Three-phase phonon functional material structure comprising comb-type interlayer and manufacturing method

Abstract

The invention discloses a three-phase phonon functional material structure comprising a comb-type interlayer, which comprises kernels. The outer surface of the kernel is coated with the interlayer; kernels are coaxially arranged in a matrix in an array; the interlayer is of a comb shape formed by wedges which are arranged on the outer surface of the kernel in a ring-shape; gaps are reserved between the wedges; the wedges on the interlayer are arranged on a strip body; the strip body is coaxially and circularly arranged on the outer surface of the kernel; the central axis of each wedge is vertical to the strip body or is at an inclination angle with the strip body; the elastic modulus of the interlayer is smaller than that of the matrix by one order; the radius of the kernel is greater than one quarter of a lattice constant; and the thickness of the interlayer is one ninth to one fourth of the radius of the kernel. According to the three-phase phone functional material structure provided by the invention, when the requirement on the structural acoustic characteristics are met, the structure size is reduced, a low frequency wideband acoustical band gap is obtained; and the structure comprises the kernels which are periodically distributed and are coated with the comb-shaped interlayer, and is simple to process.

Description

technical field [0001] The invention belongs to acoustics, relates to the fields of machinery, condensed matter physics, mechanics, material science and the like, and in particular relates to a comb-shaped interlayer-containing three-phase phonon functional material structure and a manufacturing method thereof. Background technique [0002] In recent years, a kind of artificial periodic composite structure - phononic crystal has attracted extensive attention. Phononic crystal is a kind of acoustic bandgap functional material formed by periodic arrangement of two or more materials. Due to the periodic modulation of elastic constants, the propagating elastic waves may produce phonon band gaps, that is, the propagation of elastic waves in a certain frequency range is suppressed, which is conducive to creating a vibration-free environment and controlling the vibration and noise reduction of the structure. Give new life. Therefore, phononic crystals have become one of the activ...

AI Technical Summary

Problems solved by technology

However, due to the influence of the Fano phenomenon, the effective attenuation of elastic waves in the band gap is relatively small, and the formed band gap is sometimes too narrow, so there are still certain limitations.

Images