Bistable mechanical interlocking connection system based on bionics

Abstract

The invention provides a bistable mechanical interlocking connection system based on bionics. The bistable mechanical interlocking connection system is characterized by comprising a mother board and a daughter board, wherein the mother board and the daughter board are interlocked through a plurality of interlocking mechanisms; the interlocking mechanism comprises a locking mother piece and a locking son piece, wherein the locking mother piece and the locking son piece can be mutually inserted and locked, the connected edges of the locking mother piece and the locking son piece are mutually attached, and the locking mother piece and the locking son piece are arranged at the end of the mother board body. The locking female part comprises at least two mother plate blades which are arranged in a gourd shape; and one locking mother piece is clamped between the two adjacent locking son pieces. The connecting structure has a bistable mechanical interlocking function when being stressed, has the advantages of novel structure, excellent performance, convenience in assembly and the like, provides a novel and efficient solution for structural connection, and can be widely applied to the fields of machinery, buildings, traffic and the like.

Description

Technical Field

[0001] This invention relates to the field of prefabricated structure technology and material connection, and in particular to a biomimetic bistable mechanical interlocking connection system. Background Technology

[0002] In modern engineering structures, traditional connection methods such as bolting, riveting, and welding are mainly used. While bolting is convenient to install, it is prone to loosening and stress concentration under cyclic loading, severely affecting the reliability and durability of the connection. Although welding achieves high connection strength, the degradation of material properties in the heat-affected zone and residual stress are always difficult to avoid, especially under dynamic loading conditions, where the fatigue performance of welded joints often becomes a weak point in structural safety. While riveting can achieve stable connection quality, its excessive stiffness and insufficient ductility limit its application in applications requiring energy dissipation and vibration reduction. Although high-strength bolt connections developed in recent years have improved the mechanical properties of traditional connections to some extent, they still cannot fundamentally solve the problem of cumulative damage to the connected components under cyclic loading.

[0003] Research shows that the elytra of the ironclad beetle exhibit remarkable mechanical properties, effectively dissipating external energy through a multi-stage deformation mechanism while maintaining high connection strength. The unique feature of this type of biological connection structure lies in its intricate geometry, achieving a perfect balance between connection strength and deformability. This biomimetic connection principle breaks through the design concepts of traditional mechanical connections, pointing the way for the development of novel engineering connection technologies. Especially in fields with stringent requirements for connection performance, such as earthquake-resistant building construction, aerospace, and marine engineering, the development of biomimetic bistable mechanical interlocking connection structures has significant engineering application value. Summary of the Invention

[0004] The purpose of this invention is to provide a biomimetic bistable mechanical interlock connection system, which can effectively improve the load-bearing capacity and energy dissipation capacity of the connection and enhance the overall assembly effect.

[0005] This invention provides a biomimetic bistable mechanical interlocking connection system, characterized in that it comprises a mother plate and a daughter plate;

[0006] The mother plate and the daughter plate are interlocked by a plurality of interlocking mechanisms.

[0007] The aforementioned interlocking mechanism includes a locking female component located at the end of the mother plate body and a locking female component located at the end of the daughter plate body, which are structurally capable of mutual insertion and locking and whose connecting edges fit together.

[0008] The aforementioned locking component includes at least two mother plate blades arranged in a gourd shape.

[0009] Two adjacent locking sub-components clamp a locking mother component between them.

[0010] Furthermore, the present invention provides a biomimetic bistable mechanical interlocking connection system, characterized in that:

[0011] The width of the elliptical mother plate blades on the side closest to the mother plate body gradually decreases towards the width of the elliptical mother plate blades on the side furthest from the mother plate body.

[0012] Furthermore, the present invention provides a biomimetic bistable mechanical interlocking connection system, characterized in that:

[0013] The ratio of the semi-axis of the two adjacent mother plate blades is 1:0.6-0.9.

[0014] Furthermore, the present invention provides a biomimetic bistable mechanical interlocking connection system, characterized in that:

[0015] The ratio of the short semi-axis between two adjacent mother plate blades is 1:0.6-0.9.

[0016] Furthermore, the present invention provides a biomimetic bistable mechanical interlocking connection system, characterized in that:

[0017] The ratio of the short semi-axis to the long semi-axis of the aforementioned elliptical mother plate blade is 1:1.6-1.9.

[0018] Furthermore, the present invention provides a biomimetic bistable mechanical interlocking connection system, characterized in that:

[0019] Adjacent motherboard blades are connected by elliptical arc segments.

[0020] Furthermore, the present invention provides a biomimetic bistable mechanical interlocking connection system, characterized in that:

[0021] The elliptical arc segment is selected from the elliptical arc segment of the mother plate on the side furthest from the mother plate body between the two mother plates.

[0022] Furthermore, the present invention provides a biomimetic bistable mechanical interlocking connection system, characterized in that:

[0023] The aforementioned elliptical arc segment is tangent to the two adjacent mother plate blades;

[0024] The angle between the line connecting the aforementioned tangent point and the center point of the mother plate blade and the major axis of the mother plate blade is α, where α = 20°-35°.

