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Fracture at High Temperatures Under Cyclic Loading

Fracture at High Temperatures Under Cyclic Loading Metal fatigue is an everyday problem. It has been brought to the attention of the general public by frontpage newspaper stories. Textbook writers commonly choose the very homliest of examples to introduce the topic (1). Fracture of metals under cyclic loading at ordinary temperatures remains, after over a hundred years (2) of intense study, probably the major single materials problem in fracture-safe design. The fracture of metals at high temperatures has been studied for a rather shorter time (3) and certainly less intensely. It is a complex problem, and materials engineering has by no means perfected useful high-temperature fracture criteria even for uniaxial loading under monotonic conditions. It is no surprise to find that Symbols: Crack length Diffusion coefficient D DB Grain boundary diffusion coefficient DB D at zero stress DoB Pre-exponential term in grain boundary diffusion coefficient E Young's modulus Boltzmann's constant k Cyclic work hardening exponent n Number of cycles N NJ Fatigue life Activation enthalpy Q Cavity radius y Time IX 1 tf T Creep life Absolute temperature f3 Coffin Manson exponent Grain boundary energy YP Surface energy y, Strain e Yield strain By Doe Strain range of fatigue cycle Doee Elastic strain range Doep http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Materials Research Annual Reviews

Fracture at High Temperatures Under Cyclic Loading

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Publisher
Annual Reviews
Copyright
Copyright 1978 Annual Reviews. All rights reserved
Subject
Review Articles
ISSN
0084-6600
DOI
10.1146/annurev.ms.08.080178.001315
Publisher site
See Article on Publisher Site

Abstract

Metal fatigue is an everyday problem. It has been brought to the attention of the general public by frontpage newspaper stories. Textbook writers commonly choose the very homliest of examples to introduce the topic (1). Fracture of metals under cyclic loading at ordinary temperatures remains, after over a hundred years (2) of intense study, probably the major single materials problem in fracture-safe design. The fracture of metals at high temperatures has been studied for a rather shorter time (3) and certainly less intensely. It is a complex problem, and materials engineering has by no means perfected useful high-temperature fracture criteria even for uniaxial loading under monotonic conditions. It is no surprise to find that Symbols: Crack length Diffusion coefficient D DB Grain boundary diffusion coefficient DB D at zero stress DoB Pre-exponential term in grain boundary diffusion coefficient E Young's modulus Boltzmann's constant k Cyclic work hardening exponent n Number of cycles N NJ Fatigue life Activation enthalpy Q Cavity radius y Time IX 1 tf T Creep life Absolute temperature f3 Coffin Manson exponent Grain boundary energy YP Surface energy y, Strain e Yield strain By Doe Strain range of fatigue cycle Doee Elastic strain range Doep

Journal

Annual Review of Materials ResearchAnnual Reviews

Published: Aug 1, 1978

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