Extensible separated auxetic honeycomb structure

Abstract

According to the expandable separated auxetic honeycomb structure provided by the utility model, the plurality of corrugated plates with the connecting grooves are arranged, and the connecting grooves among the different corrugated plates are mutually embedded, so that the plurality of corrugated plates are spliced to form the expandable separated auxetic honeycomb structure, and a single corrugated plate can be produced by using a traditional manufacturing process; therefore, the expandable separated auxetic honeycomb structure has lower manufacturing cost and higher production efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of tensile structure, specifically, a kind of expandable separation type tensile honeycomb structure. BACKGROUND

[0002] In recent years, due to social development and technological progress, the performance requirements of materials / structures used in many fields in the actual production process are also increasing. Developing new structures with high performance and lightweight has become one of the powerful means to explore new functions of materials, lead new directions of industry, improve comprehensive performance of materials and break through the bottleneck of scarce resources.

[0003] Due to the negative Poisson's ratio effect, tensile structures have many unique mechanical properties, such as good bearing capacity, super-elastic constant, and superior impact resistance, energy absorption performance, shock absorption, fracture toughness and fatigue resistance, etc. The superior mechanical properties make it have broad application prospects in many engineering fields, and thus attract the attention of scholars at home and abroad.

[0004] However, the existing tensile structure has a complex artificial design microstructure, which is difficult to produce and prepare using traditional production technology, and usually needs to be prepared by additive manufacturing, which is costly and cannot be mass-produced, resulting in that most of the tensile structures designed at present are still in the laboratory stage and cannot be put into actual production. SUMMARY

[0005] The utility model provides a kind of expandable separation type tensile honeycomb structure, the tensile structure manufacturing cost of prior art is improved for the problem of being higher, it is difficult to mass production, can reduce the manufacturing cost of tensile structure.

[0006] To achieve the above object, the utility model provides a kind of expandable separation type tensile honeycomb structure, including multiple corrugated sheets with protruding parts, multiple parallel connection grooves are provided on the corrugated sheet, the connection groove extends from the edge of the corrugated sheet to the inside of the corrugated sheet, the connection groove is arranged on the two sides of the protruding part, multiple rows of corrugated sheets and multiple columns of connection grooves of the corrugated sheet are embedded and connected with each other, every two rows of corrugated sheets and every two columns of corrugated sheets form a space by surrounding, and there is one protruding part on each side of the space. When the expandable separation type tensile honeycomb structure is subjected to tension in a certain direction, the bending degree of the protruding part on the four sides of the space is reduced, so that the size of the space in the direction of the tension and perpendicular to the direction of the tension is increased, so that the expandable separation type tensile honeycomb structure has a negative Poisson's ratio. The expandable separation type tensile honeycomb structure only needs to manufacture the corrugated sheet first, and then splices the corrugated sheet through the connection groove according to the needs, and the corrugated sheet can be manufactured by traditional manufacturing processes such as stamping, so that the manufacturing cost of the expandable separation type tensile honeycomb structure can be greatly reduced, and the manufacturing efficiency can be improved.

[0007] As an optional technical solution, the expandable separated auxetic honeycomb structure comprises a first unit, a second unit and a third unit, the first unit, the second unit and the third unit each comprise at least one of the air spaces, the first unit constitutes a corner of the expandable separated auxetic honeycomb structure; the second unit is connected to the first unit, and forms an edge of the expandable separated auxetic honeycomb structure; the third unit is connected to at least the second unit, and forms an inner part of the expandable separated auxetic honeycomb structure. A plurality of the corrugated plates are prefabricated into the first unit, the second unit and the third unit, and then a plurality of the first unit, the second unit and the third unit are spliced into the expandable separated auxetic honeycomb structure according to needs. Compared with directly splicing the corrugated plates into the structure, the process is less complex, and the production efficiency is improved.

