ISO 4545-2 and 4545-3 of Knoop hardness tests require the geometrical verification of the indenters.INRiM hardness laboratory, in cooperation with Galileo-LTF, has developed the Gal-Indent optical mea-suring system for the verification of Vickers indenters. This system can measure the vertex anglesbetween two opposite faces, the quadrilateral base angles and the pyramid axis tilt angle. Using thesemeasured quantities as inputs of a suitable geometrical model, the angles between the opposite edgesat the vertex of Knoop indenters, nominally 172.5°and 130°, and the angle between the pyramid andindenter holder axes can be verified with an expanded uncertainty of 0.05°. Comparison of experimentalmeasurements performed on three different Knoop indenters, previously verified by an accredited labo-ratory, shows compatible results. The proposed geometrical model could be easily implemented by lab-oratories that adopt similar measuring systems addressed for the verification of Vickers indenterswithout any modification of the experimental apparatus

Verification of Knoop indenters with a Vickers-addressed optical system / Prato, Andrea; Origlia, Claudio; Germak, Alessandro. - In: MEASUREMENT. - ISSN 0263-2241. - 163:(2020), p. art. no. 107928. [10.1016/j.measurement.2020.107928]

Verification of Knoop indenters with a Vickers-addressed optical system

Prato, Andrea
Writing – Original Draft Preparation
;
Origlia, Claudio
Membro del Collaboration Group
;
Germak, Alessandro
Supervision
2020

Abstract

ISO 4545-2 and 4545-3 of Knoop hardness tests require the geometrical verification of the indenters.INRiM hardness laboratory, in cooperation with Galileo-LTF, has developed the Gal-Indent optical mea-suring system for the verification of Vickers indenters. This system can measure the vertex anglesbetween two opposite faces, the quadrilateral base angles and the pyramid axis tilt angle. Using thesemeasured quantities as inputs of a suitable geometrical model, the angles between the opposite edgesat the vertex of Knoop indenters, nominally 172.5°and 130°, and the angle between the pyramid andindenter holder axes can be verified with an expanded uncertainty of 0.05°. Comparison of experimentalmeasurements performed on three different Knoop indenters, previously verified by an accredited labo-ratory, shows compatible results. The proposed geometrical model could be easily implemented by lab-oratories that adopt similar measuring systems addressed for the verification of Vickers indenterswithout any modification of the experimental apparatus
File in questo prodotto:
File Dimensione Formato  
1-s2.0-S0263224120304668-main.pdf

non disponibili

Tipologia: final published article (publisher’s version)
Licenza: Non Pubblico - Accesso privato/ristretto
Dimensione 1.3 MB
Formato Adobe PDF
1.3 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Verification of Knoop Indenters_post print.pdf

Open Access dal 19/05/2022

Tipologia: accepted manuscript (author’s post-print)
Licenza: Creative Commons
Dimensione 717.01 kB
Formato Adobe PDF
717.01 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/62430
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 1
social impact