Abstract
The principal vibration-isolating characteristics of rubbers based on natural rubber and a combination of synthetic isoprene and butadiene rubbers were determined. The static and dynamic moduli, the hysteresis losses, and the logarithmic decrement were measured on an Yerzley mechanical oscillograph (manufactured by the US company Tavdi) in accordance with ASTM D-945. The changes in these characteristics were measured in the process of heat ageing. To convert the data to room temperature, the Arrhenius equation was used. The main changes in the static modulus occur in the first three years, and the main changes in the dynamic modulus in the first five years. Their ratio and the natural frequencies are different for various rubbers and for different storage and service times. The resonance zones are also different. It is concluded that, when predicting the useful life of the vibration isolator, it is necessary to assess all the dynamic and static parameters for each individual case.
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