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
2011 Impact Factor: 1.434
2011 SCImago Journal Rankings: 0.130
DOIhttp://dx.doi.org/10.1557/JMR.2003.0156
ISI Accession Number IDWOS:000182586600017
ReferencesReferences in Scopus
DC Field
Value
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
2011 Impact Factor: 1.434
2011 SCImago Journal Rankings: 0.130
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
Author Affiliations
  1. The University of Hong Kong