hardness test
31Vickers 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 …
32Rockwell 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… …
33Brinell hardness — Bri·nell hardness brə .nel n the hardness of a metal or alloy measured by hydraulically pressing a hard ball under a standard load into the specimen Brinell Johan August (1849 1925) Swedish engineer. After studying the internal composition of… …
34Mohs hardness — Rough measure of the resistance of a smooth surface to scratching or abrasion, expressed in terms of a scale devised by German mineralogist Friedrich Mohs in 1812. Minerals are ranked in comparison with the Mohs scale, which is made up of 10… …
35Brinell test — [bri nel′] n. 〚after J. A. Brinell (1849 1925), Swed engineer〛 a test for determining the relative hardness (Brinell hardness) of a metal by measuring the diameter of the indentation made when a hardened steel ball is forced into the metal under… …
36Knoop 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… …
37Brinell test — [bri nel′] n. [after J. A. Brinell (1849 1925), Swed engineer] a test for determining the relative hardness (Brinell hardness) of a metal by measuring the diameter of the indentation made when a hardened steel ball is forced into the metal under… …
38Brinell 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… …
39brinell test — noun Usage: usually capitalized B Etymology: after J.A.Brinell : the test to determine Brinell hardness * * * Brinell test, the test for the hardness of metal, determining its Brinell number …
40soap test — noun : a test for determining the hardness of water by adding just enough standard soap solution to produce a lasting lather * * * soap test noun A test for determining hardness of water by amount of standard soap solution required to make a… …
