Three-orthogonal-direction stress mapping around a fatigue-crack tip using neutron diffraction

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DOIResolve DOI: http://doi.org/10.1007/s11661-011-0904-8
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TypeArticle
Journal titleMetallurgical and Materials Transactions A
ISSN1073-5623
1543-1940
Volume43
Issue8
Pages27852791; # of pages: 7
AbstractQuantitative determination of the stress fields around the crack tip is a challenging and important subject to understand the fatigue crack-growth mechanism. In the current study, we measured the distribution of residual stresses and the evolution of the stress fields around a fatigue crack tip subjected to the constant-amplitude cyclic loading in a 304L stainless steel compact-tension (CT) specimen. The three orthogonal stress components (i.e., crack growth, crack opening, and through thickness) of the CT specimen were determined as a function of distance from the crack tip with 1-mm spatial resolution along the crack-propagation direction. In-situ neutron-diffraction results show that the enlarged tensile stresses were developed during loading along the through-thickness direction at a localized volume close to the crack tip, resulting in the lattice expansion in all three orthogonal directions during P max. The current study suggests that the atypical plane strainlike behavior observed at the midthickness position might be the reason for the mechanism of the faster crack-growth rate inside the interior than that near the surface.
Publication date
LanguageEnglish
AffiliationNRC Canadian Neutron Beam Centre; National Research Council Canada
Peer reviewedYes
Identifier904
NPARC number21268419
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Record identifier3e5d53c5-2f21-4529-b6a7-d9b9552a0a75
Record created2013-07-10
Record modified2016-05-09
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