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Application of Magnetorheological Elastomer in Automobile Industry

责编: | 发布日期:2016-12-16| 阅读次数:
类别    学术报告
发布单位    材料科学与工程学院
报告(活动)名称    Application of Magnetorheological Elastomer in Automobile Industry  
报名时间     2016/12/16 9:19:37 至2016/12/16 23:19:38
报告(活动)时间    2016/12/17 9:30:45 至2016/12/17 11:30:50  
报告(活动)地点    逸夫会议中心-中心会议室
报告(活动)人数    100
报告(活动)内容    Rubber vibration isolators (RVIs) are used in multiple utilities and play very important roles in the automobile industry. Since these conventional RVIs can only absorb a restricted range of frequency because of their inherent modulus, the efficient control of variably generated vibrations is difficult. For that reason, a number of research projects on the efficient control of variably generated vibrations have been carried out, including the use of magneto-rheological elastomer (MRE). MRE is a smart material where magnetizable particles are distributed in an elastomeric matrix. The particles inside the elastomer can be homogeneously distributed or they can be formed into a chain like columnar structure. The former is called an isotropic MRE (i-MRE) and the latter an anisotropic MRE (a-MRE). The field responsiveness of the viscoelastic properties of these elastomers has been a subject of studies only recently. The mechanical and rheological properties of an elastomeric material containing magnetizable particles can be reversibly changed by applying an external magnetic field. This is called the MR effect. The origin of the field dependence of the MRE properties is the existence of field-induced dipole magnetic forces between the particles. Therefore, the mechanical behavior of MRE is a combination of the matrix properties and the properties of magnetizable particle formations inside the matrix. If the particles are ferromagnetic and have a net moment, the formation of columnar particle structures within the elastomer corresponds to a low dipolar energy state. The shearing of a cured composite in the presence of a field causes particle displacement from this low energy state, which thereby requires additional work. In principle, this additional work required increases monotonically with the applied field, resulting in a field dependent shear modulus. In this study, a new kind of MREs was designed using carbonyl iron particles (CIPs), carbon black and various elastomers such as NR, self-crosslinking CR/ENR blend, EPDM and AEM. The interaction mechanism among CIPs, CB and a matrix in the fabrication process was discussed in detail. The morphology of i-MRE and a-MRE was observed by SEM. The effect of CIP volume content on the mechanical properties of MREs was investigated. The effect of CIP volume content on the shear storage modulus, MR effect and loss factor was studied using a modified DMA. The results revealed that the chain-like distribution of CIPs became more pronounced with increasing CIP content in a-MREs, whereas CIPs distributed uniformly in i-MREs. Finally, the new type of suspension bush consisted of MRE and engineering plastic will be compared with the conventional suspension bush in automobile. Throughout this study, it is expected that the smart suspension bush which can improve the damping performance and light weight can be developed.