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Determination of mechanical properties by nanoindentation independently of indentation depth measurement

Published online by Cambridge University Press:  24 August 2012

Gaylord Guillonneau ,
Guillaume Kermouche ,
Sandrine Bec  and
Jean-Luc Loubet
Gaylord Guillonneau*
Affiliation:
Ecole Centrale de Lyon, Université de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, UMR 5513 CNRS/ECL/ENISE, 69134 Ecully, France
Guillaume Kermouche
Affiliation:
Ecole Nationale d’Ingénieurs de Saint-Etienne, Université de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, UMR 5513 CNRS/ECL/ENISE, 42000 Saint-Etienne, France
Sandrine Bec
Affiliation:
Ecole Centrale de Lyon, Université de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, UMR 5513 CNRS/ECL/ENISE, 69134 Ecully, France
Jean-Luc Loubet
Affiliation:
Ecole Centrale de Lyon, Université de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, UMR 5513 CNRS/ECL/ENISE, 69134 Ecully, France
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A new technique based on the detection of the amplitude of the second harmonic was described in a previous paper. To compute the elastic modulus and the hardness of materials, the technique uses only the derivative of the contact radius with respect to the indentation depth. For this reason, this method is applicable only to homogeneous materials. In this paper, the method is extended to any materials with constant Young modulus. The indentation depth value is not needed at all, thus eliminating uncertainties related to the displacement measurement, which are very influent at small penetration depths. Furthermore, we also explain how to compute the indentation depth from the detection of the amplitude of the second harmonic. This new measurement technique was tested on three samples: fused silica, Poly(methyl methacrylate) (PMMA), and calcite, which is expected to exhibit indentation size effect. The obtained results show that mechanical properties and the indentation depth can be determined with good accuracy for penetration depths between 25 and 100 nm using this method.

Keywords

nano-indentationhardnesselastic modulussecond harmonicdynamic measurementindentation depthcalcite
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 19 , 14 October 2012 , pp. 2551 - 2560
Copyright
Copyright © Materials Research Society 2012

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