Multidimensional multidirectional negative stiffness metamaterial structure and implementation method thereof

Abstract

The invention discloses a multi-dimensional multi-directional negative stiffness metamaterial structure and an implementation method thereof. A Britafil dot matrix is adopted as a negative stiffness metamaterial 'skeleton', a negative stiffness element is arranged at each dot matrix point to serve as a basic microstructure, and adjacent negative stiffness elements are connected through short straight beams. Two-dimensional and three-dimensional metamaterial configurations capable of presenting negative stiffness effects in multiple directions at the same time can be achieved, the dimensions ofelement configurations forming the metamaterial are not limited, the metamaterial structure can be a microcosmic material (smaller than or equal to 1 mm) and a macrostructure (larger than or equal to1 mm), and application scenes of the negative stiffness metamaterial are enriched.

Description

technical field [0001] The invention relates to a technology in the field of metamaterial structure design, in particular to a multidimensional and multidirectional negative stiffness metamaterial structure and its realization method. Background technique [0002] Variable stiffness metamaterials refer to metamaterials that have various stiffness characteristics due to structural changes during the deformation process. Among them, buckling negative stiffness metamaterials undergo elastic buckling under external loads, and the displacement increases while the force decreases, showing a negative stiffness effect. Unlike traditional honeycomb metamaterials that absorb energy through plastic deformation, negative stiffness metamaterials exhibit recoverable elastic deformation under compressive loads, thus possessing the advantage of being reusable. [0003] The initial shape of the prefabricated cosine-shaped curved beam can be expressed as w 0 (x)=h / 2[1-cos(2πx / l)], where the ...

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Problems solved by technology

[0006] In view of the limited and similar types of existing negative stiffness metamaterials, and the problem that most configurations only have negative stiffness effects in one direction, the present invention proposes a class of multidimensional and multidirectional negative stiffness metamaterial structures and their implementation methods, which can realize two-dimensional And three-dimensional metamaterial configurations that exhibit negative stiffness effects in multiple directions at the same time. The scale of the elementary configurations that constitute metamaterials is not limited, and can be microscopic materials (less than or equal to 1mm) and macroscopic structures (greater than or equal to 1mm). , enriching the application scenarios of negative stiffness metamaterials

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