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Article: Viscoelastic effects during unloading in depth-sensing indentation

TitleViscoelastic effects during unloading in depth-sensing indentation
Authors
KeywordsEngineering
Engineering mechanics and materials physics
Issue Date2002
PublisherMaterials Research Society. The Journal's web site is located at http://www.mrs.org/publications/jmr
Citation
Journal Of Materials Research, 2002, v. 17 n. 10, p. 2604-2610 How to Cite?
AbstractWith polypropylene as a prototype viscoelastic material at room temperature, it was found that a "nose" may appear in the unloading segment of the load-displacement curve during nanoindentation when the holding time at peak load is short and/or the unloading rate is small, and when the peak load is high enough. The load at which the nose appears was also found to decrease linearly with decreasing unloading rate. A linear viscoelasticity analysis was performed to interpret this effect. The analysis predicts a linear variation between the nose load and the unloading rate, and the slope of such a linear variation is also shown to be proportional to the viscosity parameter of the material. Thus, by measuring the slope of the nose-load versus unloading rate plot at a given temperature, the viscosity parameter of the specimen can be found. This is a new way of measuring the viscosity parameter of a material in addition to the existing method of force modulation and noting the frequency response of the displacement.
Persistent Identifierhttp://hdl.handle.net/10722/43046
ISSN
2015 Impact Factor: 1.579
2015 SCImago Journal Rankings: 0.664
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorNgan, AHWen_HK
dc.contributor.authorTang, Ben_HK
dc.date.accessioned2007-03-23T04:37:34Z-
dc.date.available2007-03-23T04:37:34Z-
dc.date.issued2002en_HK
dc.identifier.citationJournal Of Materials Research, 2002, v. 17 n. 10, p. 2604-2610en_HK
dc.identifier.issn0884-2914en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43046-
dc.description.abstractWith polypropylene as a prototype viscoelastic material at room temperature, it was found that a "nose" may appear in the unloading segment of the load-displacement curve during nanoindentation when the holding time at peak load is short and/or the unloading rate is small, and when the peak load is high enough. The load at which the nose appears was also found to decrease linearly with decreasing unloading rate. A linear viscoelasticity analysis was performed to interpret this effect. The analysis predicts a linear variation between the nose load and the unloading rate, and the slope of such a linear variation is also shown to be proportional to the viscosity parameter of the material. Thus, by measuring the slope of the nose-load versus unloading rate plot at a given temperature, the viscosity parameter of the specimen can be found. This is a new way of measuring the viscosity parameter of a material in addition to the existing method of force modulation and noting the frequency response of the displacement.en_HK
dc.format.extent142066 bytes-
dc.format.extent40924 bytes-
dc.format.extent310 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherMaterials Research Society. The Journal's web site is located at http://www.mrs.org/publications/jmren_HK
dc.relation.ispartofJournal of Materials Researchen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsJournal of Materials Research. Copyright © Materials Research Society.en_HK
dc.subjectEngineeringen_HK
dc.subjectEngineering mechanics and materials physicsen_HK
dc.titleViscoelastic effects during unloading in depth-sensing indentationen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0884-2914&volume=17&issue=10&spage=2604&epage=2610&date=2002&atitle=Viscoelastic+effects+during+unloading+in+depth-sensing+indentationen_HK
dc.identifier.emailNgan, AHW: hwngan@hkucc.hku.hken_HK
dc.identifier.emailTang, B: tangbin@hkucc.hku.hken_HK
dc.identifier.authorityNgan, AHW=rp00225en_HK
dc.identifier.authorityTang, B=rp00081en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1557/JMR.2002.0377en_HK
dc.identifier.scopuseid_2-s2.0-0036804159en_HK
dc.identifier.hkuros76776-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036804159&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume17en_HK
dc.identifier.issue10en_HK
dc.identifier.spage2604en_HK
dc.identifier.epage2610en_HK
dc.identifier.isiWOS:000178351400018-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridNgan, AHW=7006827202en_HK
dc.identifier.scopusauthoridTang, B=24554184100en_HK

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