Johan August Brinell
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Swedish engineer John August Brinell (1849–1925) is the creator of the Brinell hardness test and namesake of the failure mechanism known as brinelling.
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This article about an engineer, inventor or industrial designer is a stub. You can help Wikipedia by expanding it.(b. Nov. 21, 1849, Bringetofta, d. Nov. 17, 1925, Stockholm), began his career as an engineer at the Lesjöfors Ironworks and in 1882 became chief engineer at the Fagersta Ironworks. 1903-14 he was chief engineer at Jernkontoret.
He is probably best known today for the Brinell hardness test, a rapid, non-destructive means of determining the hardness of metals. The test is based on the measurement of the impression left by a 10-millimetre-diameter hardened steel or carbide ball after it is pushed into the metal with a 3,000-kilogram load. The Brinell hardness number is obtained by dividing the load, in kilograms, by the spherical area of the indentation in square millimetres; 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.
But more important still was Brinell’s pioneering work concerning phase transformations in steel. While at Fagersta, Brinell made extensive studies of the internal composition of steel during cooling and heating. "Om ståls texturförändringar under uppvärmning och avkylning" ("About texture changes in steel during heating and cooling") was published in Jernkonorets Annaler 1885. Using very primitive equipment, relying on his own eyes and experience, Brinell continued his research for many years and achieved results that "deeply affected the world’s industry." His discoveries about the control of the carbon containing phases still form the basis of our knowledge about the properties of steel
Excerpt from: http://www.brinell.kth.se/Johan_August_Brinell.htm
