A truncated pyramid-shaped energy-absorbing box based on origami geometry

Abstract

The application relates to the technical field of structural engineering. The purpose is to provide a truncated triangular pyramid-shaped energy absorption box based on paper folding geometry, which has the characteristics of good energy absorption performance, strong structural rigidity and simple manufacturing. The technical scheme is a truncated triangular pyramid-shaped energy absorption box based on paper folding geometry, characterized in that the energy absorption box comprises two parallel arranged layer plates and a plurality of folding units arranged in parallel between the two layer plates; the folding unit is axially connected by two energy absorption columns, and the energy absorption column is a truncated triangular pyramid shell with an open bottom.

Description

Technical Field

[0001] This invention relates to the field of structural engineering technology, specifically a truncated triangular pyramidal energy-absorbing box based on origami geometry. Background Technology

[0002] With the rapid development of various modes of transportation, energy-absorbing structures have gradually demonstrated their importance to the development of modern society in the field of engineering. Among them, origami structures, as an extremely important and dynamic type of energy-absorbing structure, have become an important direction for the development of energy-absorbing structures.

[0003] Origami, with its ability to transform soft sheets into structures with a certain degree of rigidity through folding, has been used in engineering research. The resulting structures, due to their excellent folding ability and high practical value, have received increasing attention from the scientific and engineering communities in recent years. Origami structures, as a novel structural form, have been introduced as the core of sandwich structures. Sandwich structures, as the name suggests, typically refer to a mesh-like, crushable core sandwiched between two high-strength outer layers. This structure has been widely used due to its high specific strength, light weight, and high energy absorption capacity. However, existing origami sandwich structures also suffer from problems such as low forming precision, weak mechanical properties, and structural uniformity.

[0004] Besides origami structures, the breaking response behavior of paper-cut structures has also been extensively studied in recent years. Unlike origami structures, the sheets used in paper-cut structures can be cut or stamped before folding, thus allowing for more complex geometries and potentially improved compressive strength. However, unlike other folding structures, the best-performing paper-cut structures to date cannot be manufactured from a single sheet but require multiple sheets to be folded individually and then assembled.

[0005] In conclusion, the research on energy-absorbing boxes is of great significance for applications in the field of structural engineering technology. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings in the above-mentioned background technology and provide a truncated triangular pyramid energy-absorbing box based on origami geometry. This energy-absorbing box should have the characteristics of good energy absorption characteristics, strong structural rigidity, and simple manufacturing.

[0007] The technical solution of this invention is:

[0008] A truncated triangular pyramid energy-absorbing box based on origami geometry is characterized in that: the energy-absorbing box includes two parallel arranged layers and several folding units arranged in parallel between the two layers; the folding unit is formed by two energy-absorbing columns axially connected, and the energy-absorbing column is a truncated triangular pyramid shell with an open bottom surface.

[0009] The folding units are evenly arranged around the central axis of the energy-absorbing box.

[0010] In the same folding unit, the upper bottom surfaces of the two energy-absorbing columns are connected, and the lower bottom surface of each energy-absorbing column is connected to the same side plate.

[0011] In the same folding unit, the top surfaces of the two energy-absorbing columns overlap.

[0012] The bottom edges of the energy-absorbing columns of two adjacent folded units are parallel to each other.

[0013] The folding unit includes a first folding unit and a second folding unit arranged at intervals around the central axis of the energy-absorbing box.

[0014] The length of the bottom edge of the energy-absorbing box of the first folding unit is greater than the length of the bottom edge of the energy-absorbing box of the second folding unit, and the length of the top edge of the energy-absorbing box of the first folding unit is greater than the length of the top edge of the energy-absorbing box of the second folding unit.

[0015] In the same folding unit, the top surfaces of the two energy-absorbing columns are bonded and fixed together.

[0016] The number of the first folding unit is three, and the number of the second folding unit is three.

