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Article: Mobility of non-planar screw dislocations ahead of a mode III crack tip
Title | Mobility of non-planar screw dislocations ahead of a mode III crack tip |
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Authors | |
Issue Date | 1999 |
Publisher | Elsevier 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? |
Abstract | The 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 Identifier | http://hdl.handle.net/10722/156506 |
ISSN | 2023 Impact Factor: 3.4 2023 SCImago Journal Rankings: 0.948 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ngan, AHW | en_US |
dc.contributor.author | Zhang, HF | en_US |
dc.date.accessioned | 2012-08-08T08:42:43Z | - |
dc.date.available | 2012-08-08T08:42:43Z | - |
dc.date.issued | 1999 | en_US |
dc.identifier.citation | Mechanics Of Materials, 1999, v. 31 n. 6, p. 367-379 | en_US |
dc.identifier.issn | 0167-6636 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/156506 | - |
dc.description.abstract | The 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.language | eng | en_US |
dc.publisher | Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/mechmat | en_US |
dc.relation.ispartof | Mechanics of Materials | en_US |
dc.title | Mobility of non-planar screw dislocations ahead of a mode III crack tip | en_US |
dc.type | Article | en_US |
dc.identifier.email | Ngan, AHW:hwngan@hkucc.hku.hk | en_US |
dc.identifier.authority | Ngan, AHW=rp00225 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1016/S0167-6636(99)00006-X | en_US |
dc.identifier.scopus | eid_2-s2.0-0032679333 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-0032679333&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 31 | en_US |
dc.identifier.issue | 6 | en_US |
dc.identifier.spage | 367 | en_US |
dc.identifier.epage | 379 | en_US |
dc.identifier.isi | WOS:000081017400001 | - |
dc.publisher.place | Netherlands | en_US |
dc.identifier.scopusauthorid | Ngan, AHW=7006827202 | en_US |
dc.identifier.scopusauthorid | Zhang, HF=7409198080 | en_US |
dc.identifier.issnl | 0167-6636 | - |