Analysis Of Hysteresis Nonlinear Characteristics Of Metal Rubber And Influencing Factors

Metal rubber is a kind of vibration isolation material,which has the advantages of high and low temperature resistance,corrosion resistance,long service life and so on.The metal rubber has a dense elastic porous structure,and the internal spiral coil interaction during loading and unloading causes the metal rubber to show strong nonlinear hysteresis characteristics.The nonlinear hysteresis characteristics for metal rubber materials research has obtained certain achievement,established the mathematical model of multiple although these models have their characteristics and applicable scope,but along with the further promotion of the application of metal rubber material,hysteresis characteristics of metal rubber needs to be more careful description,especially in the description of hysteresis nonlinear relationship between stiffness and damping characteristics,the model has some limitations.Therefore,by analyzing the mechanism of metal rubber damping,this paper subdivides the equivalent damping into viscous damping and dry friction damping to describe the hysteresis nonlinear characteristics of metal rubber at different deformation stages in detail.The static and dynamic tests of metal rubber specimens were carried out to study the influencing factors of hysteretic and nonlinear characteristics of metal rubber,so as to provide theoretical basis for the design and use of metal rubber.Metal rubber contains elastic damping and energy consumption damping,among which the elastic damping force is highly nonlinear due to the interaction of metal wires inside the metal rubber,which is expressed by five higher order polynomials in the mathematical expression.The viscous damping force and dry friction damping force are the main components,and the viscous damping force is related to the excitation frequency and deformation.And dry friction damping force and energy consumption in the process of metal rubber wire spiral roll contact state,so this article from the micro perspective,infinitesimal analysis method was used to study the dry friction mechanism,and combined with the unloading process change law of infinitesimal body sliding state number in mathematical expression to determine the dry friction,metal rubber is obtained with memory restoring force model.In order to verify the reliability of the model,this paper carries out parameter identification and experimental research on the model.Metal rubber internal contact close degree and the relative density,the deformation,the wire diameter and preloading displacement,the effect of loading frequency and loading speed and wire spiral roll contact state,to test and verify the relationship of metal rubber dampingand the above factors,this article according to the designed to shape the metal rubber specimen considering its structure parameters and the design of static and dynamic loading condition test plan.The experimental results show that the relative density of metal rubber is the main parameter affecting the nonlinear hysteresis characteristic of metal rubber,and the deformation determines the contribution of dry friction damping,and the loading and unloading speed has no significant effect on the hysteresis phenomenon of metal rubber.In the research of metal rubber,cantilever beam model is commonly used for simulation analysis.This model can better reflect the static characteristics of metal rubber,but there are limitations in the description of its internal viscosity.A simulation model was established based on the viscous and hyperelastic properties of metal rubber,which can well describe the nonlinear hysteretic properties of metal rubber.The simulation results are compared with the experimental results to verify the applicability of the model.