A negative Poisson's ratio metamaterial cell structure based on a two-rod and two-cable tension structure

Abstract

This invention discloses a negative Poisson's ratio metamaterial cellular structure based on a two-rod, two-cable tensioned structure. The structure comprises two T-shaped rods, a sliding compression elastic component, and a tension elastic component. The two T-shaped rods are symmetrically arranged; the middle portions of the two T-shaped rods are slidingly connected by the sliding compression elastic component; and the corresponding sides of the two T-shaped rods are connected by the tension elastic component. This invention utilizes the lightweight, self-stabilizing, adaptive, and stiffness-adjustable characteristics of the tensegrity structure, combined with the metamaterial cellular structure, to enhance stiffness and self-stability, thereby improving mechanical properties.

Description

Technical Field

[0001] The present invention relates to the technical field of negative Poisson's ratio metamaterial structures, and more particularly to a negative Poisson's ratio metamaterial cell structure based on a two-rod and two-cable tensioning structure. Background Art

[0002] Negative Poisson's ratio metamaterials, a key branch of mechanical metamaterials, have become a highly sought-after new material due to their negative Poisson's ratio effect, which can enhance mechanical properties such as shear modulus, fracture toughness, thermal shock strength, and indentation resistance. As a non-natural material, metamaterials derive their properties from their structure rather than their chemical composition.

[0003] Currently, a variety of metamaterial cell structures have been proposed to achieve negative Poisson's ration characteristics, but they all have unreasonable geometric and topological shape designs, poor self-stability, and their rigidity and mechanical properties need to be improved.

[0004] Therefore, providing a negative Poisson's ratio metamaterial cell structure based on a two-rod and two-cable tensioning structure with improved mechanical properties is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a negative Poisson's ratio metamaterial cellular structure based on a two-rod and two-cable tensioning structure, which has the characteristics of programmability, stability and adjustable stiffness.

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

[0007] A negative Poisson's ratio metamaterial cell structure based on a two-rod, two-cable tensioning structure includes two T-shaped rods, a sliding compressive elastic component, and a tensile elastic component. The two T-shaped rods are symmetrically distributed; the middle portions of the two T-shaped rods are slidingly connected via the sliding compressive elastic component; and the corresponding side portions of the two T-shaped rods are connected via the tensile elastic component.

[0008] By adopting the above technical solution, the beneficial effects of the present invention are:

[0009] By utilizing the characteristics of the tensegrity structure, such as light weight, self-stability, self-adaptation and adjustable stiffness, and combining it with the metamaterial cellular structure, it is possible to enhance the stiffness and self-stability and improve the mechanical properties.

[0010] Furthermore, the two T-shaped rods are respectively a first T-shaped rod and a second T-shaped rod, the first T-shaped rod includes a first H-shaped frame and a first connecting rod connected as one, two symmetrically distributed first grooves are opened on both sides of the first H-shaped frame with the first connecting rod as the center, and a first mounting hole is opened in each first groove along the thickness direction of the first H-shaped frame; the extended end of the first connecting rod is provided with a through hole along its length direction; the second T-shaped rod includes a second H-shaped frame and a second connecting rod connected as one, two symmetrically distributed second grooves are opened on both sides of the second H-shaped frame with the second connecting rod as the center, and a second mounting hole is opened in each second groove along the thickness direction of the second H-shaped frame, and the second mounting holes on the same side correspond to the positions of the first mounting holes; the extended end of the second connecting rod is provided with a countersunk hole along its length direction, and the countersunk hole corresponds to the position of the through hole.

[0011] Furthermore, the sliding pressure elastic component includes a sliding coupling shaft and a pressure spring, one end of the sliding coupling shaft extends into the through hole and is slidingly connected thereto, and the other end of the sliding coupling shaft extends into the countersunk hole and is fixedly connected thereto; the pressure spring is sleeved on the sliding coupling shaft, and the two ends of the pressure spring are respectively in contact with the extended end portion of the first connecting rod and the extended end portion of the second connecting rod.

[0012] Furthermore, each of the tension elastic components includes two fixed shafts and a tension spring, and the two fixed shafts are respectively fixed on the first mounting hole and the second mounting hole; and both ends of the tension spring are respectively fixedly connected to the two fixed shafts.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is that, under the constraints of the compression spring and the tension spring, a balanced state is always reached at one position, thereby improving self-stability.

[0014] Furthermore, a third mounting hole is provided in each first groove along the thickness direction of the first H-shaped frame, and the third mounting hole is located on the outside of the first mounting hole; a fourth mounting hole is provided in each second groove along the thickness direction of the second H-shaped frame, and the fourth mounting hole is located on the outside of the second mounting hole, and the third mounting hole and the fourth mounting hole on the same side are positioned correspondingly; a linkage coupling shaft is fixed in each of the third mounting hole and the fourth mounting hole.

