Three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure

Abstract

The utility model relates to the technical field of negative Poisson's ratio lattice structure design, in particular to a three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure which is composed of cell elements of the three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure. Cell elements of the three-dimensional honeycomb chiral mixed negative poisson ratio lattice structure are composed of three-dimensional concave hexagonal honeycomb structure cell elements and three-dimensional four-ligament chiral structure cell elements, and the cell elements of the three-dimensional honeycomb chiral mixed negative poisson ratio lattice structure form the three-dimensional honeycomb chiral mixed negative poisson ratio lattice structure through a periodic array. The three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure phase has excellent bearing capacity and energy absorption capacity, and can generate different types of Poisson's ratio effects in two directions at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to dot matrix structure design technical field especially is a kind of three-dimensional honeycomb chiral mixed negative poisson's ratio dot matrix structure. BACKGROUND

[0002] Negative poisson's ratio effect refers to when being stretched, material expands in the elastic range in transverse direction;And when being compressed, the transverse direction of material shrinks instead.Negative poisson's ratio structure has good shear resistance, fracture resistance, impact resistance, energy absorption and vibration isolation and other mechanical properties, is widely used in various fields, such as aerospace, ship, automobile and other fields.At present, common negative poisson's ratio structures include star, chiral, arrow and concave hexagon.

[0003] Traditional concave hexagonal honeycomb structure has negative poisson's ratio effect, but the rigidity of the structure is small, and the ability to resist deformation is poor, which is not conducive to the application of the structure in some structures that must be strictly limited to deformation.

[0004] The development of 3D printing technology makes it possible to manufacture complex negative poisson's ratio dot matrix structure, which also promotes the research on the basic deformation mechanism of negative poisson's ratio dot matrix structure.

[0005] Common deformation mechanisms of negative poisson's ratio structure: concave mechanism and torsion mechanism.In order to overcome the shortcomings of traditional single negative poisson's ratio structure, innovative structures with novel deformation mechanism can be designed by combining different structure deformation mechanisms.It is worth noting that many deformation mechanism combinations at present are concentrated in two-dimensional structures, and there are few studies on three-dimensional structures, so new mixed three-dimensional unit cells can be designed to form dot matrix structure, which can ensure the negative poisson's ratio effect while improving the rigidity of the structure. UTILITY MODEL CONTENT

[0006] In view of the deficiencies in the prior art, the utility model provides a three-dimensional honeycomb chiral mixed negative poisson's ratio dot matrix structure, compared with traditional concave hexagonal honeycomb structure, the structure adds chiral structure in the concave place of concave hexagonal structure, improves the bearing capacity.Because the torsional deformation mechanism of chiral structure under stress is different from the concave deformation mechanism of honeycomb structure under stress, the structure shows different negative poisson's ratio characteristics in X-Y (Y-X) plane and Y-Z (Z-Y) plane, and due to the symmetry of the structure, the same effect is produced when the structure is subjected to load in X direction or Y direction.

[0007] In an embodiment of the utility model, the three -dimensional honeycomb chiral mixed negative poisson's ratio lattice structure (1) is by three -dimensional honeycomb chiral mixed negative poisson's ratio lattice structure cell (11) is composed, three -dimensional honeycomb chiral mixed negative poisson's ratio lattice structure cell (11) is by three -dimensional recessed hexagonal honeycomb structure cell (111) and three -dimensional four ligament chiral structure cell (112) is composed, three -dimensional honeycomb chiral mixed negative poisson's ratio lattice structure cell (11) is via periodic array formation three -dimensional honeycomb chiral mixed negative poisson's ratio lattice structure.

[0008] In an embodiment of the utility model, the three -dimensional recessed hexagonal honeycomb structure cell (111) is by four identical two -dimensional recessed hexagonal honeycomb cell (1111) in Y-Z face and X-Z face is arranged in proper order and is connected closed.

[0009] In an embodiment of the utility model, the three -dimensional four ligament chiral structure cell (112) includes two square rings (1121) and 8 ligaments (1122) and four inclined bars (1123), wherein two square rings (1121) are connected by four inclined bars (1123), 8 ligaments (1122) are connected with the nodes of two square rings (1121) respectively, and are in the same plane with the connected square (1121) ring.

