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Article: Accurate measurement of tip-sample contact size during nanoindentation of viscoelastic materials
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TitleAccurate measurement of tip-sample contact size during nanoindentation of viscoelastic materials
 
AuthorsTang, B1
Ngan, AHW1
 
KeywordsEngineering
Engineering mechanics and materials physics
 
Issue Date2003
 
PublisherMaterials Research Society. The Journal's web site is located at http://www.mrs.org/publications/jmr
 
CitationJournal of Materials Research, 2003, v. 18 n. 5, p. 1141-1148 [How to Cite?]
DOI: http://dx.doi.org/10.1557/JMR.2003.0156
 
AbstractPolypropylene (PP) and amorphous selenium (a-Se) were used as prototype materials at room temperature to explore the problems that may exist in the accurate measurement of the reduced modulus of viscoelastic materials using depth-sensing nanoindentation. As has been reported previously by others, we observed that a "nose" in the load - displacement curve may occur during unloading, indicating significant creep effects at the onset of unloading. To accurately measure the elastic modulus in viscoelastic materials like PP or a-Se, both the contact stiffness and the contact area at the onset of unloading must be determined accurately. The issue of removing the influence of creep on the measurement of the contact stiffness using the Oliver - Pharr method has been addressed in a previous paper by Feng and Ngan. In this work, the effect of creep on contact-depth measurement is considered. Removal of creep effects in both contact stiffness and contact-area measurement leads to satisfactory prediction of the reduced moduli in PP and a-Se.
 
ISSN0884-2914
2012 Impact Factor: 1.713
2012 SCImago Journal Rankings: 0.837
 
DOIhttp://dx.doi.org/10.1557/JMR.2003.0156
 
ISI Accession Number IDWOS:000182586600017
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorTang, B
 
dc.contributor.authorNgan, AHW
 
dc.date.accessioned2012-08-08T08:43:28Z
 
dc.date.available2012-08-08T08:43:28Z
 
dc.date.issued2003
 
dc.description.abstractPolypropylene (PP) and amorphous selenium (a-Se) were used as prototype materials at room temperature to explore the problems that may exist in the accurate measurement of the reduced modulus of viscoelastic materials using depth-sensing nanoindentation. As has been reported previously by others, we observed that a "nose" in the load - displacement curve may occur during unloading, indicating significant creep effects at the onset of unloading. To accurately measure the elastic modulus in viscoelastic materials like PP or a-Se, both the contact stiffness and the contact area at the onset of unloading must be determined accurately. The issue of removing the influence of creep on the measurement of the contact stiffness using the Oliver - Pharr method has been addressed in a previous paper by Feng and Ngan. In this work, the effect of creep on contact-depth measurement is considered. Removal of creep effects in both contact stiffness and contact-area measurement leads to satisfactory prediction of the reduced moduli in PP and a-Se.
 
dc.description.naturepublished_or_final_version
 
dc.identifier.citationJournal of Materials Research, 2003, v. 18 n. 5, p. 1141-1148 [How to Cite?]
DOI: http://dx.doi.org/10.1557/JMR.2003.0156
 
dc.identifier.doihttp://dx.doi.org/10.1557/JMR.2003.0156
 
dc.identifier.epage1148
 
dc.identifier.hkuros76780
 
dc.identifier.isiWOS:000182586600017
 
dc.identifier.issn0884-2914
2012 Impact Factor: 1.713
2012 SCImago Journal Rankings: 0.837
 
dc.identifier.issue5
 
dc.identifier.openurl
 
dc.identifier.scopuseid_2-s2.0-0038676473
 
dc.identifier.spage1141
 
dc.identifier.urihttp://hdl.handle.net/10722/156673
 
dc.identifier.volume18
 
dc.languageeng
 
dc.publisherMaterials Research Society. The Journal's web site is located at http://www.mrs.org/publications/jmr
 
dc.publisher.placeUnited States
 
dc.relation.ispartofJournal of Materials Research
 
dc.relation.referencesReferences in Scopus
 
dc.rightsJournal of Materials Research. Copyright © Materials Research Society.
 
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License
 
dc.subjectEngineering
 
dc.subjectEngineering mechanics and materials physics
 
dc.titleAccurate measurement of tip-sample contact size during nanoindentation of viscoelastic materials
 
dc.typeArticle
 
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Author Affiliations
  1. The University of Hong Kong