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Rockwell hardness test
Rockwell hardness test[′räk‚wel ′härd·nəs ‚test] (engineering) One of the arbitrarily defined measures of resistance of a material to indentation under static or dynamic load; depth of indentation of either a steel ball or a 120° conical diamond with rounded point, ¹⁄₁₆, ⅛, ¼, or ½ inch (1.5875, 3.175, 6.35, 12.7 millimeters) in diameter, called a brale, under prescribed load is the basis for Rockwell hardness; 60, 100, 150 kilogram load is applied with a special machine, and depth of impression under initial minor load is indicated on a dial whose graduations represent hardness number. Rockwell hardness test
Rock·well hard·ness test (rokwel hahrdnĕs test) Common dental assessment to determine hardness of ductile materials using a hard ened steel ball or diamond point; hardness is related to depth of penetration and measured directly by the instrument.
See also: Brinell hardness test |