[0017] The beneficial effects of this invention are:

[0018] This invention provides a truncated triangular pyramid energy-absorbing box based on origami geometry. Compared with the traditional sandwich structure, this energy-absorbing box has better energy absorption characteristics, stronger structural rigidity, and simpler manufacturing method. At the same time, the raw materials are readily available and the cost is low. Attached Figure Description

[0019] Figure 1 This is one of the three-dimensional structural schematic diagrams of the present invention.

[0020] Figure 2 This is the second three-dimensional structural schematic diagram of the present invention.

[0021] Figure 3 This is a schematic diagram of the main structure of the present invention.

[0022] Figure 4 This is a schematic diagram of the left-side structure of the present invention.

[0023] Figure 5 This is a rear view structural schematic diagram of the present invention.

[0024] Figure 6 This is a top view of the structure of the present invention.

[0025] Figure 7 This is a bottom-view structural diagram of the present invention.

[0026] Figure 8This is an exploded view of the present invention.

[0027] Figure 9 This is a schematic diagram of the layer plate and energy-absorbing column of the present invention.

[0028] Figure 10 This is a schematic diagram of an embodiment of the present invention.

[0029] Reference numerals in the attached drawings: 1. Layer plate; 1.1. Hollow part; 2. Energy-absorbing column; 2.1. Upper bottom surface; 2.2. Lower bottom surface; 2-1. First folding unit; 2-2. Second folding unit; 3.1. First lower bottom edge; 4.1. Second lower bottom edge; 3.2. Third lower bottom edge; 4.2. Fourth lower bottom edge; 3.3. Fifth lower bottom edge; 4.3. Sixth lower bottom edge; Axis A. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] like Figure 1 As shown, a truncated triangular pyramidal energy-absorbing box with origami geometry includes two layers 1 and several folding units. The two layers are arranged in parallel, and the several folding units are arranged in parallel between the two layers, with the layers connected as a whole through the folding units.

[0032] Each folding unit includes two energy-absorbing columns 2, which are arranged along the axial direction (parallel to) Figure 3 The axis A) is connected, the energy-absorbing column is a truncated triangular pyramid shell with the bottom surface of the truncated triangular pyramid shell open, the upper base of the energy-absorbing column is an equilateral triangle, the lower base of the energy-absorbing column is an equilateral triangle, and the side surface of the energy-absorbing column is an isosceles trapezoid.

[0033] like Figure 3 As shown, in the same folding unit, the upper bottom surface 2.1 of the energy-absorbing column is connected to the upper bottom surface of another energy-absorbing column, and the lower bottom surface 2.2 of the energy-absorbing column is connected to the shelf on the same side. The shelf is provided with a hollow part 1.1 that matches the shape of the lower bottom surface of the energy-absorbing column.

[0034] like Figure 3 As shown, in the same folding unit, the upper bottom surfaces of the two energy-absorbing columns coincide, and the upper bottom edges of the two energy-absorbing columns are parallel to their corresponding lower bottom edges. Figure 6 As shown, the three bottom edges of the energy-absorbing columns of two adjacent folded units are parallel to each other. Figure 7 In the middle, the first lower bottom edge 3.1 is parallel to the second lower bottom edge 4.1, the third lower bottom edge 3.2 is parallel to the fourth lower bottom edge 4.2, and the fifth lower bottom edge 3.3 is parallel to the sixth lower bottom edge 4.3. Similarly, the three upper bottom edges of the energy-absorbing columns of two adjacent folding units are also parallel to each other.

[0035] like Figure 8 As shown, the folding unit includes a first folding unit 2-1 and a second folding unit 2-2. The bottom edge length of the energy-absorbing box of the first folding unit is greater than the bottom edge length of the energy-absorbing box of the second folding unit, and the top edge length of the energy-absorbing box of the first folding unit is greater than the top edge length of the energy-absorbing box of the second folding unit. There are three first folding units and three second folding units.

[0036] In the first folding unit, the length of the lower bottom edge of the energy-absorbing column is preferably 38mm, the length of the upper bottom edge is preferably 22mm, and the height is preferably 8√3mm. In the second folding unit, the length of the lower bottom edge of the energy-absorbing column is preferably 30mm, the length of the lower bottom edge is preferably 14mm, and the height is preferably 8√3mm.

