A thin-walled compression-resistant energy-absorbing device imitating the vein structure of a king lotus leaf and a mounting method thereof

Abstract

The application discloses a thin-wall compression-resistant energy-absorbing device simulating a vein structure of a king lotus leaf and a mounting method thereof, and the device comprises a plurality of three-level tree-shaped substructures, a cable, an outer thin-wall cylinder and a central shaft. The three-level tree-shaped branch substructures are uniformly arranged in the outer thin-wall cylinder around the central shaft, the angles of the branches of each level are the same, and the angle bisector is coincident with the extension line of the branch of the upper level. The fractal structure uniformly transmits the load to the outer thin-wall cylinder layer by layer. The cable is located at the median line and the bottom edge of the second-level branch of the substructure, and the cable restricts the out-of-plane deformation of each tree-shaped branch substructure. The cables are connected between the substructures, the stability of the whole is ensured, and the force transmission path in each tree-shaped branch member is not damaged. The structure has high load-bearing capacity, good stability and is beneficial to resisting local damage. The outer thin-wall cylinder and each tree-shaped branch member are connected through buckling, so that each component is easy to replace when damaged. The cable is connected through a welding pull ring at the connection position of the substructure and the cable. The construction is simple, and the assembly efficiency is high.

Description

Technical Field

[0001] This invention relates to the fields of vehicle engineering, building engineering and aerospace, and particularly to a pressure-resistant energy-absorbing device and a corresponding assembly manufacturing method, which can be specifically applied to the design of automotive anti-collision energy-absorbing boxes, building supports, manned spacecraft return capsules, etc. Background Technology

[0002] Technological advancements have placed higher demands on structural engineering: while meeting requirements for strength, stiffness, and stability, it is necessary to further reduce material usage and achieve more functions to enhance overall value. In recent years, various manufacturing sectors have seen a significant demand for lightweight, high-strength thin-walled composite structures. For example, aircraft fuselages and spacecraft reentry capsules require high compressive strength and impact resistance to protect personnel and precision equipment, while minimizing weight and energy consumption to improve economic efficiency. Similarly, in the military equipment sector, higher demands are placed on weaponry; lightweight materials, rational structures, ease of assembly, improved energy absorption, and reduced costs have become increasingly important.

[0003] While lightweight, high-strength thin-walled composite structures offer numerous advantages, certain challenges remain in their actual manufacturing. Complex structures often require complex fabrication processes. Although technologies such as 3D printing exist, their application is currently hampered by limitations in materials, precision, and cost. Assembled assembly may remain the best fabrication solution for such structures (or devices) for a considerable period.

[0004] In recent years, bionics has been applied to various disciplines. The biological structures in nature have provided new ideas and theories for human technological innovation. There have been reports such as "humans carrying giant water lilies". Through observation, it has been found that the vein structure on the back of the giant water lily gives the leaves excellent load-bearing and impact resistance. The branching structure of the veins and the sickle-shaped septa between the main veins form an excellent network skeleton. The veins on the back of the leaves are thick and raised, and are distributed radially from the center to the periphery, showing radial symmetry. The main vein extends to the end, from thick to thin, ensuring the integrity of the leaves and improving their ability to resist local damage, thus providing stability. This has important reference significance for the design of related engineering structures.

[0005] However, there is currently no thin-walled pressure-resistant energy-absorbing device in this field that uses Victoria amazonica as a biomimetic prototype. Summary of the Invention

[0006] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a thin-walled compressive energy absorption device with a structure that mimics the vein structure of Victoria amazonica leaves. This structure has high load-bearing capacity, good stability, and is conducive to resisting local damage. It can be used in fields such as vehicle engineering, construction engineering, and aerospace.

[0007] Another objective of this invention is to provide an installation method for a thin-walled pressure-resistant energy-absorbing device with a structure that mimics the veins of a Victoria amazonica leaf, which is simple to construct and has high assembly efficiency.

[0008] Technical Solution: The thin-walled pressure-resistant energy-absorbing device with a mimicking the vein structure of Victoria amazonica leaves, as described in this invention, consists of multiple multi-level tree-like branch substructures, cables (2), an outer thin-walled cylinder (3), and a central shaft (4). The multiple three-level tree-like branch substructures (1) are evenly arranged around the central shaft (4) and connected to the central shaft (4) via buckles (104) and (401). Externally, they are connected to the outer thin-walled cylinder (3) via buckles (105) and (302) to form a whole. The multi-level tree-like branch substructure is a three-level tree-like branch substructure (1), with welded rings (106) on both sides of its outer surface for installing cables (2). The cables (2) are arranged in the latitudinal direction of the energy-absorbing device. The cables (2) are respectively set inside the tree-like branch substructure (1) and between each substructure, and there is no prestress in the cables.

