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Effective indenter radius and frame compliance in instrumented indentation testing using a spherical indenter

Published online by Cambridge University Press:  31 January 2011

Seung-Kyun Kang ,
Ju-Young Kim ,
Ingeun Kang  and
Dongil Kwon
Seung-Kyun Kang
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Ju-Young Kim*
Affiliation:
Materials Science, California Institute of Technology, Pasadena, California 91106
Dongil Kwon
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
*
a) Address all correspondence to this author. e-mail: jyk@caltech.edu
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Abstract

We introduce a novel method to correct for imperfect indenter geometry and frame compliance in instrumented indentation testing with a spherical indenter. Effective radii were measured directly from residual indentation marks at various contact depths (ratio of contact depth to indenter radius between 0.1 and 0.9) and were determined as a function of contact depth. Frame compliance was found to depend on contact depth especially at small indentation depths, which is successfully explained using the concept of an extended frame boundary. Improved representative stress-strain values as well as hardness and elastic modulus were obtained over the entire contact depth.

Keywords

HardnessSteelStress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 9 , September 2009 , pp. 2965 - 2973
Copyright
Copyright © Materials Research Society 2009

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