[0037] The layers and energy-absorbing columns are made of non-metallic or metallic materials. Non-metallic materials can be obtained by laser cutting, while metallic materials can be obtained by water jet cutting.

[0038] like Figure 9 As shown, the layer is integrated with the energy-absorbing column on the same side, and the upper and lower surfaces of the two corresponding energy-absorbing columns are bonded and fixed together. The preferred adhesive type is ergo1665NB (for bonding metal), and the preferred material is copper, because this type of adhesive has high bonding strength and can maintain the stability of the structure. After multiple experiments, the appropriate amount of adhesive used was determined to be 0.28g. During bonding, a syringe with a measuring range is used to inject the adhesive between the upper and lower surfaces to connect and assemble the energy-absorbing box. This assembly method is simple and efficient.

[0039] This invention allows for the combined use of multiple energy-absorbing boxes. Figure 10 The shelves of each energy-absorbing box are glued together.

[0040] The working principle of this invention is:

[0041] In the initial stage of a low-speed impact, before the in-plane stress takes effect, the friction between the layers keeps the structure in a suitable position, functioning as an internal lock. Subsequently, the in-plane buckling of the energy-absorbing column, induced by the freely supported folding unit sidewalls (the sidewalls of the energy-absorbing column), transforms the vertical load into compressive deformation of the sidewalls. At this point, the sidewalls of the energy-absorbing column collapse due to inward or outward deformation, thus absorbing the impact energy. Therefore, this energy-absorbing box possesses strong structural rigidity while effectively improving its energy absorption efficiency, and is also low-cost, easy to manufacture, and simple and efficient to assemble.

[0042] The design method of the energy-absorbing box is as follows:

[0043] S1: Select the side length of the hexagonal grid, fill the drawing with it, and design according to certain rules;

[0044] S2: Based on various needs, make overall plans and determine the overall size parameters of the energy absorption box;

[0045] S3: Perform 3D modeling based on the overall geometric parameters of the energy-absorbing box;

[0046] S4: Based on the 3D model of the energy-absorbing box, perform finite element analysis on the model to verify whether the overall performance of the energy-absorbing box meets the requirements. If it passes, proceed to step S5; if it fails, continue to modify the design parameters until it passes the evaluation.

[0047] S5: Based on the final 3D model that meets the performance requirements, complete the overall design of the energy-absorbing box, and further complete the production of the physical model.

[0048] The accompanying drawings illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

Claims

1. A truncated-triangular-prism-shaped energy-absorbing box based on origami geometry, characterized by: The energy-absorbing box includes two parallel shelves (1) and several folding units disposed between the two shelves; the folding units are formed by two energy-absorbing columns (2) axially connected, and the energy-absorbing columns are regular triangular frustum shells with open bottom surfaces; The folding units are evenly arranged around the central axis of the energy-absorbing box; In the same folding unit, the upper bottom surfaces (2.1) of the two energy-absorbing columns are connected, and the lower bottom surface (2.2) of each energy-absorbing column is connected to the same side panel; In the same folding unit, the top surfaces of the two energy-absorbing columns overlap; The bottom edges of the energy-absorbing columns of two adjacent folded units are parallel to each other; The folding unit includes a first folding unit (2-1) and a second folding unit (2-2) arranged at intervals around the central axis of the energy-absorbing box. The length of the lower bottom edge of the energy-absorbing column of the first folding unit is greater than the length of the lower bottom edge of the energy-absorbing column of the second folding unit, and the length of the upper bottom edge of the energy-absorbing column of the first folding unit is greater than the length of the upper bottom edge of the energy-absorbing column of the second folding unit.

2. The origami geometry based truncated pyramid shaped energy absorbing box of claim 1, wherein: In the same folding unit, the top surfaces of the two energy-absorbing columns are bonded and fixed together.

3. The truncated triangular pyramidal energy-absorbing box based on origami geometry according to claim 2, characterized in that: The number of the first folding unit is three, and the number of the second folding unit is three.

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