[0010] In an embodiment of the utility model, the three -dimensional recessed hexagonal honeycomb structure cell (111) is in Y axis direction length L1, in X axis direction length L2, in Z axis direction length H, and the bar diameter d1, wherein L1=L2, the distance h1 of two recessed points of two -dimensional recessed hexagonal honeycomb cell (1111) satisfies 0

[0011] 1. In an embodiment of the utility model, the three -dimensional four ligament chiral structure cell (112) bar diameter is d2, the side length of two square rings (1121) of three -dimensional four ligament chiral structure cell (112) is 1 / 3L1, the vertical distance of two square rings (1121) in Z axis direction is h1, the included angle of 8 ligaments (1122) of three -dimensional four ligament chiral structure cell (112) with the square ring (1121) of interface is θ2, satisfies tan θ2=2, four inclined bars (1123) of three -dimensional four ligament chiral structure cell (112) are used to connect two square rings (1121), and the inclination angle θ3 satisfies tan θ3=3h1 / L1.

[0012] In an embodiment of the utility model, the three -dimensional honeycomb chiral mixed negative poisson's ratio lattice structure cell (11) is through 8 ligaments (1122) of three -dimensional four ligament chiral structure cell (112) with 8 recessed points of three -dimensional recessed hexagonal honeycomb structure cell (111) is connected and is composed.

[0013] In an embodiment of the utility model, the pole diameter d1 of three -dimensional recessed hexagonal honeycomb structure cell (111) is changeable, and three -dimensional recessed hexagonal honeycomb structure cell (111) satisfies the relationship formula: h1+2h2≥H.

[0014] In an embodiment of the utility model, the pole diameter d2 of three -dimensional four ligament chiral structure cell (112) is changeable.

[0015] In an embodiment of the utility model, the three -dimensional honeycomb chiral mixed negative poisson's ratio lattice structure cell (11) is periodically arrayed along X-axis, Y-axis and Z-axis respectively, to form a three -dimensional periodic lattice structure.

[0016] In an embodiment of the utility model, the three -dimensional honeycomb chiral mixed negative poisson's ratio lattice structure (1) is prepared by 3D printing, and the material can be selected from nylon, resin, metal or other composite materials.

[0017] Compared with the prior art, the above technical scheme of the utility model has the following advantages:

[0018] The three -dimensional honeycomb chiral mixed negative poisson's ratio lattice structure (1) has a negative poisson's ratio property, the negative poisson's ratio effect of the X-Y plane of the three -dimensional honeycomb chiral mixed negative poisson's ratio lattice structure (1) is mainly due to the torsion of the chiral structure, and the negative poisson's ratio effect of the Y-Z plane of the three -dimensional honeycomb chiral mixed negative poisson's ratio lattice structure (1) is mainly due to the recessed hexagon, so that the negative poisson's ratio characteristic is generated by coupling two parts, and due to the symmetry, the structure will produce the same effect when subjected to load in the X direction or the Y direction.

[0019] The three -dimensional honeycomb chiral mixed negative poisson's ratio lattice structure (1) can realize poisson's ratio adjustment by changing the length L1, H, h2, the distance h1 of the recessed point, the pole diameter d1 and the pole diameter d2 of the three -dimensional honeycomb negative poisson's ratio lattice structure cell (11). ACCURACY OF DRAWINGS

[0020] In order to make the content of the utility model more easily understood clearly, the utility model is further explained in detail below according to the specific embodiment of the utility model and combines the drawings, wherein

[0021] Figure 1It is the three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure cell schematic diagram provided by the utility model.

[0022] Figure 2 (a) is the two-dimensional concave hexagonal honeycomb structure cell schematic diagram provided by the utility model, Figure 2 (b) is the three-dimensional concave hexagonal honeycomb structure cell schematic diagram provided by the utility model, Figure 2

[0023] (c) is the three-dimensional four-tendon chiral structure cell schematic diagram provided by the utility model.

