Faculty Publications

Permanent URI for this communityhttps://idr.nitk.ac.in/handle/123456789/18736

Publications by NITK Faculty

Browse

Subject: search.filters.subject.Magnetos

Search Results

Now showing 1 - 4 of 4
  • No Thumbnail Available
    Item
    Effect of Magnetic Field on Corrosion Performance of Ni–Co Alloy Coatings
    (Springer Science and Business Media Deutschland GmbH, 2023) Shetty, A.R.; Hegde, A.C.
    The corrosion protection efficacy of Ni–Co alloy coatings was tried to improve by magnetoelectrodeposition (MED) approach. The magnetic field of varying strength (B) was applied in perpendicular and parallel to the direction of diffusion of metal ions, simultaneously to the process of deposition. The corrosion behaviour of the deposited coatings was studied through electrochemical DC method and results revealed that Magneto-electrodeposited (MED) Ni–Co alloys coatings were found to be more corrosion resistant than their conventionally electrodeposited (ED) counterparts. Moreover, the effect of magnetic field is more pronounced in perpendicular field direction and was explained by Lorentz force. Under optimal condition, MED Ni–Co alloy coating obtained at a magnetic field intensity of B = 0.3 T (Perpendicular) was found to be less prone to corrosion than its ED alloy (B = 0 T) counterpart. The increased limiting current density (iL) of Co2+ ions in turn increases the corrosion resistant properties of MED Ni–Co alloy coatings. The effect of magnetic field on improved corrosion resistance of the deposited coatings have been investigated in terms of their changed surface morphology, composition, phase structure and surface roughness using Scanning electron microscopy (SEM), Energy dispersion spectroscopy (EDS), X-Ray diffraction (XRD) technique and Atomic Force Microscopy (AFM) respectively. © 2022, The Author(s).
  • No Thumbnail Available
    Item
    Magnetic field-induced codeposition of (Ni–Co) alloy coatings for better corrosion protection
    (SAGE Publications Ltd, 2025) Yathish Rai, T.; Hegde, A.
    This paper explores the benefit of induced magnetic field (B) in the co-deposition of (Ni–Co) alloy coatings for better corrosion protection. The phenomenon of magnetohydrodynamic (MHD) convection has been used as the tool to deposit (Ni–Co) alloy coatings of high corrosion protection from an electrolytic bath having low [Co+2] ions. Experimental studies demonstrated that under optimal conditions of magnetic field intensity (B), magneto-electrodeposited (MED) coatings, developed under parallel (
  • No Thumbnail Available
    Item
    Experimental investigation of rotor wound multi disc magneto-rheological fluid brake
    (SAGE Publications Ltd, 2025) Bhat, S.H.; A, A.; Naveen, S.; Kumar, H.; M, A.
    Magneto-Rheological fluid (MRF), known for changing properties under a magnetic field, is ideal for brakes and dampers in magnetically controlled devices. This research presents a novel design for a 10-disc MR brake using in-house Magneto-Rheological Fluid (MRF), distinguished by its integration of electromagnet windings directly onto the brake shaft. Magneto-static analysis, performed using Finite Element Method Magnetics (FEMM) software, optimized the material selection and dimensions, enhancing the magnetic field distribution across the MRF gap and maximizing braking torque. The design, with rotor windings and a consistent MRF gap, generates a uniform magnetic field, significantly boosting performance. Theoretical braking torque was estimated using Bingham plastic model for MRF characterization, aligning well with experimental results. The compact 10-disc MR brake design, weighing 1.19 kg, shows robust torque performance across varying current levels. Remarkably, prior research had not integrated electromagnet windings directly on the rotor of MR brake, marking this study as pioneering in advancing MR brake performance. © The Author(s) 2025.
  • No Thumbnail Available
    Item
    Design and Development of Internal Wound Magnetorheological Elastomer Mount for Structural Vibration Isolation
    (Springer, 2025) Bhat, S.H.; Saroj, A.A.; Kumar, H.; Arun, M.; Vaidyanathan, R.V.
    Vibration isolation of structures is crucial for enhancing reliability when subjected to mechanical vibrations and shocks. This research investigates the application of Magneto-Rheological Elastomer (MRE) mounts to mitigate vibrations in a 15 kg structure. A unique MRE mount with internal windings was designed and developed using magneto-static analysis with maximizing magnetic flux density across MRE through the Design of Experiments (DoE). MRE samples were prepared considering 20, 40 and 60% (wt.) carbonyl iron particle (CIP) content within a silicon elastomer matrix and analyzed under a rheometer. Further, these MRE samples were considered for forced vibration studies with structures placed on MRE mounts across different frequencies. Repeated experiments with all in-house MRE samples demonstrated that the MRE mount significantly mitigated vibrations at different currents and compositions. The transmissibility plot revealed a maximum amplitude reduction of 3.73 times for the 60% MRE sample. These results underscore the importance of optimizing MRE mount and CIP content for effective vibration isolation, which is vital for prolonging the operational lifespan of critical structures. © The Institution of Engineers (India) 2025.