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Strain localization and fatigue crack initiation in ultrafine-grained copper in high- and giga-cycle region
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SYSNO ASEP 0434886 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Strain localization and fatigue crack initiation in ultrafine-grained copper in high- and giga-cycle region Author(s) Kunz, Ludvík (UFM-A) RID, ORCID
Lukáš, Petr (UFM-A)
Navrátilová, L. (CZ)Number of authors 3 Source Title International Journal of Fatigue. - : Elsevier - ISSN 0142-1123
Roč. 58, JAN (2014), s. 202-208Number of pages 7 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords Fatigue crack initiation ; Strain localization ; Stability of ultrafine-grained structure ; UFG Cu Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects GAP108/10/2001 GA ČR - Czech Science Foundation (CSF) ED1.1.00/02.0068 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFM-A - RVO:68081723 UT WOS 000328592700024 EID SCOPUS 84887218505 DOI 10.1016/j.ijfatigue.2013.04.027 Annotation Initiation of fatigue cracks and early crack propagation in high-cycle and giga-cycle region in ultrafine-grained copper prepared by equal channel angular pressing was experimentally investigated. The cyclic slip localization takes place in cyclic slip bands whose length substantially exceeds the grain size. The mechanism of the crack initiation under load controlled cycling does not require the dynamic grain coarsening often indicated in literature. Fatigue cracks initiate in slip bands, which develop predominantly in zones of near-by oriented grains. The damage mechanism consists in localized slip resulting in development of cavities and voids arranged along the planes of highest cyclic shear stress and in formation of surface relief. A process of growth and linking of cavities and voids produced by the irreversible cyclic slip by dislocation movement generating point defects governs the early stage of the development of fatigue cracks. Sufficiently large cracks created by this mechanism and lying in suitably oriented long slip bands finally transform into fatigue cracks propagating by common opening mode with a plastic zone generated at their tip. 2013 Elsevier Ltd. All rights reserved. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2015
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