Fatigue life prediction method for shipborne rubber shock absorber

LI Dong-fang1,2, ZHAO Ying-long1,2, XIAO Quan-shan1,2
(1.Institute of Noise & Vibration, Naval University of Engineering, Wuhan 430033, China;
2.National Key Laboratory on Ship Vibration & Noise, Wuhan 430033, China)

Abstract: Aiming at the unforeseen fatigue failure problem of rubber shock absorber in ship equipment application, the fatigue life prediction method of marine BE300 rubber shock absorber was studied.Based on the theory of continuum mechanics, the fatigue life prediction model of damper rubber material was established by tensile fatigue test of rubber material.According to the uniaxial tension and uniaxial compression test data fitting results of the rubber material of the shock absorber, the secondorder polynomial constitutive model was selected to simulate the finite element of the rubber shock absorber.According to the finite element simulation results, the maximum principal stress component of the rubber shock absorber was extracted, and the fatigue life prediction of the rubber shock absorber was predicted by the fatigue life prediction model of rubber material.The results indicate that the life prediction results obtained by selecting different fatigue damage parameters are not the same. The results obtained by predicting the life of rubber shock absorber with equal effect into damage parameters are in line with the actual situation. This method can be used to predict the fatigue life of a marine rubber shock absorber.
Key words: rubber shock absorber; tensile fatigue test; finite element simulation; fatigue life prediction