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Article: A Monte Carlo model for the intermittent plasticity of micro-pillars

TitleA Monte Carlo model for the intermittent plasticity of micro-pillars
Authors
Issue Date2008
PublisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/journals/msmse
Citation
Modelling And Simulation In Materials Science And Engineering, 2008, v. 16 n. 5 How to Cite?
AbstractEarlier compression experiments on micrometre-sized aluminium pillars, fabricated by focused-ion beam milling, using a flat-punch nanoindenter revealed that post-yield deformation during constant-rate loading was jerky with interspersing strain bursts and linear elastic segments. Under load hold, the pillars crept mainly by means of sporadic strain bursts. In this work, a Monte Carlo simulation model is developed, with two statistics gathered from the load-ramp experiments as input, to account for the jerky deformation during the load ramp as well as load hold. Under load-ramp conditions, the simulations successfully captured other experimental observations made independently from the two inputs, namely, the diverging behaviour of the jerky stress-strain response at higher stresses, the increase in burst frequency and burst size with stress and the overall power-law distribution of the burst size. The model also predicts creep behaviour agreeable with the experimental observations, namely, the occurrence of sporadic bursts with frequency depending on stress, creep time and pillar dimensions. © 2008 IOP Publishing Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/76208
ISSN
2015 Impact Factor: 1.859
2015 SCImago Journal Rankings: 1.091
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorNg, KSen_HK
dc.contributor.authorNgan, AHWen_HK
dc.date.accessioned2010-09-06T07:18:41Z-
dc.date.available2010-09-06T07:18:41Z-
dc.date.issued2008en_HK
dc.identifier.citationModelling And Simulation In Materials Science And Engineering, 2008, v. 16 n. 5en_HK
dc.identifier.issn0965-0393en_HK
dc.identifier.urihttp://hdl.handle.net/10722/76208-
dc.description.abstractEarlier compression experiments on micrometre-sized aluminium pillars, fabricated by focused-ion beam milling, using a flat-punch nanoindenter revealed that post-yield deformation during constant-rate loading was jerky with interspersing strain bursts and linear elastic segments. Under load hold, the pillars crept mainly by means of sporadic strain bursts. In this work, a Monte Carlo simulation model is developed, with two statistics gathered from the load-ramp experiments as input, to account for the jerky deformation during the load ramp as well as load hold. Under load-ramp conditions, the simulations successfully captured other experimental observations made independently from the two inputs, namely, the diverging behaviour of the jerky stress-strain response at higher stresses, the increase in burst frequency and burst size with stress and the overall power-law distribution of the burst size. The model also predicts creep behaviour agreeable with the experimental observations, namely, the occurrence of sporadic bursts with frequency depending on stress, creep time and pillar dimensions. © 2008 IOP Publishing Ltd.en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/journals/msmseen_HK
dc.relation.ispartofModelling and Simulation in Materials Science and Engineeringen_HK
dc.titleA Monte Carlo model for the intermittent plasticity of micro-pillarsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0965-0393&volume=16&spage=055004&epage=1 to 055004&date=2008&atitle=A+monte+carlo+model+for+the+intermittent+plasticity+of+micro-pillarsen_HK
dc.identifier.emailNgan, AHW:hwngan@hkucc.hku.hken_HK
dc.identifier.authorityNgan, AHW=rp00225en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/0965-0393/16/5/055004en_HK
dc.identifier.scopuseid_2-s2.0-48249122349en_HK
dc.identifier.hkuros144225en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-48249122349&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume16en_HK
dc.identifier.issue5en_HK
dc.identifier.isiWOS:000257338300004-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridNg, KS=23005417800en_HK
dc.identifier.scopusauthoridNgan, AHW=7006827202en_HK

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