Constitutive Model Of Electrorheological Elastomers And Seismic Performance Of EREs-based Variable Stiffness Viscoelastic Damper

Electrorheological elastomers?ERE?have the characteristics of real-time,reversible and rapid adjustment under the electric field strength.It has a broad application prospect in the field of structural vibration control as a kind of smart material with variable stiffness.However,the stiffness of a conventional viscoelastic damper cannot be changed in accordance with conditions such as external environmental factors.Therefore,in order to make the traditional viscoelastic damper intelligent,ERE is used in place of traditional rubber materials to make variable-viscosity viscoelastic dampers that can be adjusted by electric field.The performance of variable-stiffness viscoelastic dampers for electrorheological fluids and established the mechanical model based on the force-displacement hysteresis curve research is discussed.?1?Preparation of TiO₂/urea core-shell nanoparticles and preparation based on the electrorheological elastomer on the particles.The dynamic properties of the electrorheological elastomer were tested from the three aspects of shear frequency,shear strain amplitude and electric field strength.The analysis results show that the electrorheological elastomer has good viscoelastic properties and variable stiffness properties under different working conditions.?2?Based on the above test results for the dynamic viscoelastic properties of the electrorheological elastomer,a constitutive model of the electrorheological elastomer material was established,and the model parameters were identified using Matlab software simulation and the modified Bouc-Wen constitutive model was analyzed.Correlation of parameters and electric field strength.The results show that the modified Bouc-Wen constitutive model can accurately describe the mechanical properties of electrorheological elastomer under various working conditions.?3?Proposing an electrorheological elastomer as the core energy-consuming element of a variable-rate viscoelastic damper and combining it with a traditional viscoelastic damper,designed a variable-rate viscoelastic damper based on an electrorheological elastomer.A sinusoidal shear test was performed on the hysteresis curve of the damper,the equivalent stiffness,the equivalent damping,and the energy dissipation performance were analyzed from the electric field strength,the shear frequency and the shear displacement amplitude.The analysis of the test data shows that the damper has good viscoelasticity,stiffness adjustability and energy dissipation performance,which shows that the design of the electrorheological elastomer variable stiffness viscoelastic damper is feasible as a vibration damping device.?4?Combining the constitutive model of the electrorheological elastomer material and the hysteretic curve with the strain-stiffening characteristic of the variable stiffness viscoelastic damper,the mechanical model of the variable stiffness viscoelastic damper is established.The hysteresis curve of the mechanical model and the test data is compared by identifying the parameters in the model.The results show that the proposed mechanical model of damper has a very high accuracy,and the dependence of various parameters of the model on the electric field strength and the shearing frequency is analyzed,and the relation formulae of each parameter are summarized.