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  Influence of the indenter tip geometry and environment on the indentation modulus of enamel

Guidoni, G. M., He, L., Schöberl, T., Jäger, I., Dehm, G., & Swain, M. V. (2009). Influence of the indenter tip geometry and environment on the indentation modulus of enamel. Journal of Materials Research, 24(3), 616-625. doi:10.1557/JMR.2009.0110.

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 Creators:
Guidoni, Griselda M.1, 2, Author              
He, Lihong3, Author              
Schöberl, Thomas4, Author              
Jäger, Ingomar5, Author              
Dehm, Gerhard1, 2, Author              
Swain, Michael V.3, 6, Author              
Affiliations:
1Erich Schmid Institute of Material Science, Austrian Academy of Sciences, Leoben A-8700, Austria, ou_persistent22              
2Department of Materials Physics, Montanuniversität Leoben, Austria, ou_persistent22              
3Biomaterials Science Research Unit, Faculty of Dentistry, University of Sydney, Surry Hills, Sydney, NSW 2010, Australia, ou_persistent22              
4Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, A-8700 Leoben, Austria, ou_persistent22              
5Department of Material Physics, University of Leoben, Leoben A-8700, Austria, ou_persistent22              
6Biomaterials Unit, Department of Oral Sciences, University of Otago, Dunedin, New Zealand, ou_persistent22              

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 Abstract: The aim of the investigation was to study the influence of indenter tip geometry on the conventionally obtained indentation modulus of enamel by nanoindentation. Indentation tests on bovine enamel using three different diamond pyramidal indenters with half face angles 65.27°, 45°, and 35.26° were conducted to evaluate the indentation modulus using the Oliver–Pharr method [W.C. Oliver and G.M. Pharr, J. Mater. Res. 7, 1564 (1992)]. In addition, three different dehydration conditions were studied: wet under Hank’s balanced salt solution, laboratory dried, and vacuum dehydrated. For the Berkovich indenter (65.27°) and 45° pyramidal indenters, there was only a small difference between indentation modulus values, whereas for the cube-corner indenter (35.26°) a ratio of 2.4 between laboratory dry and wet samples was found. A detailed evaluation, including indentation creep and recovery as well as pileup, resulted in a reduction of this latter ratio to 1.7. This still large difference was rationalized on the basis of the different deformation mechanisms generated by indenters of different face angles.

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Language(s): eng - English
 Dates: 2009-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1557/JMR.2009.0110
 Degree: -

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Title: Journal of Materials Research
  Abbreviation : J. Mater. Res.
Source Genre: Journal
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Publ. Info: Pittsburgh, PA : Published for the Materials Research Society by the American Institute of Physics
Pages: - Volume / Issue: 24 (3) Sequence Number: - Start / End Page: 616 - 625 Identifier: ISSN: 0884-2914
CoNE: https://pure.mpg.de/cone/journals/resource/954925550339