CN115585205A - Truncated triangular pyramid-shaped energy absorption box based on paper folding geometry - Google Patents

Abstract

The invention relates to the technical field of structural engineering. The energy absorption box has the characteristics of good energy absorption characteristic, strong structural rigidity and simplicity in manufacturing. The technical scheme is a truncate triangular pyramid energy-absorbing box based on paper folding geometry, which is characterized in that: the energy absorption box comprises two laminates which are arranged in parallel and a plurality of folding units which are arranged between the two laminates in parallel; the folding unit is formed by axially connecting two energy absorption columns, and each energy absorption column is a truncated triangular pyramid shell with an open bottom surface.

Description

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

technical field

The invention relates to the technical field of structural engineering, in particular to a truncated triangular pyramid-shaped energy-absorbing box based on origami geometry.

Background technique

With the rapid development of various means of transportation, energy-absorbing structures in the engineering field have gradually highlighted their significance to the development of modern society, and the origami structure is an extremely important and most dynamic energy-absorbing structure. It has become an important direction for the development of energy-absorbing structures.

Origami has been used in engineering research for its ability to transform soft sheets into rigid structures through folding. The structure formed by folding has attracted more and more attention from the scientific and engineering circles in recent years because of its excellent folding ability and high practical value. The origami structure, as a new structural form, was introduced as the core of the sandwich structure. Sandwich structure, as the name suggests, usually refers to a mesh-like crushable core sandwiched between two high-strength skins, which has been widely used due to its high specific strength, light weight, and high energy absorption capacity. However, the existing origami sandwich structure also has problems such as low forming precision, weak mechanical properties, and single structure.

In addition to origami structures, the fracture response behavior of kirigami structures has also been extensively studied in recent years. Unlike origami structures, the sheets of kirigami structures can be cut or punched before being folded, so more complex geometries can be obtained, with possible improvements in resistance to compression. However, unlike other folding structures, the current best-performing kirigami structures cannot be fabricated from a single sheet, but require multiple sheets to be folded and assembled separately.

To sum up, it is of great significance to study the energy-absorbing box for the application in the field of structural engineering technology.

Contents of the invention

The purpose of the present invention is to overcome the disadvantages of the above-mentioned background technology and provide a truncated triangular pyramid-shaped energy-absorbing box based on origami geometry. The energy-absorbing box should have the characteristics of good energy-absorbing characteristics, strong structural rigidity, and simple manufacture.

Technical scheme of the present invention is:

A truncated triangular pyramid-shaped crash box based on origami geometry, characterized in that: the crash box includes two laminates arranged in parallel and several folding units arranged in parallel between the two laminates; the folding units consist of Two energy-absorbing columns are axially connected, and the energy-absorbing column is a truncated triangular pyramid shell with an open bottom.

The folding units are evenly arranged around the central axis of the crash box.

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 with the same side laminate.

In the same folding unit, the upper and lower surfaces of the two energy-absorbing columns coincide.

The lower bases of the energy-absorbing columns of two adjacent folding units are respectively parallel to each other.

The folding unit includes a first folding unit and a second folding unit arranged at intervals around the central axis of the crash box.

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 upper edge of the energy-absorbing box of the first folding unit is greater than that of the energy-absorbing box of the second folding unit. The length of the top edge of the energy box.

In the same folding unit, the upper and lower surfaces of the two energy-absorbing columns are bonded and fixed.

The number of the first folding units is three, and the number of the second folding units is three.

The beneficial effects of the present invention are:

The invention provides a truncated triangular pyramid-shaped energy-absorbing box based on origami geometry. Compared with the traditional sandwich structure, the energy-absorbing box has good energy-absorbing characteristics, strong structural rigidity, simple manufacturing method, easy access to raw materials, and low cost. low.

Description of drawings

Fig. 1 is one of the three-dimensional structure schematic diagrams of the present invention.

Fig. 2 is the second schematic diagram of the three-dimensional structure of the present invention.

Fig. 3 is a schematic diagram of the front view structure of the present invention.

Fig. 4 is a left view structural schematic diagram of the present invention.

Fig. 5 is a rear view structural schematic diagram of the present invention.

Fig. 6 is a schematic top view of the present invention.

Fig. 7 is a schematic bottom view of the present invention.

Figure 8 is an exploded view of the present invention.

Fig. 9 is a schematic diagram of a laminate and an energy-absorbing column of the present invention.

Fig. 10 is a schematic diagram of an embodiment of the present invention.

Reference signs: laminate 1, hollow part 1.1, energy-absorbing column 2, upper bottom surface 2.1, lower bottom surface 2.2, first folding unit 2-1, second folding unit 2-2, first lower bottom edge 3.1, second Lower base 4.1, third lower base 3.2, fourth lower base 4.2, fifth lower base 3.3, sixth lower base 4.3, axis A.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in FIG. 1 , a truncated triangular pyramid-shaped crash box with origami geometry includes two laminates 1 and several folding units. The two laminates are arranged in parallel, and several folding units are arranged in parallel between the two laminates, and the laminates are connected as a whole through the folding units.

Each folding unit comprises two energy-absorbing columns 2, and these two energy-absorbing columns are connected along the axial direction (parallel to the axis A in Fig. 3), and the energy-absorbing columns are truncated triangular pyramid shells and truncated triangular pyramid shells. The bottom surface is open, the upper bottom surface of the energy-absorbing column is an equilateral triangle, the lower bottom surface of the energy-absorbing column is an equilateral triangle, and the side surface of the energy-absorbing column is an isosceles trapezoid.