[0009] The three-level tree-like branch substructure (1) has three levels of branching: I (101), II (102), and III (103). The angle of each branch is the same, which is 60°. The angle bisector coincides with the extension line of the previous level branch, forming a fractal structure.

[0010] The thickness of each branch in the three-level tree-like substructure decreases progressively from the inside out, and is set to 4:3:2 according to the actual proportion of the plant.

[0011] The aforementioned three-level tree-like branch substructure has six branches evenly spaced around the central axis.

[0012] The three-level tree-like branch substructure is designed with snap-fit ​​structures (104) and (105) at the end for connection with the surface groove (401) of the central shaft and the surface groove (302) of the outer thin-walled cylinder. A ring (106) is welded at the in-plane cable connection for cable installation.

[0013] The outer thin-walled cylinder has a face groove (302) on its inner side for connecting with the snap-fit ​​structure (105) of the three-level tree-like branch substructure.

[0014] The central shaft has an overall hexagonal prism shape, with face grooves (401) on each face.

[0015] The cables are divided into cables within the substructure and cables between substructures. Cables within the substructure are located at the midline MN and the base CE of the triangle BCE region formed by branch II (102). Cables between substructures are located at the midline and base of triangles ABF and CDE, and at the line connecting the midpoints of BC and FE. There is no prestress within the cables. When the device height is less than twice the length of the first-level branch (101), the cables are arranged at half the height. When the device height is greater than twice the length of the first-level branch (101), one set of cables is arranged every first-level branch length.

[0016] The installation method of the thin-walled pressure-resistant energy-absorbing device with the imitation Victoria water lily leaf vein structure includes the following steps:

[0017] (1) Install cables within the three-level tree-like branch substructure;

[0018] (2) Connect the three-level tree-like branch substructure with cables to the central axis to form a whole;

[0019] (3) Install cables between the three-level tree-like branch substructures to connect the substructures into a whole;

[0020] (4) Align the substructure bayonet with the bayonet of the outer thin-walled cylinder, push it into the outer thin-walled cylinder, and complete the installation of the energy absorption device.

[0021] Beneficial effects: Compared with the prior art, the present invention has the following characteristics:

[0022] (1) The thin-walled pressure-resistant energy-absorbing device of the present invention, which mimics the vein structure of Victoria amazonica leaves, takes the veins of Victoria amazonica leaves as its biomimetic prototype and makes full use of the structural advantages of the veins on the back of the leaves. The device consists of multiple three-level tree-like substructures, cables, an outer thin-walled cylinder, and a central shaft. The branching angles of each level of the three-level tree-like substructures are the same, and the angle bisectors coincide with the extension lines of the previous level branch, which is a fractal structure. This fractal structure uniformly transfers the load layer by layer to the outer thin-walled cylinder, effectively distributing the load and making full use of the material properties.

[0023] (2) The device of the present invention fully utilizes the tension deformation performance of the flexible cables between branches, possessing excellent load-bearing capacity and strong integrity, making it suitable for resisting localized damage and exhibiting strong overall stability. The cables are located at the midline and bottom edge of the second-level branches of the substructure, constraining the out-of-plane deformation of each tree-like branch substructure. The cables connect the substructures, ensuring overall stability and preventing disruption of the force transmission paths within each tree-like branch component. The overall structure possesses high load-bearing capacity and good overall stability, which is beneficial for resisting localized damage.

[0024] (3) The outer thin-walled cylinder is connected to each tree-like branch component by snap-fit, making it easy to replace any damaged parts. At the connection between the substructure and the cable, welded rings are used to connect the cable. Easy to assemble and highly efficient. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a thin-walled pressure-resistant energy-absorbing device that mimics the vein structure of a Victoria amazonica leaf.

[0026] Figure 2 This is a schematic diagram of the cross-section of a thin-walled compressive energy absorption device that mimics the vein structure of a Victoria amazonica leaf.

[0027] Figure 3 This is a schematic diagram of a three-level tree-like branching substructure 1;

[0028] Figure 4 It is the proportional relationship between the diameters of the three-layered tree-like branches and their corresponding latitudinal circles;

[0029] Figure 5 This is a schematic diagram of the outer thin-walled cylinder 3;

[0030] Figure 6 This is a schematic diagram of the surface groove II structure on the outer thin-walled cylinder;

[0031] Figure 7 This is a schematic diagram of the central axis structure;

[0032] Figure 8 This is a schematic diagram of the compression test loading.

