Impact of shear deformation on the out-of-plane wave propagation in two-dimensional lattice materials
Publish Year: 1400
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ISME29_309
تاریخ نمایه سازی: 13 تیر 1400
Abstract:
Unlike the extensive studies on the in-plane motions of macroscale lattices, their out-of-plane motions have received drastically less attention in the mechanical engineering community. However, the practical limitations of the detection of very high-frequency in-plane vibrations in small-structures have restricted their investigations considerably leading the researchers toward their out-of-plane analysis. The necessity of measuring the out-of-plane displacements of the periodic lattices, especially in small-scale structures, demands a thorough perception of their out-of-plane behavior. As a result, in this paper, the out-of-plane wave propagation of periodic lattices with hexagonal, square, triangular, and kagome topologies is investigated using the finite element method and Bloch’s theorem. For the analysis of the out-of-plane wave propagation, the unit cells are discretized into grid elements, with three degrees of freedom (out-of-plane displacement, torsion, and out-of-plane bending) at each node. Additionally, the impact of shear deformation on the dispersion curves of the out-of-plane wave propagation is studied. Also, the directionality of the out-of-plane waves at low frequencies is investigated by analyzing the iso-frequency contours of each structure. The results reveal that the out-of-plane dispersion curves with much more isotropic behavior have different patterns compared to their in-plane counterparts. Besides, the wave-attenuation capabilities of the structures with various topologies are investigated and compared with the in-plane mode.Keywords: Wave propagation, Out-of
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Authors
Soroush Sepehri
PhD. student, School of Mechanical Engineering, University of Tehran, Tehran, Iran
Mahmoud Mosavi Mashhadi
Professor, School of Mechanical Engineering, University of Tehran, Tehran, Iran
Mir Masoud Seyyed Fakhrabadi
Assistant professor, School of Mechanical Engineering, University of Tehran, Tehran, Iran