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Vickers hardness numbers are reported as xxxHVyy, e.g. 440HV30, or xxxHVyy/zz if duration of force differs from 10 s to 15 s, e.g. 440HV30/20, where: 440 is the hardness number, HV names the hardness scale (Vickers), 30 indicates the load used in kgf. 20 indicates the loading time if it differs from 10 s to 15 s
A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels .
Mohs hardness of materials (data page) Vickers hardness test; Brinell scale This page was last edited on ...
The hardness number is based on the applied force divided by the surface area of the indent itself, giving hardness units in kgf/mm 2. Microindentation hardness testing can be done using Vickers as well as Knoop indenters. For the Vickers test, both the diagonals are measured and the average value is used to compute the Vickers pyramid number.
At such low load, the hardness values are also overestimated for other materials, for example it exceeds 100 GPa for c-BN. [4] Other researchers, while having reproduced the high ReB 2 hardness at low load, reported much lower values of 19–17 GPa at a more conventional load of 3–49 N, that makes ReB 2 a hard, but not a superhard material ...
where HV is the Vickers hardness in N/mm 2 (or MPa) (i.e., 9.81 x numerical HV), P is the indentation load in N (typically 30 kgf is used) and T is the total crack length (mm) after application of the indenter.
Indentation hardness measures the resistance of a sample to material deformation due to a constant compression load from a sharp object. Tests for indentation hardness are primarily used in engineering and metallurgy. The tests work on the basic premise of measuring the critical dimensions of an indentation left by a specifically dimensioned ...
ISO 48 Rubber, vulcanized or thermoplastic — Determination of hardness ISO 48-1:2018 Part 1: Introduction and guidance; ISO 48-2:2018 Part 2: Hardness between 10 IRHD and 100 IRHD; ISO 48-3:2018 Part 3: Dead-load hardness using the very low rubber hardness (VLRH) scale; ISO 48-4:2018 Part 4: Indentation hardness by durometer method (Shore ...