Tribological Properties of a Magnetorheological (MR) Fluid in a Finishing Process

• Published in: Tribology transactions Vol. 52; no. 4; pp. 460 - 469
• Main Authors: Seok, Jongwon, Lee, Seong Oh, Jang, Kyung-In, Min, Byung-Kwon, Lee, Sang Jo
• Format: Journal Article
• Language: English
• Published: Philadelphia, PA Taylor & Francis Group 01.07.2009; Taylor & Francis; Taylor & Francis Inc
• Subjects: Applied sciences; Exact sciences and technology; Finishing; Finishing Process; Fluid dynamics; Friction, wear, lubrication; Machine components; Magnetorheological Fluid; Material Removal Rate Model; Materials science; Mechanical engineering. Machine design; Non-Prestonian Wear Behavior; Physical properties; Preston Equation; Rheology; Tribology; Wear resistance; Water; Material Removal Rate Model; Speed; Finishing Process; Iron; Magnetic fluid; Surfactant; Experimental study; Empirical model; Modeling; Non-Prestonian Wear Behavior; Magnetorheological fluid; Friction; Wear rate; Wear; Friction coefficient; Preston Equation; Finishing; Erosion; Tribology
• ISSN: 1040-2004; 1547-397X
• DOI: 10.1080/10402000802687932

This article examines the tribological properties of a magnetorheological (MR) fluid in a finishing process. The MR fluid under investigation contains about 85 wt% of micro-sized carbonyl iron (CI) particles and about 15 wt% of water and surfactant(s) compound. A semi-empirical material removal model is proposed for the description of the tribological behavior of the MR fluid in the finishing process by considering both the solid- and fluid-like characteristics of the fluid in a magnetic field. Additionally, Archard's theory and Amonton's law of friction are applied to the model, which is completed by experimental efforts to identify the relationship between the effective friction coefficient and the ratio of the interfacial particle velocity to the imposed pressure on the workpiece surface. It turns out that the effective friction coefficient has a linear relationship with this ratio. The validity of the proposed model is supported through material removal rate measurements. It is also shown that the proposed model is substantially different from the conventional Preston equation in that the material removal rate is not only a function of the product of the applied normal pressure and relative velocity, but it also strongly depends on the square of the relative velocity.