but which is sensitive to the state of stress at the crack tip. Approximate bounds are presented for plane stress and plane strain situations and it is shown that crack growth rates about fifty times faster are expected under plane strain conditions than when plane stress prevails.

Copyright © 1986 by ASME
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