EXPERIENCE IN THE METROLOGICAL CHARACTERIZATION OF PRIMARY HARDNESS STANDARD MACHINES

Alessandro Germak, Alfonso Liguori, Claudio Origlia

Abstract

The Istituto Nazionale di Ricerca Metrologica (INRIM) and Galileo section of LTF S.p.a. have cooperated for many years in the field of hardness for developing and improving Primary Hardness Standards and measuring systems for their laboratories. With this experience, Galileo-LTF has realized many installations for several NMIs in the world. All these Hardness Standards and measuring systems have been metrologically characterised by INRIM. In the paper, experiences made during the metrological characterization will be shown. They include the methods and results of direct verification of influence parameters (force, displacement, time, velocity, angle, etc.) and of indirect verification (hardness scales or indenters comparison) of the systems.

Keywords

hardness, primary standards, measuring systems

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IMEKO-TC5-2007-014.pdf

DOI

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IMEKO TC

TC5 - Hardness Measurement

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