Residual strain distribution around a fatigue-crack tip determined by neutron diffraction

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DOIResolve DOI: http://doi.org/10.4028/www.scientific.net/MSF.706-709.1685
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TypeArticle
Proceedings titleMaterials Science Forum
Conference7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011, 1 August 2011 through 5 August 2011, Quebec City, QC
ISSN0255-5476
ISBN9783037853030
Volume706-709
Pages16851689; # of pages: 5
Subject304L stainless steel; Compact tension; Cyclic loadings; Driving forces; Fatigue crack growth mechanism; Life-prediction methodology; Multiaxiality; Residual strains; Spatial resolution; Crack propagation; Crack tips; Fatigue crack propagation; Fatigue of materials; Growth (materials); Neutron diffraction; Neutrons; Orthogonal functions; Plasticity testing; Poisson distribution; Stainless steel; Strain; Factor analysis; Crack closure; Crack tips
AbstractAn analysis of residual stress, one of the contributory factors to the crack tip driving force, is extremely important to probe the fatigue crack growth mechanism and to further develop the life prediction methodology. Since fatigue crack growth is governed by crack-tip plasticity and crack closure in the wake of the crack tip, the investigation of residual stain/stress field in both behind and in front of the crack tip is crucial. In the current work, a 304L stainless steel compact-tension specimen is pre-cracked under constant-amplitude cyclic loading. Neutron diffraction is employed to directly measure the three orthogonal residual strain fields with 1-mm spatial resolution as a function of distance from the crack tip. The mapping results show that the three orthogonal residual-strain distributions around the crack tip depend on the stress multiaxiality, not following a single Poisson relationship to each axis. © 2012 Trans Tech Publications, Switzerland.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Canadian Neutron Beam Centre (CNBC-CCFN)
Peer reviewedYes
NPARC number21269427
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Record identifier791b62e1-5985-4923-a175-d1f15b06032b
Record created2013-12-12
Record modified2016-05-09
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