International Journal of Physics | Vol. 12, No. 6, June 2021 | pp. 41–48
DOI: 10.46882/2021/IJP/000134
Research Article
Title: Finite Element Modeling of Acoustic Wave Scattering and Tunable Attenuation in Porous Magnetorheological Elastomers
Names of Authors: P. J. O’Connor¹, G. S. Campbell²
Authors’ Affiliations:
¹ Department of Civil and Environmental Engineering, University College Cork, Cork, Ireland
² Research School of Physics and Engineering, Australian National University, Canberra, Australia
Abstract: Controlling acoustic wave transmission paths and focal spots in dense underwater and mechanical structural systems is vital for developing smart noise barriers, specialized non-destructive evaluation systems, and adaptive shock absorption components. This paper introduces a comprehensive finite element modeling framework to simulate acoustic wave scattering profiles and track tunable attenuation properties inside porous magnetorheological elastomer matrices. The mathematical approach links Biot's dynamic equations of poroelasticity with an empirical magneto-elastic constitutive setup to capture material responses under variable external magnetic fields. Numerical simulations were executed across an acoustic sweep from 20.0 kHz to 500.0 kHz. The models demonstrate that adjusting the external magnetic flux density induces a significant change in the material's shear modulus tensor, creating a tunable attenuation peak for the fast compressional wave mode at 185.0 kHz. This damping region can be shifted continuously by 38.0% across the frequency spectrum via external field adjustments. Experimental verification used 3D-printed porous elastomer specimens enriched with iron nanoparticles, matching the numerical attenuation data within a ±5.0% margin.
Keywords: Acoustic metamaterials; finite element modeling; magnetorheological elastomers; Biot's theory; wave scattering; tunable attenuation
Manuscript Timeline: Received: March 02, 2021; Revised: April 14, 2021; Accepted: May 02, 2021; Published: June 15, 2021
Citation: O’Connor, P. J., & Campbell, G. S. (2021). Finite Element Modeling of Acoustic Wave Scattering and Tunable Attenuation in Porous Magnetorheological Elastomers. International Journal of Physics, 12(6), 41–48.
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