Chin. Phys. Lett.  2003, Vol. 20 Issue (8): 1303-1305    DOI:
Original Articles |
Experimental and Theoretical Evidence for the Existence of Broad Forbidden Gaps in the Three-Component Composite
ZHANG Shu;HUA Jia;CHENG Jian-Chun
State Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093
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ZHANG Shu, HUA Jia, CHENG Jian-Chun 2003 Chin. Phys. Lett. 20 1303-1305
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Abstract The influence of localized resonance on the properties of band-gaps of the two-dimensional periodic composite are analysed numerically and experimentally by comparing the two-component phononic crystal with the three-component one. The three-component composite which exhibits localized resonance in the elastically soft coating ring is composed of a square array of coated cylinders embedded in an epoxy resin. The coated cylinders consist of a steel inner core and rubber coating, which has much smaller wave velocity and mass density than the matrix and the inner material. The measured transmission power of the three-component composite drops to the noise level in a broad ultrasonic frequency interval by contrast to the binary composite, which is in good agreement with the calculation using the finite element method.
Keywords: 43.35.Cg      43.20.Gp     
Published: 01 August 2003
PACS:  43.35.Cg (Ultrasonic velocity, dispersion, scattering, diffraction, and Attenuation in solids; elastic constants)  
  43.20.Gp (Reflection, refraction, diffraction, interference, and scattering of elastic and poroelastic waves)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2003/V20/I8/01303
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ZHANG Shu
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