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Comment to paper “Penetration depth and tip radius dependence on the correction factor in nanoindentation measurements” by J.M. Meza et al. [J. Mater. Res. 23(3), 725 (2008)]

Published online by Cambridge University Press:  20 March 2012

Karsten Durst ,
Hamad ur Rehman  and
Benoit Merle
Karsten Durst*
Affiliation:
Department of Materials Science and Engineering, University of Erlangen-Nürnberg, 91058 Erlangen, Germany
Hamad ur Rehman
Affiliation:
Department of Materials Science and Engineering, University of Erlangen-Nürnberg, 91058 Erlangen, Germany
Benoit Merle
Affiliation:
Department of Materials Science and Engineering, University of Erlangen-Nürnberg, 91058 Erlangen, Germany
*
a)Address all correspondence to this author. e-mail: karsten.durst@ww.uni-erlangen.de
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Abstract

[Meza et al. J. Mater. Res.23(3), 725 (2008)] recently claimed that the correction factor beta for the Sneddon equation, used for the evaluation of nanoindentation load-displacement data, is strongly depth- and tip-shape-dependent. Meza et al. used finite element (FE) analysis to simulate the contact between conical or spheroconical indenters, and an elastic material. They calculated the beta factor by comparing the simulated contact stiffness with Sneddon’s prediction for conical indenters. Their analysis is misleading, and it is shown here that by applying the general Sneddon equation, taking into account the true contact area, an almost constant and depth-independent beta factor is obtained for conical, spherical and spheroconical indenter geometries.

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Journal of Materials Research , Volume 27 , Issue 8 , 28 April 2012 , pp. 1205 - 1207
Copyright
Copyright © Materials Research Society 2012

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References

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