[0025] Furthermore, the present invention provides a biomimetic bistable mechanical interlocking connection system, characterized in that:

[0026] The aforementioned mother plate blades and the adjacent daughter plate blades are interlocked at 20°-35°.

[0027] The function and effects of this invention:

[0028] The technical solution of this invention can be implemented in prefabricated structural engineering to form strong node-weak beam components, ensuring that failure under seismic loads occurs in the potential plastic hinge zone. The blades of the mechanically interlocked connection joint adopt an elliptical geometry, which not only makes the structure more rational but also makes the stress distribution more uniform, avoiding stress concentration. This effectively improves the toughness and energy dissipation capacity of the node and enhances the overall assembly effect. Attached Figure Description

[0029] 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.

[0030] Figure 1 This is a connection diagram according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the mother plate, the main blade of the mother plate, and the secondary blade of the mother plate according to an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the sub-plate, the main blade of the sub-plate, and the secondary blade of the sub-plate according to an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the main blade of the mother plate, the secondary blade of the mother plate, the main blade of the daughter plate, and the secondary blade of the daughter plate in an embodiment of the present invention;

[0034] Figure 5 Design model diagram of a single-weight stable specimen;

[0035] Figure 6 Design model diagram of dual-stability specimen;

[0036] In the diagram, 1 is the mother plate; 2 is the daughter plate; 3 is the main blade of the mother plate; 4 is the secondary blade of the mother plate; 5 is the main blade of the daughter plate; 6 is the secondary blade of the daughter plate; and 7 is the elliptical arc segment. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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 aforementioned 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.

[0040] This embodiment provides a biomimetic bistable mechanical interlocking connection system, characterized by: comprising a mother plate and a daughter plate; the mother plate and daughter plate are interlocked by a plurality of interlocking mechanisms; each interlocking mechanism includes a locking mother piece located at the end of the mother plate body and a locking daughter piece located at the end of the daughter plate body, the locking mother piece comprising at least two gourd-shaped mother plate blades, the number of layers of which can vary according to actual use needs, and two adjacent locking daughter pieces clamping a locking mother piece between them. The width of the elliptical mother plate blades near the mother plate body gradually decreases from the width of the elliptical mother plate blades away from one end. The ratio of the major semi-axis between two adjacent mother plate blades is 1:0.6-0.9, preferably 1:0.7-0.8. The ratio of the minor semi-axis between two adjacent mother plate blades is 1:0.6-0.9, preferably 1:0.7-0.8. The ratio of the minor semi-axis to the major semi-axis of the elliptical mother plate blade is 1:1.6-1.9, preferably 1:1.7-1.8. Adjacent mother plate blades are connected by an elliptical arc segment, which is tangent to the two adjacent mother plate blades. The angle between the line connecting the tangent point and the center point of the mother plate blade and the major axis of the mother plate blade is α, where α = 20°-35°, preferably 25°-30°. The mother plate blade and its adjacent daughter plate blades are interlocked at 20°-35°, preferably 25°-30°.

[0041] The optimal selection experiment is as follows:

[0042] This example uses a two-layer structure as an illustration. The biomimetic bistable mechanical interlocking connection method provided in this experimental example is as follows: Figure 1 As shown, it includes a mother plate 1, a daughter plate 2, a mother plate main blade 3, a mother plate secondary blade 4, a daughter plate main blade 5, and a daughter plate secondary blade 6.

[0043] There are no restrictions on the materials of mother board 1 and daughter board 2.

[0044] like Figure 2 , Figure 3 As shown, in this invention, the splice between the mother plate 1 and the daughter plate 2 adopts a bistable mechanical interlocking connection joint, which adopts a mechanical interlocking connection blade structure. The two sides of the mother plate 1 and the daughter plate 2 are staggered, that is, each mother plate 1 is sandwiched between two adjacent daughter plates 2, and their curved surfaces are completely fitted to achieve a tight fit connection, so as to perform socket installation.

[0045] like Figure 4 As shown, the bistable mechanical interlocking connection joint is in the shape of an elliptical blade. In this embodiment, the number of main blades and secondary blades of the mother plate is 3 to 4, and the shape of all blades is elliptical. Starting from the mother plate body, the width of the main blade of the mother plate is greater than the width of the secondary blade of the mother plate, and their area ratio is 1:0.8.

[0046] The ratio of the minor semi-axis to the major semi-axis of the ellipse for each leaf is 1:1.8.

[0047] After installation, the main blade 3 of the mother plate and the secondary blade 6 of the daughter plate interlock at a 25° angle. This geometry is cast in the factory using specialized molds.

[0048] Comparative Test Example 1. Single-weight stability specimen test

[0049] Adopting such Figure 5 The single-weight stable specimen shown was subjected to performance testing. The specific specimen parameters and main test results are shown in Table 1.

[0050] Table 1 Specimen parameters and main test results

[0051]

[0052]

[0053] The results of single-piece tests revealed that specimen Q2 exhibited the highest load-bearing capacity and energy dissipation capacity, with slightly lower ductility than Q1, while Q3 showed the worst ductility. Overall, the 4-blade specimen demonstrated the best comprehensive performance, followed by the 3-blade specimen.

