Article: Understanding acoustoplasticity through dislocation dynamics simulations
| Title | Understanding acoustoplasticity through dislocation dynamics simulations | ||||||
|---|---|---|---|---|---|---|---|
| Authors | Siu, KW1 Ngan, AHW1 | ||||||
| Keywords | Acoustoplasticity Dislocation annihilation Dislocation dynamics simulation Ultrasonic softening | ||||||
| Issue Date | 2011 | ||||||
| Publisher | Taylor & 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?] DOI: http://dx.doi.org/10.1080/14786435.2011.606237 | ||||||
| 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. | ||||||
| ISSN | 1478-6435 2011 Impact Factor: 1.51 2011 SCImago Journal Rankings: 0.093 | ||||||
| DOI | http://dx.doi.org/10.1080/14786435.2011.606237 | ||||||
| ISI Accession Number ID | WOS:000298585300007
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 | References in Scopus |
| dc.contributor.author | Siu, KW | ||||||
|---|---|---|---|---|---|---|---|
| dc.contributor.author | Ngan, AHW | ||||||
| dc.date.accessioned | 2012-05-23T05:43:39Z | ||||||
| dc.date.available | 2012-05-23T05:43:39Z | ||||||
| dc.date.issued | 2011 | ||||||
| dc.description.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. | ||||||
| dc.description.nature | postprint | ||||||
| dc.identifier.citation | Philosophical Magazine, 2011, v. 91 n. 34, p. 4367-4387 [How to Cite?] DOI: http://dx.doi.org/10.1080/14786435.2011.606237 | ||||||
| dc.identifier.doi | http://dx.doi.org/10.1080/14786435.2011.606237 | ||||||
| dc.identifier.epage | 4387 | ||||||
| dc.identifier.hkuros | 199636 | ||||||
| dc.identifier.isi | WOS:000298585300007
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.issn | 1478-6435 2011 Impact Factor: 1.51 2011 SCImago Journal Rankings: 0.093 | ||||||
| dc.identifier.issue | 34 | ||||||
| dc.identifier.scopus | eid_2-s2.0-84855710575 | ||||||
| dc.identifier.spage | 4367 | ||||||
| dc.identifier.uri | http://hdl.handle.net/10722/146876 | ||||||
| dc.identifier.volume | 91 | ||||||
| dc.language | eng | ||||||
| dc.publisher | Taylor & Francis Ltd. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/14786435.asp | ||||||
| dc.publisher.place | United Kingdom | ||||||
| dc.relation.ispartof | Philosophical Magazine | ||||||
| dc.relation.references | References in Scopus | ||||||
| dc.rights | This 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.rights | Creative Commons: Attribution 3.0 Hong Kong License | ||||||
| dc.subject | Acoustoplasticity | ||||||
| dc.subject | Dislocation annihilation | ||||||
| dc.subject | Dislocation dynamics simulation | ||||||
| dc.subject | Ultrasonic softening | ||||||
| dc.title | Understanding acoustoplasticity through dislocation dynamics simulations | ||||||
| dc.type | Article |
Author Affiliations
- The University of Hong Kong