The influence of the micro-topology on the phononic band gaps in 2D porous phononic crystals

被引：24
|
作者：
Liu, Ying [1 ]
Su, Jia-yu [1 ]
Gao, Lingtian [2 ]
机构：
[1] Beijing Jiaotong Univ, Inst Mech, Beijing 100044, Peoples R China
[2] Tsinghua Univ, Dept Engn Mech, Beijing 100084, Peoples R China
来源：
PHYSICS LETTERS A | 2008年 / 372卷 / 45期
基金：
中国国家自然科学基金;
关键词：
Phononic crystal; Band gap; FDTD;
D O I：
10.1016/j.physleta.2008.09.051
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The phononic band structures of two-dimensional metal porous phononic crystals consisting of different lattices (the lattice structures transformed from square to triangle). and pores of various shapes (circle, square, and triangle) and sizes are studied numerically by using Finite Difference Time Domain (FDTD) scheme. It is found that for x-y mode waves, the absolute phononic band gaps (PBGs) rely more on the pore shapes. For triangular pores, the PBG is opening in the whole process of the lattice transformation, and for circular ones, the PBG is closed after a certain lattice structure. No PBG forms in the crystals with square pores. The PBG can be varied by adjusting the size of the pores. But a critical porosity exists for the opening of the PBG. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：6784 / 6789
页数：6
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