A bistable negative poisson's ratio metamaterial structure

Abstract

The application discloses a bistable negative Poisson's ratio metamaterial structure, which comprises rigid rods A, B and C, and the rigid rods A, B and C are connected with integrally-formed rigid rods D, E, F, G, H, R and J and integrally-cast elastomers on the upper and lower sides. The application has the beneficial effects that the integral tensile structure is combined with the negative Poisson's ratio metamaterial, the self-balancing and self-stabilizing characteristics are achieved, and the shear resistance, shock resistance, energy absorption and other characteristics are enhanced.

Description

Technical Field

[0001] This invention relates to the field of negative Poisson's ratio metamaterials, and in particular to a bistable negative Poisson's ratio metamaterial structure. Background Technology

[0002] Negative Poisson's ratio metamaterials are a type of supernatural material that almost does not exist in nature. Ordinary materials all have a positive Poisson's ratio, while negative Poisson's ratio metamaterials, as the name suggests, have a negative Poisson's ratio. This means that when subjected to lateral stretching (compression), the longitudinal length will undergo unconventional stretching (compression). This makes negative Poisson's ratio metamaterials far superior to traditional materials in terms of shock absorption, energy absorption, and shear resistance.

[0003] The tensioned monolithic structure possesses self-stability, self-recovery, and adaptability that traditional negative Poisson's ratio metamaterials lack. At the same time, the tensioned monolithic structure also has strong shock absorption and energy absorption capabilities.

[0004] Current improvements to negative Poisson's ratio metamaterials are mostly based on arraying and reorganizing the basic structure to optimize performance, seemingly without combining them with other structures for improvement. Furthermore, negative Poisson's ratio metamaterials themselves lack self-stability. Therefore, this invention combines a negative Poisson's ratio metamaterial with a tensioned monolithic structure, enabling the negative Poisson's ratio metamaterial to acquire tensioned monolithic properties, and the tensioned monolithic structure to acquire negative Poisson's ratio properties. This combines these advantageous characteristics and further enhances the already excellent shear resistance, seismic energy absorption, and energy absorption properties of the negative Poisson's ratio metamaterial. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned problems by designing a bistable negative Poisson's ratio metamaterial structure.

[0006] The technical solution of the present invention to achieve the above objectives is a bistable negative Poisson's ratio metamaterial structure, comprising rigid rod A, rigid rod B, and rigid rod C, wherein rigid rods D, E, F, G, H, and R, and an integrally formed cast elastomer are connected on the upper and lower sides of the rigid rods A, B, and C.

[0007] The insertion of rigid members A, B, and C gives the overall structure the characteristics of rigid-flexible coupling. The three rigid members are inserted in a 120° array following the structure.

[0008] The implantation of rigid members D, E, F, G, H, and R, along with six other rigid members placed symmetrically on the back, gives the overall structure internal stress and tension characteristics.

[0009] The pin is added at the connection point A, the connection point B, the connection point C, the connection point D, the connection point E, the connection point F, so that the cells are arrayed and connected in the transverse direction, and the connection point G plays a role of fixing the large rigid rod.

[0010] Specifically, the connection point A, the connection point B, the connection point C, the connection point D, the connection point E and the connection point F are blind holes, and the connection point G is a through hole; the pin is inserted into the connection point G, so that the cells are arrayed and connected in the longitudinal direction.

