Relationship of fatigue crack propagation to dislocation structure and slip geometry

Campbell Laird, Pedro Peralta

Research output: Contribution to journalArticle

Abstract

The mechanisms of fatigue crack propagation were briefly reviewed in relation to Professor McClintock's contributions to the early development of the field. The most securely established understanding has been obtained for those mechanism of propagation involving plasticity-induced geometrical changes to the crack tip during tensile and compressive straining (the plastic blunting process). The roles of more complex factors in controlling the kinetics of crack propagation, which cause the magnitude of the Paris exponent to exceed 2, remain to be elucidated. Recently obtained results revealing the interconnection between the slip behavior at the crack tip, the plastic blunting process and the dislocation structures present in the material before the crack encounters them were reported.

Original languageEnglish (US)
Pages (from-to)367-373
Number of pages7
JournalJisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS
Volume3
Issue number2
StatePublished - Apr 1997
Externally publishedYes

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Fatigue crack propagation
Crack tips
Crack propagation
Plastics
Geometry
Plasticity
Cracks
Kinetics

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering

Cite this

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AB - The mechanisms of fatigue crack propagation were briefly reviewed in relation to Professor McClintock's contributions to the early development of the field. The most securely established understanding has been obtained for those mechanism of propagation involving plasticity-induced geometrical changes to the crack tip during tensile and compressive straining (the plastic blunting process). The roles of more complex factors in controlling the kinetics of crack propagation, which cause the magnitude of the Paris exponent to exceed 2, remain to be elucidated. Recently obtained results revealing the interconnection between the slip behavior at the crack tip, the plastic blunting process and the dislocation structures present in the material before the crack encounters them were reported.

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