Research on constitutive models of hydrogenated nitrile butadiene rubber for packer at different temperatures

In order to solve the problem of packer rubber failure at variable temperature and explore the effect of temperature on constitutive model of hydrogenated nitrile butadiene rubber (HNBR) for packer,this paper concludes that the Yeoh model is the most suitable for HNBR by comparing the experimental data at room temperature with the several common classical hyperelastic models. And it also concludes with a modified Yeoh model for different temperatures by modifing the material parameters as the temperature functions. And the stress-strain relationship of HNBR at different temperature is obtained,which can be used to prove the correctness of the model. Finally, the conclusion that the contact stress between packer rubber and casing increases with the increase of temperature is obtained through the case analysis of HNBR cylinder. The HNBR constitutive model obtained in this paper can provide theoretical basis for the engineering application of HNBR materials. It also extends the field that temperature affects on the HNBR constitutive model.