Ball filling type honeycomb hierarchical energy absorption system with editable characteristic

Abstract

The invention relates to a ball-filled honeycomb-like hierarchical energy absorption system with editable characteristic, which comprises a honeycomb-like hierarchical structure, the honeycomb-like hierarchical structure comprises at least one layer of regular hexagonal tubes, when the number of the regular hexagonal tubes is more than two, the regular hexagonal tubes are nested together in sequence, and the sizes of the regular hexagonal tubes in the regular hexagonal tubes are gradually reduced; round pipes are arranged at the parting positions of all the vertexes of the regular hexagon pipe respectively, hollow balls are filled in the round pipes in the axial direction of the round pipes, and the hollow balls are positioned and restrained in the corresponding round pipes. The whole energy absorption system can achieve different filling modes by adjusting a hierarchy coefficient and a scaling factor, the hierarchy coefficient is the number of layers of the regular hexagonal pipe and is lambda, lambda is an integer larger than or equal to 1, and the scaling factor is the ratio of the side length of the regular hexagonal pipe to the inner diameter of a circular pipe at the vertex parting position of the regular hexagonal pipe. The whole energy absorption system has good energy absorption and buffering characteristics.

Description

Technical Field

[0001] The present invention relates to the technical field of energy absorption systems, and in particular to a ball-filled honeycomb-type hierarchical energy absorption system with editable characteristics. Background Art

[0002] Collision energy absorption devices can greatly improve the passive protection capabilities of automobiles and rail vehicles, as well as the anti-crash capabilities of helicopters and aerospace vehicles, and play an important role in protecting life and property safety. For example, the bumper assembly of a car is mainly composed of an anti-collision beam, an energy absorption tube, a connecting plate, etc., and is connected to the body by bolts. It is easy to disassemble and facilitate maintenance. The entire bumper assembly plays a major role in protecting the vehicle in a low-speed collision. The energy absorption tube absorbs most of the energy in a low-speed collision and is one of the main energy absorption components of a car collision. Under the premise of constraining mass and size, optimizing the design of the collision resistance of the energy absorption tube is of great significance to improving the passive safety performance of the car during the lightweight process.

[0003] In the prior art, two regular hexagonal energy-absorbing structures of different sizes are combined to form a dense spider web structure. Although this structure can achieve a certain energy-absorbing effect, Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a ball-filled honeycomb-type hierarchical energy absorption system with editable characteristics.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A spherical-filled honeycomb-like hierarchical energy absorption system with editable characteristics comprises a honeycomb-like hierarchical structure, wherein the honeycomb hierarchical structure comprises at least one layer of regular hexagonal tubes. When there are more than two layers of regular hexagonal tubes, the regular hexagonal tubes are nested in sequence and the size of the regular hexagonal tubes inside gradually decreases. A circular tube is provided at each vertex parting of the regular hexagonal tube, and the interior of the circular tube is filled with hollow balls along its axial direction, and the hollow balls are positioned and constrained in the corresponding circular tube. The entire energy absorption system can achieve different filling modes by adjusting the layer coefficient and the proportional factor, wherein the layer coefficient is the number of layers of the regular hexagonal tubes is λ, λ is an integer greater than or equal to 1, and the proportional factor is the ratio of the side length of the regular hexagonal tube to the inner diameter of the circular tube at the vertex parting of the regular hexagonal tube.

[0006] Furthermore, the hollow sphere is formed of a lightweight porous material.

[0007] Furthermore, when there are more than two layers of regular hexagonal tubes, the corresponding circular tubes of two adjacent layers of regular hexagonal tubes are connected into one by a rib plate.

