A tensile property zero poisson's ratio fold paper metamaterial cell structure and lattice structure

Abstract

The application discloses a kind of tensile characteristics zero poisson's ratio fold paper metamaterial cell structure and lattice structure, cell structure includes two rigid support plates and four tensile units, two rigid support plates are parallel and spaced distribution up and down;Four tensile units are respectively installed between two rigid support plates and are evenly distributed along its circumferential direction.This application introduces the mechanism of paper folding into the structural design of zero poisson's ratio metamaterial, and combines with tensile integral structure, so that in the case of having the mechanical characteristics of zero poisson's ratio, it also has the self-stabilizing and self-recovery effect of tensile integral.

Description

Technical Field

[0001] The present invention relates to the technical field of zero Poisson's ratio metamaterial structures, and more particularly to a zero Poisson's ratio origami metamaterial cell structure and lattice structure with tensile properties. Background Art

[0002] Metamaterials are non-natural materials whose properties derive from their structure rather than their chemical composition. They are artificially synthesized materials with special structures that exhibit unique properties in mechanics, electromagnetic waves, sound waves, and other fields. Based on their application, metamaterials can be divided into four categories: electromagnetic metamaterials, acoustic metamaterials, thermal metamaterials, and mechanical metamaterials. Zero Poisson's ratio metamaterials are a subtype of mechanical metamaterials. When subjected to pressure, the ratio of the lateral normal strain to the axial normal strain in a certain direction (Poisson's ratio) is zero. These materials possess many unique properties, such as highly controllable elasticity, lightweight, and high strength. They can be used in various fields, such as robotics, medicine, and aerospace, making their research and application promising and attracting widespread attention in recent years.

[0003] Currently, there are a variety of cellular structures that achieve zero Poisson's ratio properties in existing technologies. However, designing metamaterials with given target properties or functions is still extremely difficult. To date, many designs rely on luck and intuition, and it is impossible to rationally design geometric and topological shapes to obtain new lattice metamaterials with zero Poisson's ratio effect.

[0004] Therefore, providing a tensile property zero Poisson's ratio origami metamaterial cell structure and lattice structure is a problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a tensile zero Poisson's ratio origami metamaterial cellular structure and lattice structure, which has a reasonable structural design and realizes the self-stabilization and self-recovery effect of the tensile whole on the basis of the mechanical properties of zero Poisson's ratio.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A tensile characteristic zero Poisson's ratio origami metamaterial cellular structure comprises two rigid support plates and four tensile units, wherein the two rigid support plates are parallel to each other and spaced apart; the four tensile units are respectively installed between the two rigid support plates and are evenly distributed along their circumference.

[0008] Furthermore, the four tensioning units have the same structure and all include a Sarrus mechanism, an elastomer and a spring. The Sarrus mechanism is rotatably connected to the two rigid support plates respectively; the elastomer is fixed between the two rigid support plates and is located on the inner side of the Sarrus mechanism; and the two ends of the spring are fixedly connected to the corner ends of the two rigid support plates respectively.

[0009] Furthermore, the Sarrus mechanism includes two symmetrically distributed connecting rod mechanisms, each of the connecting rod mechanisms includes two rigid connecting plates, the two rigid connecting plates are connected by a first hinge, and the two rigid connecting plates are respectively connected to the two rigid support plates by a second hinge.

[0010] Furthermore, the elastomer is a thermoplastic polyurethane elastomer.

[0011] A tensile property zero Poisson's ratio origami metamaterial lattice structure comprises a plurality of tensile property zero Poisson's ratio origami metamaterial cell structures as described above that are arranged and connected in a transverse or longitudinal direction.

[0012] It can be seen from this that the present invention provides a tensile zero Poisson's ratio origami metamaterial cell structure and lattice structure, which has the following beneficial effects compared with the prior art:

[0013] The mechanical cell is designed based on the principle of origami mechanism, so that the structure has the effect of fixed-section parallel motion during movement. The tensegrity structure is combined with the origami structure, so that the overall structure has the mechanical properties of zero Poisson's ratio and the self-stabilization and self-recovery effects of tensegrity. This can make the overall structure have good energy absorption and shock absorption effects. Through the movement mechanism of the Sarrus mechanism, the overall structure has a linkage effect during movement. When subjected to mechanical impact, the force concentrated at a certain point can be transferred to the overall structure. Compared with traditional metamaterial shock-absorbing structures such as zero Poisson's ratio, negative Poisson's ratio, and zero stiffness, when subjected to impact, the overall structure consumes the impact load, resulting in better shock absorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0015] Figure 1 The accompanying drawing is a schematic structural diagram of a tensile zero Poisson's ratio origami metamaterial cell structure provided by the present invention;

[0016] Figure 2 The accompanying drawing is a front view of a tensile zero Poisson's ratio origami metamaterial cell structure provided by the present invention;

