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Magnetic-field-tuned Insulator to Conductor Transition in Magnetorheological Suspension
Xiongbo Yang,Yuhuan Jiang,Yuehua Huang,Ruizhen Xu,Hongguang Piao,Gaomeng Jia,Xinyu Tan 한국자기학회 2014 Journal of Magnetics Vol.19 No.4
Magnetorheological suspensions (MRSs) are smart materials that have the potential to revolutionize several industrial sectors because of their special rheological behaviors. In this paper, MRS, based on carbonyl iron (CI) microparticles that were dispersed in silicone oil with oleic acid, were prepared. We showed that the electroconductibility of MRS was significantly influenced by the intensity of the external magnetic field that was applied. The resistance value can vary from infinite to below 300 Ω after applying an external magnetic field. The results indicated that this MRS had the property of magnetic-field-tuned insulator to conductor transition. This system has potential applications in controllable MRS electrical devices.
Vibro-acoustic design of plate using bi-material microstructural topology optimization
Jianbin Du,Ruizhen Yang 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.4
This study presents a microstructural topology optimization-based method for dealing with the problem of minimizing the soundpower flow that radiates from a vibrating composite plate. The plate is assumed to be constructed with periodic microstructures that areuniformly distributed over the macrostructural domain. The design variable in this case is the relative material volume density of the unitcell of the microstructure. The equivalent macromaterial properties of the microstructure are calculated using the homogenization method,and the bi-material solid isotropic material with penalization model is employed to achieve a zero-one design at a microscale. The highfrequency approximation formulation and the weak coupling assumption are adopted to achieve an efficient overall analysis and sensitivityanalysis of the coupling system. The proposed method is validated by several numerical examples. Results show that effective vibroacousticisolation may be implemented by the topology design of periodical microstructures.
Influence of Oleic and Lauric Acid on the Stability of Magnetorheological Fluids
Yuehua Huang,Yuhuan Jiang,Xiongbo Yang,Ruizhen Xu 한국자기학회 2015 Journal of Magnetics Vol.20 No.3
In this paper, magnetorheological fluids (MRFs) based on micro-sized iron particles dispersed in silicone oil are presented. The iron particles are modified by adding different ratios of oleic acid and lauric acid as surfactants to the suspensions. Lauric acid was found to reduce the stability of the MRFs, and more lauric acid results in a higher rate of sedimentation. Further study showed that the formation and structure of lauric acid may result in the sedimentation of micrometer-sized particles. Meanwhile, the electro-resistance of MRF in this paper shows a decrease from beyond 6000 MΩ to 190 Ω with an increase in the external field from 0 mT to 400 mT.