A tunable bandgap mechanical metamaterial with high tensile strength

Abstract

The invention discloses a high-tensile-strength mechanical metamaterial adjustable in band gap. The high-tensile-strength mechanical metamaterial adjustable in band gap is characterized in that the metamaterial comprises an elastic perforated plate and a clamping plate; the elastic perforated plate is provided with a plurality of through holes arranged in a matrix form; each through hole is defined by an upper edge arc line, a right end arc line, a lower edge arc line and a left end arc line in sequence, the upper edge arc line and the lower edge arc line are in mirror symmetry, openings of the upper edge arc line and the lower edge arc line are away from each other, the left end arc line and the right end arc line in mirror symmetry, openings of the left end arc line and the right end arcline are away from each other; and the outer edge of the elastic perforated plate is connected with the inner edge of the clamping plate through a plurality of elastic connection bodies. According tothe high-tensile-strength mechanical metamaterial adjustable in band gap, the clamping plate is pulled by external mechanical force to drive the elastic perforated plate to move, so that a square celluar geometrical configuration is changed, real-time continuous adjusting of the band gap is achieved, operation is convenient and easy to achieve, in addition, the reliability of the metamaterial during drawing is ensured through the high-tensile-strength through hole configuration design, and the engineering practicality is high.

Description

technical field [0001] The invention belongs to the field of supermaterial design, in particular to a high tensile strength adjustable bandgap mechanical supermaterial. Background technique [0002] Mechanical metamaterials are a class of materials or structures composed of specially designed artificial structural units periodically arranged, which have special mechanical properties that natural materials do not have, and they can all be called artificial periodic structures. Studies have shown that specially designed artificial periodic structures have frequency ranges that can suppress the propagation of elastic waves, which are called band gaps. By adjusting the geometric / material parameters of the artificial periodic structure, the position, width and suppression ability of the bandgap can be artificially adjusted. [0003] At present, there are many patents on acoustic metamaterials used in vibration control. These applications generally have fixed cell constants, mate...

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Problems solved by technology

[0004] In the existing patents and literature research on bandgap broadening, bandgap broadening is realized by means of additional oscillators, multi-frequency oscillators, or topology-optimized oscillator structures on phononic crystal plates, such as the document "Acoustic multi-stopband metamaterial plates design for broadband "elastic wave absorption and vibration suppression" adopts the method of adding multiple harmonic oscillators to widen the bandgap, but once the metamaterial structure of this method is determined, the bandgap cannot be adjusted in real time, and in some special cases, a bandgap of a certain frequency is required from time to time

[0005] In the existing patents and literature research on adjustable bandgap, the real-time adjustment of the bandgap is realized by adding piezoelectric sheets to the substrate beam plate and adjusting the embedded magnet pair, such as the literature "An adaptive metamaterial beam with hybrid shunting circuits for "extremely broadband control of flexural waves", etc. use piezoelectric stacks and a variety of additional circuits to realize real-time adjustable bandgap, but the structure and regulation of metamaterials in this way are very complicated; for example, an acoustic Sub-crystal vibration damping device, which uses the change of physical and mechanical parameters of magnetorheological elastomer under the action of electric field to realize the change of cell combination form, and its control mechanism is more and the control method is more complicated

For example, a phononic crystal vibration isolator based on a shape memory alloy with adjustable bandgap, which utilizes the shape memory effect of the shape memory alloy to achieve three-level vibration isolation, but due to the deterministic deformation of the shape memory alloy, in order to achieve the bandgap Multi-level regulation requires a complex regulatory mechanism

[0006] A comprehensive analysis found that in terms of real-time adjustable vibration and noise reduction frequency bands, the existing acoustic metamaterials still have the problems of complex resonant structures and control mechanisms, and difficult manipulation

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