阅读说明：本技术 一种具有负泊松比效应的组合结构 (Composite structure with negative Poisson ratio effect ) 是由 任鑫 蒋慰 骆陈 于 2021-10-22 设计创作，主要内容包括：本发明公开了一种具有负泊松比效应的装配式组合结构,包括波纹板和方管,所述波纹板和方管按排布实现整体结构的负泊松比效应。首先,设计好波纹板尺寸、方管的尺寸和整体尺寸；其次按照实际受力要求或应用场景,选择波纹板和方管的材质,波纹板材质要满足有一定的延性,可实现大变形弯折,方管无特定的要求,可以实现与波纹板稳定连接即可。然后按照设计要求的连接顺序,选择合适的连接方法进行连接,可采用的连接有：粘接、焊接、铆接等。本发明装配式组合结构被证明具有很强的新颖性和实用性,在实现负泊松比效应的同时具备变刚度特性,在冲击防护、航空航天和传感器等领域具有极大应用潜能。(The invention discloses an assembled combined structure with a negative Poisson ratio effect, which comprises corrugated plates and square tubes, wherein the corrugated plates and the square tubes are arranged to realize the negative Poisson ratio effect of the whole structure. Firstly, designing the size of a corrugated plate, the size of a square tube and the overall size; secondly according to actual atress requirement or applied scene, select the material of buckled plate and square pipe, the buckled plate material will satisfy and have certain ductility, can realize the big deformation and buckle, and square pipe does not have specific requirement, can realize with the buckled plate stable connection can. Then according to the connection sequence required by design, selecting a proper connection method for connection, wherein the connection method can be adopted as follows: bonding, welding, riveting, etc. The assembled combined structure has strong novelty and practicability, has the variable rigidity characteristic while realizing the negative Poisson ratio effect, and has great application potential in the fields of impact protection, aerospace, sensors and the like.)

1. A composite structure having a negative poisson's ratio effect, characterised in that: including buckled plate and side pipe, buckled plate and side pipe are arranged according to following and are realized overall structure's negative poisson ratio effect:

corrugated plate end bending length L1, corrugated plate middle section bending distance L3 and square tube width L₅Satisfies the relationship: l is₁>L₅、L₃>L₅；

Bending radius R of the corrugated plate₁And bending radius R of the square tube₂Width L of square tube₅The relationship should be satisfied:

the bending angle theta of the corrugated plate satisfies the following conditions: 0 ° < θ <180 °;

wall thickness t of the corrugated plate₁Satisfies the following conditions:L₂is the length of the diagonal rod of the corrugated plate, L₄Is the length of a square tube;

wall thickness t of the square tube₂It should satisfy:

height h of corrugated plate in the combined structure₁Height h of square tube₂Satisfies the following conditions:L₆the length of the whole structure is a combined structure;

the length L of the integral structure of the combined structure₆And overall structural width L₇Satisfies the following conditions:

the square pipes and the corrugated plates are alternately and alternately connected.

2. A composite structure having a negative poisson's ratio effect as claimed in claim 1, wherein: the square tube includes solid ribs and tubular ribs.

3. A composite structure having a negative poisson's ratio effect as claimed in claim 1, wherein: the connection mode of the square pipe and the corrugated plate comprises bonding, welding or riveting.

4. A composite structure having a negative poisson's ratio effect as claimed in claim 1, wherein: the square tube structure is replaced by a solid square rod, a hollow square rod and an irregular-shaped connecting unit.

Technical Field

The invention relates to a combined structure with a negative Poisson ratio effect, which is designed by assembling corrugated plates and square tubes, and belongs to the field of new materials and new structures.

Background

Unlike most materials in nature, negative poisson's ratio materials or structures contract when under compression and expand when under tension. The special mechanical behavior enables the negative Poisson ratio material or structure to show a plurality of ideal mechanical properties, and the shear bearing capacity, the fracture resistance, the energy absorption and consumption capacity and the dent resistance of the negative Poisson ratio material or structure are improved to a certain extent compared with those of the positive Poisson ratio material. The excellent mechanical performances also enable the negative Poisson ratio material and structure to have huge application potential in the fields of medical treatment, aerospace, impact protection, sensors and the like. Negative poisson's ratio materials and structures are also an important research hotspot, and more scholars are invested in the research of negative poisson's ratio materials and structures.

