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Indexed by:期刊论文

Date of Publication:2015-05-01

Journal:COMPUTATIONAL MATERIALS SCIENCE

Included Journals:SCIE、EI

Volume:102

Page Number:126-134

ISSN No.:0927-0256

Key Words:Nacreous composite material; Phononic crystal; Band gap manipulation; Vibration isolation; Multi-level substructure

Abstract:Inspired by natural nacreous materials with the excellent performance, two kinds of two-dimensional (2D) phononic crystals with the Brick-and-Mortar pattern are compared. To discuss the band structure, a multi-level substructure algorithm is employed which is efficient. Additionally, the influences on the band gap with different material and geometric parameters of the model are examined, and the range of the band gap is turned out to be adjustable by changing these parameters. Furthermore, a kind of 3D nacreous composite material is designed based on the thought of staggered and combined soft and hard materials. In the 3D band structure analysis, the designed material generates an ultrawide low frequency band gap, similar to the results of the 2D case. The further numerical tests for the transmission characteristics and random vibration response reveal the significant vibration attenuation effect of the nacreous material compared with the reference materials. The results of the tests fit remarkably well with the band gap. Thus the devices for vibration reduction and isolation with various working frequencies can be designed by means of manipulating the band gap in the low frequency regime. (C) 2015 Elsevier B.V. All rights reserved.