depth of hardness

См. также в других словарях:

• 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

• Indentation hardness — tests are used to determine the hardness of a material to deformation. Several such tests exist, wherein the examined material is indented until an impression is formed; these tests can be performed on a macroscopic or microscopic scale. When… …   Wikipedia

• Barcol hardness test — The Barcol hardness test characterizes the indentation hardness of materials through the depth of penetration of an indentor, loaded on a material sample and compared to the penetration in a reference material. The method is most often used for… …   Wikipedia

• 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

• Knoop hardness — ▪ mineralogy       a measure of the hardness of a material, calculated by measuring the indentation produced by a diamond tip that is pressed onto the surface of a sample. The test was devised in 1939 by F. Knoop and colleagues at the National… …   Universalium

• Rockwell hardness number — a number indicative of the degree of relative hardness of materials, determined by measuring the depth of the impression made by a steel or diamond penetrator pressed into the surface of the material being tested. There are a number of Rockwell… …   Medical dictionary

• 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 test — a test to measure hardness by determining the depth of penetration into a specimen of a penetrator under predetermined conditions of test …   Mechanics glossary

• knoop hardness — ˈnüp noun Usage: usually capitalized K Etymology: after F. Knoop, 20th century American chemist : the relative hardness of a material (as a metal) that is determined by the depth to which the bluntly pointed diamond pyramid of a special… …   Useful english dictionary

• rockwell hardness — ˈräˌkwel , kwəl noun Usage: usually capitalized R Etymology: after Stanley P. Rockwell, 20th century American metallurgist : the hardness of a metal or alloy measured by an apparatus in which a diamond pointed cone is pressed into the metal to a… …   Useful english dictionary

• Induction hardening — is a form of heat treatment in which a metal part is heated by induction heating and then quenched. The quenched metal undergoes a martensitic transformation, increasing the hardness and brittleness of the part. Induction hardening is used to… …   Wikipedia