Aggregated chain morphological variation analysis of magnetorheological fluid (MRF) in squeeze mode

Magnetorheological fluid is a novel functional material, of which quasistatic squeeze behavior needs to be quantitatively controlled in industrial applications. Since the quasistatic squeeze behavior has a close relation with microstructure variations, thus it is modeled from a microscopic approach. By analyzing compression of single chains, aggregation from single chains to BCT structure and compression of BCT structure, the initial stress [Formula: see text], yield stress [Formula: see text], yield strain [Formula: see text], and stress in post-yield stage [Formula: see text] are respectively modeled. It is found that they have an exponential dependence on magnetic field strength H and particle volume concentration [Formula: see text], including [Formula: see text], [Formula: see text], and [Formula: see text], etc. By comparing predicted results with measured results, the micro-macro stress model on quasistatic squeeze behavior is well validated. This model can be used to design, manufacture, and control industrial magnetorheological devices.

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“…When single chain deforms, the dipole forces among particles result in a restoring effect to hinder the deformation (Wang et al, 2019).…”

Section: Microstructure Feature Parameter Analysis and Macroscopic Features Modelingmentioning

confidence: 99%

“…t -axis points to the tangential direction which can rotate clockwise by 90 ° to r -axis. The magnetic force F i , i + 1 m of particle i + 1 on particle i can be expressed as (Wang et al, 2019),…”

Section: Microstructure Feature Parameter Analysis and Macroscopic Features Modelingmentioning

confidence: 99%

Analysis of quasistatic squeeze behavior of magnetorheological fluid from the microstructure variations

Luo

Wang

Liu

et al. 2021

Journal of Intelligent Material Systems and Structures

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“…Numerous studies have been conducted on the mutual motion of magnetic particles in static flows under the action of a uniform magnetic field. However, most studies are based on the magnetic dipole theory [16][17][18][19][20] and Stokes' drag law [21][22][23]. Wu et al [24] studied the chain-forming mechanism of magnetic particles in magnetorheological elastomer prestructures based on the magnetic dipole theory and Stokes resistance law, but they studied the interaction between particles through the dipole model and ignored the hydrodynamic and magnetic effects of interactions among particles of finite size.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of effectively driving the trajectory of magnetic particles in a Newtonian fluid using a uniform magnetic field

Chen²,

Bo³

et al. 2022

J. Phys. D: Appl. Phys.

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Herein, the interaction and relative motion of two circular magnetic particles in a static flow and planar Poiseuille flow is investigated via numerical simulation. A two-dimensional numerical model is constructed based on Maxwell’s finite element method, fully considering the interactions between particles and particles, particles and magnetic fields, and particles and flow fields. First, the motion state and action mechanism of the magnetic particles in contact state in the static fluid are analyzed under a vertical magnetic field; then, the simulation results are verified via experiments. Based on the motion state of the magnetic particles in the planar Poiseuille flow, the feasibility of effectively controlling the trajectory of magnetic particles in the planar Poiseuille flow using a magnetic field is discussed. In the static flow, the vertical magnetic field was unable to separate the contacting magnetic particles; thus, the magnetic field cannot effectively control magnetic particles in static flows. In the planar Poiseuille flow, the free contact and separation of magnetic particles was effectively controlled by the combined action of the magnetic field and the fluid. This study provides insights into the interactions among magnetic particles in static flows and summarizes a set of methods for effectively controlling two circular magnetic particles.

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“…In order to save energy, protect the marine environment from pollution and ensure the safety of human life and property, it is urgent to study the safety protection of large transport vessels. The advantages of water transportation are obvious [1][2][3][4][5][6][7]. First of all, the shipping cost is lower [8][9][10], the tonnage of shipping is larger, and the shipping cost and freight rate are lower than that of highway, so it has obvious advantages in bulk cargo transportation; Secondly, ship energy consumption is low [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Study on Fatigue Strength of Main Anti-collision Structure of Main Pier

Wang¹,

Guan

Ge³

2021

E3S Web Conf.

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In order to improve the efficiency of water transport, avoid energy waste and protect the environment of the ocean and river, the protection of large transport vessels is particularly important. With the continuous development of waterway regulation and the continuous improvement of navigation conditions, the number of ships sailing in the Yinzhouhu section is increasing, and the risk of bridges being hit by ships is also gradually increasing. There are two common ways of bridge anti-collision: independent anti-collision system and its own anti-collision system. The former often adopts the form of independent anti-collision pier, which is generally used in the anti-collision area of old bridges, New bridges generally do not use this method, the latter mainly uses the method of improving the structural firmness of piers to achieve anti-collision, which is the most commonly used and more economical anti-collision method at present. In order to select a more reasonable standard of ship impact force and lay out reasonable anti-collision facilities, the anti-collision facilities of left branch main pier (55, 56) and right branch main pier (76, 77) of ZhongKai Yinzhouhu super-large bridge are studied and designed to provide reference for bridge design.

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Aggregated chain morphological variation analysis of magnetorheological fluid (MRF) in squeeze mode

Cited by 12 publications

References 19 publications

Analysis of quasistatic squeeze behavior of magnetorheological fluid from the microstructure variations

Analysis of quasistatic squeeze behavior of magnetorheological fluid from the microstructure variations

Numerical simulation of effectively driving the trajectory of magnetic particles in a Newtonian fluid using a uniform magnetic field

Study on Fatigue Strength of Main Anti-collision Structure of Main Pier

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