Hardness Test
Hardness Test
Hardness Test
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Brinell hardness test with<br />
nonstandard load or ball diameter<br />
• From fig, d = Dsinφφφφ , giving the<br />
alternative expression of Brinell<br />
hardness number as<br />
P<br />
BHN =<br />
2<br />
Eq.2<br />
( π / 2)<br />
D ( 1−<br />
cosφ)<br />
• In order to obtain the same BHN with a<br />
non-standard load or ball diameter, it is<br />
necessary to produce a geometrical<br />
similar indentations.<br />
• The included angle 2φφφφ should remain<br />
constant and the load and the ball<br />
diameter must be varied in the ratio<br />
Basic parameter in Brinell test<br />
Suranaree University of Technology May-Aug 2006<br />
Tapany Udomphol<br />
P<br />
D<br />
1<br />
2<br />
1<br />
P P<br />
= = Eq.3<br />
D D<br />
2<br />
2<br />
2<br />
3<br />
3<br />
3
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