A shear stress model of water-based magnetorheological polishing fluids

Abstract

Magnetorheological polishing fluid (MRPF) with excellent rheological characteristics are efficient in material removal of workpiece. Shear stress is an important evaluation index of rheological characteristics, and is also an important research field of MRPF. In this study, a new shear stress model of MRPF is proposed, which is based on the application of Coulomb’s law in magnetic field. The interaction between magnetic particles on different magnetic chains and the effects of abrasive particles are considered in this model. The proposed model assumes that magnetic particles of MRPF slide in horizontal direction with shear behavior, and the exponential function is introduced to explain the relationship between the number of particles sliding and shear rate. Furthermore, the relationship between shear stress and shear rate is obtained by mathematical method. Compared with experimental data, theoretical model can effectively explain the variation of shear stress with shear rate. The correctness of the particle slip hypothesis has been verified by finite element method.

Investigation on rheological characteristics of magnetorheological shear thickening fluids mixed with micro CBN abrasive particles

“…The rheological characteristics was different from that of traditional magnetorheological polishing fluids. The traditional magnetorheological polishing fluids usually exhibited that the shear stress slowly varied with the increase of shear rate liking a horizontal line [53,54]. This special shear stress behavior of MRSTPFs contributed to improving material removal rate and polishing efficiency.…”

Progress in the study of electrorheological polishing: A review

“…Magnetic field-assisted polishing must require its polishing fluid composition to contain ferromagnetic particles. Carbonyl iron powders is a common polishing fluid component of magnetic field-assisted polishing (Gorodkin and Novikova, 2012; Ma et al, 2022; Peng et al, 2021; Xiu et al, 2018; Yang et al, 2018). However, carbonyl iron powders’ improper storage can easily cause a very dangerous explosion.…”

A particle-level discrete element model for simulating the performance of MRFs

“…Among these uses, research has concentrated on the rheological and mechanical properties of MRF (Bai et al, 2018;Milecki et al, 2012;Omidbeygi and Hashemabadi, 2013;Sharipov et al, 2018;Zapomel et al, 2017). The macroscopic characteristics of MRFs are widely known to be dependent on the internal particle-formed microstructures (Ji et al, 2019;Ma et al, 2022;Wang et al, 2019;Zubarev et al, 2020); however, when examining macroscopic performance, the changes, and impacts of its microstructure are typically overlooked. So far, some experimental studies have been performed to observe the micro-structured behaviors of particles in the MRFs (Baghel and Kumar, 2021;Sarkar and Hirani, 2015;Zablotsky et al, 2020).…”