2004/07/31 by Jiping Huang, J. P. Huang, K. W. Yu
Engineering · Physics and Astronomy · #Seismic Performance and Analysis #Vibration Control and Rheological Fluids #cond-mat.mtrl-sci #cond-mat.soft #physics.chem-ph
paper · pdf · doi:10.1063/1.1798912
published as J. Chem. Phys. 121, 7526 (2004) · 21 pages, 4 figures
openalex publication_date 2004/10/05 · arxiv created 2004/10/06 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We apply a Langevin model to investigate the nonlinear ac responses of electro-magnetorheological (ERMR) fluids under the application of two crossed dc magnetic (z axis) and electric (x axis) fields and a probing ac sinusoidal magnetic field. We focus on the influence of the magnetic fields which can yield nonlinear behaviors inside the system due to the particles with a permanent magnetic dipole moment. Based on a perturbation approach, we extract the harmonics of the magnetic field and orientational magnetization analytically. To this end, we find that the harmonics are sensitive to the degree of anisotropy of the structure as well as the field frequency. Thus, it is possible to real-time-monitor the structure transformation of ERMR fluids by detecting the nonlinear ac responses.