CN-122008631-A - Paper folding improved round tube impact-resistant protection structure and application

Abstract

The invention belongs to the technical field of impact resistance protection, and relates to an impact resistance protection structure of a paper folding improved round tube and application thereof, wherein a thin-wall three-dimensional structure is formed by folding a plane sheet through set folds, the thin-wall three-dimensional structure comprises an arc surface, a right-angled triangle surface and an inclined isosceles triangle surface, wherein the arc surface and the right-angled triangle surface are parallel to the out-of-plane crushing load direction, and support is provided for the structure in the crushing process; the inclined isosceles triangle surface and the two right triangle surfaces form a foot-shaped structure, and the arc surface is supported and induced to generate more stable plastic hinges, so that the initial peak crushing force is reduced and the energy absorption efficiency is improved. The foot-shaped structure can be arranged on the inner side, the outer side or alternatively on the circular arc surface, can be realized in a single-body use mode, a two-dimensional array mode or a three-dimensional array mode, and is suitable for sandwich structure core layers. The structure has higher energy absorption capacity, simple structure and controllable manufacturing process, and is suitable for being applied to the field of impact resistance protection in engineering.

Inventors

• WANG CHENG
• XU BIN
• YANG TONGHUI
• XIAO CHENGLONG
• ZHANG RUMING

Assignees

• 北京理工大学

Dates

Publication Date

20260512

Application Date

20260316

Claims (9)

1. 1. Paper folding improves pipe protection architecture that shocks resistance, its characterized in that: the protective structure is formed by folding a plane sheet according to a set crease; the thin-wall three-dimensional structure comprises a middle cylinder and four feet; The plane sheet is a large square, the center of the large square is provided with a small square notch, four corners of the large square are cut off, the four corners are all isosceles right triangles, the side length of the small square is one third of the side length of the large square, and the right side length of the isosceles right triangles is one sixth of the side length of the large square.
2. 2. The improved round tube impact resistant protective structure of paper folding according to claim 1, wherein: The four vertexes of the small square notch are a ', b', e ', f' respectively; eight extended lines of four sides of the small square notch and the intersection point of the large square are a, b, c, d, e, f, g, h respectively; The points formed by the four corners of the cut large square are b1, b2, d1, d2, f1, f2, h1 and h2 respectively; The folds include aa ', bb', b 'c, e'd, e 'e, f' f, f 'g, a' h, h1a ', h2a', b1b ', b2b', d1e ', d2e', f1f ', f2f'.
3. 3. The improved round tube impact resistant protective structure of paper folding according to claim 2, wherein: aa ', bb', b 'c, e'd, e 'e, f' f, f 'g, a' h are valley folds and h1a ', h2a', b1b ', b2b', d1e ', d2e', f1f ', f2f' are peak folds, the four feet being located outside the intermediate cylinder.
4. 4. The improved round tube impact resistant protective structure of paper folding according to claim 2, wherein: aa ', bb', b 'c, e'd, e 'e, f' f, f 'g, a' h are peak folds and h1a ', h2a', b1b ', b2b', d1e ', d2e', f1f ', f2f' are valley folds, all four feet being located inside the intermediate cylinder.
5. 5. The improved round tube impact resistant protective structure of paper folding according to claim 2, wherein: aa ', bb', b 'c, e'd, e 'e, f' f, f 'g, a' h, h1a ', h2a', d1e ', d2e' are valley folds and b1b ', b2b', f1f ', f2f' are peak folds, two feet are located inside the middle cylinder, and two feet are located outside the middle cylinder.
6. 6. Use of the improved round tube impact protection structure for paper folding according to claim 1, characterized in that: The protective structure is used as a core layer of a sandwich buffer structure.
7. 7. The use of the paper folding improved round tube impact protection structure according to claim 6, wherein: and in the single structure mode, the protection structure is arranged between the top plate and the bottom plate, the top of the protection structure is fixed in contact with the top plate, and the bottom of the protection structure is fixed in contact with the bottom plate.
8. 8. The use of the paper folding improved round tube impact protection structure according to claim 6, wherein: Under the two-dimensional array structure mode, a plurality of protection structures are arranged along two vertical directions and are arranged between a top plate and a bottom plate, the tops of the protection structures are fixed with the top plate in a contact manner, and the bottoms of the protection structures are fixed with the bottom plate in a contact manner to form a two-dimensional array core layer.
9. 9. The use of the paper folding improved round tube impact protection structure according to claim 6, wherein: In the three-dimensional array structure mode, a plurality of protection structures are arranged along three orthogonal directions and are arranged between a top plate and a bottom plate, the tops of the protection structures are fixed in a contact manner with the top plate, and the bottoms of the protection structures are fixed in a contact manner with the bottom plate to form a three-dimensional array core layer.

