A proposed method for predicting rubber isolators' fatigue performances including fatigue life, failure location and crack orientation is free from the traditional fatigue destruction experiment. Cracking energy density and fatigue crack growth characteristic of the studied rubber material are used in the proposed method. A typical type of rubber isolator is taken as the application subject so as to validate the proposed formula. The comparisons of the calculated and the measured results (fatigue life, failure location and crack orientation) reveal that an acceptable consistence is met. Especially, the predicted fatigue life falls within a factor of 1/2 of the experimental life, which is accepted in engineering. The proposed method for predicting fatigue performances, which needs fatigue crack growth experiment instead of the traditional fatigue experiment that costs a lot of rubber materials, would give a direct guideline for fatigue-proof design of rubber isolators.
Key words
rubber isolator /
cracking energy density /
tearing energy /
fatigue performance /
prediction
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