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Absence of one-to-one correspondence between elastoplastic properties and sharp-indentation load–penetration data

Published online by Cambridge University Press:  01 February 2005

J. Alkorta ,
J.M. Martínez-Esnaola  and
J. Gil Sevillano
J. Alkorta
Affiliation:
Department of Materials, Centro de Estudios e Investigaciones Técnicas de Gipuzkoa (CEIT) and TECNUN (University of Navarra), 20018 San Sebastián, Spain
J.M. Martínez-Esnaola
Affiliation:
Department of Materials, Centro de Estudios e Investigaciones Técnicas de Gipuzkoa (CEIT) and TECNUN (University of Navarra), 20018 San Sebastián, Spain
J. Gil Sevillano
Affiliation:
Department of Materials, Centro de Estudios e Investigaciones Técnicas de Gipuzkoa (CEIT) and TECNUN (University of Navarra), 20018 San Sebastián, Spain
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Abstract

The connection between parameters that can be measured by means of instrumented indentation with the real mechanical properties has been a matter of discussion for several years. In fact, even hardness is not a readily measurable magnitude since the real contact area depends on both the elastic and plastic properties of the sample. Recently, Dao et al. [ Acta Mater49, 3899 (2001)] proposed a method based on numerical fittings to calculate by a forward-reverse algorithm the elastoplastic properties of a sample from the load-penetration curve obtained with a sharp indenter. This work will show, in contrast, that it is not possible to measure uniquely these mechanical properties of a sample in that way.

Keywords

Elastic propertiesIndentationMechanical properties
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 2 , February 2005 , pp. 432 - 437
Copyright
Copyright © Materials Research Society 2005

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