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Evaluating initial unloading stiffness from elastic work-of-indentation measured in a nanoindentation experiment

Published online by Cambridge University Press:  11 March 2013

Kaushal K. Jha ,
Nakin Suksawang ,
Debrupa Lahiri  and
Arvind Agarwal
Kaushal K. Jha
Affiliation:
Department of Civil and Environmental Engineering, Florida International University, Miami, Florida 33174
Nakin Suksawang*
Affiliation:
Department of Civil and Environmental Engineering, Florida International University, Miami, Florida 33174
Debrupa Lahiri
Affiliation:
Nanomechanics and Nanotribology Laboratory, Department of Mechanical and Materials Engineering, Florida International University, Miami, Florida 33174
Arvind Agarwal
Affiliation:
Nanomechanics and Nanotribology Laboratory, Department of Mechanical and Materials Engineering, Florida International University, Miami, Florida 33174
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Differentiation of the energy-based power function used to represent the nanoindentation unloading response at the peak indentation load generally overestimates the contact stiffness. This is mainly because of the larger curvature associated with this function and the proximity between the contact and maximum penetration depths. Using the nanoindentation data from ceramics and metals, we have shown that these two errors can be eliminated if the derivative is multiplied by the geometric and stiffness correction factors, respectively. The stiffness correction factor is found to be a function of the elastic energy constant and is independent of the peak indentation load. The contact stiffness evaluated by the proposed method is in excellent agreement with that obtained from the power law derivative for a wide range of elastoplastic materials and peak indentation loads. The relationship between the elastic recovery ratio and elastic energy constant developed in this study further simplifies the proposed procedure.

Keywords

ceramicmetalnanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 6 , 28 March 2013 , pp. 789 - 797
Copyright
Copyright © Materials Research Society 2013

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References

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