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4.4
Surface curvature and selecting the right support ring
When the radius of the surface curvature is ˂30 mm, we recommend you to use the smaller
support ring with an outer diameter of approx. 14 mm. If the radius of the surface curvature is ˃30
mm, the larger support ring with an outer diameter of approx. 20 mm should be used.
5
Background information
5.1
Measuring principle
Measurements are made in line with the Leeb principle, i. e. an impact body that has a certain
weight hits the surface of the material to be tested at a given speed. The speed of the impact and
of the rebound of the impact body will then be measured 1 mm above the point of impact.
Formula:
HL = 1000 * B / A
HL
=
B
=
A
=
Leeb hardness
Rebound speed
Impact speed
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