Principles of work of electronic durometers

Abstract

Electronic durometers found a wideuse for control of hardness of details, both in the process
of production and in the process of exploitation. The large variety of these devices is taken just to
four principles of measuring of hardness – on a rebound, on the difference of frequencies between
the eigenfrequency of vibrations of the diamond-pointed pyramid and frequency of the preliminary
loaded diamond-pointed pyramid, determinations of hardness on the size of electric resistance of the
special diamond-pointed pyramid and realizing method of visualization of imprint of indenter.
Most widely many firms and companies are present dynamic durometers (ASTM A956-06), workings
on the method of rebound (hardness on Leeb, HL) and ultrasonic durometers (ASTM A1038) which use the
resonance-impedance method of measuring of hardness (Ultrasonic Contact Impedance– UCI method).
Unique method of Esa Test®, proper Din50 158 was developed and patented a firm Ernst
(Switzerland).V present tense it is used only in the devices of this company. Principle of
determination of value of hardness on the method of Rockwell (En10109-3) was applied the same
firm due to the device patented by them, a stride in development of mobile durometers was become
by the issue of durometer, realizing the method of visualization of imprint of indenter at measurings
of hardness of material on Vickers (TIV). The basic brands of modern durometers are resulted and
principles and methods are described measurings of hardness, which they use.