Influence of modulus-to-hardness ratio and harmonic parameters on continuous stiffness measurement during nanoindentation

Merle B, Maier-Kiener V, Pharr GM (2017)

Publication Status: Published

Publication Type: Journal article

Publication year: 2017

Journal

Acta Materialia Elsevier

Publisher: PERGAMON-ELSEVIER SCIENCE LTD

Book Volume: 134

Pages Range: 167-176

DOI: 10.1016/j.actamat.2017.05.036

Abstract

Dynamic nanoindentation is a popular method for continuously probing the mechanical properties of a sample as a function of depth. It is shown here that special caution should be exercised when testing materials with high modulus-to-hardness ratios (E/H) at fast loading rates, as the choice of harmonic parameters can result in a significant underestimation of the contact stiffness and hence the elastic modulus. The origin of this behavior is traced back to a bias occurring during signal processing by the lock-in amplifier. The possible consequences of flawed measurements are highlighted and a practical method for detecting possible occurrence from the phase angle signal is presented. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Authors with CRIS profile

Benoit Merle Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM) Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

In-situ nanomechanics and FIB tomography of thin films (EXC315 EAM (A2-3)) Exzellenz-Cluster Engineering of Advanced Materials Nov. 1, 2012 - Oct. 31, 2017

Involved external institutions

Texas A&M University US United States (USA) (US) Montanuniversität Leoben AT Austria (AT)

How to cite

APA:

Merle, B., Maier-Kiener, V., & Pharr, G.M. (2017). Influence of modulus-to-hardness ratio and harmonic parameters on continuous stiffness measurement during nanoindentation. Acta Materialia, 134, 167-176. https://doi.org/10.1016/j.actamat.2017.05.036

MLA:

Merle, Benoit, Verena Maier-Kiener, and George M. Pharr. "Influence of modulus-to-hardness ratio and harmonic parameters on continuous stiffness measurement during nanoindentation." Acta Materialia 134 (2017): 167-176.

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