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Article: Accurate measurement of tip-sample contact size during nanoindentation of viscoelastic materials

TitleAccurate measurement of tip-sample contact size during nanoindentation of viscoelastic materials
Authors
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
Citation
Journal of Materials Research, 2003, v. 18 n. 5, p. 1141-1148 How to Cite?
Abstract
Polypropylene (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.
Persistent Identifierhttp://hdl.handle.net/10722/156673
ISSN
2013 Impact Factor: 1.815
2013 SCImago Journal Rankings: 0.888
ISI Accession Number ID
References

 

Author Affiliations
  1. The University of Hong Kong
DC FieldValueLanguage
dc.contributor.authorTang, Ben_HK
dc.contributor.authorNgan, AHWen_HK
dc.date.accessioned2012-08-08T08:43:28Z-
dc.date.available2012-08-08T08:43:28Z-
dc.date.issued2003en_HK
dc.identifier.citationJournal of Materials Research, 2003, v. 18 n. 5, p. 1141-1148en_HK
dc.identifier.issn0884-2914en_HK
dc.identifier.urihttp://hdl.handle.net/10722/156673-
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.en_HK
dc.languageengen_US
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.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 materialsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0884-2914&volume=18&issue=5&spage=1141&epage=1148&date=2003&atitle=Accurate+measurement+of+tip-sample+contact+size+during+nanoindentation+of+viscoelastic+materials-
dc.identifier.emailTang, B: tangbin@hkucc.hku.hken_HK
dc.identifier.emailNgan, AHW: hwngan@hkucc.hku.hken_HK
dc.identifier.authorityTang, B=rp00081en_HK
dc.identifier.authorityNgan, AHW=rp00225en_HK
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1557/JMR.2003.0156-
dc.identifier.scopuseid_2-s2.0-0038676473en_HK
dc.identifier.hkuros76780-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0038676473&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume18en_HK
dc.identifier.issue5en_HK
dc.identifier.spage1141en_HK
dc.identifier.epage1148en_HK
dc.identifier.isiWOS:000182586600017-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridTang, B=24554184100en_HK
dc.identifier.scopusauthoridNgan, AHW=7006827202en_HK

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