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Mechanical properties from instrumented indentation: Uncertainties due to tip-shape correction

Published online by Cambridge University Press:  31 January 2011

L. E. Seitzman
L. E. Seitzman
Affiliation:
Naval Research Laboratory, Code 6176, Washington, DC 20375
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Abstract

The quality of hardness H and indentation modulus E* measurements from instrumented indentation is investigated. Load-displacement data from glass and sapphire are obtained by Vickers indentation and converted to H and E* through a series of equations, including those for tip-shape correction. The quality of H and E* is determined by calculating the statistical uncertainty at each step and propagating the uncertainty to the next step. Conventional tip-shape corrections, assuming either constant hardness or constant modulus, introduce significant errors in H and E* when single, continuous correction functions are used. Piecewise correction functions are shown to improve the quality of H and E*. This investigation demonstrates the importance of calculating and propagating uncertainty at each step when converting instrumented indentation load-displacement data to mechanical properties.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 10 , October 1998 , pp. 2936 - 2944
Copyright
Copyright © Materials Research Society 1998

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References

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