摘要
简述了一种磁流变弹性体(MRE)剪切性能的动态测试装置,其主要结构是由一块磁流变弹性体和一个质量块组成的单自由度振动系统。在磁场作用下,磁流变弹性体的力学性能发生相应的改变。通过该装置测出有场下的MRE受剪切激励后的自由衰减特性,并建立理论模型,从而间接得到剪切模量G(BMRE)和材料损耗因子βm(BMRE)。这样的处理方法使得实验条件得到简化且不依赖于初始激励状态。所得到的剪切模量的变化性能与文献中报道的一致(在没有达到磁饱和的条件下,剪切模量随外加磁场的变化而改变),但剪切模量的改变量是零场下剪切模量的60%,磁控性能也有所提高,并得到了材料损耗因子。
In this paper, we present a dynamic experimental device to investigate the shear property of MRE, which belongs to the magnetorheological family. The device contains a single degree of freedom vibration system which are made up of a piece of MRE and a mass. Under the action of the applied magnetic field, the damped free vibration of the MRE whose shear vibration is excited is then tested by this device, which forms the basis for a theoretical model. Through the experiment, the relationship between the shear modulus G(B_(MRE))?the loss factor β_m(B_(MRE))of MRE and the applied magnetic field was also given. This technique avoids utilizing complex equipment to obtain (G(B_(MRE))) and β_m(B_(MRE)). The experiment results shows the same basic features of those reported in the current literature (when the applied field was moderate and the saturation did not happen,the shear modulus increased proportionally with the applied magnetic field) and reveal that the MRE cured by our group has a better field-control performance compared to those reported elsewhere and that the maximum shear modulus G(B_(MRE)) governed by the magnetic field can change about 60% of that of zero-field. Properties controlled by magnetic field can also be improved and the damping factor can be obtained.
出处
《实验力学》
CSCD
北大核心
2004年第1期1-5,共5页
Journal of Experimental Mechanics
基金
国家自然科学基金资助项目(No.19834020)
安徽省十五科技攻关项目