As shown in Figure 3, 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 laminate on the same side. The hollow part 1.1 which is suitable for the shape of the lower bottom surface of the energy-absorbing column.

As shown in FIG. 3 , in the same folding unit, the upper bottoms of the two energy-absorbing columns overlap, and the upper bottoms of the two energy-absorbing columns are parallel to the corresponding lower bottoms. As shown in Figure 6, the three lower bases of the energy-absorbing columns of two adjacent folding units are respectively parallel to each other (in Figure 7, the first lower base 3.1 is parallel to the second lower base 4.1, the third lower base 3.2 Parallel to the fourth bottom edge 4.2, the fifth bottom edge 3.3 is parallel to the sixth 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.

As shown in FIG. 8 , the folding unit includes a first folding unit 2-1 and a second folding unit 2-2. 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 upper edge of the energy-absorbing box of the first folding unit is greater than that of the energy-absorbing box of the second folding unit. The length of the top edge of the energy box. The number of the first folding units is three, and the number of the second folding units is three.

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

The laminates and energy-absorbing columns are plates made of non-metallic materials or metal materials. Non-metallic materials can be drawn by laser cutting machines, and metal materials can be drawn by water-jet cutting.

As shown in FIG. 9 , the laminates are integrated with the energy-absorbing columns on the same side, and the upper and bottom surfaces of the two corresponding energy-absorbing columns are bonded and fixed. The preferred glue model is ergo1665NB (for bonding metal), and the preferred plate material is copper, because this type of glue has greater bonding strength and can maintain the stability of the structure. After many experiments, it is determined that the appropriate amount of glue is 0.28g. When bonding, use a needle tube with a measuring range to inject glue between the upper and lower surfaces to connect and assemble the energy-absorbing box. This assembly method is simple and efficient.

In the present invention, multiple energy-absorbing boxes can be used in combination (Fig. 10), and the laminates of each energy-absorbing box are bonded and fixed by glue.

The working principle of the present invention is:

At the initial stage of the energy-absorbing box being subjected to low-speed impact, that is, before the in-plane stress acts, the friction between the laminates is used to keep the structure in a proper position, which plays the role of its internal lock; after that, the surface of the energy-absorbing column is used Inward buckling, under the induction of the side wall of the freely supported folding unit (the side wall of the energy-absorbing column), the load in the vertical direction is converted into the compression deformation of the side wall. At this time, the side wall of the energy-absorbing column is concave or outward The convex deformation guides the collapse, thereby absorbing the collision energy. Therefore, while the energy-absorbing box has strong structural rigidity, the energy-absorbing efficiency of the energy-absorbing box is effectively improved, and the cost is low, the manufacture is simple, and the assembly method is simple and efficient.

The design method of the energy absorbing box is as follows:

S1: Select the side length of the hexagonal grid, spread it all over the drawing and follow certain rules to design on it;

S2: Carry out overall planning according to each requirement, and determine the overall size parameters of the energy-absorbing box;

S3: Carry out three-dimensional modeling according to the overall geometric parameters of the energy-absorbing box;

S4: According to the three-dimensional model of the energy-absorbing box, conduct finite element analysis on the model to verify whether the overall performance of the energy-absorbing box meets the requirements, and if it passes, proceed to step S5; if not, continue to modify the design parameters until it passes the evaluation;

S5: According to the 3D model that finally meets the performance requirements, complete the overall design of the energy-absorbing box, and further complete the production of the physical model.

Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

Claims (9)

1. The utility model provides a cut triangular pyramid energy-absorbing box based on paper folding geometry which characterized in that: the energy absorption box comprises two laminates (1) which are arranged in parallel and a plurality of folding units arranged between the two laminates; the folding unit is formed by axially connecting two energy absorption columns (2), and the energy absorption columns are regular triangular platform shells with open bottom surfaces.

2. The folded paper geometry-based truncated triangular pyramid energy absorption box of claim 1, wherein: the folding units are uniformly arranged around a central axis of the energy absorption box.

3. The folded paper geometry-based truncated triangular pyramid energy absorption box of claim 2, wherein: 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 with the same side layer plate.

4. The origami-based truncated triangular pyramid energy-absorbing box of claim 3, wherein: in the same folding unit, the upper bottom surfaces of the two energy absorption columns are overlapped.

5. The origami-based truncated triangular pyramid energy-absorbing box of claim 4, wherein: the lower bottom edges of the energy absorption columns of two adjacent folding units are respectively parallel to each other.

6. The origami-based truncated triangular pyramid energy-absorbing box of claim 5, wherein: the folding unit comprises a first folding unit (2-1) and a second folding unit (2-2) which are arranged around the central axis of the energy absorption box at intervals.

7. The folded paper geometry-based truncated triangular pyramid energy absorption box of claim 6, wherein: the length of the lower bottom edge of the energy absorption box of the first folding unit is greater than that of the energy absorption box of the second folding unit, and the length of the upper bottom edge of the energy absorption box of the first folding unit is greater than that of the energy absorption box of the second folding unit.

8. The origami-based truncated triangular pyramid energy-absorbing box of claim 7, wherein: in the same folding unit, the upper bottom surfaces of the two energy absorption columns are fixedly bonded.

9. The origami-based truncated triangular pyramid energy-absorbing box of claim 8, wherein: the number of the first folding units is three, and the number of the second folding units is three.

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