Experimental And Mechanical Properties Study On Acrylic Viscoelastic Damper

Elastic vibration-damping technology is an emerging advanced passive control technology in recent years.Among them,viscoelastic dampers have received great attention due to their high energy consumption,reliable performance,low cost and no additional energy.However,due to the research of viscoelastic dampers involved such as polymer materials,viscoelastic mechanics,vibration control and other fields,the interdisciplinary complexity is complicated,which makes the research on the vibration-damping technology of viscoelastic dampers more difficult.Recently,the domestic viscoelastic damping materials are mainly developed and produced in the field of high-frequency vibration control.At the same time,the corresponding viscoelastic dampers have superior energy consumption at low temperatures,while the energy consumption at lower temperatures is poor,which cannot meet the wide temperature range requirements in the service process of the building structure.Therefore,it is urgent to develop high-dissipation viscoelastic materials and devices that can be applied to the field of low-frequency vibration control of shock absorbing structures.Based on the above questions,a high-dissipation acrylate viscoelastic material is developed in this paper with acrylate viscoelastic dampers as the main research line,which further improves the energy dissipation performance of viscoelastic materials.Then a series of mechanical properties tests were carried out on the viscoelastic damper.A mechanical model considering the effects of temperature,frequency and displacement amplitude was established.This article focuses on solving following three problems.First,the glass transition temperature of the viscoelastic material is shifted to a higher temperature as well as the higher damping performance and the more effective damping temperature range.Secondly,the mechanical properties of acrylate viscoelastic dampers under different conditions were systematically studied.Finally,a mechanical model of the equivalent fractional derivative of the internal variable is established to describe the mechanical behavior of the viscoelastic damper and simulate the dynamic characteristics of the viscoelastic damper.The main work and conclusions are as follows:1.In order to improve the glass transition temperature of viscoelastic materials and improve their damping properties under normal temperature conditions,and meet performance requirements of viscoelastic materials used in building structures.The effect of matrix,carbon black filler and damping agent on dynamic mechanical properties of viscoelastic materials were analyzed.According to the characteristics of viscoelastic materials and their damping mechanism,different viscoelastic materials are designed.,The influence of three design parameters on the dynamic mechanical properties of viscoelastic materials was summarized through the comparative analysis of the test results of different colloids.Based on this optimization,the optimal formulation of acrylate viscoelastic material is designed.2.The different viscoelastic materials were processed into dampers.A series of mechanical properties tests were carried out.The test results show that the ambient temperature is the first factor affecting the performance of viscoelastic dampers.The improved acrylate viscoelastic damper has a loss factor of 0.3 at room temperature,showing excellent energy dissipation.3.Based on the principle of temperature-frequency equivalence and the theory of internal variables which can describe the Payne effect,a mechanical model of viscoelastic dampers,the Equivalent Fractional Derivative Model,which can consider the effects of temperature,strain amplitude and frequency at the same time,is proposed by using the fractional derivative standard solid model.The model verification results show that the calculated values are in good agreement with the experimental values.The internal variable equivalent fractional derivative model can well simulate the storage modulus and loss factor of viscoelastic materials under different working conditions,which can meet the practical application requirements.4.The seismic response of the reinforced concrete frame structure model before and after the addition of acrylate viscoelastic damper is compared and analyzed by the finite element software,Sap2000.The analysis results show that the viscoelastic damper has good energy dissipation and shock absorption capability.