The discrete nature of the growth and arrest of microstructurally short fatigue cracks modelled by dislocation technique

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The discrete nature of the growth and arrest of microstructurally short fatigue cracks modelled by dislocation technique

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Publication Article, peer reviewed scientific
Title The discrete nature of the growth and arrest of microstructurally short fatigue cracks modelled by dislocation technique
Author(s) Bjerkén, Christina
Date 2005
English abstract
Growth of a microstructurally short edge crack in the neighbourhood of a grain boundary has been studied using a dislocation technique. Influence of the distance between the crack tip and a high-angle grain boundary was studied for 5000 load cycles. Growth rate was found to change stepwise during crack advance, both accelerating and decelerating, and finally retarding before crack arrest. Crack propagation is ruled by the competition between the shielding effect from the dislocations in the plastic zone and the stress field increase due to crack extension, and clearly shows a discrete behaviour at growth below the fatigue threshold load.
DOI http://dx.doi.org/10.1016/j.ijfatigue.2004.06.012 (link to publisher's fulltext)
Publisher Elsevier
Host/Issue International Journal of Fatigue;1
Volume 27
Pages 21-32
Language swe (iso)
Subject(s) short crack growth
grain boundary
dislocation
crack arrest
Technology
Research Subject Categories::TECHNOLOGY::Materials science
Handle http://hdl.handle.net/2043/4904 (link to this page)

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