A honeycomb core sandwich structure that can bear multidirectional impacts

Abstract

A honeycomb core sandwich structure capable of bearing multidirectional impact relates to the technical field of buffering and energy absorption, comprising two identical sandwich structure panels, a plurality of corrugated honeycomb cores being clamped between the two sandwich structure panels, the corrugated honeycomb core comprising a plurality of minimum corrugated honeycomb units, a plurality of corrugated honeycomb bending surfaces being formed at the joint of adjacent minimum corrugated honeycomb units, and a plurality of the minimum corrugated honeycomb units being sequentially expanded and connected to each other along the in-plane to form the corrugated honeycomb core. The corrugated honeycomb in the present application retains the strong bearing capacity of the honeycomb in the out-of-plane direction, improves the problem of weak bearing capacity of the traditional honeycomb in the in-plane direction, introduces the corrugated and bending surface structure to improve the impact resistance of the honeycomb in the in-plane direction, so that the honeycomb structure has good buffering and bearing capacity for multidirectional and arbitrary angle loads, and the multidirectional impact resistance of the honeycomb structure is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of buffer energy absorption technology, and more specifically, to a honeycomb core sandwich structure capable of withstanding multi-directional impacts. Background Technology

[0002] Honeycomb structures, with their significant advantages such as low density, light weight, high stiffness, controllable deformation, and simple molding process, have been widely used in various fields such as transportation and personal protection. Traditional honeycomb configurations mainly include regular hexagonal honeycombs, circular honeycombs, and triangular honeycombs. These structures exhibit excellent load-bearing capacity in the non-planar directions and show regular progressive folding deformation under non-planar compression, resulting in stable energy absorption. However, when subjected to coplanar compression, the cell walls of traditional honeycomb structures are prone to rotate around their endpoints, leading to cell collapse and a significant reduction in energy absorption. This limitation means that traditional honeycomb structures mainly serve a unidirectional buffering function in practical engineering applications, and they usually need to be installed in their non-planar directions to ensure maximum load-bearing capacity.

[0003] However, in many practical applications of honeycomb sandwich structures, such as front and rear bumpers in car collisions, helicopter cabin structures, and anti-climb devices on high-speed trains, the direction of the impact load often has great uncertainty when subjected to impact. Traditional honeycomb structures, due to their weak coplanar load-bearing capacity, suffer a significant reduction in their overall energy absorption effect in these scenarios.

[0004] Therefore, there is an urgent need for a new type of honeycomb structure that can not only guarantee strong load-bearing capacity in the non-planar directions, but also possess a certain strength in the coplanar direction to meet the load-bearing requirements when the direction of impact loads is uncertain. However, existing honeycomb structures still have significant deficiencies in load-bearing capacity in the coplanar direction, making it difficult to meet this urgent need. Summary of the Invention

[0005] The purpose of this invention is to solve the problems mentioned in the background art, and to propose a honeycomb core sandwich structure that can withstand multi-directional impacts.

[0006] The technical solution adopted by this invention to solve its technical problem is: A honeycomb core sandwich structure capable of withstanding multi-directional impacts includes two identical sandwich structure panels, with a plurality of corrugated honeycomb cores sandwiched between the two sandwich structure panels. The corrugated honeycomb cores include a plurality of minimum corrugated honeycomb units, and a plurality of corrugated honeycomb bending surfaces are formed at the junction of adjacent minimum corrugated honeycomb units. The plurality of minimum corrugated honeycomb units extend in an orderly manner outward from the surface and are interconnected to form a corrugated honeycomb core.

[0007] Furthermore, the six cell walls of the corrugated honeycomb core have regularly arranged corrugations.

[0008] Furthermore, the clamping structure panel and the corrugated honeycomb are bonded together with thermosetting resin adhesive.

[0009] Furthermore, the clamping structure panel is a thin flat plate.

[0010] Furthermore, the minimum corrugated honeycomb unit is composed of three interconnected corrugated honeycomb plates, with each set of three intersecting corrugated honeycomb plates forming a minimum corrugated honeycomb unit.

