Legacy
Brinell is best known today for the Brinell hardness test, which he proposed in 1900. In this test a 10-millimetre diameter hardened steel or carbide ball is pushed into the surface of the material being tested, with a 3000 kg imposed load. The depth to which the ball penetrates the material surface is an indication of the Brinell Hardness Number, which is calculated as follows:
BHN = load in kilograms divided by the spherical area of the indentation in square millimetres (refer to Brinell scale for method of calculation)
It is a rapid, non-destructive (except at the surface being tested) means of determining the hardness of metals. This area is a function of the ball diameter and the depth of the indentation. With minor variations, his test still remains in wide use. This method is best for achieving the macro-hardness of material, particularly those materials with hetrogenous structure.
Read more about this topic: Johan August Brinell
Famous quotes containing the word legacy:
“What is popularly called fame is nothing but an empty name and a legacy from paganism.”
—Desiderius Erasmus (c. 1466–1536)