1.Principle of Leeb hardness testing method
The impact body, which is equipped with tungsten carbide, impacts into the
work piece and rebounds back. The rebound and impact velocities are
measured at the 1mm point from the work piece in the following way: the
integrated permanent magnet will produce directly proportional voltage with
the impact velocity. The Leeb hardness values are calculated by the following
formula:
HL=1000×( V
b
/ V
a
)
In Which
：
HL: Leeb hardness values
V
b
: the voltage produced during the rebound of impact body
V
a
: the voltage produced during the impact of impact body
Figure 1 shows the voltage produced during the impact and rebound of impact
body:
Figure 1 voltage features of output signal
The Leeb hardness values can be converted to other hardness scales directly,
such as HV, HRC, HRB, HB and HS.
2. Summary
2.1 LM-100
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