A Study On Uniaxial Fatigue Fatigue Characteristics Experiments And Prediction Methods Of The Rubber Isolator

Rubber isolators are widely used in the vibration isolation system of automobile. This isprimarily due to their excellent vibration isolation properties, good water and air resistance,good cushion performance, high tensile strength and high wear resistance. However, theresearch undertaken so far was mainly focused on the damping properties of the rubbercomponents, and only a few investigations were on their fatigue durability. It is accepted thatbefore the full benefit of the rubber isolators can be realised in the automobile industry, afurther study on the fatigue properties of the rubber isolators has yet to be seen especially inChina. In this research project, to improve the fatigue and endurance performance of therubber isolators, the fatigue properties test and fatigue-life prediction method of rubberisolators have been studied based on the basic fatigue-life prediction theory of the rubberisolators. It is with reason to believe that the achievement of this research would have asignificant value in both academic and engineering fields. The following summarises the maincontents of this research:1) Fatigue-life prediction model of rubber materials has been established. Thefrequently-used damage parameters for evaluating rubber materials fatigue-life have beenintroduced. And then bearing and deformation results of rubber elements have been analysed.Thus, tensor form fatigue-life prediction formula, new combined damage parameters forevaluating rubber materials fatigue-life and the reliability distribution probability linearfunction of the rubber materials fatigue-life has been obtained.2) The methodology for studying the force-displacement calculation accuracy of rubberisolator has been developed. The influence of the materials strain combination on the fittingaccuracy of the five types of constitutive model parameters has been analysed. The mechanicscalculation method of the rubber isolators has been studied. Then, the influence of thedifference constitutive model and materials strain combination on the calculation results hasbeen obtained by finite element method and simulation test method. The experiment methodand results in this part can shed useful light on the design of the rubber isolator and provideexperimental support to theoretical analysis and simulation of the rubber isolator.3) The fatigue test methodology of rubber materials has been designed. The incentive loadof rubber fatigue testing has been made parameter evaluation. And load nature has beenclassified and transformed. The experiment subject, such as the rubber material specimen,rubber test column and annular rubber test column, has been designed. The test methods, testprinciple and the actual measurement and calculation of part of the evaluation parameters have been studied. And then, the relevant conclusion of the fatigue test method and principleof rubber suspension has been obtained. The experimental method and principle in this partare very useful for fatigue test design of rubber materials.4) The fatigue failure prediction method of rubber materials has been developed. Fatiguedamage equivalent parameters have been calculated by using the finite element method. Andthe stress and strain field has been analysed. The fatigue-life tendency of the rubber materialsparts has been predicted by employing the new fatigue prediction model. And a more accuratefatigue life prediction formula of carbon black filled natural rubber has been obtained. Then,the reliability analysis of the distribution probability of the rubber fatigue life has been carriedout by using the statistic method.