Three-dimensional chiral twisted metamaterial structure and method of manufacturing the same

Abstract

The application provides a three-dimensional four-chiral compression-torsion metamaterial structure and a manufacturing method thereof, comprising: chiral structure units and connecting panels; the chiral structure units are compression-torsion metamaterial structures, and two adjacent chiral structure units are directly connected or connected through the connecting panels; the chiral structure units have five, one of which is placed in the middle, and the other four chiral structure units are directly connected to the outside of the chiral structure unit. The compression-torsion effect of the application is better than that of the traditional three-dimensional compression-torsion metamaterial, the specific energy absorption effect of the structure in the application is better, the universality is higher, and the stability of the structure is ensured. The torsion of the structure can be adjusted by changing the torsion direction of the four-chiral, and the torsion angle of the structure can be changed by adjusting the geometric parameters of the chiral structure unit. The compression-torsion coupling effect can be realized when the structure is loaded, and the energy absorption effect of the structure is improved to a greater extent.

Description

Technical Field

[0001] This invention relates to the field of mechanical metamaterials technology, and in particular to a three-dimensional four-chiral compressive-torsional metamaterial structure and its fabrication method. Background Technology

[0002] With the rapid development of science and technology, conventional materials found in nature are no longer sufficient for current engineering applications. Therefore, there is a growing search for new materials with superior performance to replace traditional materials. Metamaterials are a class of new materials that achieve control over specific properties by artificially altering their internal structure. In recent years, metamaterials have developed rapidly, giving rise to many metamaterials applicable to different fields, such as mechanical metamaterials, acoustic metamaterials, optical metamaterials, and thermal metamaterials. Among them, mechanical metamaterials possess many unique mechanical properties, such as energy absorption, compression and torsion resistance, and increased stiffness. These materials can be applied in many fields, including protective devices, sensors, biomedicine, and aerospace.

[0003] Although the field of metamaterials has been developing for decades and researchers have made many achievements in this field, there is still little research on compression-torsion metamaterials. Most existing chiral or oblique bar compression-torsion structures cannot simultaneously achieve significant compression-torsion effects and excellent structural stability. The compression-torsion effect of chiral structures is limited, while oblique bar structures are prone to damage, instability, eccentricity, and fracture under load due to their structural characteristics, which affects the compression-torsion effect. Therefore, there is an urgent need for a high-strength three-dimensional compression-torsion structure that has significant and stable compression-torsion effects, as well as a simple structure that is easy to manufacture. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a three-dimensional tetrachiral compression-torsion metamaterial structure and its fabrication method that exhibits significant and stable compression-torsion effects while being simple in structure and easy to manufacture.

[0005] This invention provides a three-dimensional four-chiral compression-torsion metamaterial structure, comprising: chiral structural units and connecting panels; the chiral structural units are compression-torsion metamaterial structures, and adjacent chiral structural units are directly connected or connected through the connecting panels.

[0006] Furthermore, the chiral structural unit has five chiral structural units, one of which is placed in the middle, and the other four chiral structural units are directly connected to the outside of the chiral structural unit, and two adjacent outer chiral structural units are connected to each other through the connecting panel.

[0007] Furthermore, the height and thickness of the chiral structural unit are the same as the height and thickness of the connecting panel.

[0008] Furthermore, the height of both the chiral structural unit and the connecting panel is 15mm.

[0009] Furthermore, the thickness of both the chiral structural unit and the connecting panel is 2mm.

[0010] Furthermore, the three-dimensional tetrachiral compressive-torsional metamaterial structure is square with a side length of 86.27 mm.

[0011] Furthermore, the chiral structural unit includes four arc surfaces and four straight surfaces. One end of the four straight surfaces is connected to a central point in a cross shape, and the four arc surfaces are all connected to the other end of the four straight surfaces along the same side.

[0012] Furthermore, the length of the straight plate is 20mm.

[0013] This invention also provides a method for manufacturing a three-dimensional four-chiral compressive-torsional metamaterial structure, comprising:

[0014] Step S1: Draw an arc on the top reference plane, and draw another identical arc at a set distance a. Connect the two arcs with a straight line to obtain the curved part of the chiral structure unit.

[0015] Step S2: Construct rectangles with side lengths a and b respectively. Align one side of the short side of the rectangle with the straight line of the curved section to obtain one of the rods of the chiral structure. Array four rods in a circle with the midpoint of the short side of the rectangle as the rotation center. Trim the excess line segments to obtain a two-dimensional sketch of a single chiral structure unit.

[0016] Step S3: By stretching the two-dimensional sketch of a single chiral structural unit by H, a three-dimensional model of the chiral structural unit structure is established. The model is then mirrored and arrayed around the perimeter. Four identical structures mirrored and opposite to the central structure are obtained by connecting the sides of two rods, thus completing the modeling of the overall four-chiral structure.