[0008] The above technical solution has the following beneficial technical effects: the energy absorption system is composed of a honeycomb-like hierarchical structure and a hollow sphere structure, so that the structure has the advantages of both honeycomb and hierarchy, and the vertex parting improves the utilization rate of the spatial structure. The hollow sphere is insensitive to the impact load. The hollow sphere structure is filled to the fixed point parting of the honeycomb-like hierarchical structure and is positioned and constrained, so that the entire system has good energy absorption and buffering characteristics. In addition, the entire energy absorption system can achieve different filling modes by adjusting the hierarchical coefficient and the proportional factor, so that the system has comprehensive impact resistance, and while improving the structural energy absorption, the peak load is stably improved, reconciling the contradiction between the peak load and the energy absorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 It is a schematic diagram of a three-dimensional model of a ball-filled honeycomb-type hierarchical energy absorption system of the present invention; Figure 2 It is a schematic diagram of a honeycomb-like hierarchical structure; Figure 3 It is the load diagram of the 1st level unfilled honeycomb-like hierarchical structure; Figure 4 The load-displacement curve of the 1st level unfilled honeycomb-like hierarchical structure; Figure 5 It is the load diagram of the 2-level unfilled honeycomb-like hierarchical structure; Figure 6 The load-displacement curve of the 2-level unfilled honeycomb-like hierarchical structure; Figure 7 It is the load diagram of the 2-level ball-filled honeycomb-like hierarchical energy absorption system; Figure 8 The load-displacement curve of the 2-level ball-filled honeycomb-type hierarchical energy absorption system; Fig. 9 Comparison of energy absorption-displacement curves of three simulation examples. DETAILED DESCRIPTION

[0010] The present invention discloses a ball-filled honeycomb-like hierarchical energy absorption system with editable characteristics. The energy absorption system is composed of a honeycomb-like hierarchical structure and hollow balls. The three-dimensional model is as follows: Figure 1 As shown, it specifically includes a honeycomb-like hierarchical structure, which includes at least one layer of regular hexagonal tubes 1. When there are more than two layers of regular hexagonal tubes 1, each regular hexagonal tube 1 is nested together in sequence and the size of the regular hexagonal tubes 1 inside gradually decreases. The honeycomb-like hierarchical structure introduces a hierarchical structure and a vertex-based partitioning structure on the basis of the traditional hexagonal honeycomb structure concept, so that the structure has the advantages of both honeycomb and hierarchy, and the vertex partitioning improves the utilization rate of the space structure.

[0011] A circular tube 2 is provided at each vertex of the regular hexagonal tube 1, and the interior of the circular tube 2 is filled with a hollow ball 3 along its axial direction, and the hollow ball 3 is positioned and constrained in the corresponding circular tube 2. The hollow ball 3 is formed of a lightweight porous material and is insensitive to the impact load. The entire energy absorption system can achieve different filling modes by adjusting the layer coefficient and the proportional factor, where the layer coefficient is the number of layers of the regular hexagonal tube λ, λ is an integer greater than or equal to 1, and the proportional factor is the ratio of the side length of the regular hexagonal tube to the inner diameter of the circular tube at the vertex of the regular hexagonal tube.

[0012] When there are more than two layers of regular hexagonal tubes 1, the corresponding circular tubes of two adjacent layers of regular hexagonal tubes 1 are connected into one by rib plates 4, which has strong stability. In addition, the regular hexagonal tubes produce synergistic effects during the energy absorption process of the system to achieve progressive destruction energy absorption.

[0013] The structural schematic diagram of the ball-filled honeycomb hierarchical energy absorption system described in the present invention is as follows: Figure 2 As shown, the height of the entire energy absorption system is H, the hierarchical coefficient of the honeycomb-like hierarchical structure is λ (λ is an integer greater than or equal to 1), the side length of the regular hexagonal tube is L, the inner diameter of the circular tube at the vertex parting of the regular hexagonal tube is D, the structural wall thickness of the regular hexagonal tube is t2, the proportional factor is =D / L, the outer diameter of the hollow ball is d, and the wall thickness is t1. When the hierarchical coefficient λ≥1, the axial conventional filling and gradient filling of the hollow ball structure can be realized; when λ≥2, the radial gradient filling of the hollow ball structure can be realized.

[0014] Simulation Example 1: Analysis of the energy absorption characteristics of the first-level unfilled honeycomb-like hierarchical structure under quasi-static compression. The material of Example 1 is aluminum 6061, the hierarchical coefficient λ is 1, the wall thickness t1 is 1mm, the height H is 100mm, L=60mm, the proportional factor is 0.33, and the finite element analysis is performed on the first-level honeycomb-like structure without hollow balls in the system. Figure 3 As shown in the figure, based on Ansys / LS-dyna, the quasi-static compression simulation is performed. Two rigid plates are used as external boundary conditions for the upper and lower parts of the energy absorption system. The upper plate applies a compression speed of 1m / s downward, and the lower plate is fixed. In engineering, 70% of the overall stroke is generally used as the effective compression displacement of this simulation. The load-displacement curve of the structure is obtained through simulation calculation. Figure 4 It can be seen that the initial peak load of the structure is 71.4kN. After processing the data, the total energy absorption of the structure is 3099.8J and the load efficiency is 60.8%.

