Study On Analytic Approach And Optimization Method For The Fatigue Life Of Rubber Vibration Isolators

With the rapid development of high-speed train, the railway vehicles have become an important part of the current transportation, and are the most popularly fast transportation tools in our country. When the rail vehicles run on the track, because of the rail line is sometimes difficult to be completely straight, it is inevitable to generate a variety of vibration for the running vehicles, which influence the comfort, stability and safety of vehicles. To this end, a large number rubber parts are used, which mainly damp vibration, and improve the comfort and stability of vehicles. As the rubber parts of use in rail traffic, their reliability directly concerns vehicles’ safety. Especially in the high-speed running train, they are key components. Once it appears the failure problem, it will endanger the vehicle’s safety. The rubber part of use in process bears multi-way loading, and fatigue damage is the main form of failure. Therefore, accurately assessing the service life of rubber parts under cycle loading, and providing a theoretical basis for design and development of rubber components, it has very important theoretical significance and engineering practical value.The main content of this thesis is divided into six sections:The first chapter summarizes the research methods and status about rubber fatigue at home and abroad, and discusses the main factors influencing the fatigue life of rubber;The second chapter summarizes six commonly used hyperelastic constitutive models, and carries out the basic mechanics experiment of rubber material. At the same time, the experimental data are used to fit the constitutive models and the model’s parameters used the finite element analysis are identified;The third chapter summarizes widely used fatigue crack growth models for rubber dynamic currently, carries out the fatigue properties experiments for rubber material, and identifies the related parameters in the model;In the fourth chapter, using the fatigue life analysis method based on the theory of crack energy, the service life of plate rubber heap is predicted. Meanwhile, the verification experiment of practical product is carried out;In the sixth chapter, with the aid of finite element analysis software, the resistant fatigue optimization for plate rubber heap is carried. Through the optimal method, the design’s defect is eliminated, so the service life of rubber product is improved.Finally, all the research works of the thesis are summarized, and the outlook is put forward for the future research work.