Description

Paper folding improved round tube impact-resistant protection structure and application Technical Field The invention belongs to the technical field of impact resistance protection. The structural monomer or the structural modularized array of the improved round pipe impact-resistant protection structure can be used for dynamic load protection. Background In the fields of protection engineering, traffic equipment and the like, when a structure is subjected to transient high-energy loads such as explosion, impact and the like, the structure is required to have excellent energy absorption and impact resistance. Multilayer composite panel structures, particularly panel-core-panel "sandwich" configurations, are widely used in protective structure design due to their lightweight, high specific strength and good energy dissipation characteristics. The existing sandwich structure has various core layer topologies including honeycomb, foam, lattice, folded paper configuration and the like, but the prior sandwich structure often has the defects of over high initial peak force, unstable collapse, complex manufacture and the like when bearing dynamic load. Compared with a sandwich structure, the thin-wall circular tube structure is regarded as the most typical and common energy absorbing element for a long time due to simple geometric form and convenient manufacturing, and is widely used for an anti-collision beam, a buffer device and a protective member of an automobile. However, conventional round tubes generally suffer from the following drawbacks under axial compression: When the initial peak crushing force is too high, the round tube often generates sharp peak force in the initial buckling stage when being subjected to impact load, and the excessive impact is easily transmitted to a protection object, so that the impact effect is not facilitated to be slowed down. The energy absorption is insufficient, the fold mode formed by the round tube after buckling is relatively single, the plastic energy consumption efficiency is limited, and the protection requirement under high-energy impact is difficult to meet. The deformation mode is not easy to regulate and control, the circular tube structure is limited by axisymmetry, unstable folds of the circular tube structure often show irregular distribution, the energy dissipation process is uncontrollable, and the stability and reliability of energy absorption are affected. Therefore, although round tubes are the most common thin-wall energy absorbers, the mechanical properties of the round tubes still have a remarkable short plate, and the comprehensive requirements of low initial peak crushing force and high energy absorption capacity are difficult to achieve. Therefore, an innovative optimization design is necessary to be carried out on the circular tube structure so as to overcome the defects and expand the application potential of the circular tube structure in the field of impact protection. In recent years, the paper folding (Origami) concept provides a new idea for sandwich core layer structural design, but the existing configuration still has defects. The three-pump (Miura) paper folding structure has weak collapse resistance and high initial peak stress, and the Cube strip (Cube strip) has the advantages of improved performance, complex processing, high cost and difficult large-scale application. In general, the existing paper folding sandwich structure lacks modularization and standardization, has high manufacturing cost and poor assembly flexibility, and limits engineering popularization. For this reason, patent CN 113829676A proposes a folded paper truncated pyramid structure, which effectively reduces the initial peak stress and improves the energy absorbing capacity. Disclosure of Invention The invention aims to optimally design the round tube thin-wall energy absorber by a paper folding method on the premise of keeping the low cost advantage of the round tube thin-wall energy absorber, and solve the problems of higher initial peak crushing force, lower energy absorption efficiency and difficult regulation and control of a deformation mode of the traditional round tube structure. Under the conditions of controllable cost and simple process, the improved round tube impact-resistant protection structure for paper folding is provided. The structural monomer can be used in the field of impact resistance protection of vehicle energy-absorbing boxes and the like, and can be used as a sandwich structure core layer after being subjected to two-dimensional or three-dimensional array of a plurality of monomers, and is applied to the blunt impact resistance protection of individual protective equipment. The technical scheme of the structure provided by the invention is as follows: The paper folding improved round tube shock resistance protection structure is formed by folding a plane sheet according to a set crease, wherein the thin wall three-dimensional structure comp