Experimental determination of the effective indenter shape and epsilon-factor for nanoindentation by continuously measuring the unloading stiffness

Merle B, Maier V, Göken M, Durst K (2012)


Publication Status: Published

Publication Type: Journal article

Publication year: 2012

Journal

Publisher: CAMBRIDGE UNIV PRESS

Book Volume: 27

Pages Range: 214-221

Journal Issue: 1

URI: https://opus4.kobv.de/opus4-fau/files/2988/merle_experimental_4245.pdf

DOI: 10.1557/jmr.2011.245

Abstract

The Oliver and Pharr method for evaluating nanoindentation load-displacement data is based on the measurement of the contact stiffness, which is usually determined at the very beginning of the unloading sequence, or, using dynamic nanoindentation, continuously during the whole loading segment. A new experimental method has been developed to continuously monitor the contact stiffness throughout the unloading sequence. It provides supplementary information about the shape and area of the residual impression, as well as a direct measurement of the shape of the effective indenter previously introduced by Pharr and Bolshakov. The new method was applied to indentations on fused silica, sapphire, nanocrystalline nickel, and ultrafin e-grained aluminum. Lastly, the new procedure was adapted to directly measure the epsilon factor used in the Oliver and Pharr method. A value of 0.76 was found from indentation into fused silica, in close agreement with literature values.

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APA:

Merle, B., Maier, V., Göken, M., & Durst, K. (2012). Experimental determination of the effective indenter shape and epsilon-factor for nanoindentation by continuously measuring the unloading stiffness. Journal of Materials Research, 27(1), 214-221. https://dx.doi.org/10.1557/jmr.2011.245

MLA:

Merle, Benoit, et al. "Experimental determination of the effective indenter shape and epsilon-factor for nanoindentation by continuously measuring the unloading stiffness." Journal of Materials Research 27.1 (2012): 214-221.

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