[0017] Step S4: Connect the two adjacent arrays to the sides of the chiral structural units around the perimeter, and stretch the sketch downwards to H to form four connecting rods connecting the four chiral structures, finally obtaining the three-dimensional four-chiral compression-torsion metamaterial structure of the present invention.

[0018] Furthermore, the arc is a sine function curve.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The novel three-dimensional four-chiral compressive-torsional metamaterial proposed in this invention has a compressive-torsional effect that is superior to that of traditional three-dimensional compressive-torsional metamaterials. The structure in this invention has better specific energy absorption effect, higher universality, and at the same time ensures the stability of the structure.

[0021] 2. The torsional effect of the four-chiral compressive-torsional metamaterial of the present invention can be adjusted. The torsion of the structure can be adjusted by changing the torsion direction of the four chiral components, and the torsion angle of the structure can be changed by adjusting the geometric parameters of the chiral structural units.

[0022] 3. The tetrachiral compressive-torsional metamaterial of the present invention can achieve the effect of compression-torsional coupling under load, which greatly improves the energy absorption effect of the structure.

[0023] 4. The maximum torsional angle of the three-dimensional tetrachiral metamaterial of the present invention can be adjusted by the thickness of the beam, the number of cells and the number of layers, and it can produce large-amplitude and stable torsional behavior under pressure.

[0024] 5. The novel three-dimensional four-chiral compressive-torsional metamaterial constructed in this invention has a large range of adjustable torsional angles, which is beneficial for parameter optimization of stability and convenient for application in different occasions.

[0025] 6. The present invention employs a four-chiral connection method, and the direction of the central chiral structure is opposite to that of the four connected chiral structures, which can improve the stability of the structure. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a three-dimensional four-chiral compressive-torsional metamaterial structure according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of a chiral structural unit according to an embodiment of the present invention.

[0029] The attached diagram is labeled as follows:

[0030] 1: Chiral structural unit; 11: Arc surface; 12: Straight plate surface; 2: Connecting panel. Detailed Implementation

[0031] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] like Figure 1 As shown, this embodiment of the invention provides a three-dimensional four-chiral compression-torsion metamaterial structure, including: chiral structural units 1 and connecting panels 2; the chiral structural units 1 are compression-torsion metamaterial structures, and adjacent chiral structural units 1 are directly connected or connected through the connecting panels 2. In a preferred embodiment, there are five chiral structural units 1, with one chiral structural unit 1 placed in the middle, and the other four chiral structural units 1 directly connected to the outer sides of the chiral structural units 1, and adjacent two outer chiral structural units 1 are connected through the connecting panels 2. The compression-torsion effect of this invention is superior to that of traditional three-dimensional compression-torsion metamaterials. The structure in this invention has better specific energy absorption, higher universality, and simultaneously ensures structural stability. This invention can adjust the torsion of the structure by changing the torsion direction of the four chiral units, and can change the torsion angle of the structure by adjusting the geometric parameters of the chiral structural units. Under load, it can achieve a compression-torsion coupling effect, which greatly improves the energy absorption effect of the structure. The four-chiral connection method used in this invention, and the direction of the central chiral structural unit 1 being opposite to the direction of the four connected chiral structural units 1, can improve the stability of the structure.

[0035] In one aspect of the present invention, the height and thickness of the chiral structural unit 1 are the same as the height and thickness of the connecting panel 2. In a specific embodiment, the height of both the chiral structural unit 1 and the connecting panel 2 is 15 mm. The thickness of both the chiral structural unit 1 and the connecting panel 2 is 2 mm. The three-dimensional four-chiral compressive-torsional metamaterial structure is square with a side length of 86.27 mm. It should be noted that the dimensions described here are only a preferred embodiment of the present invention. The maximum torsional angle of the three-dimensional four-chiral metamaterial of the present invention can be adjusted by changing the thickness of the beam, the number of cells, and the number of layers to produce a large-amplitude and stable torsional behavior under compression.

[0036] like Figure 2 As shown, the chiral structural unit 1 of the present invention includes four arc surfaces 11 and four straight surfaces 12. One end of the four straight surfaces 12 is connected to a central point in a cross shape, and the four arc surfaces 11 are all connected to the other end of the four straight surfaces 12 along the same side. The arc of the arc surface 11 is a sine function, and preferably, the length of the straight surface 12 is 20 mm.

[0037] This invention also provides a method for manufacturing a three-dimensional four-chiral compressive-torsional metamaterial structure, comprising:

[0038] Step S1: Draw an arc on the top reference plane, and draw another identical arc at a set distance a. Connect the two arcs with a straight line to obtain the curved part of the chiral structure unit.

[0039] Step S2: Construct rectangles with side lengths a and b respectively. Align one side of the short side of the rectangle with the straight line of the curved section to obtain one of the rods of the chiral structure. Array four rods in a circle with the midpoint of the short side of the rectangle as the rotation center. Trim the excess line segments to obtain a two-dimensional sketch of a single chiral structure unit.

