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Rheological Characterization and Performance Evaluation of Magnetorheological Finishing Fluid
Keywords: Magnetorheological finishing fluid, magnetic field strength, yield stress, constitutive models, surface roughness
Novel controllable behaviour of Magnetorheological (MR) fluids are the backbone of magnetorheological fluid-based finishing processes. MR fluid-based finishing processes possess better control over finishing forces as the stiffness of MR finishing fluid used in these processes can be controlled in accordance with the applied magnetic field and MR finishing fluid composition. Therefore, a detailed experimental investigation is carried out to find the effect of MR finishing fluid constituents on its yield shear stress through Taguchi Design of Experiments. Rheological data obtained from magneto-rheometer (MCR-102) is characterised using Bingham plastic, Herschel–Bulkley and Casson’s fluid constitutive modelling. Coefficient of regression (R2) values of Herschel–Bulkley model is found to be best suited for all compositions of MR finishing fluid. Analysis of Variance (ANOVA) is used to find the contribution of selected parameters improving response characteristics. The optimized fluid is then used for the finishing of biocompatible stainless steel AISI 316L and the finishing results show that the average surface roughness value decreases down to 58 nm.