摘要
本文对研发的复合橡胶基磁流变弹性体材料(MRE)的动态力学特性进行了研究,通过循环剪切试验测试了其力学性能。设计了三组剪切试验,分别研究应变幅值、加载频率、外加磁场对MRE力学性能的影响,绘制了在不同加载条件下MRE的滞回曲线,根据试验数据计算得到最大阻尼力、等效刚度、储能模量、耗散能、损耗模量和损耗因子。试验结果表明:MRE的耗能能力明显受到幅值和频率的影响,在200%的幅值和2.0 Hz的加载频率以内,其耗能能力与幅值和频率呈正相关,且其耗能能力受幅值影响比受频率影响更大;外加磁场也能提升MRE的耗能能力,但在50 mT以上的磁场强度下,此MRE性能的提升趋势明显减弱。最后采用Bouc-Wen模型对MRE的动态力学特性进行描述,通过Simulink自带最小二乘算法进行参数拟合,对拟合结果的分析表明,最大阻尼力与耗散能的最大拟合误差在10%以内,平均误差低于5%。
In this paper,the dynamic mechanical properties of the developed composite rubber-based magnetorheological elastomer materials were studied,and their mechanical properties were tested by cyclic shear test.Three groups of shear experiments were designed.The effects of strain amplitude,loading frequency and external magnetic field on the mechanical properties of MRE were studied respectively.The hysteresis curves of MRE under different loading conditions were drawn.According to the experimental data,the maximum damping force,equivalent stiffness,storage modulus,dissipation energy,loss modulus and loss factor were calculated.The experimental results show that the energy dissipation capacity of MRE is significantly affected by amplitude and frequency.Within 200%amplitude and 2.0 Hz loading frequency,its energy dissipation capacity is positively correlated with amplitude and frequency range,and its energy dissipation capacity is more affected by amplitude than by frequency.The external magnetic field can also improve the energy dissipation capacity of MRE,but at the magnetic field intensity above 50 mT,the improvement trend of this MRE performance is significantly weakened.Finally,the Bouc-Wen model is used to describe the dynamic mechanical properties of MRE,and the parameters are fitted by the least squares algorithm with Simulink.The analysis of the fitting results shows that the maximum fitting error between the maximum damping force and the dissipation energy is less than 10%,and the average error is less than 5%.
作者
马乾瑛
李帅
高晓敏
吴宗欢
MA Qianying;LI Shuai;GAO Xiaomin;WU Zonghuan(School of Architecture and Engineering,Chang’an University,Xi’an 710061,China)
出处
《复合材料科学与工程》
CAS
北大核心
2023年第9期5-12,20,共9页
Composites Science and Engineering
基金
国家自然科学基金(51208041)
陕西省自然科学基金(2020SF-382,2014JM2-5080)。
