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UCI- Ultrasonic Contact Impedance Method
Terminology:
Definitions:
UCI Method
:
UCI method Ultrasonic Contact Impedance, a hardness testing method developed by
Dr. Claus Kleesattel in 1961 based on the measurement of the frequency shift of a resonating
rod caused by the essentially elastic nature of a of the finite area of contact between the
indenter and the test piece during the penetration.
UCI Hardness Test
: a hardness testing practice using a calibrated instrument by pressing
a resonating rod with a defined indentor, for example, a Vickers Diamond, with a
fixed force against the surface of the part to be tested.
Calibration
: determination of the specific values of the significant operating parameters of
the UCI instrument by comparison with values indicated by a standardized
workbench hardness tester or by a set of certified test blocks.
Verification according to ASTM A 1038-05
Check the UCI hardness testing instrument by making at least 5 measurements on a standard reference
test block of the selected hardness scale.
The instrument shall be considered verified if each hardness reading falls within +/- 3% of the actual
reference test block value.
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