[0011] Furthermore, the included angle between the neutral planes of adjacent honeycomb corrugated plates is 120°, and the side view of the honeycomb corrugated plate is a curve whose functional relationship satisfies: Where a is the curve amplitude parameter and b is the ripple period parameter.

[0012] Furthermore, the corrugated honeycomb bending surfaces are staggered at the smallest corrugated honeycomb unit, and each period's smallest corrugated honeycomb unit has two bending surfaces.

[0013] Compared with the prior art, the beneficial effects of the present invention are: the corrugated honeycomb in the present invention retains the strong load-bearing capacity in the non-planar direction of the honeycomb, while improving the problem of the weak load-bearing capacity in the coplanar direction of the traditional honeycomb. The corrugated and bent surface structure is introduced to improve the impact resistance of the honeycomb in the coplanar direction, so that the honeycomb structure has good buffering and load-bearing capacity for multi-directional and arbitrary angle loads, and is applicable to a wider range of environments, greatly improving the multi-directional impact resistance of the honeycomb structure. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 A three-dimensional structural diagram of a corrugated honeycomb core structure; Figure 3 This is a three-dimensional structural diagram of the smallest corrugated unit of a corrugated honeycomb. Figure 4 A schematic diagram illustrating the mechanism by which corrugated honeycomb bending surfaces enhance the coplanar load-bearing capacity. Figure 5 This is a schematic diagram showing the compression direction of the honeycomb core; Figure 6 Comparison of stress-strain curves during coplanar compression of corrugated honeycomb structures; Figure 7 A comparison diagram of stress-strain curves in the coplanar direction 1 of a corrugated honeycomb structure and that of a corresponding traditional honeycomb structure; Figure 8 This is a comparison diagram of the stress-strain curves of the corrugated honeycomb structure in two coplanar directions with those of the corresponding traditional honeycomb. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The present invention will be further described with reference to the accompanying drawings and embodiments: like Figures 1-8 As shown, a honeycomb core sandwich structure capable of withstanding multi-directional impacts includes two identical sandwich structure panels 1. A plurality of corrugated honeycomb cores are sandwiched between the two panels. Each corrugated honeycomb core comprises a plurality of minimum corrugated honeycomb cells. A plurality of corrugated honeycomb bending surfaces 3 are formed at the junctions of adjacent minimum corrugated honeycomb cells. The multiple minimum corrugated honeycomb cells extend inwards and outwards in an orderly manner and connect with each other to form the corrugated honeycomb core. This structural design allows the honeycomb core to be evenly distributed and effectively transfer loads, improving the overall load-bearing capacity and stability of the structure.

[0016] Furthermore, the corrugated honeycomb core is an improvement on the traditional hexagonal honeycomb structure, with regularly arranged corrugations introduced on all six cell walls. The clamping structure panel is bonded to the corrugated honeycomb using thermosetting resin. This design retains the advantages of the traditional honeycomb structure and further enhances its load-bearing capacity and energy absorption effect by introducing a corrugated structure.

[0017] Furthermore, the clamping structure panel is a thin flat plate, which mainly serves a supporting function.

[0018] In at least one embodiment, such as Figure 3 As shown, the minimum corrugated honeycomb unit is composed of three interconnected corrugated honeycomb plates 2, and every three intersecting corrugated honeycomb plates with neutral surfaces are connected to form a minimum corrugated honeycomb unit.

[0019] Furthermore, the neutral plane angle between adjacent honeycomb corrugated panels is 120°. This design allows for a more uniform load distribution under stress, improving the energy absorption and stability of the honeycomb structure. The side view of the honeycomb corrugated panel is a curve, and its functional relationship satisfies: Where 'a' is the curve amplitude parameter, which characterizes the magnitude of the corrugated wall's fluctuations. The larger 'a' is, the greater the fluctuations of the corrugated wall. 'b' is the corrugation period parameter, which characterizes the density of the corrugations on the corrugated wall. The smaller 'b' is, the denser the corrugations of the honeycomb.

