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Comments on “Comment on the determination of mechanical properties from the energy dissipated during indentation” by J. Malzbender [J. Mater. Res. 20, 1090 (2005)]

Published online by Cambridge University Press:  01 January 2006

J. Alkorta ,
J.M. Martínez–Esnaola ,
J. Gil Sevillano  and
Jürgen Malzbender
J. Alkorta*
Affiliation:
Centro de Estudios e Investigaciones Técnicas de Gipuzkoa (CEIT) and TECNUN (Campus Tecnológico, Universidad de Navarra, University of Navarra, 20018 San Sebastián, Spain
J.M. Martínez–Esnaola
Affiliation:
Centro de Estudios e Investigaciones Técnicas de Gipuzkoa (CEIT) and TECNUN (Campus Tecnológico, Universidad de Navarra, University of Navarra, 20018 San Sebastián, Spain
J. Gil Sevillano
Affiliation:
Centro de Estudios e Investigaciones Técnicas de Gipuzkoa (CEIT) and TECNUN (Campus Tecnológico, Universidad de Navarra, University of Navarra, 20018 San Sebastián, Spain
Jürgen Malzbender
Affiliation:
Forschungszentrum Jülich GmbH Institute for Materials and Processes in Energy Systems, 52425 Jülich, Germany
*
a)Address all correspondence to this author. e-mail: jalkorta@ceit.es
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Abstract

Based on a comparison of relationships between energy dissipated during indentation and the ratio of hardness to reduced elastic modulus, Malzbender has recently proposed a procedure to determine both hardness and elastic modulus from a single loading–unloading indentation curve. However, a more accurate analysis of this relationship shows that, in fact, it suffers from the same limitations as the well-known Oliver and Pharr's method; i.e., in general, the true projected imprint area has to be measured in addition to the load–penetration curve or at least two such curves obtained with different indenter geometries are to be used to unequivocally determine the hardness and the elastic modulus of a material.

Keywords

IndentationMechanical propertiesNanoindentation

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Journal of Materials Research , Volume 21 , Issue 1 , January 2006 , pp. 302 - 305
Copyright
Copyright © Materials Research Society 2006

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References

REFERENCES

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