[0024] Figure 3 (a) is the 4x4x4 three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure schematic diagram provided by the utility model (the cell satisfies h1+h2=H condition), Figure 3 (b) is the three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure Y-Z face schematic diagram provided by the utility model, Figure 3 (c) is the three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure Y-X face schematic diagram provided by the utility model, Figure 3 (d) is the three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure X-Z face schematic diagram provided by the utility model.

[0025] Figure 4 (a) is the 4x4x4 three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure Y-Z face displacement amplification schematic diagram when being subjected to the force in the negative direction of Y axis in the elastic range provided by the utility model, Figure 4 (b) is the 4x4x4 three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure Y-X face displacement amplification schematic diagram when being subjected to the force in the negative direction of Y axis in the elastic range provided by the utility model.

[0026] Figure 5 It is the 4x4x4 three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure and the maximum displacement comparison schematic diagram of traditional three-dimensional honeycomb negative Poisson's ratio lattice structure under the same load provided by the utility model.

[0027] Figure 6 (a)~ Figure 6 (e) is the 4x4x4 three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure Y-Z face change schematic diagram of quasi-static compression simulation provided by the utility model.

[0028] Figure 7 (a)~ Figure 7 (e) is the 4x4x4 three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure Y-X face change schematic diagram of quasi-static compression simulation provided by the utility model.

[0029] Figure 8(a) is the 4x4x4 three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure quasi-static compression simulation stress strain curve schematic diagram provided by the utility model, Figure 8 (b) is the 4x4x4 three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure quasi-static compression simulation specific energy absorption curve schematic diagram provided by the utility model.

[0030] Description of the drawings: 1, a three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure; 11, three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure cell; 111, three-dimensional concave hexagonal honeycomb structure cell; 1111, two-dimensional concave hexagonal honeycomb cell; 112, three-dimensional four-tendon chiral structure cell; 1121, two square rings; 1122, 8 tendons; 1123, four inclined rods. Specific embodiments

[0031] The utility model will be further described below in combination with the drawings and specific embodiments, so that those skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model.

[0032] The utility model embodiment provides a kind of three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure, and the three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure includes three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure cell multiple structures, please refer to Figure 1 、 Figure 2 、 Figure 3 , Figure 1 It is the three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure cell schematic diagram provided by the utility model embodiment, Figure 2 It is important rod piece that is combined into three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure cell, Figure 3 It is the three-dimensional honeycomb negative Poisson's ratio lattice structure and X, Y, Z direction projection schematic diagram thereof provided by the utility model embodiment.

[0033] Refer to Figure 4 As shown, the 4x4x4 three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure formed by periodic combination in X, Y, Z direction, when being subjected to the load of Y axis negative direction, produces deformation, and from deformation trend, it can be seen that, in elastic range, when structure is subjected to load effect, in Y-Z plane, mainly by the negative Poisson's ratio effect of the concave of concave hexagon, in Y-X plane, mainly by the negative Poisson's ratio effect of four-tendon chiral structure torsion, structure overall shrinks inward.

[0034] Refer to Figure 5As shown, in the elastic range, every interval 500N applied force, the new honeycomb structure and conventional honeycomb structure under the same size force, the new honeycomb structure generates smaller maximum displacement, with the increase of the applied force, the absolute value of the maximum displacement difference increases, thus it can be seen that the carrying capacity of the new honeycomb chiral mixed negative Poisson's ratio point lattice structure is stronger.

[0035] Referring to Figure 5 and Figure 6 As shown, using Abaqus / Explicit to simulate the 4x4x4 structure along the negative direction of Y axis quasi-static compression, the size of the periodic cell is: L1=L2=21mm, H=21mm, h1=7mm, d1=d2=1mm. It can be seen that in Y-Z plane and Y-X plane, the structure contracts inward after being compressed, maintaining good negative Poisson's ratio characteristics, and the deformation modes when compressed in two directions are not the same.

