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Article: Understanding acoustoplasticity through dislocation dynamics simulations
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TitleUnderstanding acoustoplasticity through dislocation dynamics simulations
 
AuthorsSiu, KW1
Ngan, AHW1
 
KeywordsAcoustoplasticity
Dislocation annihilation
Dislocation dynamics simulation
Ultrasonic softening
 
Issue Date2011
 
PublisherTaylor & Francis Ltd. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/14786435.asp
 
CitationPhilosophical Magazine, 2011, v. 91 n. 34, p. 4367-4387 [How to Cite?]
DOI: http://dx.doi.org/10.1080/14786435.2011.606237
 
AbstractThe acoustoplastic effect in metals is routinely utilised in industrial processes involving forming, machining and joining, but the underlying mechanism is still not well understood. There have been earlier suggestions that dislocation mobility is enhanced intrinsically by the applied ultrasound excitation, but in subsequent deliberations it is routinely assumed that the ultrasound merely adds extra stresses to the material without altering its dislocation density or intrinsic resistance to deformation. In this study, a dislocation dynamics simulation was carried out to investigate the interactions of dislocations under the combined influence of quasi-static and oscillatory stresses. Under such combined stress states, dislocation annihilation is found to be enhanced leading to larger strains at the same load history. The simulated strain evolution under different stress schemes also closely resembles certain previously obtained experimental observations. The discovery here goes far beyond the simple picture that the ultrasound effect is merely an added-stress one, since here, the intrinsic strain-hardening potency of the material is found to be reduced by the ultrasound, through its effect on enhancing dislocation annihilation. © 2011 Taylor & Francis.
 
ISSN1478-6435
2013 Impact Factor: 1.427
2013 SCImago Journal Rankings: 1.014
 
DOIhttp://dx.doi.org/10.1080/14786435.2011.606237
 
ISI Accession Number IDWOS:000298585300007
Funding AgencyGrant Number
Research Grants Council of the Hong Kong Special Administration Region, P.R. ChinaHKU7159/10E
University Grants Committee, Hong Kong Special AdministrationSEG-HKU06
Funding Information:

The work described in this paper was supported by grants from the Research Grants Council of the Hong Kong Special Administration Region, P.R. China (Project No. HKU7159/10E), as well as from the University Grants Committee (Project No. SEG-HKU06) of the Hong Kong Special Administration.

 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorSiu, KW
 
dc.contributor.authorNgan, AHW
 
dc.date.accessioned2012-05-23T05:43:39Z
 
dc.date.available2012-05-23T05:43:39Z
 
dc.date.issued2011
 
dc.description.abstractThe acoustoplastic effect in metals is routinely utilised in industrial processes involving forming, machining and joining, but the underlying mechanism is still not well understood. There have been earlier suggestions that dislocation mobility is enhanced intrinsically by the applied ultrasound excitation, but in subsequent deliberations it is routinely assumed that the ultrasound merely adds extra stresses to the material without altering its dislocation density or intrinsic resistance to deformation. In this study, a dislocation dynamics simulation was carried out to investigate the interactions of dislocations under the combined influence of quasi-static and oscillatory stresses. Under such combined stress states, dislocation annihilation is found to be enhanced leading to larger strains at the same load history. The simulated strain evolution under different stress schemes also closely resembles certain previously obtained experimental observations. The discovery here goes far beyond the simple picture that the ultrasound effect is merely an added-stress one, since here, the intrinsic strain-hardening potency of the material is found to be reduced by the ultrasound, through its effect on enhancing dislocation annihilation. © 2011 Taylor & Francis.
 
dc.description.naturepostprint
 
dc.identifier.citationPhilosophical Magazine, 2011, v. 91 n. 34, p. 4367-4387 [How to Cite?]
DOI: http://dx.doi.org/10.1080/14786435.2011.606237
 
dc.identifier.doihttp://dx.doi.org/10.1080/14786435.2011.606237
 
dc.identifier.epage4387
 
dc.identifier.hkuros199636
 
dc.identifier.isiWOS:000298585300007
Funding AgencyGrant Number
Research Grants Council of the Hong Kong Special Administration Region, P.R. ChinaHKU7159/10E
University Grants Committee, Hong Kong Special AdministrationSEG-HKU06
Funding Information:

The work described in this paper was supported by grants from the Research Grants Council of the Hong Kong Special Administration Region, P.R. China (Project No. HKU7159/10E), as well as from the University Grants Committee (Project No. SEG-HKU06) of the Hong Kong Special Administration.

 
dc.identifier.issn1478-6435
2013 Impact Factor: 1.427
2013 SCImago Journal Rankings: 1.014
 
dc.identifier.issue34
 
dc.identifier.scopuseid_2-s2.0-84855710575
 
dc.identifier.spage4367
 
dc.identifier.urihttp://hdl.handle.net/10722/146876
 
dc.identifier.volume91
 
dc.languageeng
 
dc.publisherTaylor & Francis Ltd. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/14786435.asp
 
dc.publisher.placeUnited Kingdom
 
dc.relation.ispartofPhilosophical Magazine
 
dc.relation.referencesReferences in Scopus
 
dc.rightsThis is an electronic version of an article published in Philosophical Magazine, 2011, v. 91 n. 34, p. 4367-4387. The article is available online at: http://www.tandfonline.com/doi/abs/10.1080/14786435.2011.606237
 
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License
 
dc.subjectAcoustoplasticity
 
dc.subjectDislocation annihilation
 
dc.subjectDislocation dynamics simulation
 
dc.subjectUltrasonic softening
 
dc.titleUnderstanding acoustoplasticity through dislocation dynamics simulations
 
dc.typeArticle
 
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Author Affiliations
  1. The University of Hong Kong