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Article: Modelling screw dislocation mobility in the bulk and in the vicinity of crack tips using a Peierls-Nabarro approach

TitleModelling screw dislocation mobility in the bulk and in the vicinity of crack tips using a Peierls-Nabarro approach
Authors
KeywordsBCC Metals
Crack Tip Plasticity
Dislocation Theory
Peierls Stress
Issue Date2000
PublisherTrans Tech Publications Ltd. The Journal's web site is located at http://www.scientific.net
Citation
Key Engineering Materials, 2000 n. 180 PART 1, p. 135-140 How to Cite?
AbstractDouble kink generation in three-fold screw dislocations in bcc crystals is studied within the framework of the generalised Peierls-Nabarro (P-N) model in which the partial dislocations are described by non-singular displacement fields. The kink geometry is modelled by dividing the dislocation into elemental slabs, each of which is assumed to have its own 2-D displacement field calculated using the P-N model. The apparent activation energy is predicted to vary with stress in an approximately parabolic manner, and is found to be in good agreement with experimental findings for a wide range of BCC metals. The interaction between a three-fold screw dislocation core and a mode III crack tip is also investigated. The results suggest that the dislocation mobility is sufficiently eased off in front of a crack tip. © 2000 Trans Tech Publications.
Persistent Identifierhttp://hdl.handle.net/10722/75904
ISSN
2005 Impact Factor: 0.224
2015 SCImago Journal Rankings: 0.173
References

 

DC FieldValueLanguage
dc.contributor.authorNgan, AHWen_HK
dc.date.accessioned2010-09-06T07:15:42Z-
dc.date.available2010-09-06T07:15:42Z-
dc.date.issued2000en_HK
dc.identifier.citationKey Engineering Materials, 2000 n. 180 PART 1, p. 135-140en_HK
dc.identifier.issn1013-9826en_HK
dc.identifier.urihttp://hdl.handle.net/10722/75904-
dc.description.abstractDouble kink generation in three-fold screw dislocations in bcc crystals is studied within the framework of the generalised Peierls-Nabarro (P-N) model in which the partial dislocations are described by non-singular displacement fields. The kink geometry is modelled by dividing the dislocation into elemental slabs, each of which is assumed to have its own 2-D displacement field calculated using the P-N model. The apparent activation energy is predicted to vary with stress in an approximately parabolic manner, and is found to be in good agreement with experimental findings for a wide range of BCC metals. The interaction between a three-fold screw dislocation core and a mode III crack tip is also investigated. The results suggest that the dislocation mobility is sufficiently eased off in front of a crack tip. © 2000 Trans Tech Publications.en_HK
dc.languageengen_HK
dc.publisherTrans Tech Publications Ltd. The Journal's web site is located at http://www.scientific.neten_HK
dc.relation.ispartofKey Engineering Materialsen_HK
dc.rightsKey Engineering Materials. Copyright © Trans Tech Publications Ltd.en_HK
dc.subjectBCC Metalsen_HK
dc.subjectCrack Tip Plasticityen_HK
dc.subjectDislocation Theoryen_HK
dc.subjectPeierls Stressen_HK
dc.titleModelling screw dislocation mobility in the bulk and in the vicinity of crack tips using a Peierls-Nabarro approachen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1013-9826&volume=177-180&spage=135&epage=140&date=2000&atitle=Modelling+Screw+Dislocation+Mobility+in+the+Bulk+and+in+the+Vicinity+of+Crack+Tips+using+a+Peierls-Nabarro+Approachen_HK
dc.identifier.emailNgan, AHW:hwngan@hkucc.hku.hken_HK
dc.identifier.authorityNgan, AHW=rp00225en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0345854770en_HK
dc.identifier.hkuros58753en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0345854770&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.issue180 PART 1en_HK
dc.identifier.spage135en_HK
dc.identifier.epage140en_HK
dc.publisher.placeSwitzerlanden_HK
dc.identifier.scopusauthoridNgan, AHW=7006827202en_HK

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