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On the measurement of energy dissipation using nanoindentation and the continuous stiffness measurement technique

Published online by Cambridge University Press:  04 November 2013

Erik G. Herbert*
Department of Materials Science and Engineering, University of Tennessee, College of Engineering, Knoxville, Tennessee 37996-2200
Kurt E. Johanns
Department of Materials Science and Engineering, University of Tennessee, College of Engineering, Knoxville, Tennessee 37996-2200
Robert S. Singleton
Department of Materials Science and Engineering, University of Tennessee, College of Engineering, Knoxville, Tennessee 37996-2200
George M. Pharr
Department of Materials Science and Engineering, University of Tennessee, College of Engineering, Knoxville, Tennessee 37996-2200; and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6132
a)Address all correspondence to this author. e-mail:
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New experimental methods have been developed to optimize the accuracy and precision of the measured phase angle in nanoindentation experiments on viscoelastic materials performed with a Berkovich indenter. Measurements conducted in fused silica and sapphire form the basis of a new instrument calibration. Experimental verification of the new calibration and an enhanced test method is demonstrated in polycarbonate (PC) and polymethyl methacrylate (PMMA). In comparison to the standard continuous stiffness measurement (CSM) technique, the new calibration and test method reduces the measurement error in the phase angle of PC from 1900% to 10% and from 135% to 10% in PMMA. Scatter in phase angle measured by the new test method is nearly 10 times less than the level observed using the standard CSM technique. The effect of time dependent deformation on the measured phase angle is also documented. The experimental observations and results are applicable to a variety of dynamic nanoindentation test methods.

Copyright © Materials Research Society 2013 

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