# Rubber Creep Model and Its Influence on Mounting Stiffness
## 1 Introduction
The results show that with the increase of temperature, creep flexibility increases, while tensile strength increases and creep flexibility decreases. [PERSON] et al. proposed an engineering method to evaluate time-dependent rubber vibration-isolation components with creep and stress relaxation, introducing a time-dependent damage function in the superelastic model. The results showed that the predicted values were well matched with the experimental data [12]. Many domestic scholars also have more research results in rubber creep. In terms of rubber material formulation, [PERSON] et al. [13] studied the creep recovery performance and temperature influence of rubber doped with different graphenes and analyzed and evaluated the creep and recovery test results of composite rubber by using a four-parameter model and distribution function method. The results show that the doping of graphene can improve the creep resistance of rubber. [PERSON] [14] studied the effects of carbon black and additives on rubber creep and concluded that as the diameter of carbon black increases, the creep of rubber decreases, and different additives have different effects on creep. In terms of rubber creep simulation analysis and test, [PERSON] et al. [15] fitted the constitutive parameters of rubber materials through tests, established linear and nonlinear viscoelastic creep models, performed creep tests on rubber samples, and concluded that viscoelasticity is limited creep. [PERSON] et al. [16] obtained different samples of polypropylene material within a certain frequency and pressure range, then applied the same load to these samples, and after a certain period of time, observed the creep of these samples. Studies have shown that when the frequency is maintained at a certain time, the greater the pressure of molding, the smaller the creep variable of the polypropylene material sample, and when the molding process keeps the pressure unchanged, the greater the fatigue of the molding, the greater the creep variable. [PERSON] et al. [17] conducted a dynamic test on the rubber shock absorber and studied the influence of rubber creep on the shock absorber. The results show that the greater the creep, the greater the damping and dynamic stiffness of the rubber shock absorber. They concluded that rubber creep will affect the vibration isolation effect of the shock absorber and proposed a plan for the improvement of rubber creep. [PERSON] [18] introduced different constitutive models of rubber materials, combined with a new rubber material of polyurethane; through rubber test data, the constitutive parameters of the material were fitted by simulation software, and creep analysis was performed on the material. In terms of rubber creep constitutive model and secondary development, [PERSON] [19] conducted creep analysis on the water-lubricated bearing on the basis of considering the creep of the rubber bearing material, combined with the Kelvin creep model and the three-component solid creep model, and obtained the changes of the lubrication film pressure and film thickness of the water-lubricated shaft under the influence of rubber creep. [PERSON] [20] carried out finite element simulation analysis on the vertical stiffness characteristics and creep variables of the rubber axial spring and concluded that it provides a guarantee for the development and design of the rubber axial spring. [PERSON] [21] used secondary development technology to realize Sturger and Kburger models and analyzed the influence of different function changes on creep by combining relevant calculation model parameters. In order to solve the creep problem of mounting rubber, the creep characteristics of mounting rubber were studied. In order to study the influence of creep characteristics on engine mounting stiffness, a theoretical model of engine mounting creep was established based on the creep mechanism of rubber. The effects of different loads on the creep characteristics of engine mount were studied.