Negative poisson's ratio materials have been developed for over thirty years with a number of achievements. However, due to the complex topology of negative poisson's ratio structures, most existing negative poisson's ratio structures are based on costly manufacturing processes, such as 3D printing techniques, laser cutting techniques. The high-cost manufacturing process also limits the popularization and practical application of the negative poisson ratio structure, and the reduction of the manufacturing cost of the negative poisson ratio structure becomes a hot problem in the field. The 3D printing technology and the laser cutting technology have higher requirements on base materials, and the manufactured size also has corresponding requirements, so that most negative Poisson ratio structures are manufactured on members with smaller sizes at present, and the application of the negative Poisson ratio structures in larger engineering and fields is difficult to realize.

The negative Poisson ratio effect in a certain direction can be realized by utilizing the existing simple structures on the market, namely corrugated plates and square tubes, through the set arrangement and combination design, the structure supports splicing and even compounding of various materials, the supported materials comprise cheap materials such as aluminum materials, plastics and the like, and the low-cost manufacture of the negative Poisson ratio structure is realized. Due to the combined structure, large-area assembly can be realized, so that the application requirements on various scales are met.

Disclosure of Invention

The invention aims to break through the manufacturing bottleneck of the current negative Poisson ratio structure, realize the manufacture of the negative Poisson ratio structure with large size, high efficiency and low cost by utilizing corrugated plates and square tubes, and provide a combined structure with the negative Poisson ratio effect so as to realize the practical application and popularization of the negative Poisson ratio structure.

The technical scheme adopted by the invention is as follows: the utility model provides a integrated configuration with negative poisson ratio effect, includes buckled plate and square pipe, buckled plate and square pipe are arranged according to following and are realized the negative poisson ratio effect of overall structure:

corrugated plate end bending length L1, corrugated plate middle section bending distance L3 and square tube width L₅Satisfies the relationship: l is₁>L₅、L₃>L₅；

Bending radius R of the corrugated plate₁And bending radius R of the square tube₂Width L of square tube₅The relationship should be satisfied: the process range should be as small as possible;

the bending angle theta of the corrugated plate satisfies the following conditions: 0 ° < θ <180 °;

wall thickness t of the corrugated plate₁Satisfies the following conditions:L₂is the length of the diagonal rod of the corrugated plate, L₄Is the length of a square tube;

wall thickness t of the square tube₂It should satisfy:

height h of corrugated plate in the combined structure₁Height h of square tube₂Satisfies the following conditions:L₆the length of the whole structure is a combined structure;

the length L of the integral structure of the combined structure₆And overall structural width L₇Satisfies the following conditions:

the square pipe and the corrugated plate are connected in an alternating and staggered mode, and the overall effect is achieved.

Preferably, the square pipe includes a solid rib, a tubular rib, and various forms that can satisfy the connection and deformation requirements.

Preferably, the connection mode of the square pipe and the corrugated plate comprises a reliable connection method suitable for selected materials by means of bonding, welding and riveting.

Preferably, the square tube structure can be replaced by a solid square rod, a hollow square rod and an irregular-shaped connecting unit.

Due to the construction method of the assembly, the combined structure can be arranged according to different size requirements, the number of the rows is not limited in the arrangement direction, but the size requirements are met;

the structural base material designed by the invention has high degree of freedom, and the corrugated plate can meet the condition of deformation ductility. The square pipe is the linkage unit, removable other forms linkage unit that be, and the essential attribute of ductility non-linkage unit, the shape also can design to it does not hinder the buckled plate deformation to increase its practicality or aesthetic property can.

The key of the negative Poisson ratio effect generated by the invention lies in the design of the structure of the specific arrangement form of the corrugated plates and the square tubes. The combined structure designed by the method has obvious negative Poisson ratio effect, and can maintain the negative Poisson ratio performance in a large strain range. In addition, the designed negative Poisson ratio composite structure can realize the compounding of different materials, and the building under the scale in a large range can be realized according to the size definition of the corrugated plate and the square tube.

