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Instrumentation of a conventional hardness tester for load-displacement measurement during indentation

Published online by Cambridge University Press:  31 January 2011

G. M. Pharr  and
R. F. Cook
G. M. Pharr
Affiliation:
Department of Materials Science, Rice University, P.O. Box 1892, Houston, Texas 77251
R. F. Cook
Affiliation:
IBM Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598
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Abstract

A conventional microhardness tester has been instrumented with a piezoelectric load cell and capacitance displacement gages to measure load and displacement during indentation. As in other recently-developed load and displacing sensing indentation instruments, the new device can be used to measure a variety of mechanical properties, but has the advantage of being relatively inexpensive to assemble since many of its components are standard equipment. Tests were performed on soda-lime glass and an aluminum alloy, demonstrating the diversity of material elastic-plastic responses under indentation, particularly in the unloading cycle. The data suggest that models of elastic unloading based on invariant indenter-surface contact area may not be general, and may lead to underestimates of hardness and modulus.

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Type
Articles
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Journal of Materials Research , Volume 5 , Issue 4 , April 1990 , pp. 847 - 851
Copyright
Copyright © Materials Research Society 1990

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References

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