Dynamic response of a MRE sandwich structure under a non‑homogenous magnetic feld

Poojary, Umanath R and Hegde, Sriharsha and Kiran, Katari and Gangadharan, K V (2022) Dynamic response of a MRE sandwich structure under a non‑homogenous magnetic feld. Journal of the Korean Physical Society, 79. pp. 864-873. ISSN 0374-4884

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A viscoelastic layer improves the response of a sandwich structure under dynamic loading. Through integration of a magneto�sensitive elastomer core, the adaptability of the structure over a wider frequency can be achieved. The current work focuses on the infuence of a non-homogeneous magnetic feld on a magnetorheological elastomer (MRE)-based sandwich canti�lever beam. The dynamic response of the structure is measured using the impact hammer test as per the ASTM E-756-05 standard. Results revealed that the fundamental natural frequency of the MRE sandwich beam is a function of the intensity and the location of the non-homogenous magnetic feld. The fundamental natural frequency is reduced as the magnitude of the magnetic fux density is increased or the magnetized region is shifted towards the fxed end. This unique response of the MRE sandwich beam under a non-homogenous magnetic feld is an exception to the usual stifness-enhancing behavior of a MRE. To study this disparity, we independently investigated the contributions by the localized stifness enhancement and the defection due to magnetic pull. The efect of the localized overall stifness enhancement on the overall stifness of the sandwich beam is investigated using modal analysis in ANSYS to analyze the variation in the fundamental frequency. The contribution due to magnetic pull is studied by performing an experimental modal analysis on an equivalent ferromagnetic cantilever beam defected under the infuence of a magnetic feld. By comparing the experimental results and the correspond�ing investigation on the infuencing factors, we confrmed that magnetic pull induced under non-homogenous magnetic feld is an important parameter that signifcantly contributes to the dynamic response of a MRE sandwich beam.

Item Type: Article
Uncontrolled Keywords: MRE · Sandwich beam · Natural frequency · Defection of a cantilever beam
Subjects: Engineering > MIT Manipal > Aeronautical and Automobile
Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 03 Mar 2022 06:06
Last Modified: 03 Mar 2022 06:06
URI: http://eprints.manipal.edu/id/eprint/158329

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