Fatigue Life Prediction of Rubber Isolator Based on Force-Controlled Temperature-Accelerated Fatigue Experiment
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TECHNICAL ARTICLE—PEER-REVIEWED
Fatigue Life Prediction of Rubber Isolator Based on ForceControlled Temperature-Accelerated Fatigue Experiment Zhu Jin . Lin He . Ying-long Zhao
Submitted: 10 April 2017 Ó ASM International 2017
Abstract Fatigue life prediction is very important for the reliability and safety design of rubber isolators. As there is still no precise and credible theoretical or simulation method on fatigue life prediction for the kind of rubber isolators whose shape may change with time during the whole useful life, it means that the experimental method is still the best solution for the problem. A force-controlled temperature-accelerated fatigue experiment is designed for these long-life rubber isolators. The experiment introduced essential factors such as the equipment demands, stress condition, data collection and data processing. Compared with the traditional way, there are four advantages of the new experiment: the time cost of the experiment, the authenticity of the experiment data, the quantity of valid data and the control method of the mechanical load. By calculating the real-time vertical displacement, global stiffness and dissipated energy of the tested sample, the new experiment can improve the quantity of valid data for further researches. Moreover, Arrhenius model is proved accurately to estimate the accelerated life. Keywords Fatigue life prediction Failure Temperature acceleration Rubber isolator
Z. Jin (&) L. He Y. Zhao Institute of Noise and Vibration, Naval University of Engineering, Wuhan, People’s Republic of China e-mail: [email protected] Z. Jin L. He Y. Zhao National Key Laboratory on Ship Vibration and Noise, Wuhan, People’s Republic of China
Introduction As a widely used vibration isolation component in many industry fields, rubber isolators, which are made up of rubber elastomer and metal structural components, commonly have two main functions: one is to support the static load, and the other is to absorb the dynamic load as a viscoelastic body [1]. The rubber isolators undergoing the foregoing loads may arise fatigue cracks and unexpected deformation after a period of time [2, 3]. The emergence of fatigue cracks and deformation due to the aging and degradation of rubber elastomer may cause catastrophic damage to the isolator and the equipment been supported. For this reason, the research on the fatigue life prediction methods is significant for the design, operation and maintenance of the rubber isolators. From the point of fatigue analysis, the input information for calculation is commonly the strain distribution of the sample under a cyclic load; if the sample’s shape holds constantly, the fatigue life can be calculated by establishing the relationship between the unchangeable strain distribution and the fatigue parameters. However, there is still no precise and credible theoretical or simulation method for fatigue life prediction of the kind of rubber isolators whose shape may change with time during the whole useful life, which means that the experimen
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