Has the advantages that: the corrugated plate is manufactured by adopting an assembly method based on the corrugated plate main body and the square tube. Through the assembly design of common materials on the market, the structure shows a negative Poisson ratio effect when the structure is integrally stressed, and has a plurality of excellent mechanical response and engineering application advantages such as dent resistance, curved surface isotropy and shear resistance. The special shape and mechanical response of the structure also enable the structure to have the characteristic of controllable variable rigidity, namely, when the deformation reaches a certain specific value, the rigidity of the structure can be obviously improved, the characteristic can provide soft buffering under small deformation and sufficient energy absorption under large deformation, and the structure has certain application potential in protection and graded sensing. Due to the high assembly freedom degree, the structure can be assembled by adopting most materials, and the materials with various strengths and properties are compounded to meet different application scenes.

The invention utilizes simple components, namely corrugated plates and square tubes, to carry out specific arrangement and combination to form a combined structure with a negative Poisson ratio effect, realizes low-cost manufacture and large-volume manufacture of the negative Poisson ratio structure, and promotes the practical application of the negative Poisson ratio structure.

Drawings

FIG. 1 is a top view of a corrugated sheet in a composite structure having a negative Poisson's ratio effect;

FIG. 2 is a top view of a square tube in a composite structure having a negative Poisson ratio effect.

FIG. 3 is a front view of a composite structure having a negative Poisson ratio effect;

FIG. 4 is a side view of a composite structure having a negative Poisson ratio effect;

FIG. 5 is a three-dimensional view of a composite structure having a negative Poisson ratio effect.

Detailed Description

The invention will be further described with reference to the following detailed description and the accompanying drawings:

as shown in fig. 1 to 5, a combined structure with a negative poisson's ratio effect comprises a corrugated plate and a square pipe, and taking the combination of a corrugated plate 8 and a square pipe 31 as an example, the corrugated plate and the square pipe are arranged as follows to realize the negative poisson's ratio effect of the whole structure:

corrugated plate end bending length L1, corrugated plate middle section bending distance L3 and square tube width L₅Satisfies the relationship: l is₁>L₅、L₃>L₅；

Bending radius R of the corrugated plate₁And bending radius R of the square tube₂Width L of square tube₅The relationship should be satisfied: the process range should be as small as possible;

the bending angle theta of the corrugated plate satisfies the following conditions: 0 ° < θ <180 °;

wall thickness t of the corrugated plate₁Satisfies the following conditions:L₂is the length of the diagonal rod of the corrugated plate, L₄Is the length of a square tube;

wall thickness t of the square tube₂It should satisfy:

height h of corrugated plate in the combined structure₁Height h of square tube₂Satisfies the following conditions:L₆the length of the whole structure is a combined structure;

the length L of the integral structure of the combined structure₆And overall structural width L₇Satisfies the following conditions:

the square pipe and the corrugated plate are connected in an alternating and staggered mode, and the overall effect is achieved.

The design of the composite structure comprises the following steps:

1) selecting a base material according to practical application scenes, and designing related parameters including the wall thickness t1 of the corrugated plate and the bending length L of the end part of the corrugated plate₁Corrugated plate bending radius R₁Bending angle theta of corrugated plate and length L of inclined rod of corrugated plate₂The bending distance L of the middle section of the corrugated plate₃Height h of corrugated plate₁Wall thickness t of square tube₂Length L of square tube₄Square tube width L₅Bending radius R of square tube₂Height h of square tube₂Overall structural length L₆And overall structural width L₇The designed corrugated plate and square tube are obtained, and the corrugated plate and the square tube are assembled by selecting a reliable connection mode；

2) The designed combined structure can be arranged according to different size requirements due to the construction method of assembly, the number of the rows is not limited in the arrangement direction, but the size requirements are met;

3) the structural base material of design is selected to have high degree of freedom, and the buckled plate satisfies the condition of deformation ductility can. The square pipe is the linkage unit, removable other forms linkage unit that be, and the essential attribute of ductility non-linkage unit, the shape also can design to it does not hinder the buckled plate deformation to increase its practicality or aesthetic property can.

The square pipe comprises solid ribs, tubular ribs and various forms which can meet the requirements of connection and deformation. The connection mode of the square tube and the corrugated plate comprises a reliable connection method suitable for selected materials through bonding, welding and riveting. The square tube structure can be replaced by a solid square rod, a hollow square rod and an irregular-shaped connecting unit.

It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention. Components not explicitly described in this example can be implemented using existing techniques.