Verification of Knoop indenters with a Vickers-addressed optical system

Prato, Andrea; Origlia, Claudio; Germak, Alessandro

doi:10.1016/j.measurement.2020.107928

Cited by 1 publication

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“…To estimate the actual frame compliance in this paper, according to ISO 14755-1 Annex C [ 21 ], a series of loading and unloading cycles, performed on a standardized stainless-steel reference block for hardness (ASAHI HV30) at a single indentation point, was applied. Actually, more procedures are available according to standards and recent literature [ 40 , 44 ], based on the actual indentation depth of Vickers indentation [ 49 , 50 , 51 ].…”

Section: Methodsmentioning

confidence: 99%

Indentation Modulus, Indentation Work and Creep of Metals and Alloys at the Macro-Scale Level: Experimental Insights into the Use of a Primary Vickers Hardness Standard Machine

et al. 2021

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In this work, the experimental method and the calculation model for the determination of indentation moduli, indentation work, and indentation creep of metallic materials, by means of macroscale-level forces provided by a primary hardness standard machine at the National Institute of Metrological Research (INRIM) at the at room temperature were described. Indentation moduli were accurately determined from measurements of indentation load, displacement, contact stiffness and hardness indentation imaging and from the slope of the indentation unloading curve by applying the Doerner-Nix linear model; indentation work, representing the mechanical work spent during the force application of the indentation procedure, was determined by calculating the areas under the loading–unloading indentation curve, through fitting experimental data with a polynomial law. Measurements were performed with a pyramidal indenter (Vickers test). The applied force was provided by a deadweight machine, and the related displacement was measured by a laser interferometric system. Applied forces and the occurring indentation depths were simultaneously measured: the resulting loading–unloading indentation curve was achieved. Illustrative tests were performed on metals and alloy samples. Discussion and comments on the suitability of the proposed method and analysis were reported.

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