期刊
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
卷 195, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmecsci.2020.106227
关键词
Fluid-saturated porous media; Phononic crystals; Interface effects; Complex band structures
资金
- National Natural Science Foundation of China [11702017, 11991031, 11991032, 12021002, 11532001]
- Young Elite Scientists Sponsorship Program by CAST [YESS20170022]
- EIPHI Graduate School [ANR-17-EURE-0002]
The study investigates the influence of interface conditions between adjacent layers on wave propagation in fluid-saturated porous periodic structures. Different methods are used to obtain the complex band structure and poroelastic Bloch waves of the crystal, while analyzing the effects of pore blockage, porosity, and viscosity. The results show that pore blockage significantly affects the dispersion of poroelastic waves and energy partition between solid skeleton and pore fluid. The effects of porosity and viscosity in the case of the partial-open pore interface condition are similar to those in fully open pore conditions previously obtained.
The propagation of waves in fluid-saturated porous periodic structures is significantly affected by the interface condition between adjacent layers. We consider in this paper the partial-open pore interface condition between adjacent layers in a one-dimensional fluid-saturated porous phononic crystal. A transfer matrix method is devised to obtain both the complex band structure and the poroelastic Bloch waves of the crystal. Spectral transmission through a finite structure is further computed by a stiffness matrix method. Attention is restricted to normal incidence of longitudinal waves. The influence of the pore blockage, a parameter of the partial-open pore interface condition, and of porosity and viscosity are investigated. The value of the pore blockage is found to influence significantly both the dispersion of poroelastic waves but also the partition of wave energy between solid skeleton and pore fluid. The effects of porosity and viscosity in the case of the partial-open pore interface condition are similar to what was previously obtained in the fully open pore case.
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