[0033] Figure 9 This is a flowchart of the assembly-based manufacturing method.

[0034] Explanation of the main markings in the attached diagram:

[0035] 1-Three-level tree-like branching substructure, 2-Cable, 3-Outer thin-walled cylinder, 4-Central axis;

[0036] 104-Snap-on I, 105-Snap-on II, 106-Welded Ring, 401-Surface Groove I, 302-Surface Groove II;

[0037] 101 - Three-level tree-like branching substructure I, 102 - Three-level tree-like branching substructure II, 103 - Three-level tree-like branching substructure III. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings:

[0039] In the description of this invention, it should be clarified that terms indicating orientation, such as up, down, inside, outside, and latitude, are descriptions of the relative positions of the components in the accompanying drawings, and do not mean that the components must be set according to that orientation in actual application.

[0040] Example 1

[0041] like Figure 1 , 2 As shown, a thin-walled pressure-resistant energy-absorbing device with a structure mimicking the veins of a Victoria amazonica leaf consists of a three-level tree-like branch structure 1, a cable 2, an outer thin-walled cylinder 3, and a central shaft 4.

[0042] The three-level tree-like branch substructure 1 is evenly arranged around the central axis 4 inside the outer thin-walled cylinder 3. The three-level tree-like branch substructure is designed with snap fasteners I and II at its ends. Surface grooves I and II are respectively provided on the outer periphery of the central axis and inside the outer thin-walled cylinder. One end of the three-level tree-like branch substructure is connected to the central axis 4 through snap fastener I 104 and surface groove I 401, and the far end is connected to the outer thin-walled cylinder 3 through snap fastener II 105 and surface groove II 302 to form a whole.

[0043] In this embodiment, a three-level tree-like branch substructure is formed, with six branches evenly arranged around the central axis.

[0044] The three-level tree-like branch substructure 1 has welded rings 106 on both sides of its outer surface for installing cables 2. The cables 2 are arranged in the latitudinal direction of the energy absorption device. The cables 2 are respectively set inside the tree-like branch substructure 1 and between each substructure. No prestress is required when tensioning the cables.

[0045] like Figure 3 , 4 As shown, the three-level tree-like branching substructure 1 has three levels of branching: three-level tree-like branching substructure I 101, three-level tree-like branching substructure II 102, and three-level tree-like branching substructure III 103. The branching angles of each level are the same, all 60°, and the angle bisectors coincide with the extension lines of the previous level branch, forming a fractal structure. Furthermore, the thickness of each branch in the three-level tree-like branching substructure decreases progressively from the inside out, with the ratio set to 4:3:2.

[0046] The aforementioned cables are divided into cables within the three-level tree-like branch substructures and cables between substructures. Cables within the substructures are located at the midline MN and base CE of the triangle BCE region formed by branch II 102. Cables between substructures are located at the midline and base of triangles ABF and CDE, and at the line connecting the midpoints of BC and FE. There is no prestress within the cables. When the device height is less than twice the length of the first-level branch 101, the cables are arranged at half the height. When the device height is greater than twice the length of the first-level branch 101, one set of cables is arranged every other first-level branch length.

[0047] like Figure 8 As shown, the central shaft has an overall hexagonal prism shape, with face grooves I401 on each face.

[0048] like Figure 9As shown, the prefabricated engineering method of the thin-walled pressure-resistant energy-absorbing device with the imitation Victoria water lily leaf vein structure includes the following steps:

[0049] (1) First, install the cables within the three-level tree-like branch substructure;

[0050] (2) Connect the three-level tree-like branch substructure with cables to the central axis to form a whole;

[0051] (3) Install cables between the three-level tree-like branch substructures to connect the substructures into a whole;

[0052] (4) Align the substructure bayonet with the bayonet of the outer thin-walled cylinder, push it into the outer thin-walled cylinder, and complete the installation of the energy absorption device.

