A correction method for Vickers indenters squareness measurement due to the tilt of the pyramid axis

Prato, Andrea; Galliani, Davide; Origlia, Claudio; Germak, Alessandro

doi:10.1016/j.measurement.2019.04.007

Cited by 4 publications

(3 citation statements)

References 5 publications

(5 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…The first rotation, around the indenter-holder axis, represents the measurement of quadrilateral base angles. The second rotation around the axis parallel to the plane of the lens represents the measurement of the supplementary angles of each lateral face from which the angles between two opposite faces and the angle between the axis of the diamond pyramid and the axis of the indenter holder are obtained [25], as required for the verification of Vickers indenters. Using these measurements as input of a suitable geometrical model, presented in the following Section, the possibility to evaluate the geometrical parameters of Knoop indenters is investigated.…”

Section: The Gal-indent Optical Systemmentioning

confidence: 99%

Verification of Knoop indenters with a Vickers-addressed optical system

2020

Self Cite

View full text Add to dashboard Cite

“…Rotations around the indenter-holder axis represent the measurement of the angles between two consecutive faces, i.e. the quadrilateral base angles φ (two angles nominally 164°) and τ (two angles nominally 16°); whereas, rotations around the axis normal to the plane containing the indenter-holder axis and the optical lens axis represent the measurement of the supplementary angles for each lateral face ω (nominally 25.22°) from which the angles between two opposite faces (nominally 129.57°) are easily obtained [7]. Such values, used as input in a suitable geometrical model, allow to evaluate the angles from the opposite edges at the vertex α and β, nominally equal to 172.5° and 130°, respectively, and the tilt angle δ, nominally equal to 0°.…”

Section: The Gal-indent Optical Systemmentioning

confidence: 99%

A suitable geometrical model for the verification of Knoop indenters with Gal-Indent optical system

2020

View full text Add to dashboard Cite

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.

show abstract

A correction method for Vickers indenters squareness measurement due to the tilt of the pyramid axis

Cited by 4 publications

References 5 publications

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

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

Verification of Knoop indenters with a Vickers-addressed optical system

A suitable geometrical model for the verification of Knoop indenters with Gal-Indent optical system

Contact Info

Product

Resources

About