Preparation Of Magnetorheological Elastomers And Fatigue Fracture Mechanism

In order to solve the problem of vibration,noise and other issues in engineering,the viscoelasticity of polymers is used to absorb vibration and noise reduction.Due to polymer by alternating stress,causes between molecular chains sliding between molecular chains and packing.With the effect of energy dissipation,people use this property of polymers to achieve the purpose of vibration reduction and noise reduction.Magnetorheological elastomer is a new type of material,and its innovation lies in transforming vibration reduction and noise reduction from past passive behavior to active behavior,thus realizing intelligent control of materials.As we all know,more than 80% of the destruction of engineering components is due to fatigue failure,due to the magnetic particles of magnetic rheological elastomers don’t have the reinforcing properties of carbon black,silica,such a large number of magnetic particles will inevitably affect the fatigue life.Magnetorheological elastomers are usually used under cyclical and complex stress conditions.On the basis of ensuring the rheological effects of magnetorheological elastomers,the fatigue fracture properties of magneto-rheological elastomers often determine the service life of materials,in order to ensure the safety and reliability of elastomers,the study of the fatigue characteristics of magnetorheological elastomers and the microscopic mechanism of fatigue fracture have important scientific and engineering significance.In this paper,starting from the processing of materials,the hyperelastic,viscoelastic and fatigue constitutive equations are fitted by the mechanics and fatigue life testing system of magnetorheological elastomers,and the fatigue life of magnetorheological elastomers is systematically analyzed:Firstly,through the analysis of the raw materials of magnetorheological elastomers,the optimal preparation scheme was selected,and the magnetorheological elastomers of different vulcanization systems and rubber matrices were prepared and their magnetorheological effects were tested.Secondly,the plane shear test fixture and fatigue test equipment were set up,and the plane shear and fatigue test methods were designed.The hyperelastic,viscoelastic and fatigue constitutive equations of the magnetorheological elastomer were fitted.Thirdly,the fatigue life of different factors was tested,the constitutive equations of different conditions were constructed,and the analysis was performed from the point of view of the constitutive equation.At the same time,the surface of the material before and after fatigue was analyzed by the modern test technology.The microscopic structure explains the molecular mechanism.Finally,the fatigue test of the magnetorheological rubber parts is compared with the prediction of the constitutive method.There is only 2.35% error between the forecast results and the actual results.,and the result is credible.The current automotive suspension with a better application prospect of magnetorheological elastomer is predicted.This article analyzes the suspension of a domestic SUV.From the perspective of engineering design,the magnetorheological rheology of this magnetorheological elastomer suspension is analyzed.The effect,balance of fatigue life,and the direction of future improvement were proposed.At the same time,from the perspective of scientific research,the direction for the modification of the elastomer matrix and magnetic particles was proposed.