Complex band structures of one-dimensional fluid-saturated porous phononic crystals in microscale

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2025-03-21 DOI:10.1016/j.compstruct.2025.119100

Chang Su, Wei Guan, Hengshan Hu

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引用次数: 0

Abstract

Porous materials have enormous potential for constructing miniaturized phononic crystals (PCs) for high-frequency sound isolation and noise attenuation applications owing to their unique mechanical properties. This study established a theoretical model of elastic waves in microscale PCs formed by periodic arrangements of fluid-saturated porous materials and investigated the complex band structures of obliquely incident longitudinal waves in a one-dimensional case. The proposed model added the couple-stress theory to the Biot theory to take into account the size effect caused by the solid skeleton’s internal microstructures. The results showed that in the presence of wave-type conversion, there were three types of Bloch waves in the PCs, and an anti-crossing band gap was generated between each of the two waves. The shear-wave velocity and band-gap frequency increased considerably when the size effect was considered. The characteristic length and porosity of the softer material in the composition had the same impact on the band structure, and their increases can lead to a widening in the absolute band gaps. As the thickness difference between the two constituent materials of PCs decreased, the band gaps became increasingly noticeable.

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.