CALIBRATION OF INSTRUMENTS FOR HARDNESS TESTING BY USE OF A STANDARD

Joachim Frühauf, Eva Gärtner, Konrad Herrmann, Febo Menelao, Dieter Schwenk, Thomas Chudoba, Hans-Peter Vollmar

Abstract

As a standard for the calibration of force and depth scales of hardness testing instruments a system of silicon springs is described. The standard shows a linear force-deflection characteristic F = k · f up to a stop point (typical: Fst = 420 mN; fst = 22 µm). For the calibration of stiffness and stop point of the standard the characteristic should be measured using a spherical indenter. In view of the practical application for the assessment of instruments also Vickers indenters can be used. In this case indentations are produced. The resulting wear can be minimized by reducing the maximum force and using only the measured stiffness k for a quick assessment.

Keywords

Hardness Testing, Calibration, Si-Standard

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IMEKO-TC5-2007-026.pdf

DOI

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IMEKO TC

TC5 - Hardness Measurement

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