Principles of work of electronic durometers
A Lyapunov · Engineering · 2016
Electronic durometers found a wideuse for control of hardness of details, both in the processof production and in the process of exploitation. The large variety of these devices is taken just tofour principles of measuring of hardness – on a rebound, on the difference of frequencies betweenthe eigenfrequency of vibrations of the diamond-pointed pyramid and frequency of the preliminaryloaded diamond-pointed pyramid, determinations of hardness on the size of electric resistance of thespecial 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), workingson the method of rebound (hardness on Leeb, HL) and ultrasonic durometers (ASTM A1038) which use theresonance-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 ofdetermination of value of hardness on the method of Rockwell (En10109-3) was applied the samefirm due to the device patented by them, a stride in development of mobile durometers was becomeby the issue of durometer, realizing the method of visualization of imprint of indenter at measuringsof hardness of material on Vickers (TIV). The basic brands of modern durometers are resulted andprinciples and methods are described measurings of hardness, which they use.