[0053] Example 2: Compression Resistance and Energy Absorption Capacity Test

[0054] Figure 9 This is a schematic diagram of the compression test loading of the present invention, consisting of an upper pressure plate 5, a test specimen 6, and a lower pressure plate 7 of the testing machine. The specimen is compressed using a displacement loading mode at a loading speed of 1 mm / min. Since different cross-sectional structures will significantly affect the energy absorption capacity and load-bearing capacity of the present invention, therefore, by adopting… Figure 9 The loading device shown is used to test the compressive strength and energy absorption capacity of the present invention. The ends of the primary vein structure 101, secondary vein structure 102, and tertiary vein structure 103 of the three-level branched leaf vein structure of this device are located on concentric circles of different radii, with diameters represented by D1, D2, and D3, and widths represented by W1, W2, and W3, respectively. Wherein, D1 / D2 = 0.60, D2 / D3 = 0.68, and in this embodiment, D2 = 100 mm. To obtain the optimal three-level width ratio, the thickness b of the outer thin-walled cylinder 301 is taken as the reference value, and W3 = b = 2 mm, then:

[0055] ζ = W1 / W2

[0056] η = W2 / W3

[0057] Wherein, ζ is the ratio of the width of the primary leaf vein structure 101 to the width of the secondary leaf vein structure 102, and η is the ratio of the width of the secondary leaf vein structure 102 to the width of the tertiary leaf vein structure 103. The structural parameters are shown in Table 1.

[0058] Table 1 Structural Parameters

[0059]

[0060]

[0061] The overall performance of the device is evaluated by φ, where φ is the compressive bearing capacity (the maximum load value in the load-displacement curve, F).max The combined normalized index of specific absorbed energy (SEA) and specific absorbed energy (absorbed energy per unit mass) is calculated using the following formula:

[0062]

[0063] The results are shown in Table 2. When ζ = 1.333 and η = 1.5, that is, when the three-level width distribution is 4:3:2, φ is the largest and the overall performance of the device is the best.

[0064] Table 2 Numerical simulation results

[0065] φ 0.46 0.57 0.88 0.90 0.72

Claims

1. A thin-walled pressure-resistant energy-absorbing device with a structure mimicking the veins of a Victoria amazonica leaf, characterized in that: The device comprises one or more multi-level tree-like branch substructures, a cable (2), an outer thin-walled cylinder (3), and a central shaft (4); The multi-level tree-like branch substructures are evenly arranged around the central axis inside the outer thin-walled cylinder, and the multi-level tree-like branch substructures are designed with buckle I and buckle II at both ends respectively; Groove I and groove II are respectively provided on the outer periphery of the central shaft and inside the outer thin-walled cylinder; The three-level tree-like branch substructure is connected at one end to the central axis through snap I and face groove I, and at the other end to the outer thin-walled cylinder through snap II and face groove II, forming a whole; Cables (2) are provided between and within the multi-level tree-like branch substructures; the cables are arranged in the dimensional direction of the energy absorption device; The multi-level tree-like branch substructure has cables (2) installed on both sides of its outer surface; the cables (2) are set inside the tree-like branch substructure (1) and between each substructure, and there is no prestress in the cables; Six multi-level tree-like branch substructures are evenly spaced around the central axis. The multi-level tree-like branch substructures are three-level tree-like branch substructures. Each three-level tree-like branch substructure is arranged from the inside out as three-level tree-like branch substructure I, three-level tree-like branch substructure II, and three-level tree-like branch substructure III. The branch thickness decreases from the inside out, and the thickness ratio is 4:3:

2. The multi-level tree-like branching substructure has branches at the same angle of 60° at each level, and the angle bisector coincides with the extension of the previous level branch, forming a fractal structure. The central shaft has a hexagonal prism shape and a face groove (401) on each face. The multi-level tree-like branch substructure has welded rings (106) on both sides of its outer surface for installing cables.

2. The thin-walled pressure-resistant energy-absorbing device with a simulated Victoria amazonica leaf vein structure according to claim 1, characterized in that: When the cable is inside the substructure, it is set at the midline and the bottom edge of the triangular area formed by branch II (102); When the cables are between substructures, they are installed at the midline, base, and midpoint of the triangle; the cables are not prestressed. When the height of the device is less than twice the length of the Class I branch (101), the cable is arranged at half the height; When the height of the device is greater than twice the length of the Class I branch (101), one set of cables is arranged every one Class I branch length.

3. The installation method of the thin-walled pressure-resistant energy-absorbing device with a simulated Victoria amazonica leaf vein structure according to claim 1, characterized in that, The steps include the following: Step 1: Install cables within the multi-level tree-like branch substructure to constrain the out-of-plane deformation of each tree-like branch substructure; Step 2: Connect the three-level tree-like branch substructure with the cable installed to the central shaft by inserting it into the face groove to form a whole; Step 3: Install cables between the three-level tree-like branch substructures to connect the substructures into a whole, ensuring the overall stability and preventing the force transmission path in each tree-like branch component from being destroyed. Step 4: Align the substructure buckle with the groove of the outer thin-walled cylinder and push it into the outer thin-walled cylinder to complete the installation of the energy absorption device. This fractal structure will evenly transfer the load to the outer thin-walled cylinder layer by layer.

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