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Influence of Nanoindenter Tip Radius on the Estimation of the Elastic Modulus

Published online by Cambridge University Press:  23 March 2011

Karim R. Gadelrab  and
Matteo Chiesa
Karim R. Gadelrab
Affiliation:
Laboratory for Energy and NanoScience (LENS), Masdar Institute, United Arab Emirates (UAE)
Matteo Chiesa
Affiliation:
Laboratory for Energy and NanoScience (LENS), Masdar Institute, United Arab Emirates (UAE)
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Abstract

Nanoindentation results are very sensitive to tip rounding and neglecting the value of the tip radius produces erroneous estimation of the material elastic properties. In this study we investigate the effect of tip radius on the estimation of the Elastic modulus by means of finite element analysis of Berkovich and conical tips with different tip radii. Our numerical results were already supported by an experimental study on fused silica with Berkovich tips with different tip radii. The use of classical Oliver Pharr equation overestimated the Elastic modulus. A new analytical model that modifies the Oliver Pharr equation to consider the value of the tip radius is employed to derive the Elastic modulus from load displacement curves yielding improved results compared to the classical Oliver Pharr equation.

Keywords

nano-indentationelastic propertiessimulation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1297: Symposium P – Deformation Mechanisms, Microstructure Evolution and Mechanical Properties of Nanoscale Materials , 2011 , mrsf10-1297-p03-47
Copyright
Copyright © Materials Research Society 2011

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References

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