[0015] Furthermore, the number of the through holes is two, and the two through holes are spaced apart along the thickness direction of the first connecting rod; the number of the countersunk holes is two, and the two countersunk holes are spaced apart along the thickness direction of the second connecting rod; the number of the sliding pressure elastic components is two, and one end of the two sliding pressure elastic components is respectively slidably connected to the two through holes, and the other end of the two sliding pressure elastic components is respectively fixedly connected to the two countersunk holes.

[0016] The beneficial effect of adopting the above further technical solution is that, under the joint action of the two sliding coupling shafts, the rotation of the first T-shaped rod in the axial direction of the sliding coupling shaft can be restricted, making the structure more stable.

[0017] Furthermore, the sliding coupling shaft is interference-connected with the counterbore.

[0018] Furthermore, the length of the fixed shaft and the length of the linkage coupling shaft are both the same as the thickness of the H-shaped frame; the two fixed shafts are respectively interference connected with the first mounting hole and the second mounting hole; the two linkage coupling shafts are respectively interference connected with the third mounting hole and the fourth mounting hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 The accompanying drawing is a front view of a negative Poisson's ratio metamaterial cell structure based on a two-rod and two-cable tensioning structure provided by the present invention;

[0021] Figure 2 The accompanying drawing is an axial side view of a negative Poisson's ratio metamaterial cell structure based on a two-rod and two-cable tensioning structure provided by the present invention;

[0022] Figure 3 The accompanying drawing is an axial cross-sectional view of a negative Poisson's ratio metamaterial cell structure based on a two-rod and two-cable tensioning structure provided by the present invention. DETAILED DESCRIPTION

[0023] 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.

[0024] like Figure 1-3 As shown, an embodiment of the present invention discloses a negative Poisson's ratio metamaterial cellular structure based on a two-rod, two-cable tensile structure. The structure comprises two T-shaped rods 1, a sliding compressive elastic component 2, and a tensile elastic component 3. The two T-shaped rods 1 are symmetrically distributed; the middle portions of the two T-shaped rods 1 are slidingly connected by the sliding compressive elastic component 2; and the corresponding sides of the two T-shaped rods 1 are connected by the tensile elastic component 3. This invention utilizes the lightweight, self-stabilizing, adaptive, and stiffness-adjustable characteristics of the tensegrity structure, combined with the metamaterial cellular structure, to enhance stiffness and self-stability, thereby improving mechanical properties.

[0025] Specifically, the two T-shaped rods 1 are respectively a first T-shaped rod 11 and a second T-shaped rod 12. The first T-shaped rod 11 includes a first H-shaped frame 111 and a first connecting rod 112 connected as one body. Two symmetrically distributed first grooves are provided on both sides of the first H-shaped frame 111 with the first connecting rod 112 as the center. A first mounting hole 1111 is provided in each first groove along the thickness direction of the first H-shaped frame 111; a through hole 1121 is provided along the length direction of the first connecting rod 112 at an extended end portion thereof. In this embodiment, the number of the through holes 1121 is two, and the two through holes 1121 are spaced apart along the thickness direction of the first connecting rod 112; the second T-shaped rod 12 includes A second H-shaped frame 121 and a second connecting rod 122 are connected as a whole. Two symmetrically distributed second grooves are provided on both sides of the second H-shaped frame 121 with the second connecting rod 122 as the center. A second mounting hole 1211 is provided in each second groove along the thickness direction of the second H-shaped frame 121, and the second mounting hole 1211 and the first mounting hole 1111 on the same side correspond to each other. A countersunk hole 1221 is provided along the length direction of the second connecting rod 122 at the extended end, and the countersunk hole 1221 corresponds to the position of the through hole 1121. In this embodiment, the number of the countersunk holes 1221 is two, and the two countersunk holes 1221 are spaced apart along the thickness direction of the second connecting rod 122.

[0026] Specifically, there are two sliding pressure elastic components 2, one end of each of which is slidably connected to the two through holes 1121, and the other end of each of which is fixedly connected to the two countersunk holes 1221. Each sliding pressure elastic component 2 includes a sliding coupling shaft 21 and a pressure spring 22. One end of the sliding coupling shaft 21 extends into the through hole 1121 and is slidably connected thereto, while the other end of the sliding coupling shaft 21 extends into the countersunk hole 1221 and is fixedly connected thereto. Therefore, under the joint action of the two sliding coupling shafts 21, the rotation of the first T-shaped rod 11 in the axial direction of the sliding coupling shaft 21 can be restricted, making the structure more stable. In this embodiment, the sliding coupling shaft 21 is interference-connected with the countersunk hole 1221; the pressure spring 22 is fitted onto the sliding coupling shaft 21, and the two ends of the pressure spring 22 are respectively in contact with the extended end of the first connecting rod 112 and the extended end of the second connecting rod 122. Under the action of external force, the cell structure will deform in the axial direction of the sliding coupling shaft 21.

