Wave Propagation in Auxetic Tetrachiral Honeycombs

This paper describes a numerical and experimental investigation on the flexural wave propagation properties of a novel class of negative Poisson's ratio honeycombs with tetrachiral topology. Tetrachiral honeycombs are structures defined by cylinders connected by four tangent ligaments, leading to a negative Poisson's ratio (auxetic) behavior in the plane due to combined cylinder rotation and bending of the ribs. A Bloch wave approach is applied to the representative unit cell of the honeycomb to calculate the dispersion characteristics and phase constant surfaces varying the geometric parameters of the unit cell. The modal density of the tetrachiral lattice and of a sandwich panel having the tetrachiral as core is extracted from the integration of the phase constant surfaces, and compared with the experimental ones obtained from measurements using scanning laser vibrometers. [DOI: 10.1115/1.4000785]


Published in:
Transactions- American Society of Mechanical Engineers Journal of Vibration and Acoustics, 132, 3, 031007-8
Year:
2010
Publisher:
American Society of Mechanical Engineers
ISSN:
1048-9002
Keywords:
Laboratories:


Note: The status of this file is: EPFL only


 Record created 2011-05-02, last modified 2018-03-17

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