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On the elastic effects in power-law indentation creep with sharp conical indenters

Published online by Cambridge University Press:  31 January 2011

Jon Alkorta ,
José Manuel Martínez-Esnaola  and
Javier Gil Sevillano
Jon Alkorta*
Affiliation:
Centro de Estudios e Investigaciones Técnicas de Gipuzkoa (CEIT) and Technological Campus of the University of Navarra (TECNUN), 20018 San Sebastián, Spain
José Manuel Martínez-Esnaola
Affiliation:
Centro de Estudios e Investigaciones Técnicas de Gipuzkoa (CEIT) and Technological Campus of the University of Navarra (TECNUN), 20018 San Sebastián, Spain
Javier Gil Sevillano
Affiliation:
Centro de Estudios e Investigaciones Técnicas de Gipuzkoa (CEIT) and Technological Campus of the University of Navarra (TECNUN), 20018 San Sebastián, Spain
*
a)Address all correspondence to this author. e-mail: jalkorta@ceit.es
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Abstract

The elastic deformation contribution can significantly affect the measurement of the strain-rate sensitivity (SRS) of the plastic flow stress by indentation methods. In this paper, the effect of such elastic contribution is critically analyzed using an extension of a previous treatment developed by the authors for the elastic effects on the indentation of strain-hardening materials [J. Alkorta et al., J. Mater. Res.20, 432 (2005)]. The analytical model is calibrated and validated through finite element calculations. The results show that when the elastic contribution to the total deformation is not negligible then the measured SRS is significantly lower than the real one. A satisfactory correction factor for the apparent SRS exponent is proposed based on parameters directly accessible to instrumented indentation test results.

Keywords

HardnessElastic propertiesSimulation
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 1 , January 2008 , pp. 182 - 188
Copyright
Copyright © Materials Research Society 2008

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References

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