[0036] Referring to Figure 7 As shown, the stress-strain curve and specific energy absorption curve of the structure under different h1 conditions are obtained by quasi-static compression, and the size of the periodic cell is: L1=L2=21mm, H=21mm, d1=d2=2mm, and the length of h1 is 1 / 3H(7mm), 1 / 2H(11.5mm), and 2 / 3H(14mm) respectively. It can be seen from the curve that the smaller h1 is, the greater the stiffness is, the stronger the carrying capacity is, the longer the structure densification strain is, the higher the platform stress is, and the more energy absorbed is.

[0037] The embodiments of the utility model are described above in combination with the drawings, the disclosed is only the embodiment of the utility model, but the utility model is not limited to the above-mentioned specific implementation, the above-mentioned specific implementation is only illustrative, and is not restrictive, and the ordinary skilled in the art under the inspiration of the application, without departing from the purpose of the application and the scope of protection of the claims, the obvious changes or changes derived from this still in the protection scope of the utility model creation.

Claims

1. A three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure, characterized by: The three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure (1) is composed of three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice cells (11), and the three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice cells (11) are composed of three-dimensional concave hexagonal honeycomb structure cells (111) and three-dimensional four-tendon chiral structure cells (112); the three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice cells (11) form a three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure through a periodic array.

2. A three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure (1) according to claim 1, characterized in that: The three-dimensional concave hexagonal honeycomb structure cell (111) is composed of four identical two-dimensional concave hexagonal honeycomb cells (1111) arranged in sequence and connected to be closed in the Y-Z plane and the X-Z plane.

3. A three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure (1) according to claim 1, characterized in that: The three-dimensional four-tendon chiral structure cell (112) includes two square rings (1121), eight tendons (1122), and four inclined rods (1123), wherein the two square rings (1121) are connected by the four inclined rods (1123), the eight tendons (1122) are connected to the nodes of the two square rings (1121), and are in the same plane as the connected square rings (1121).

4. A three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure (1) according to claim 2, characterized in that: The three-dimensional concave hexagonal honeycomb structure cell (111) has a length L1 in the Y-axis direction, a length L2 in the X-axis direction, a height H in the Z-axis direction, and a rod diameter d1, wherein L1=L2, the distance h1 between two concave points of the two-dimensional concave hexagonal honeycomb cell (1111) satisfies 0 5. A three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure (1) according to claim 3, characterized in that: The three-dimensional four-tendon chiral structure cell (112) has a rod diameter d2, the length of a side of the two square rings (1121) of the three-dimensional four-tendon chiral structure cell (112) is 1 / 3L1, the vertical distance between the two square rings (1121) in the Z-axis direction is h1, the angle θ2 between the eight tendons (1122) of the three-dimensional four-tendon chiral structure cell (112) and the connected square rings (1121) satisfies tanθ2=2, and the four inclined rods (1123) of the three-dimensional four-tendon chiral structure cell (112) are used to connect the two square rings (1121), and the inclination angle θ3 satisfies tanθ3=3h1 / L1.

6. A three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure (1) according to claim 1, characterized in that: The three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice cell (11) is composed of the eight tendons (1122) of the three-dimensional four-tendon chiral structure cell (112) and the eight concave points of the three-dimensional concave hexagonal honeycomb structure cell (111).

7. A three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure (1) according to claim 4, characterized in that: The rod diameter d1 of the three-dimensional concave hexagonal honeycomb structure cell (111) is variable, and the three-dimensional concave hexagonal honeycomb structure cell (111) satisfies the relationship h1+2h2≥H.

8. A three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure (1) according to claim 5, characterized in that: The rod diameter d2 of the three-dimensional four-tendon chiral structure cell (112) is variable.

9. A three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure (1) according to claim 1, characterized in that: The three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice cell (11) is periodically arrayed along the X-axis, the Y-axis, and the Z-axis to form a three-dimensional periodic lattice structure.

10. A three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure (1) according to claim 1, characterized in that: The three-dimensional honeycomb chiral mixed negative Poisson's ratio lattice structure (1) is prepared by 3D printing, and the material can be selected from nylon, resin, metal or other composite materials.

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