[0015] Simulation Example 2: Analysis of the energy absorption characteristics of a 2-level unfilled honeycomb-like hierarchical structure under quasi-static compression. Figure 5 As shown, the layer coefficient λ of Example 2 is set to 2, and other parameters are set unchanged. The load-displacement curve of the structure is obtained by simulation calculation, Figure 6It can be seen that the initial peak load of the structure is 79.4kN. After processing the data, the total energy absorption of the structure is 4222.8J and the load efficiency is 75.8%.

[0016] Simulation Example 3: Analysis of the energy absorption characteristics of a 2-level ball-filled honeycomb-like hierarchical energy absorption system under quasi-static compression. Figure 7 As shown, in Example 3, hollow balls are filled into a honeycomb-like hierarchical structure to form an energy absorption system, the hierarchical coefficient λ is 2, the diameter d of the hollow balls is 19 mm, the wall thickness t2 is 0.6 mm, and the size parameters of the honeycomb-like hierarchical structure are the same as those of Examples 1 and 2. The load-displacement curve is obtained by simulation calculation. Figure 8 It can be seen that the initial peak load of the structure is 42.8kN. After processing the data, the total energy absorption of the structure is 10548.1J and the load efficiency is 85%.

[0017] like Fig. 9 As shown in the figure, through the analysis of the above three simulation examples, it can be seen that the load-displacement curve of the unfilled honeycomb-type hierarchical level 2 is more stable than that of the level 1 structure in the platform period, and the deformation is more stable. The initial peak loads of the level 1 structure and the level 2 structure are 71.4kN and 79.6kN, respectively, the total energy absorption is 3099.8J and 4222.8J, respectively, and the load efficiency is 60.8% and 75.8%, respectively. In comparison, the peak load increases slightly, the total energy absorption increases by 36.2%, and the load efficiency increases by 24.7%. The initial peak load of the level 2 ball-filled honeycomb-type hierarchical energy absorption system is 42.8kN, the total energy absorption is 10548.1J, and the load efficiency is 85%. Compared with the level 2 unfilled structure, the peak load decreases by 46.2%, the total energy absorption increases by 149.8%, and the load efficiency increases by 12.1%. Therefore, the ball-filled honeycomb-type hierarchical energy absorption system reconciles the contradiction between the peak load and the total energy absorption, and the load efficiency and energy absorption stability are improved simultaneously. The system has good energy absorption and buffering characteristics.

[0018] The above describes a specific embodiment of the present invention, but those skilled in the art should understand that this is only an example. Those skilled in the art can make various changes or modifications to this embodiment without departing from the principle and essence of the present invention, but these changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A spherical filling honeycomb-like hierarchical energy absorption system with editable characteristics, comprising a honeycomb-like hierarchical structure, the honeycomb hierarchical structure comprising at least one layer of regular hexagonal tubes, when there are more than two layers of regular hexagonal tubes, each regular hexagonal tube is nested together in sequence and the size of the regular hexagonal tube inside gradually decreases; each vertex of the regular hexagonal tube is respectively provided with a circular tube, characterized in that: The inside of the circular tube is filled with hollow balls along its axial direction, and the hollow balls are positioned and constrained in the corresponding circular tube; the entire energy absorption system can achieve different filling modes by adjusting the layer coefficient and the proportional factor, where the layer coefficient is the number of layers of the regular hexagonal tube is λ, λ is an integer greater than or equal to 1, and the proportional factor is the ratio of the side length of the regular hexagonal tube to the inner diameter of the circular tube at the vertex parting of the regular hexagonal tube.

2. The ball-filled honeycomb hierarchical energy absorption system with editable characteristics according to claim 1, characterized in that: The hollow ball is formed of a light porous material.

3. The ball-filled honeycomb hierarchical energy absorption system with editable characteristics according to claim 1, characterized in that: When there are more than two layers of regular hexagonal tubes, the corresponding circular tubes of two adjacent layers of regular hexagonal tubes are connected into one by a rib plate.

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