- hardness measurement
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определение твердости
Англо-русский словарь терминов металлургии и сварки. 2011.
hardness measurement
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hardness — a measure of the hardness of a metal or mineral. Hardness is a property easy to appreciate but difficult to quantify and measure. The Mohs hardness scale is used in geology to give a rough estimate of hardness by testing which minerals are… … Dictionary of units of measurement
Hardness — This article is about mechanical properties of materials. For other uses, see Hard. Hardness is the measure of how resistant solid matter is to various kinds of permanent shape change when a force is applied. Macroscopic hardness is generally… … Wikipedia
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… … Dictionary of units of measurement
pencil hardness — a traditional measure of the hardness of the leads (actually made of graphite) in pencils. The hardness scale, from softer to harder, takes the form ..., 3B, 2B, B, HB, F, H, 2H, 3H, 4H, .... The letters stand for Black, Hard, and Firm. (There … Dictionary of units of measurement
Knoop hardness — (HK or KHN) a measure of the hardness of a metal introduced by Knoop in 1939. The Knoop test is similar to the Vickers test in that a diamond penetrator is used to indent the sample being tested, but it uses a rhombohedral diamond rather than… … Dictionary of units of measurement
Rockwell hardness — (RH ) a measure of the hardness of a metal introduced by Rockwell in 1922. In a Rockwell hardness test, a penetrator makes an indentation in the metal under two constant loads, a minor load (generally 10 kilograms) and then a major load. The… … Dictionary of units of measurement
Brinell hardness — (HB or BHN) a measure of the hardness of a metal introduced by J. A. Brinell in 1900. In the Brinell test (generally used for metals of uniform hardness), a hard object such as a steel ball is pressed into the material being tested. The… … Dictionary of units of measurement
Barcol hardness — (BH) a measure of hardness, primarily for plastics and soft metals, made with a Barcol Impressor. Measurements on the Barcol scale are typically between 30 and 90. There is no precise conversion between these readings and other hardness scales … Dictionary of units of measurement
Mohs hardness scale — a 1 10 scale for estimating the hardness of a mineral, introduced by the German geologist Friedrich Mohs (1773 1839) in 1812. To apply the scale, one attempts to scratch the mineral with standard minerals assigned hardness numbers as follows:… … Dictionary of units of measurement
measurement — The fundamental concepts of the theory of measurement are that of a quantity being measured, an empirical determination for a lesser, equal, or greater amount of the quantity, and then a rule assigning numerical values to the quantities… … Philosophy dictionary
hardness — I (New American Roget s College Thesaurus) Solidity Nouns 1. hardness, rigidity, inflexibility, temper, callosity; toughness; petrification, lapidification, lapidescence; vitrification, ossification; crystallization. See density, strength. 2.… … English dictionary for students
