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Media type:
E-Article
Title:
Microstructural mechanisms of cyclic deformation, fatigue crack initiation and early crack growth
Contributor:
Mughrabi, Haël
Published:
The Royal Society, 2015
Published in:
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 373 (2015) 2038, Seite 20140132
Language:
English
DOI:
10.1098/rsta.2014.0132
ISSN:
1364-503X;
1471-2962
Origination:
Footnote:
Description:
In this survey, the origin of fatigue crack initiation and damage evolution in different metallic materials is discussed with emphasis on the responsible microstructural mechanisms. After a historical introduction, the stages of cyclic deformation which precede the onset of fatigue damage are reviewed. Different types of cyclic slip irreversibilities in the bulk that eventually lead to the initiation of fatigue cracks are discussed. Examples of trans- and intercrystalline fatigue damage evolution in the low cycle, high cycle and ultrahigh cycle fatigue regimes in mono- and polycrystalline face-centred cubic and body-centred cubic metals and alloys and in different engineering materials are presented, and some microstructural models of fatigue crack initiation and early crack growth are discussed. The basic difficulties in defining the transition from the initiation to the growth of fatigue cracks are emphasized. In ultrahigh cycle fatigue at very low loading amplitudes, the initiation of fatigue cracks generally occupies a major fraction of fatigue life and is hence life controlling.