Wear and Friction Characteristics of Magnetorheological Fluid under Magnetic Field Activation

Song, Wanli; Choi, Seung‐Bok; Choi, Jae-Young; Lee, Chulhee

doi:10.1080/10402004.2011.584365

Cited by 44 publications

(25 citation statements)

References 13 publications

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“…In that sense, we understand that the fact that triggers the decrease of the wear scar dimensions, in the case of MR fluid lubrication in the presence of magnetic fields, is the magnetic field gradient, which promotes particle agglomeration in a given region of the space around the magnets. This produces a confinement of the abrasion region to a small zone, which is in agreement with previous reports (Song et al, 2011;Hu et al, 2012). Furthermore, the negligible magnetic field effect for the larger particles can be associated to the resultant film thickness formed for glycerol 88% that, in our predictions, is lower than those particle sizes.…”

Section: Wear Scar and Roughness Analysis: Fixed Sliding Speedsupporting

confidence: 93%

Tribological Behavior of Glycerol/Water-Based Magnetorheological Fluids in PMMA Point Contacts

2019

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Comprehension of the tribological behavior of magnetorheological fluids is crucial for many applications, in particular for those related with high quality surface finishing. In this contribution, we describe a thorough experimental investigation on the tribological properties of magnetorheological (MR) fluids in poly(methyl methacrylate) (PMMA) point contacts. First, magnetic iron oxide particles with diameters of ∼0.4, 1,3, and 2.0 µm were prepared using wet chemistry procedures. Then, MR fluids were formulated by dispersion of the magnetic particles in glycerol/water mixtures. The tribological experiments were run in a PMMA ball-on-three plates tribometer and Stribeck regions were identified for a wide range of sliding speeds. The wear tracks were also visualized in a confocal microscope to correlate them with friction coefficient data. The results show the effect of both particle size and applied magnetic field in the friction coefficient and wear scar volume, suggesting a slight decrease on the wear process when the magnetic field is present.

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Section: Wear Scar and Roughness Analysis: Fixed Sliding Speedsupporting

confidence: 93%

Tribological Behavior of Glycerol/Water-Based Magnetorheological Fluids in PMMA Point Contacts

2019

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“…기존 연구에서 는 자기유변유체의 트라이볼로지 특성을 연마공정에 적용하였으며, 실험결과를 통해 연마공정에서의 지배 적 마모 메커니즘에 따라 마모가 발생하는 것을 확인 하였다 [8]. 또한 포볼(four-ball) 마찰시험기를 이용하여 자기장을 인가할 때에 자기유변유체의 마찰 및 마모 특성을 연구하였다 [9][10]. 표면 처리 기술 분야에서 표 면 코팅 기술은 마모 성능을 향상시키는 역할을 하므 로 다양한 산업 분야에서 광범위하게 응용되고 있다.…”

Section: 서 론 자기유변유체(Magnetorheological Fluids)는 기계적인 성질을 제어할 수 있는 유체이unclassified

Friction and Wear Characteristics of Magneto-rheological Fluid Depend on Surface Coated by DLC and PTFE

Zhang¹,

Lee²,

Lee

et al. 2015

Journal of the Korean Society of Tribologists and Lubrication E

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− A magnetorheological (MR) fluid is a smart material whose rheological behavior can be controlled by varying the parameters of the applied magnetic field. Because the damping force and shear force of an MR fluid can be controlled using a magnetic field, it is widely employed in many industrial applications, such as in vehicle vibration control, powertrains, high-precision grinding processes, valves, and seals. However, the characteristics of friction caused by iron particles inside the MR fluid need to be understood and improved so that it can be used in practical applications. Surface process technologies such as polytetrafluoroethylene (PTFE) coatings and diamond-like carbon (DLC) coatings are widely used to improve the surface friction properties. This study examines the friction characteristics of an MR fluid with different surface process technologies such as PTFE coatings and DLC coatings, by using a reciprocating friction tester. The coefficients of friction are in the following descending order: MR fluid without any coating, MR fluid with a DLC coating, and MR fluid with a PTFE coating. Scanning electron microscopy is used to observe the worn surfaces before and after the experiment. In addition, energy dispersive X-ray spectroscopy is used to analyze the chemical composition of the worn surface. Through a comparison of the results, the friction characteristics of the MR fluid based on the different coating technologies are analyzed.

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“…자기유변유체(magnetorheological fluids)는 자기장 의 유무와 자기장의 세기로 기계적인 성질을 제어할 수 있는 유체이다 [1,2]. 자기장이 자기유변유체에 가 해지게 되면 유체 내부의 철 입자가 자기장 방향에 따라 사슬 모양을 형성함에 따라 강성 및 댐핑 특성 이 변하게 된다.…”

Section: 서 론unclassified

A Study on the Effect of the Material and Applied Magnetic Field Strength on the Friction Characteristics of Magnetorheological Fluids

Zhang¹,

Lee²,

Lee³

2013

Journal of the Korean Society of Tribologists and Lubrication E

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− Magnetorheological (MR) fluid belongs to the group of smart materials. In MR fluid, iron particles in base oil form chains in the direction of the applied magnetic field, thus resulting in a variation in the stiffness and damping characteristics of the fluid. Research is being carried out on controlling the stiffness and damping characteristics as well as the tribological characteristics of the MR fluid. In this study, the friction characteristics of MR fluid have been evaluated using three types of materials and magnetic fields of different strengths. The coefficients of friction of the three types of MR fluid are measured, and the relationship between the coefficient of friction and the strength of the applied magnetic field is obtained.

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Wear and Friction Characteristics of Magnetorheological Fluid under Magnetic Field Activation

Cited by 44 publications

References 13 publications

Tribological Behavior of Glycerol/Water-Based Magnetorheological Fluids in PMMA Point Contacts

Tribological Behavior of Glycerol/Water-Based Magnetorheological Fluids in PMMA Point Contacts

Friction and Wear Characteristics of Magneto-rheological Fluid Depend on Surface Coated by DLC and PTFE

A Study on the Effect of the Material and Applied Magnetic Field Strength on the Friction Characteristics of Magnetorheological Fluids

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