کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1867678 | 1038319 | 2008 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The influence of the micro-topology on the phononic band gaps in 2D porous phononic crystals The influence of the micro-topology on the phononic band gaps in 2D porous phononic crystals](/preview/png/1867678.png)
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–yx–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.
Journal: Physics Letters A - Volume 372, Issue 45, 10 November 2008, Pages 6784–6789