[0027] Specifically, each tensile elastic component 3 includes two fixed shafts 31 and a tensile spring 32. The two fixed shafts 31 are respectively fixed on the first mounting hole 1111 and the second mounting hole 1211. In this embodiment, the length of the fixed shaft 31 is the same as the thickness of the H-shaped frame (the first H-shaped frame 111 and the second H-shaped frame 121). The two fixed shafts 31 are respectively interference-connected with the first mounting hole 1111 and the second mounting hole 1211; the two ends of the tensile spring 32 are respectively fixedly connected to the two fixed shafts 31. When the stiffness coefficients of the compression spring 22 and the tensile spring 32 are determined, the cell structure will always reach a balanced state at one position.

[0028] Specifically, a third mounting hole 1112 is provided in each first groove along the thickness direction of the first H-shaped frame 111, and the third mounting hole 1112 is located on the outside of the first mounting hole 1111; a fourth mounting hole 1212 is provided in each second groove along the thickness direction of the second H-shaped frame 121, and the fourth mounting hole 1212 is located on the outside of the second mounting hole 1211, and the third mounting hole 1112 and the fourth mounting hole 1212 on the same side are positioned correspondingly; a linkage coupling shaft 4 is fixed in the third mounting hole 1112 and the fourth mounting hole 1212. In this embodiment, the length of the linkage coupling shaft 4 is the same as the thickness of the H-shaped frame (the first H-shaped frame 111 and the second H-shaped frame 121), and the two linkage coupling shafts 4 are interference connected with the third mounting hole 1112 and the fourth mounting hole 1212, respectively.

[0029] 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.

[0030] 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 negative Poisson's ratio metamaterial cell structure based on a two-rod and two-cable tension structure, characterized in that: It comprises a sliding compression elastic component, a tension elastic component and two T-shaped rods, wherein the two T-shaped rods are symmetrically distributed; the middle parts of the two T-shaped rods are slidingly connected by the sliding compression elastic component; and the corresponding side parts of the two T-shaped rods are connected by the tension elastic component; The two T-shaped rods are respectively a first T-shaped rod and a second T-shaped rod, the first T-shaped rod comprising a first H-shaped frame and a first connecting rod connected as one body, the first H-shaped frame forming the head of the first T-shaped rod; two symmetrically distributed first grooves are formed on both sides of the first H-shaped frame with the first connecting rod as the center, and a first mounting hole is formed in each of the first grooves along the thickness direction of the first H-shaped frame; a through hole is formed in the extended end of the first connecting rod along its length direction; the second T-shaped rod comprises a second H-shaped frame and a second connecting rod connected as one body, the second H-shaped frame forming the head of the second T-shaped rod, two symmetrically distributed second grooves are formed on both sides of the second H-shaped frame with the second connecting rod as the center, a second mounting hole is formed in each of the second grooves along the thickness direction of the second H-shaped frame, and the second mounting holes on the same side correspond to the positions of the first mounting holes; the extended end of the second connecting rod is provided with a countersunk hole along its length direction, and the countersunk hole corresponds to the position of the through hole; The sliding pressure elastic component includes a sliding coupling shaft and a pressure spring, one end of the sliding coupling shaft extends into the through hole and is slidably connected thereto, and the other end of the sliding coupling shaft extends into the countersunk hole and is fixedly connected thereto; the pressure spring is sleeved on the sliding coupling shaft, and both ends of the pressure spring are in contact with the extended end portion of the first connecting rod and the extended end portion of the second connecting rod respectively; Each of the tension elastic components includes two fixed shafts and a tension spring, the two fixed shafts are respectively fixed on the first mounting hole and the second mounting hole; the two ends of the tension spring are respectively fixedly connected to the two fixed shafts; A third mounting hole is provided in each of the first grooves along the thickness direction of the first H-shaped frame, and the third mounting hole is located on the outside of the first mounting hole; a fourth mounting hole is provided in each of the second grooves along the thickness direction of the second H-shaped frame, and the fourth mounting hole is located on the outside of the second mounting hole, and the third mounting hole and the fourth mounting hole on the same side are positioned correspondingly; a linkage coupling shaft is fixed in each of the third mounting hole and the fourth mounting hole.

2. The negative Poisson's ratio metamaterial cell structure based on a two-rod and two-cable tensioning structure according to claim 1, characterized in that: There are two through holes, and the two through holes are spaced apart along the thickness direction of the first connecting rod; there are two countersunk holes, and the two countersunk holes are spaced apart along the thickness direction of the second connecting rod; there are two sliding pressure elastic components, and one end of the two sliding pressure elastic components is respectively slidably connected to the two through holes, and the other end of the two sliding pressure elastic components is respectively fixedly connected to the two countersunk holes.

3. The negative Poisson's ratio metamaterial cell structure based on a two-rod and two-cable tensioning structure according to claim 1, characterized in that: The sliding coupling shaft is interference-connected with the counterbore.

4. The negative Poisson's ratio metamaterial cell structure based on a two-rod and two-cable tensioned structure according to claim 1, characterized in that: The length of the fixed shaft and the length of the linkage coupling shaft are both the same as the thickness of the H-shaped frame; the two fixed shafts are respectively interference connected with the first mounting hole and the second mounting hole; the two linkage coupling shafts are respectively interference connected with the third mounting hole and the fourth mounting hole.

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