Original title: Fatigue crack initiation — the role of point defects
Authors: Polák, Jaroslav ; Man, Jiří
Document type: Papers
Conference/Event: International Colloquim Mechanical Fatigue of Materials - ICMFM /16./, Brno (CZ), 2012-09-24 / 2012-09-26
Year: 2012
Language: eng
Abstract: The role of point defects in the formation of surface relief and in the initiation of a fatigue crack in crystalline materials is analyzed. The dislocation interactions in the bands of intensive cyclic slip are specified and relations describing the formation and annihilation of interstitial and vacancy type defects are derived. The formation, annihilation and migration of point defects is proposed to be responsible for the mass redistribution within PSB and between PSB and the matrix boundary. The redistribution of the matter results in local tensile and compressive stresses that are relaxed by continuous dislocation movement within PSB and lead to the formation of characteristic surface relief in the form of extrusions and intrusions.
Keywords: crack initiation; extrusion; fatigue; intrusion
Project no.: GAP108/10/2371 (CEP)
Funding provider: GA ČR
Host item entry: Proceedings of the 16th International Colloquium Mechanical Fatigue of Materials, ISBN 978-80-87434-05-5

Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0216728

Permalink: http://www.nusl.cz/ntk/nusl-136081


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