Dispersive Elastodynamics of 1D Banded Materials and Structures: Design

Details Dispersive Elastodynamics of 1D Banded Materials and Structures: Design Dispersive Elastodynamics of 1D Banded Materials and Structures: Design

2006-10-21

arxiv.org/abs/cond-mat/0610594v1

Journal of Sound and Vibration 307, 865-893 (2007)

Physics

Condensed Matter

Materials Science

33 text pages, 27 figures

Scientific paper

10.1016/j.jsv.2005.02.030

Within periodic materials and structures, wave scattering and dispersion occur across constituent material interfaces leading to a banded frequency response. In an earlier paper, the elastodynamics of one-dimensional periodic materials and finite structures comprising these materials were examined with an emphasis on their frequency-dependent characteristics. In this work, a novel design paradigm is presented whereby periodic unit cells are designed for desired frequency band properties, and with appropriate scaling, these cells are used as building blocks for forming fully periodic or partially periodic structures with related dynamical characteristics. Through this multiscale dispersive design methodology, which is hierarchical and integrated, structures can be devised for effective vibration or shock isolation without needing to employ dissipative damping mechanisms. The speed of energy propagation in a designed structure can also be dictated through synthesis of the unit cells. Case studies are presented to demonstrate the effectiveness of the methodology for several applications. Results are given from sensitivity analyses that indicate a high level of robustness to geometric variation.

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