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Analysis of depth-sensing indentation tests with a Knoop indenter

Published online by Cambridge University Press:  31 January 2011

L. Riester ,
T. J. Bell  and
A. C. Fischer-Cripps
L. Riester
Affiliation:
Oak Ridge National Laboratory, MS 6069, P.O. Box 2008, Oak Ridge, Tennessee 37831
T. J. Bell
Affiliation:
CSIRO Division of Telecommunications and Industrial Physics, P.O. Box 218, Lindfield, NSW 2070, Australia
A. C. Fischer-Cripps*
Affiliation:
CSIRO Division of Telecommunications and Industrial Physics, P.O. Box 218, Lindfield, NSW 2070, Australia
*
a)Address all correspondence to this author.
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Abstract

The present work shows how data obtained in a depth-sensing indentation test using a Knoop indenter may be analyzed to provide elastic modulus and hardness of the specimen material. The method takes into account the elastic recovery along the direction of the short axis of the residual impression as the indenter is removed. If elastic recovery is not accounted for, the elastic modulus and hardness are overestimated by an amount that depends on the ratio of E/H of the specimen material. The new method of analysis expresses the elastic recovery of the short diagonal of the residual impression into an equivalent face angle for one side of the Knoop indenter. Conventional methods of analysis using this corrected angle provide results for modulus and hardness that are consistent with those obtained with other types of indenters.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 6 , June 2001 , pp. 1660 - 1667
Copyright
Copyright © Materials Research Society 2001

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References

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