| The fatigue life of rubber products has always been concerned in the rubber fields.Rubber as a special hyperelastic material,the factors that affect its fatigue life are more complex.With the development of computer hardware and the maturity of finite element method,it is possible to predict the fatigue life of rubber products by means of finite element method.The traditional experiment method analysis for the fatigue life of rubber products is not only time-consuming,but also high cost and contingent.Therefore,the finite element method(FEM),as a new efficient and reliable method,for predicting the fatigue life of rubber products is widely used.In this study,the finite element analysis code ABAQUS and fatigue analysis software FE-SAFE were used to calculate the stress and strain fields of the cologne eggs elastic fastener and the non-pneumatic safety tires and to further predict their fatigue life.In this paper,a rubber dumbbell-shaped specimen was used to confirm the numerical scheme.Firstly,fatigue life of 100% strain was measured by the experimental method.Scendly,a dumbbell-shaped specimen with the same size was established in ABAQUS,and the stress field was calculated.Thirdly,the stress field results were imported into the FE-SAFE,and then the S-N experimental curve was input as the material library of fatigue analysis.The fatigue life of the rubber dumbbell-shaped model obtained by the above two software is in good agreement with the fatigue life obtained by the experiment,which verified the feasibility of the numerical scheme.The influence of the structural parameters on the static stiffness and fatigue life of the cologne eggs rubber elastic fastener is mainly studied from the aspects of the thickness and tilt angle of the rubber ring.Compared with the experimental data,it is shown that the static stiffness of the cologne eggs elastic fastener decreases with the increase of the thickness and tilt angle of the rubber ring.The S-N curve of rubber material in the cologne eggs elastic fastener was obtained by the equally accelerated experiment method.The curve was also introduced into FE-SAFE to predict the fatigue life.It is shown that the fatigue failure position and fatigue life of the cologne eggs elastic fastener are basically consistent with the actual situation.When the cologne eggs elastic fasteners are applied in the subway straight sections,the rubber ring tilt angle has a great impact on its fatigue life.In this case,it is suitable for the elastic fastener with the much larger tilt angle of the rubber ring.However,when the cologne eggs elastic fasteners are applied in the turning section of the subway,it is suitable for the elastic fastener with the large tilt angle and the large thickness of the rubber ring.For the non-pneumatic safety tires,the influence of the varation of the support structure on its static stiffness curve,running stability and fatigue life is discussed.First,a non-pneumatic tire with the rhombohedral holes structure support was designed;it is found that the running stability is deteriorated due to the location differences of the touching road for the tire during the rolling process.However,through the simulation of the improved structure,it is found that the performance of the non-pneumatic tire may match with that of the same size pneumatic radial tire.Moreover,the running stability and the fatigue life of the airless tire with the staggered structure support are much better than that of the tire with the rhombohedral holes structure support. |
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