[0054] Comparative Test Example 2. Dual Stability Specimen Test

[0055] To improve the load-bearing capacity of the interlocking connection, a combination optimization was performed on a single specimen with 3-4 blades, designed as follows: Figure 6 The dual-stability specimen shown was mainly used to verify and determine the size ratio and related angles of the upper and lower blades in the gourd shape. The test results of the specimen are shown in Table 2 below.

[0056] Table 2 Main test results of the specimens

[0057]

[0058] The above specimens are named using "X". A,B+C The naming convention is "-YZ"; where X represents the specimen number, subscript A indicates the number of blades on the mother plate, subscripts B+C represent the blade dimensions at two locations, with B indicating the blade dimension closer to the mother plate and C indicating the blade dimension farther from the mother plate; Y represents the type of elliptical arc segment; and Z represents the included angle. For example, Q 3，1+2 -1-25° indicates that the specimen has 3 blades and is composed of 1 blade and 2 blades. The size of blade 1 is the blade closer to the mother plate, and the blade farther from the mother plate is taken from the elliptical size of blade 2. The elliptical size of blade 1 is taken as the connecting elliptical arc segment. The angle between the center of the arc and the center of the ellipse at the first equilibrium position is 25°, i.e., α.

[0059] The blade dimensions represented by the different numbers are shown in Table 3 below:

[0060] Table 3 Blade Size Parameters

[0061]

[0062] Note: The size ratio of adjacent blades is 0.71-0.8.

[0063] The above comparative experimental study found that:

[0064] (1) The single-weighted stable specimens exhibited the phenomenon of separation between the upper and lower parts during the tensile process, while the double-weighted stable specimens did not show this phenomenon. This indicates that when the double-weighted stable specimens are designed properly, separation can be effectively avoided.

[0065] (2) In the single-stability specimen, the neck of the middle blade at the top of the specimen was not broken, while the neck of the middle blade of the double-stability specimen was broken, indicating that its mechanical interlocking function was effectively played.

[0066] (3) After the single component of the 3-4 blades was optimized into a double component, the load-bearing capacity was improved.

[0067] The above demonstrates the rationality of the ratio (0.71-0.8) of the upper and lower blades of the gourd and the related included angle after dual optimization.

[0068] The function and effect of this embodiment:

[0069] In this embodiment, the mechanically interlocked connecting blades adopt an elliptical geometry, which is more reasonable than the triangular and hemispherical structures commonly found in other land beetles. This results in a more uniform stress distribution, avoids stress concentration, and provides higher strength and toughness.

[0070] When the number of blades is 3 to 4, the peak load, stiffness and toughness at the node are optimal, which can effectively improve the energy dissipation capacity of the node and enhance the overall assembly effect.

[0071] When opposing forces are applied to both ends of the mother and child components, they will not separate before the material is damaged.

[0072] 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 therein. Such 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 biomimetic bistable mechanical interlocking connection system, characterized in that: It includes a mother board and a daughter board; wherein the mother board and the daughter board are interlocked by a plurality of interlocking mechanisms; The interlocking mechanism includes a locking female component located at the end of the mother plate body and a locking female component located at the end of the daughter plate body, which are structurally capable of mutual insertion and locking and whose connected edges fit together. The locking component includes at least two gourd-shaped mother plate blades; The two adjacent locking sub-components clamp a locking mother component between them.

2. The biomimetic bistable mechanical interlocking connection system as described in claim 1, characterized in that: The width of the elliptical mother plate blades on the side closest to the mother plate body gradually decreases from the width of the elliptical mother plate blades on the side furthest from the mother plate body.

3. The biomimetic bistable mechanical interlocking connection system as described in claim 1, characterized in that: The ratio of the semi-axis of the two adjacent mother plate blades is 1:0.6-0.

9.

4. The biomimetic bistable mechanical interlocking connection system as described in claim 1, characterized in that: The ratio of the short semi-axis between two adjacent mother plate blades is 1:0.6-0.

9.

5. The biomimetic bistable mechanical interlocking connection system as described in claim 2, characterized in that: The ratio of the short semi-axis to the long semi-axis of the elliptical mother plate blade is 1:1.6-1.

9.

6. The biomimetic bistable mechanical interlocking connection system as described in claim 1, characterized in that: Adjacent motherboard blades are connected by elliptical arc segments.

7. The biomimetic bistable mechanical interlocking connection system as described in claim 6, characterized in that: The elliptical arc segment is selected from the elliptical arc segment of the mother plate on the side away from the mother plate body between the two mother plates.

8. The biomimetic bistable mechanical interlocking connection system as described in claim 6, characterized in that: The elliptical arc segment is tangent to the two adjacent mother plate blades; The angle between the line connecting the tangent point and the center point of the mother plate blade and the long axis of the mother plate blade is α, where α = 20°-35°.

9. The biomimetic bistable mechanical interlocking connection system as described in claim 1, characterized in that: The mother plate blades are interlocked with the adjacent daughter plate blades at 20°-35°.

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