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Article: Understanding acoustoplasticity through dislocation dynamics simulations

TitleUnderstanding acoustoplasticity through dislocation dynamics simulations
Authors
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
Citation
Philosophical Magazine, 2011, v. 91 n. 34, p. 4367-4387 How to Cite?
Abstract
The 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.
Persistent Identifierhttp://hdl.handle.net/10722/146876
ISSN
2013 Impact Factor: 1.427
2013 SCImago Journal Rankings: 1.014
ISI Accession Number ID
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.

References

 

DC FieldValueLanguage
dc.contributor.authorSiu, KWen_HK
dc.contributor.authorNgan, AHWen_HK
dc.date.accessioned2012-05-23T05:43:39Z-
dc.date.available2012-05-23T05:43:39Z-
dc.date.issued2011en_HK
dc.identifier.citationPhilosophical Magazine, 2011, v. 91 n. 34, p. 4367-4387en_HK
dc.identifier.issn1478-6435en_HK
dc.identifier.urihttp://hdl.handle.net/10722/146876-
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.en_HK
dc.languageengen_US
dc.publisherTaylor & Francis Ltd. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/14786435.aspen_HK
dc.relation.ispartofPhilosophical Magazineen_HK
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/10.1080/14786435.2011.606237en_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectAcoustoplasticityen_HK
dc.subjectDislocation annihilationen_HK
dc.subjectDislocation dynamics simulationen_HK
dc.subjectUltrasonic softeningen_HK
dc.titleUnderstanding acoustoplasticity through dislocation dynamics simulationsen_HK
dc.typeArticleen_HK
dc.identifier.emailNgan, AHW:hwngan@hkucc.hku.hken_HK
dc.identifier.authorityNgan, AHW=rp00225en_HK
dc.description.naturepostprint-
dc.identifier.doi10.1080/14786435.2011.606237en_HK
dc.identifier.scopuseid_2-s2.0-84855710575en_HK
dc.identifier.hkuros199636en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84855710575&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume91en_HK
dc.identifier.issue34en_HK
dc.identifier.spage4367en_HK
dc.identifier.epage4387en_HK
dc.identifier.isiWOS:000298585300007-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridSiu, KW=37110193600en_HK
dc.identifier.scopusauthoridNgan, AHW=7006827202en_HK

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