[0008] As an optional technical solution, the corrugated plate has a cosine wave shape, and a wave crest or a wave trough forms the protruding part. The corrugated plate comprises a first corrugated plate and a second corrugated plate. The first corrugated plate has one cosine wave shape, and the second corrugated plate has two continuous cosine wave shapes. The connecting groove is arranged between adjacent wave crests and wave troughs. The corrugated plate has a cosine wave shape, so that the expandable separated auxetic honeycomb structure deforms more uniformly under stress, and the load bearing capacity of the expandable separated auxetic honeycomb structure is improved.

[0009] As an optional technical solution, the first unit comprises two first corrugated plates and two second corrugated plates. Any one of the first corrugated plates is embedded and connected to another first corrugated plate and a second corrugated plate, respectively. Any one of the second corrugated plates is embedded and connected to another second corrugated plate and a first corrugated plate, respectively.

[0010] The second unit comprises one first corrugated plate and three second corrugated plates. The connecting grooves of the three second corrugated plates are embedded and connected in sequence. The connecting grooves on both sides of the first corrugated plate are embedded and connected to two opposite second corrugated plates, respectively.

[0011] The third unit comprises four second corrugated plates which are embedded and connected in sequence through the connecting grooves. The first unit, the second unit and the third unit are arranged in the manner described in the technical solution, which is beneficial to dispersing the joints between different prefabricated units, so that the expandable separated auxetic honeycomb structure has good performance when bearing loads in different directions.

[0012] As an optional technical solution, the crests or troughs of the corrugated plates of two adjacent rows or two adjacent columns are oppositely arranged, so that the directions of the two opposite protrusions of the space are opposite, and when the two opposite protrusions are forced to be straightened or bent, the two opposite sides will move away or close to each other, so that the space is not easy to be deformed as a whole, thereby improving the stability of the expandable and separable auxetic honeycomb structure under load.

[0013] As an optional technical solution, the wavelength L of the corrugated plate and the thickness t of the corrugated plate satisfy L / t>20.

[0014] As an optional technical solution, the amplitude A of the corrugated plate and the wavelength L satisfy L>4A.

[0015] As an optional technical solution, the connecting groove is arranged along the width of the corrugated plate, and the center line of the connecting groove intersects the baseline of the cosine waveform. When the expandable and separable auxetic honeycomb structure is deformed under force, the corrugated plate is stretched or compressed, and due to the cosine waveform of the corrugated plate, the stress and strain at the connecting groove of the present technical solution are small, so that the influence of the connecting groove on the strength of the corrugated plate is low, which is beneficial to improve the load capacity of the expandable and separable auxetic honeycomb structure.

[0016] As an optional technical solution, the thickness t of the corrugated plate is equal to the width H of the connecting groove.

[0017] As an optional technical solution, the connecting groove of each column of the corrugated plate is located on the same side of the corrugated plate, and the connecting groove of each row of the corrugated plate is located on the same side of the corrugated plate. When the corrugated plates are assembled into the expandable and separable auxetic honeycomb structure, the connecting grooves of each column are located on the same side, and the corrugated plates of each row are located on the same side, which can reduce the complexity during assembly, and is beneficial to improve the production efficiency of the expandable and separable auxetic honeycomb structure.

[0018] The one or more technical solutions provided by the utility model have at least the following technical effects or advantages:

[0019] The expandable and separable auxetic honeycomb structure has lower manufacturing cost and higher production efficiency, and can better meet actual needs. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings described herein are used to provide further understanding of the embodiments of the present application, form a part of the present application, and do not constitute a limitation on the embodiments of the present application.

[0021] Figure 1 A schematic diagram of the expandable separated tensile honeycomb structure in the present application;

[0022] Figure 2 A Figure 1 A schematic diagram of the expandable separated tensile honeycomb structure in the present application;

[0023] Figure 3 A Figure 1 A schematic diagram of the hollow space in the present application;

[0024] Figure 4 A Figure 1 A schematic diagram of the first unit in the present application;

[0025] Figure 5 A Figure 1 A schematic diagram of the second unit in the present application;

[0026] Figure 6 A Figure 1 A schematic diagram of the third unit in the present application;

[0027] Figure 7 A schematic diagram of the expandable separated tensile honeycomb structure in an embodiment of the present application in a numerical simulation of the compression ratio-energy curve.

