Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 91, Issue -, Pages 294-303Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2016.02.021
Keywords
Crack initiation; Persistent slip band; Point defects; Extrusions; Intrusions
Funding
- CEITEC (Central European Institute of Technology) [CZ.1.05/1.1.00/02.0068]
- Grant Agency of the Czech Republic [RVO: 68081723, 13-23652S, 13-32665S]
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Results of the study of the early fatigue damage in a number of model and structural crystalline materials using modern experimental techniques are presented. The dislocation structure of the persistent slip bands and the evolution of the surface relief resulting in the formation of persistent slip markings during cyclic loading are documented. The dislocation mechanisms leading to production of point defects in cyclic loading are described and point defect production and annihilation rates are derived. The kinetics of point defect migration is characterized. The physically based models of the surface relief formation describing the formation of extrusions and intrusions are presented. The models are confronted with experimental evidence. It is concluded that intrusions representing sharp surface crack-like defects play the principal role in the initiation of fatigue cracks. (C) 2016 Elsevier Ltd. All rights reserved.
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