Vickers hardness number

Vickers hardness number
(HV or VHN) or Vickers pyramid number (VPN)
   a measure of the hardness of a metal introduced by Vickers in 1922. In the Vickers test (suitable for surface-hardened metals), a pyramidal diamond is pressed into the material being tested. The Vickers hardness is the amount of force applied to the diamond divided by the area of the indentation the diamond makes in the material; in practice the diagonal of the pyramidal indentation is measured and the result, computed in kilograms of force per square millimeter, is read from a table. (The reading should be stated as an empirical measurement, without units.) Up to about HV 500, the Vickers hardness is about 1.04 times the Brinell hardness.

Dictionary of units of measurement. 2015.

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  • Vickers hardness number — Vickers hardness number. См. Число твердости по Виккерсу. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • Vickers hardness number — a number indicative of the degree of relative hardness of materials, determined by measuring the long diagonals of indentation made by pressing the pyramidal point of a diamond into the surface of the material being tested; equal to the load in… …   Medical dictionary

  • Vickers pyramid number —    see Vickers hardness number …   Dictionary of units of measurement

  • Vickers hardness test — A Vickers hardness tester The Vickers hardness test was developed in 1924 by Smith and Sandland at Vickers Ltd as an alternative to the Brinell method to measure the hardness of materials.[1] The Vickers test is often easier to use than other… …   Wikipedia

  • hardness number — a number indicative of the degree of relative hardness of materials. See Brinell, Knoop, Rockwell, and Vickers hardness n …   Medical dictionary

  • Vickers hardness — ▪ mineralogy       a measure of the hardness of a material, calculated from the size of an impression produced under load by a pyramid shaped diamond indenter. Devised in the 1920s by engineers at Vickers, Ltd., in the United Kingdom, the diamond …   Universalium

  • diamond pyramid hardness — Vickers hardness number …   Medical dictionary

  • hardness tester — ▪ device       device that indicates the hardness of a material, usually by measuring the effect on its surface of a localized penetration by a standardized rounded or pointed indenter of diamond, carbide, or hard steel.       Brinell hardness is …   Universalium

  • Hardness comparison — There are a large number of hardness testing methods available (eg. Vickers, Brinell and Rockwell). Although it is impossible in many cases to give an exact conversion it is possible to give a comparison table. Hardness Comparison Table See also… …   Wikipedia

  • Vickers number — Metall. a numerical expression of the hardness of a metal as determined by a test (Vickers test) in which the sample is indented under a known pressure by the point of a diamond and the surface area of the indentation is divided into the amount… …   Universalium

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