[0017] Figure 3 The accompanying drawing is a schematic structural diagram of the connecting rod mechanism provided by the present invention;

[0018] Figure 4 The accompanying drawing is a schematic structural diagram of a tensile zero Poisson's ratio origami metamaterial lattice structure provided by the present invention;

[0019] Figure 5 The accompanying drawing is a schematic structural diagram of another form of a tensile zero Poisson's ratio origami metamaterial lattice structure provided by the present invention. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] like Figure 1-5 As shown, an embodiment of the present invention discloses a tensile characteristic zero Poisson's ratio origami metamaterial cellular structure, comprising two rigid support plates 1 and four tensile units 2, wherein the two rigid support plates 1 are parallel to each other and spaced apart; the four tensile units 2 are respectively installed between the two rigid support plates 1 and are evenly distributed along their circumferences, and each tensile unit 2 comprises a Sarrus mechanism 21, an elastic body 22 and a spring 23. In this embodiment, the elastic body 22 is a thermoplastic polyurethane elastomer, and the Sarrus mechanism 21 is rotatably connected to the two rigid support plates 1 respectively. Circular motion can be converted into linear motion. By combining four Sarrus mechanisms 21, the two rigid support plates 1 can generate only axial linear motion when loaded, and the centers of the two rigid support plates 1 can be kept aligned, thereby producing a constant-section motion effect. The elastic body 22 is fixed between the two rigid support plates 1 and located inside the Sarrus mechanism 21. The two ends of the spring 23 are fixedly connected to the corner ends of the two rigid support plates 1. The torsional force provided by the elastic body 22 cooperates with the spring 23 to achieve rigid-flexible coupling and give the structure tensile properties. The present invention introduces origami mechanics into the structural design of zero-Poisson's ratio metamaterials and combines them with tensegrity structures, so that while having the mechanical properties of zero Poisson's ratio, it also has the self-stabilizing and self-recovering effects of tensegrity.

[0022] Specifically, the Sarrus mechanism 21 includes two symmetrically distributed connecting rod mechanisms 211, each connecting rod mechanism 211 includes two rigid connecting plates 2111, and the two rigid connecting plates 2111 are connected by a first hinge 2112. At the same time, the two rigid connecting plates 2111 are respectively connected to the two rigid support plates 1 through a second hinge 2113, so that there is only rotational freedom between each rigid part.

[0023] An embodiment of the present invention also discloses a tensile zero Poisson's ratio origami metamaterial lattice structure, comprising a plurality of tensile zero Poisson's ratio origami metamaterial cell structures as described above that are arranged and connected in a transverse or longitudinal direction, that is, the metamaterial cell structures are arranged in a lattice to form a complete zero Poisson's ratio mechanical metamaterial with good shock absorption and energy absorption effects.

[0024] Working principle of the present invention:

[0025] When the surfaces of the two rigid support plates 1 are impacted, the tensegrity structure composed of four tensile units 2 dissipates energy, producing an energy absorption effect. Under the action of the Sarrus mechanism 21, when the upper and lower surfaces of the two rigid support plates 1 are subjected to axial loads, only axial movement can be generated, so that the force acting on the entire surface can be dispersed to various positions on the surface, thereby relieving pressure and producing a zero Poisson's ratio effect. In addition, due to the tensile characteristics, if the strength limit of each component in the structure is not exceeded, it can still rebound quickly through the action of the tensegrity structure after the load disappears.

[0026] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0027] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tensile zero Poisson's ratio origami metamaterial cell structure, characterized in that: It comprises two rigid support plates and four tensioning units, wherein the two rigid support plates are parallel to each other and spaced apart; the four tensioning units are respectively installed between the two rigid support plates and are evenly distributed along the circumference thereof; The four tensioning units have the same structure, each comprising a Sarrus mechanism, an elastic body, and a spring. The Sarrus mechanism is rotatably connected to the two rigid support plates respectively; the elastic body is fixed between the two rigid support plates and located inside the Sarrus mechanism; and both ends of the spring are fixedly connected to the corner ends of the two rigid support plates respectively. The Sarrus mechanism includes two symmetrically distributed connecting rod mechanisms, each of which includes two rigid connecting plates arranged vertically. The ends of the two rigid connecting plates that are close to each other are connected by a first hinge, and the ends of the two rigid connecting plates that are far away from each other are respectively connected to the two rigid support plates by a second hinge.

2. The tensile zero Poisson's ratio origami metamaterial cell structure according to claim 1, characterized in that: The elastomer is a thermoplastic polyurethane elastomer.

3. A tensile zero Poisson's ratio origami metamaterial lattice structure, characterized in that: The invention comprises a plurality of tensile property zero Poisson's ratio origami metamaterial cellular structures as claimed in claim 1 or 2, which are connected in a transverse or longitudinal direction.

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