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Evaluation of the Effective Radius of Spherical Indenters for Ultra-Microindentation

Published online by Cambridge University Press:  10 February 2011

T. J. Bell ,
J. S. Field ,
F. J. Lesha  and
M. V. Swain
T. J. Bell
Affiliation:
CSIRO Telecommunications and Industrial Physics, Sydney, Australia
J. S. Field
Affiliation:
CSIRO Telecommunications and Industrial Physics, Sydney, Australia
F. J. Lesha
Affiliation:
CSIRO Telecommunications and Industrial Physics, Sydney, Australia
M. V. Swain
Affiliation:
CSIRO Telecommunications and Industrial Physics, Sydney, Australia
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Abstract

To determine the mechanical properties of materials, using spherical ultra-microindentation techniques, the geometry of the part of the indenter in contact with the surface must be well known. However, crystallographic anisotropy ensures that nominally spherical diamond indenters with very small tip radii will not be truly spherical. This paper examines the shape of typical indenters, with nominal tip radii of 5 μm and 10 μm. Atomic force microscopy techniques are used to determine the general form and then using a technique based on Hertzian contact mechanics in combination with load/penetration data obtained by indentation, to determine the effective radius of the part of the indenter in actual contact with the surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 522: Symposium T – Fundamentals of Nanoindentation & Nanotribology , 1998 , 15
Copyright
Copyright © Materials Research Society 1998

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References

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