EFFECT OF LOADING RATE AND DURATION TIME ON INDENTATION HARDNESS MEASUREMENTS

G. Aggag, A. Abu-Elezz

Abstract

Previews studies on the effect of loading rate on the micro and nano indentation hardness showed that both of them affect hardness measurements. Such effect has been included in micro and nano hardness measurements. ISO/FDIS 14577-1 standard determine the loading rate of the indenter for micro hardness showed not exceed 2 µm/sec and for nano hardness should be less then 10 nm/sec. The present study is a trial to reveal the effect of both loading rate and duration time on the macro indentation hardness applied on standard hardness test blocks. A modern Zwick hardness tester that could vary loading rates and duration time over a broad range was used to preform this study. The study showed that a safe loading rate should not exceed 10 µm/sec. It also showed an obvious effect of duration time on the hardness value. It is recommended that the duration value should be stated clearly in such hardness measurement.

Keywords

indentation hardness, loading rate, duration time

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PWC-2006-TC5-011u.pdf

DOI

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IMEKO TC

TC5 - Hardness Measurement

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