Assessing durability of the rubber damping elements exposed to dynamic loading

The paper uses the model experiment method to identify the influence of the dynamic loading frequency and amplitude on the rubber damping elements service life. Experimental samples in the form of parallelepipeds with the 8?12?37 mm dimensions made from rubber grades 51–1562, SKU-8 and IRP-1401 with the 6MPa high-elasticity modulus and 65…80 Shore A units hardness were tested. Loading frequency, deformation amplitude and dissipative heating temperature were selected as the independent factors influencing the service life. The number of loading cycles before the fatigue microcracks onsets on the experimental samples was accepted as the dependent factor. The MRS-2 machine was introduced in testing. The experiments were conducted at the loading frequency of 250 and 500 inclusions per minute, deformation amplitude of 10, 15, 20, 30, 40, and 50% and temperature of 23...120?С. Analysis of the experimental research data showed that the damping elements made of rubber 51–1562 were having the highest resource. The paper shows that the deformation amplitude provides a nonlinear effect on the elements durability. Amplitude decrease in the range of 40...10% makes it possible to increase durability by 4.7...33 times. Changing the loading frequency in the range of 250...500 switching cycles reduces the resource by 1.21–1.79 times. Increasing the temperature up to 60...120 ?С leads to a radical nonlinear decrease in durability by 9...16 times depending on the rubber brand.
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