Krautkramer DynaPOCKET Issue 03, 04/2005 1-9
Important information about hardness testing using the DynaPOCKET Introduction
1.6 Important information about
hardness testing using the
DynaPOCKET
The following section contains a summary of the most
important technical test requirements that you always
have to observe in order to obtain reliable and repro-
ducible measurement results.
Test material
Surfaces must be free from any impurities (oil, dust,
rust, etc.). Rough surfaces lead to a greater variation
of the single values. If necessary, prepare rough sur-
faces, using our grinding set MIC 1060 (ref. chapter 2).
Test objects having a mass of at least 5 kgs can be
tested without any additional supports; objects weigh-
ing less require a support to which they have to be
tightly coupled. Please use large, inflexible and rigid
metal supports for this purpose.
The test objects should have a minimum wall thick-
ness of 20 mm. We recommend the use of the UCI
hardness tester MIC 10 for test objects having thinner
wall thicknesses.
A Attention:
A yielding or springiness of the test objects may lead
to measuring errors! Please also refer to chapter 7.3.
The rebound method
The rebound method is a dynamic method with a very
high reproducibility of the measurements. The rebound
method does not replace the classical Brinell hardness
testing or other standardized methods, but rather
complements them.
The remaining energy of an impact body is measured
after rebounding from the material surface. Please ob-
serve that the loss of energy is also effected by the
material’s mechanical properties, i.e. mainly on its
modulus of elasticity or Young’s modulus.
The direct comparison with results obtained from stan-
dardized hardness measurements on specific materials
is therefore important for the evaluation of the measur-
ing accuracy of the rebound method.
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