Micro-phenomenon and viscosity features of magnetorheological fluids at external field

作     者：CHENG Haobo, SUN Guozheng, FENG Zhijing, WANG Yongtian Dept. of Optical Engineering, Beijing Institute of Technology, Beijing, China, 100081 Dept. of Precision Instruments and Mechanology, Tsinghua University, Beijing, China, 100084 CHINA NORTH Industries Group Corporation, Beijing, China, 100089 

会议名称：《2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies》

会议日期：2005年

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

关 键 词：Magnetorheological Finishing Magnetic Particles Viscosity 

摘      要：Magnetorheological finishing (MRF) is a technique in which a magnetic-field stiffened ribbon of MR fluid is used to polish a workpiece. MR fluids are essentially suspensions of magnetizable particles immersed in a nonmagnetic fluid. These complex fluids show a unique ability to undergo rapid, nearly completely reversible, significant changes in their mechanical and optical properties upon application of an external magnetic field. The aim of this work is essentially to investigate the effect of microstructure and viscosity behavior of magnetorheological suspensions under the external electro-magnetic field. A viscometer equipped with a circular shape electro-magnetic coil around the testing tube is used. The viscosity of the MR fluids is experimentally studied with the change of the magnetic density. The microstructure and behavior of bending chains in MR fluids are observed by applying an electro-magnetic field,