Brinell Hardness Number

Written by Jerry Ratzlaff on . Posted in Classical Mechanics

brinell hardness numberBrinell Hardness Number, abbreviated as BHN or HB, is a value assigned to the hardness of metals and alloys.  To do this a steel ball is pressed into the surface of an object by a known load to deform the material.

Brinell Hardness Number Formula

\(\large{ BHN = \frac{2\;F_a}{\pi \; D \; \left( D - \sqrt( D^2 - d^2)  \right) }  }\)         

Where:

\(\large{ BHN }\) = Brinell Hardness Number

\(\large{ F_a }\) = applied load

\(\large{ d }\) = depression diameter

\(\large{ D }\) = steel ball diameter

\(\large{ \pi }\) = Pi

 

Tags: Equations for Structural Steel