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Leeb
Hardness Testers
All
Leeb hardness testers operate on the Leeb principle, a dynamic hardness
test method based on velocity measurement. By using a spring loaded
impactor to rebound off of the test surface a velocity before and
after impact is taken. By comparing these two velocities, a measurement
proportional to hardness can be created.
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Bench
(Brinell) Hardness Testers
The
oldest of the hardness test methods in common use today, Brinell
test is frequently used to determine the hardness of forgings and
castings that have a grain structure too course for Rockwell testing.
Therefore, Brinell tests are frequently done on large parts. By
varying the test force and ball size, nearly all metals can be tested
using a Brinell test.
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Shore
Hardness Testers
The
(Shore) Durometer, like many other hardness tests, measures the
depth of an indentation in the material created by a given force
on a standardized presser foot. This depth is dependent on the hardness
of the material, its viscoelastic properties, the shape of the presser
foot, and the duration of the test. There are several scales of
durometer, used for materials with different properties. The two
most common scales, using slightly different measurement systems,
are the type A and type D scales. The A scale is for softer plastics,
while the D scale is for harder ones.
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