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Volumes sampled for hardness and for modulus of elasticity during nanoindentation testing

Published online by Cambridge University Press:  07 June 2012

Mahdi Saket Kashani ,
Akbar Aftabi Gilvan  and
Vis Madhavan
Mahdi Saket Kashani
Affiliation:
Department of Industrial and Manufacturing Engineering, Wichita State University, Wichita, Kansas 67260
Akbar Aftabi Gilvan
Affiliation:
Department of Industrial and Manufacturing Engineering, Wichita State University, Wichita, Kansas 67260
Vis Madhavan*
Affiliation:
Department of Industrial and Manufacturing Engineering, Wichita State University, Wichita, Kansas 67260
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In this article, the sizes of the volumes sampled by nanoindentation tests for hardness and modulus measurements are studied using finite element simulations. The zones of influence for hardness and modulus in single-phase systems are determined by modeling a hemispherical particle in a matrix, with properties close to those of each other, and monitoring the deviation of the measured values from those of the particle. It is found that, for hardness testing of elastic-perfectly plastic materials, the intrinsic hardness of the particle is measured as long as the plastic region is still within the particle, i.e., the contact radius is one half or less of the particle radius. Thus, in a hardness test of a single-phase material, all of the plastically deforming material, and only the plastically deforming material, contributes to the hardness measured. In contrast, the zone influencing the modulus is not restricted to a specific volume near the indenter. The modulus measured from the elastic response at the indentation point is dependent upon the entire specimen. A relationship is developed to describe the observed behavior of the measured modulus, that holds true for both sink-in and pile-up material behavior and for different indenter cone angles.

Keywords

nanoindentationhardnesselastic properties
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 12 , 28 June 2012 , pp. 1553 - 1564
Copyright
Copyright © Materials Research Society 2012

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References

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