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Article: Mobility of non-planar screw dislocations ahead of a mode III crack tip

TitleMobility of non-planar screw dislocations ahead of a mode III crack tip
Authors
Issue Date1999
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/mechmat
Citation
Mechanics Of Materials, 1999, v. 31 n. 6, p. 367-379 How to Cite?
AbstractThe generalized Peierls-Nabarro model is used to study the transformation of screw dislocation cores from the three-fold, non-planar state to the planar, glissile state ahead of a mode III crack tip. The image effects of the crack result in extended dissociation on slip planes that are inclined with respect to the crack plane. The conversion to the planar state, however, is made easier by the crack opening when compared with the crack-free situation. The results suggest that there exists a critical stress intensity factor Kmc of the order of approximately 0.12 μ√b (μ = shear modulus, b = Burgers vector), such that if the applied stress intensity factor is larger than this value, all dislocations ahead of the crack tip would be planar and mobile. Kmc is found to be lower than the critical stress intensity factor for nucleation from crack-tip, and so crack-tip emission is nucleation rather than mobility controlled.
Persistent Identifierhttp://hdl.handle.net/10722/156506
ISSN
2015 Impact Factor: 2.636
2015 SCImago Journal Rankings: 1.311
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorNgan, AHWen_US
dc.contributor.authorZhang, HFen_US
dc.date.accessioned2012-08-08T08:42:43Z-
dc.date.available2012-08-08T08:42:43Z-
dc.date.issued1999en_US
dc.identifier.citationMechanics Of Materials, 1999, v. 31 n. 6, p. 367-379en_US
dc.identifier.issn0167-6636en_US
dc.identifier.urihttp://hdl.handle.net/10722/156506-
dc.description.abstractThe generalized Peierls-Nabarro model is used to study the transformation of screw dislocation cores from the three-fold, non-planar state to the planar, glissile state ahead of a mode III crack tip. The image effects of the crack result in extended dissociation on slip planes that are inclined with respect to the crack plane. The conversion to the planar state, however, is made easier by the crack opening when compared with the crack-free situation. The results suggest that there exists a critical stress intensity factor Kmc of the order of approximately 0.12 μ√b (μ = shear modulus, b = Burgers vector), such that if the applied stress intensity factor is larger than this value, all dislocations ahead of the crack tip would be planar and mobile. Kmc is found to be lower than the critical stress intensity factor for nucleation from crack-tip, and so crack-tip emission is nucleation rather than mobility controlled.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/mechmaten_US
dc.relation.ispartofMechanics of Materialsen_US
dc.titleMobility of non-planar screw dislocations ahead of a mode III crack tipen_US
dc.typeArticleen_US
dc.identifier.emailNgan, AHW:hwngan@hkucc.hku.hken_US
dc.identifier.authorityNgan, AHW=rp00225en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0167-6636(99)00006-Xen_US
dc.identifier.scopuseid_2-s2.0-0032679333en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0032679333&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume31en_US
dc.identifier.issue6en_US
dc.identifier.spage367en_US
dc.identifier.epage379en_US
dc.identifier.isiWOS:000081017400001-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridNgan, AHW=7006827202en_US
dc.identifier.scopusauthoridZhang, HF=7409198080en_US

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