Open Access

ARTICLE

An Enhanced Dipole Model Based Micro-Macro Description for Constitutive Behavior of MRFs

by Chunwei Zhao¹, Xianghe Peng¹, Jin Huang⁴, Ning Hu¹

1 Department of Engineering Mechanics, Chongqing University, Chongqing, China
2 State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, China
3 Corresponding author: Xianghe Peng, Email address: xhpeng@cqu.edu.cn
4 Chongqing Institute of Automobile, Chongqing University of Technology, Chongqing, China
5 Department of Mechanical Engineering, Chiba University, Chiba, Japan
6 Corresponding author: Ning Hu, E-mail address: huning@faculty.chiba-u.jp

Computers, Materials & Continua 2012, 30(3), 219-236. https://doi.org/10.3970/cmc.2012.030.219

Abstract

The validity of the two conventional micro-macro descriptions for MRFs, based respectively on the exact dipole model and the simplified dipole model, is examined with the results obtained with the commercially available finite element (FE) code ANSYS. It is found that although the simplified dipole model can match better the result by FE computation, there is still a marked difference. An enhanced dipole model is then suggested, which takes into account the contribution of the magnetized particles to magnetic field. Making use of a statistical approach and neglecting the interaction between particle chains, a micro-macro approach is developed for the evaluation of the yield shear stress of MRFs. It can take into account the effects of all the main influencing factors, and can well replicate the main characteristics of the constitutive behavior of MRFs. The method and the results presented are significant for the analysis and optimization of the mechanical properties of MRFs, and for the design of high-performance MRFs.

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