Abstract
This paper presents a new constitutive model of high particles concentrated magnetorheological fluids (MRFs) that is based on the hexagonal close-packed structure, which can reflect the micro-structures of the particles under the magnetic field. Firstly, the particle dynamic simulations for the forces sustained by carbonyl iron powder (CIP) particles of MRFs are performed in order to investigate the particles chain-forming process at different time nodes. Subsequently, according to the force analyses, a hexagonal close-packed structure, which differs from the existing single-chain structure and body-cantered cubic structure, is adopted to formulate a constitutive model of MRFs with high concentration of the magnetic-responsive particles. Several experiments are performed while considering crucial factors that influence on the chain-forming mechanism and, hence, change the field-dependent shear yield stress in order to validate the proposed model. These factors include the magnetic induction intensity, volume fraction and radius of CIP particles, and surfactant coating thickness. It is shown that the proposed modeling approach can predict the field-dependent shear yield stress much better than the single-chain model. In addition, it is identified that the shear yield stress is increased as the particle volume fraction increases and surfactant coating thickness decreases. It is believed that the proposed constitutive model can be effectively used to estimate the field-dependent shear yield stress of MRFs with a high concentration of iron particles.
Highlights
Magnetorheological fluids (MRFs), a new type of intelligent material, is usually composed of base carrier fluid and magnetic particles that are dispersed in the base carrier fluid
It is necessary to analyze the forces on carbonyl iron powder (CIP) particles and its influence factors, and some equations of motion need to be established, to accurately study the microstructure of MRFs
The chain-forming simulation result of CIP particles is conducted via MATLAB to obtain the microstructure and configuration of MRFs
Summary
Magnetorheological fluids (MRFs), a new type of intelligent material, is usually composed of base carrier fluid and magnetic particles that are dispersed in the base carrier fluid. The flow state of MRFs can be rapidly governed by the imposed magnetic field. Some advantages of MRFs, such as easy controllability, quick response, and reversible change, enable it to display its huge potential applications in diverse fields including automotive suspension system [1], self-powered magnetic-field sensor [2], and vibration control structures [3,4]. It is well known that the macroscopic properties of materials are determined by their microstructures. The changes in the microstructure of MRFs will directly affect its macroscopic performance. The flow state of MRFs between two parallel fixed plates under the influence of a constant magnetic field
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
