【摘要】 磁流变液优异的力学性能与高效的可控性能使其成为具有广阔应用前景的一类新型智能材料。针对磁流变液宏观力学性能与其微观结构行为的密切相关性,本工作采用分子动力学仿真软件LAMMPS开展了不同磁场强度和颗粒体积率下磁流变液的微观结构演化模拟,并在此基础上分析了磁流变液的宏观力学性能;进而通过对不同磁场强度、不同颗粒体积率和不同剪应变下磁流变液模拟微观结构的定性观察与定量分析,深入剖析了磁流变液微观结构的演化规律与链簇倾角的统计特性。本工作为进一步揭示磁流变液微观机理与宏观力学性能相关性、开展磁流变液材料及其组成构件的设计优化提供关键理论基础。更多还原

【Abstract】 Magnetorheological(MR) fluids have been regarded as a promising intelligent material with wide application prospect due to their excellent mechanical property and efficient controllability. The bulk rheology of MR fluids is closely related to their microstructures. In this context, LAMMPS is used to investigate the microstructural evolution of MR suspensions with different volume fractions under different magnetic fields, based on which the macro mechanical property of MR suspensions was analyzed. Then qualitative observation and quantitative analysis were conducted on the microstructures of MR suspensions with different simulation parameters(volume fraction, magnetic fields and shear strain). The associated mechanism was revealed and the statistical property of chain dip angles was addressed. This research has provided a theoretical basis for further revealing the correlation of microstructural evolution and macro mechanical property of MR fluids as well as designing and optimizing MR fluid materials and devices.更多还原