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Proceedings Paper

Wave propagation in auxetic mechanical metamaterial: Bloch formalism for various boundary conditions
Author(s): Vivek Gupta; Anwesha Chattoraj; Arnab Banarjee; Bishakh Bhattacharya
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Paper Abstract

The auxetic meta-material is a special class of macro-structure designed for exhibiting negative Poisson’s ratio. The spatial repetition of the lattice affects the wave propagation and dynamic responses. In this study, a mathematical basis of Bloch analysis for auxetic media have been presented and shaded some important light on the application of the technique. For this design an analysis has been carried out to show how the periodic boundary condition changes with the connectivity, orientation and geometry of unit lattice. The corresponding eigen value problem is developed to obtain the propagation frequency which is the function of mass, stiffness matrix and the wave vector. Mapping of different forms which are associated with the nodal displacements of a unit cell to adjacent cell have been demonstrated and formulated mathematically and observed its effect on the reduced stiffness and mass matrices is studied. Modal analysis has been carried out using Abaqus 6.14 and the transverse nodal displacements obtained from the F.E analysis. The Bloch formulation for revolving-square type auxetic structure has been formulated and validated. Further, we have obtained the changes in auxetic behavior of the structure under different boundary conditions. The periodicity of a given lattice assists in determining the frequency bands within which the propagation of elastic waves is permitted. Further study is proposed for attenuation and transmission band analysis to steer the waves which roots the idea of vibration sink, in which we can damp the mechanical waves effectively at a specific location. The Auxetic meta-materials is envisaged to have a significant role in wave attenuation and wave steering, and can be used effectively for vibration control.

Paper Details

Date Published: 21 March 2019
PDF: 11 pages
Proc. SPIE 10967, Active and Passive Smart Structures and Integrated Systems XIII, 109671K (21 March 2019); doi: 10.1117/12.2514266
Show Author Affiliations
Vivek Gupta, Indian Institute of Technology Kanpur (India)
Anwesha Chattoraj, Delhi Technological Univ. (India)
Arnab Banarjee, Indian Institute of Technology Jammu (India)
Bishakh Bhattacharya, Indian Institute of Technology Kanpur (India)

Published in SPIE Proceedings Vol. 10967:
Active and Passive Smart Structures and Integrated Systems XIII
Alper Erturk, Editor(s)

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