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RESEARCH PAPERS

A Mechanistic Model for Time-Dependent Fatigue

[+] Author and Article Information
S. Majumdar, P. S. Maiya

Materials Science Division, Argonne National Laboratory, Argonne, Ill. 60439

J. Eng. Mater. Technol 102(1), 159-167 (Jan 01, 1980) (9 pages) doi:10.1115/1.3224774 History: Received April 02, 1979; Online September 15, 2009

Abstract

Elevated-temperature failure of structural materials (e.g., austenitic stainless steels, low-alloy steels) used in energy-conversion systems can occur by fatigue, creep, or by interactive processes involving creep, fatigue, and environment. The fracture surfaces of these materials exhibit a variety of microstructural features depending upon the type of material, strain rate, temperature, environment, hold times, and sequence of waveshapes. These microstructural observations have been used as a guide in the formulation of generalized damage-rate equations that include interaction between a crack and cavities in a given environment. Crack-propagation rate as well as total life of a fatigue specimen have been calculated by integrating the damage-rate equations over the inelastic strain history of the specimen, and compared with experimental results.

Copyright © 1980 by ASME
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