Brinell hardness HBW [kfg/cm
2
]
Brinell Hardness / plastic deformation
Load F
kN
Ball diameter D
mm
Diameter of indentation d/D (range between 0.24 and 0.6)
-
Contact area A
mm
2
Indentation
δ
mm
Brinell Hardness
1
/ Mean contact pressure p
m
MPa
Elastic Deformation / Hertz
Young's modulus E
GPa
GPa
Poisson's ratio ν
Ball diameter D
mm
Mean contact pressure p
mc
= R
p0.2
MPa
Effective Young's modulus E'
GPa
Effective contact radius R'
10
-3
m
Initial contact diameter d = 2r
10
-3
m
Indentation
δ
10
-6
m
Contact load F
c
N
1
HBW300 = 300 kgf/cm
2
= 3000 MPa
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