Abstract
ISO 4545-2 and 4545-3 of Knoop hardness tests require the geometrical verification of the indenter. INRiM hardness laboratory developed a specific measuring system, commercialized by Galileo- LTF (R) as Gal-Indent optical system, which is used for the verification of Vickers indenters. This system is able to measure the vertex angles of the indenter between two opposite faces, and the four quadrilateral base angles. Using such quantities as inputs of a suitable geometrical model, the geometry of Knoop indenters can be verified. This work deals with the description of the system and the geometrical model.
Highlights
Knoop indenter is a rhombic-based pyramidal diamond that produces an elongated diamondshaped indent
ACTA IMEKO | www.imeko.org geometrical parameters of a Vickers indenter required by the standard, i.e. the two vertex angles between two opposite faces and the four angles of the square base, both with an expanded uncertainty of 0.05°
∑4i=1 4 βj ISO 4545-2 and 4545-3 of Knoop hardness tests require the geometrical verification of the indenter
Summary
Knoop indenter is a rhombic-based pyramidal diamond that produces an elongated diamondshaped indent. INRiM hardness laboratory developed a specific measuring system, commercialized by the Galileo-LTF as Gal-Indent optical system for the verification of the geometrical characteristics of Vickers indenters [35]. ACTA IMEKO | www.imeko.org geometrical parameters of a Vickers indenter required by the standard, i.e. the two vertex angles (nominally 136°) between two opposite faces and the four angles of the square base, both with an expanded uncertainty of 0.05°. Using these measured quantities as input of a suitable geometrical model, the possibility to verify Knoop indenters is investigated. This paper deals with the description of the system and the geometrical model
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