[0040] Step S3: By stretching the two-dimensional sketch of a single chiral structural unit by H, a three-dimensional model of the chiral structural unit structure is established. The model is then mirrored and arrayed around the perimeter. Four identical structures mirrored and opposite to the central structure are obtained by connecting the sides of two rods, thus completing the modeling of the overall four-chiral structure.

[0041] Step S4: Connect the two adjacent arrays to the sides of the chiral structural units around the perimeter, and stretch the sketch downwards to H to form four connecting rods connecting the four chiral structures, finally obtaining the three-dimensional four-chiral compression-torsion metamaterial structure of the present invention.

[0042] This method facilitates the design and operation of three-dimensional four-chiral compressive-torsional metamaterial structures, resulting in stable structures. The central structure and the surrounding unit cells exhibit opposite torsional directions, with adjustable torsional angles. The torsional angle can be altered by adjusting the thickness of the connecting beams and the number of unit cells. The circular arcs represent sinusoidal curves.

[0043] The three-dimensional four-chiral compressive-torsional metamaterial structure fabricated using the method of this invention exhibits superior compressive-torsional performance compared to traditional three-dimensional compressive-torsional metamaterials. The structure in this invention demonstrates better specific energy absorption, greater versatility, and simultaneously ensures structural stability. This invention allows adjustment of the structure's torsion by changing the direction of the four chiral twists, and the torsional angle can be altered by adjusting the geometric parameters of the chiral structural units. Under load, it achieves a compression-torsional coupling effect, significantly enhancing the structure's energy absorption. The four-chiral connection method employed in this invention, with the central chiral structural unit 1 oriented opposite to the four connected chiral structural units 1, further improves the structure's stability.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A three-dimensional tetrachiral compressive-torsional metamaterial structure, characterized in that, include: Chiral structural unit (1) and connecting panel (2); The chiral structural unit (1) is a compression-torsion metamaterial structure; The chiral structural unit (1) has five units, one of which is located in the middle, and the other four are directly connected to the outside of the middle chiral structural unit (1). The two adjacent outer chiral structural units (1) are connected by the connecting panel (2). The direction of the middle chiral structural unit (1) is opposite to the direction of the four connected chiral structural units (1). The chiral structural unit (1) includes four arc surfaces (11) and four straight surfaces (12). One end of the four straight surfaces (12) is connected to the center point in a cross shape, and the four arc surfaces (11) are connected to the other end of the four straight surfaces (12) along the same side.

2. The three-dimensional tetrachiral compressive-torsional metamaterial structure according to claim 1, characterized in that, The height and thickness of the chiral structural unit (1) are the same as the height and thickness of the connecting panel (2).

3. The three-dimensional tetrachiral compressive-torsional metamaterial structure according to claim 2, characterized in that, The height of both the chiral structural unit (1) and the connecting panel (2) is 15mm.

4. The three-dimensional tetrachiral compressive-torsional metamaterial structure according to claim 2, characterized in that, The thickness of both the chiral structural unit (1) and the connecting panel (2) is 2 mm.

5. The three-dimensional tetrachiral compressive-torsional metamaterial structure according to claim 1, characterized in that, The three-dimensional tetrachiral compressive-torsional metamaterial structure is square with a side length of 86.27 mm.

6. The three-dimensional tetrachiral compressive-torsional metamaterial structure according to claim 1, characterized in that, The length of the straight plate (12) is 20mm.

7. A method for manufacturing a three-dimensional four-chiral compressive-torsional metamaterial structure according to any one of claims 1 to 6, characterized in that, include: Step S1: Draw an arc on the top reference plane, and draw another identical arc at a set distance a. Connect the two arcs with a straight line to obtain the curved part of the chiral structure unit. Step S2: Construct rectangles with side lengths a and b respectively. Align one side of the short side of the rectangle with the straight line of the curved section to obtain one of the rods of the chiral structure. Array four rods in a circle with the midpoint of the short side of the rectangle as the rotation center. Trim the excess line segments to obtain a two-dimensional sketch of a single chiral structure unit. Step S3: By stretching the two-dimensional sketch of a single chiral structural unit by H, a three-dimensional model of the chiral structural unit structure is established. The model is then mirrored and arrayed around the perimeter. Four identical structures mirrored and opposite to the central structure are obtained by connecting the sides of two rods, thus completing the modeling of the overall four-chiral structure. Step S4: Connect two adjacent arrays to the sides of the chiral structural units around the perimeter, and stretch the sketch downwards to H to form four connecting rods connecting the four chiral structures, finally obtaining the three-dimensional four-chiral compression-torsion metamaterial structure.

8. The method for manufacturing a three-dimensional four-chiral compressive-torsional metamaterial structure according to claim 7, characterized in that, The arc is a sine function curve.

Images