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Application of spherical nanoindentation to determine the pressure of cavitation impacts from pitting tests

Published online by Cambridge University Press:  13 September 2011

Davide Carnelli ,
Ayat Karimi  and
Jean-Pierre Franc
Davide Carnelli*
Affiliation:
Institute of Condensed Matter Physics, Swiss Federal Institute of Technology Lausanne, CH-1015 Lausanne, Switzerland
Ayat Karimi
Affiliation:
Institute of Condensed Matter Physics, Swiss Federal Institute of Technology Lausanne, CH-1015 Lausanne, Switzerland
Jean-Pierre Franc
Affiliation:
Laboratory of Geophysical and Industrial Flows (LEGI), Grenoble Institute of Technology, 38041 Grenoble Cedex 9, Grenoble, France
*
a)Address all correspondence to this author. e-mail: davide.carnelli@epfl.ch
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Abstract

This article focuses on the use of spherical nanoindentation measurements to estimate the pressure of cavitation impacts and its statistical distribution. Indeed, nanoindentation techniques are supposed to represent an effective tool in this field due to the similarities between substrate deformation under liquid impact and indentation testing. First, nanoindentation experiments were used to extract the mechanical parameters of a Nickel–Aluminum–Bronze alloy; second, pitting tests were performed at different operating pressures, and the geometrical characteristics of the pits were measured; and finally, the spectra of impact pressure and loads responsible for material erosion were obtained by coupling the findings of indentation tests with the analysis of pitting tests. Results assessed the capability of the proposed methodology to quantify the hydrodynamic aggressiveness of the cavitating flow. This procedure, which assumes the material itself as a sensor that is able to detect the impact loads, could represent an alternative solution to pressure transducers in estimating the cavitation intensity.

Keywords

NanoindentationNanostructureStress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 1: Focus Issue: Instrumented Indentation , 14 January 2012 , pp. 91 - 99
Copyright
Copyright © Materials Research Society 2011

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