[0028] Explanation of reference signs

[0029] Corrugated plate-1; protrusion-11; connecting groove-12; first corrugated plate-13; second corrugated plate-14;

[0030] First unit-1A; second unit-1B; third unit-1C;

[0031] Hollow space-2. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] In the utility model, the terms "inner", "outer" and the like indicate the position or location relationship based on the position or location relationship shown in the drawings. These terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific position, or to be constructed and operated in a specific position.

[0034] In addition to indicating the position or location relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For ordinary skilled persons in the art, the specific meaning of these terms in the utility model can be understood according to the specific situation.

[0035] In addition, the terms "mounting", "setting", "providing", "connecting" and "connecting" should be understood broadly. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication between two devices, elements or components. For ordinary skilled persons in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific situation.

[0036] In addition, the terms "first", "second" and the like are mainly used to distinguish different devices, elements or components (the specific type and structure can be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0037] Embodiment one

[0038] The embodiment provides a kind of expandable separated tensile honeycomb structure, including multiple corrugated plates 1 with protruding part 11, multiple parallel connection slots 12 are provided on corrugated plate 1, connection slot 12 extends from the edge of corrugated plate 1 to the inside of corrugated plate 1, connection slot 12 is arranged on the two sides of protruding part 11, multiple rows of corrugated plates 1 and the connection slot 12 of multiple columns of corrugated plates 1 are embedded and connected with each other, every two rows of corrugated plates 1 and every two columns of corrugated plates 1 are enclosed to form space 2, there is a protruding part 11 in four edges of space 2.When the expandable separated tensile honeycomb structure is subjected to tension in a certain direction, the bending degree of the protruding part 11 in the four edges of space 2 is reduced, so that the size of space 2 in the direction of the tension and perpendicular to the direction of the tension is increased, so that the expandable separated tensile honeycomb structure has negative Poisson's ratio. When the expandable separated tensile honeycomb structure is manufactured, only corrugated plate 1 needs to be manufactured first, and then corrugated plate 1 is spliced according to needs through connection slot 12, and corrugated plate 1 can be manufactured by traditional manufacturing processes such as stamping, so that the manufacturing cost of the expandable separated tensile honeycomb structure can be greatly reduced, and the manufacturing efficiency can be improved.

[0039] Embodiment Two

[0040] On the basis of Embodiment One, the expandable separated auxano-honeycomb structure comprises a first unit 1A, a second unit 1B and a third unit 1C, the first unit 1A, the second unit 1B and the third unit 1C each comprise at least one space 2, the first unit 1A constitutes a corner of the expandable separated auxano-honeycomb structure; the second unit 1B is connected to the first unit 1A, and forms an edge of the expandable separated auxano-honeycomb structure; the third unit 1C is connected to at least the second unit 1B, and forms an interior of the expandable separated auxano-honeycomb structure. The plurality of corrugated plates 1 are prefabricated into the first unit 1A, the second unit 1B and the third unit 1C, and then a plurality of the first unit 1A, the second unit 1B and the third unit 1C are spliced into the expandable separated auxano-honeycomb structure according to needs. Compared with directly splicing the corrugated plates 1 into a structure, the complexity of the splicing process is lower, and the production efficiency is improved.

[0041] As an optional embodiment, the corrugated plate 1 has a cosine waveform, the wave crest or the wave trough forms the protrusion 11, the corrugated plate 1 comprises a first corrugated plate 13 and a second corrugated plate 14, the first corrugated plate 13 has one cosine waveform, the second corrugated plate 14 has two continuous cosine waveforms, and the connecting groove 12 is arranged between the adjacent wave crest and the wave trough. The corrugated plate 1 has the cosine waveform, so that the expandable separated auxano-honeycomb structure deforms more uniformly when subjected to stress, and the load bearing capacity of the expandable separated auxano-honeycomb structure is improved.