[0011] The double-stable negative Poisson's ratio metamaterial structure is manufactured by using the technical scheme of the application, provides a double-stable tensile whole and negative Poisson's ratio metamaterial composite cell structure, and is designed as a single cell double-layer structure to better connect the cells. In this way, the cells can be directly connected in the vertical direction through the pin, and the cell center is also connected through the pin, so that the stability is increased. By adopting the above scheme, the tensile whole structure is combined with the negative Poisson's ratio metamaterial, the self-balancing and self-stabilizing characteristics are achieved, and the shear resistance, shock absorption and energy absorption characteristics are enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 The drawing is a single cell diagram provided by the application based on the combination of the double-stable tensile whole and the negative Poisson's ratio metamaterial structure;

[0013] Fig. 2 The drawing is a single cell diagram provided by the application based on the combination of the double-stable tensile whole and the negative Poisson's ratio metamaterial structure;

[0014] Fig. 3 The drawing is a cell array provided by the application based on the combination of the double-stable tensile whole and the negative Poisson's ratio metamaterial composite structure;

[0015] In the drawing, 1 is a rigid rod A; 2 is a rigid rod B; 3 is a rigid rod C; 4 is a rigid rod D; 5 is a rigid rod E; 6 is a rigid rod F; 7 is a rigid rod G; 8 is a rigid rod H; 9 is a rigid rod R; 10 is an integrated pouring elastomer; 11 is a connection point A; 12 is a connection point B; 13 is a connection point C; 14 is a connection point G; 15 is a connection point D; 16 is a connection point E; and 17 is a connection point F. DETAILED DESCRIPTION

[0016] The application will be specifically described below in combination with the drawings, as shown in a double-stable negative Poisson's ratio metamaterial structure, Figs. 1-3

[0017] including a rigid rod A, a rigid rod B and a rigid rod C, and the rigid rod A, the rigid rod B and the rigid rod C are connected with an integrally formed rigid rod D, a rigid rod E, a rigid rod F, a rigid rod G, a rigid rod H, a rigid rod R and an integrated pouring elastomer on the upper and lower sides; ​

[0018] Through implantation of the rigid rods A, B, and C, the overall structure has the characteristics of rigid-flex coupling, and the three rigid rods are implanted in a 120° array;

[0019] Through implantation of the rigid rods D, E, F, G, H, R, and the six rigid members symmetrically placed on the back of the six small rigid rods, the overall structure has the characteristics of internal stress and tension;

[0020] Pins are added to the connection points A, B, C, D, E, and F, so that the cells are arrayed and connected in the transverse direction, and the connection point G serves to fix the large rigid rod.

[0021] Specifically, the connection points A, B, C, D, E, and F are blind holes, and the connection point G is a through hole; a pin is inserted into the connection point G, so that the cells are arrayed and connected in the longitudinal direction.

[0022] In the initial state, i.e., the first stable state of the bistable tensioned whole, when the structure receives external pressure, part of the structure of the elastic member 10 will be internally contracted; if the load is sufficient, the second stable state can be reached, at which time the structure still has stability; if the load is too large, after reaching the second stable state, the overall structure will not immediately collapse due to the tensioned whole, but will continue to be internally contracted under the action of the load; if the load does not exceed the strength limit of the structure, the structure can still quickly rebound and recover to the second stable state through the action of the tensioned whole after the load disappears.

[0023] The above technical solution only embodies the preferred technical solution of the technical solution of the present application, and some changes that the person skilled in the art can make to some parts of the present application also embody the principle of the present application and are within the protection scope of the present application.

Claims

1. A bistable negative Poisson's ratio metamaterial structure, characterized in that, It includes rigid rods A, B, and C, and rigid rods D, E, F, G, H, and R are integrally formed rigid rods on the upper and lower sides of the rigid rods A, B, and C, as well as an integrally cast elastomer. By implanting rigid members A, B, and C, the overall structure exhibits rigid-flexible coupling characteristics. The three rigid members are implanted in a 120° array following the structure. By implanting rigid rods D, E, F, G, H, and R, as well as six rigid members symmetrically placed on the back side, the overall structure acquires internal stress and tension characteristics. Add pins at connection points A, B, C, D, E, and F to allow the cells to be arranged and connected in a horizontal array. At the same time, connection point G serves to fix the large rigid member. Connection points A, B, C, D, E, and F are blind holes, while connection point G is a through hole. A pin is inserted at connection point G to allow the cells to overlap and connect longitudinally.

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