How is Knoop hardness measured?
How is Knoop hardness measured? Knoop hardness, 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 Bureau of Standards in the United States. What is Knoop hardness test used for? The Knoop hardness test is an alternative to the Vickers hardness test in the micro hardness testing range, and it can be performed on the same universal or micro hardness testing machine. It is mainly used to overcome...