[0042] As an optional embodiment, the first unit 1A comprises two first corrugated plates 13 and two second corrugated plates 14, any first corrugated plate 13 is embedded and connected to another first corrugated plate 13 and a second corrugated plate 14 respectively, and any second corrugated plate 14 is embedded and connected to another second corrugated plate 14 and a first corrugated plate 13 respectively;

[0043] The second unit 1B comprises one first corrugated plate 13 and three second corrugated plates 14, the connecting grooves 12 of the three second corrugated plates 14 are sequentially embedded and connected, and the connecting grooves 12 on both sides of the first corrugated plate 13 are embedded and connected to the opposite two second corrugated plates 14 respectively;

[0044] The third unit 1C comprises four second corrugated plates 14 which are sequentially embedded and connected through the connecting grooves 12. The first unit 1A, the second unit 1B and the third unit 1C are arranged in the manner described in the embodiment, which is conducive to dispersing the joints between different prefabricated units, so that the expandable separated auxano-honeycomb structure has good performance when subjected to loads in different directions.

[0045] As an optional embodiment, the crests or troughs of the corrugated plates 1 of two adjacent rows or two adjacent columns are oppositely arranged, so that the space 2 is opposite to the two side protrusions 11 and the two side protrusions 11 are opposite to each other when the two side protrusions 11 are straightened or bent under force, so that the space 2 is not easy to be deformed as a whole, thereby improving the stability of the expandable and separable auxetic honeycomb structure under load.

[0046] As an optional embodiment, the wavelength L of the corrugated plate 1 and the thickness t of the corrugated plate 1 satisfy L / t>20.

[0047] As an optional embodiment, the amplitude A of the corrugated plate 1 and the wavelength L satisfy L>4A.

[0048] As an optional embodiment, the connecting groove 12 is arranged along the width of the corrugated plate 1, and the center line of the connecting groove 12 intersects the baseline of the cosine waveform. When the expandable and separable auxetic honeycomb structure is deformed under force, the corrugated plate 1 is stretched or compressed, and since the corrugated plate 1 is in the form of a cosine waveform, the stress and strain at the connecting groove 12 of the embodiment are small, so that the influence of the connecting groove 12 on the strength of the corrugated plate 1 is low, which is beneficial to improve the load capacity of the expandable and separable auxetic honeycomb structure.

[0049] As an optional embodiment, the thickness t of the corrugated plate 1 is equal to the width H of the connecting groove 12, so that when different corrugated plates 1 are embedded and connected with each other through the connecting groove 12, a more stable connection effect is obtained.

[0050] As an optional embodiment, the connecting groove 12 of each column of corrugated plates 1 is located on the same side of the corrugated plate 1, and the connecting groove 12 of each row of corrugated plates 1 is located on the same side of the corrugated plate 1. When the corrugated plates 1 are assembled into an expandable and separable auxetic honeycomb structure, the connecting grooves 12 of each column are located on the same side, and the corrugated plates 1 of each row are located on the same side, which can reduce the complexity of assembly and improve the production efficiency of the expandable and separable auxetic honeycomb structure.

[0051] Example Three

[0052] The energy absorption effect of the expandable and separable auxetic honeycomb structure of the embodiment is simulated by finite element simulation. The expandable and separable auxetic honeycomb structure of the embodiment is formed by 10 rows and 10 columns of corrugated plates 1 in the form of the first unit 1A, the second unit 1B and the third unit 1C in the embodiment two, and is formed by interlaced arrangement. The specific parameters are as follows: the amplitude A of the corrugated plate 1 is 3mm, the wavelength L is 20mm, and the thickness t is 0.5mm. The selected impact object mass m is 300kg, the impact object speed is 20m / s, and the ABAQUS / Explicit solver is used for dynamic simulation.

[0053] Please refer to Figure 7According to the compression ratio-energy curve obtained by numerical simulation, it can be known that the structure can stably and continuously absorb energy under large deformation, and the self-locking system is not damaged and does not occur transverse spatter. It can be seen that the expandable split auxetic honeycomb structure has good stability and energy absorption capacity, and exhibits auxetic performance, can respond to the demand under different actual working conditions, quickly and efficiently build the required structure system in engineering, can be prepared by using traditional process, and has high production efficiency and low cost, and can be widely put into production.

[0054] In addition, the auxetic performance of the auxetic structure is mainly determined by the geometric structure and geometric size, and under the condition that other conditions remain unchanged, the structure size can be appropriately adjusted within the proportion range specified in the utility model, without changing the self-locking effect and auxetic performance of the structure. The idea of free expansion in the structure plane can be extended to more anti-hand auxetic structures by changing the shape of the plate, and more widely applied.

[0055] Although the preferred embodiments of the utility model have been described, those skilled in the art can make further changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the utility model.

[0056] Obviously, those skilled in the art can make various modifications and changes to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and changes of the utility model belong to the scope of the claims of the utility model and its equivalent technologies, the utility model also intends to include these modifications and changes.

Claims

1. An extensible, split, auxetic honeycomb structure, characterized in that, The corrugated plate comprises a plurality of convex portions, a plurality of parallel connecting grooves are arranged on the corrugated plate, the connecting grooves extend from the edges of the corrugated plate to the inside of the corrugated plate, the connecting grooves are arranged on both sides of the convex portions, a plurality of rows of corrugated plates are embedded and connected with a plurality of columns of connecting grooves of the corrugated plates, and the corrugated plates in every two rows and every two columns are embedded and connected to form a space, and each side of the space has one convex portion.

2. The scalable, separable auxetic honeycomb structure of claim 1, wherein, The expandable separated auxetic honeycomb structure comprises a first unit, a second unit and a third unit, the first unit, the second unit and the third unit each comprise at least one space, the first unit forms a corner of the expandable separated auxetic honeycomb structure, the second unit is connected to the first unit and forms an edge of the expandable separated auxetic honeycomb structure, and the third unit is connected to at least the second unit and forms an inside of the expandable separated auxetic honeycomb structure.

3. An expandable, detached auxetic honeycomb structure according to claim 2, wherein, The corrugated plate comprises a first corrugated plate and a second corrugated plate, the first corrugated plate has one cosine waveform, and the second corrugated plate has two continuous cosine waveforms, and the connecting grooves are arranged between adjacent wave crests and wave troughs.

4. An extensible, separable auxetic honeycomb structure according to claim 3, wherein, The first unit comprises two first corrugated plates and two second corrugated plates, any first corrugated plate is embedded and connected to another first corrugated plate and a second corrugated plate, and any second corrugated plate is embedded and connected to another second corrugated plate and a first corrugated plate; The second unit comprises one first corrugated plate and three second corrugated plates, the connecting grooves of the three second corrugated plates are sequentially embedded and connected, and the connecting grooves on both sides of the first corrugated plate are embedded and connected to two opposite second corrugated plates, respectively; The third unit comprises four second corrugated plates which are sequentially embedded and connected through the connecting grooves.

5. An extensible, separable auxetic honeycomb structure according to claim 3, wherein, The wave crests and wave troughs of adjacent two rows or two columns of corrugated plates are oppositely arranged.

6. An extensible, separable auxetic honeycomb structure according to claim 3, wherein, The wavelength L of the corrugated plate and the thickness t of the corrugated plate satisfy L / t>20.

7. The scalable, separable auxetic honeycomb structure of claim 3, wherein, The wavelength L of the corrugated plate and the amplitude A of the corrugated plate satisfy L>4A.

8. The scalable, separable auxetic honeycomb structure of claim 3, wherein, The connecting grooves are arranged along the width of the corrugated plate, and the center line of the connecting grooves intersects with the baseline of the cosine waveform.

9. The scalable, separable auxetic honeycomb structure of claim 1, wherein, The thickness t of the corrugated plate is equal to the width H of the connecting groove.

10. The scalable, separable auxetic honeycomb structure of claim 1, wherein, The connecting grooves of each column of corrugated plates are located on the same side of the corrugated plate, and the connecting grooves of each row of corrugated plates are located on the same side of the corrugated plate.

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