[0020] In at least one embodiment, the corrugated honeycomb bending surfaces are staggered at the smallest corrugated honeycomb unit, with each cycle's smallest corrugated honeycomb unit having two bending surfaces. Through the interconnection of multiple cycles and multiple cell-level corrugated honeycomb structures, the number of bending surfaces is significantly increased. When the honeycomb structure deforms and absorbs energy, the bending surfaces support two adjacent honeycomb cell walls. The large number of bending surfaces gives the honeycomb structure a remarkably strong resistance to multi-directional impacts. By increasing the number of bending surfaces, the load-bearing capacity of the honeycomb structure in the coplanar direction is further enhanced, resulting in better energy absorption and stability under multi-directional impacts.

[0021] like Figure 4 The diagram illustrates the working mechanism of the corrugated honeycomb bending surface. When subjected to coplanar loads, the honeycomb structure exhibits orderly deformation. When deformation occurs at the corrugated honeycomb bending surface, the upper and lower corrugated honeycomb plates abut against each other due to the presence of the corrugated honeycomb bending surface, providing significant support. Furthermore, since there are multiple bending surfaces between each smallest corrugated honeycomb unit, the overall coplanar load-bearing capacity of the corrugated honeycomb is greatly enhanced.

[0022] The invented corrugated honeycomb model was simulated and analyzed using the numerical simulation software Ls-Dyna. The corrugated plate used in the simulation had a side length of 10 mm and a thickness of 0.15 mm. The corrugation parameters a and b were set to 1.5 and 5 respectively. Minimum corrugated honeycomb elements were constructed using these parameters, and a corrugated honeycomb was generated. The simulation conditions were set so that the nodes at the top of the honeycomb were compressed at a speed of v = 1.25 m / s, and all degrees of freedom of the nodes at the bottom of the corrugated honeycomb were constrained. The honeycomb structure is an orthotropic structure. Its two coplanar, mutually orthogonal directions are referred to as coplanar direction 1 (honeycomb bandwidth direction) and coplanar direction 2 (honeycomb perpendicular to the bandwidth direction). Two different stress-strain curves were output for coplanar direction 1 and coplanar direction 2. The compression direction is illustrated as follows. Figure 5 As shown, the ideal stress-strain curve of the honeycomb structure under working conditions is divided into three segments: elastic segment, plateau segment, and compacted segment. Since the plateau end is the main energy absorption stage of the honeycomb structure, the honeycomb structure after entering the compacted segment can be regarded as having been crushed. Therefore, the simulation curve mainly shows the stress-strain curve results of the elastic segment to plateau segment of the honeycomb deformation. It can be seen that the introduction of honeycomb corrugated structure and bending surface greatly improves the weakness of traditional hexagonal honeycomb in the coplanar direction bearing capacity.

[0023] It should be noted that, due to the distribution characteristics of the bent surfaces in the corrugated honeycomb structure, the supporting capacity of the bent surfaces is relatively weak in the coplanar direction perpendicular to the normals of the two bent surfaces (i.e., the coplanar 1 direction), resulting in... Figure 6 The phenomenon of a large difference in stress-strain curves between two orthogonal coplanar directions in a corrugated honeycomb structure indicates that the load-bearing capacity in coplanar direction 2 is better than that in coplanar direction 1. However, thanks to the introduction of the corrugated honeycomb wall structure, such as... Figure 7As shown, the load-bearing capacity in the coplanar direction 1 is still significantly stronger than that in the corresponding coplanar direction of a traditional hexagonal honeycomb structure, reaching approximately seven times the load-bearing capacity in the coplanar direction 1 of a traditional honeycomb structure. And for the even stronger load-bearing capacity in the coplanar direction 2, such as... Figure 8 As shown, its load-bearing capacity is more than 20 times that of traditional honeycomb structures in two coplanar directions, significantly improving the weakness of traditional honeycomb structures in terms of coplanar load-bearing capacity.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A honeycomb core sandwich structure capable of withstanding multi-directional impacts, characterized in that, It includes two identical sandwich structure panels, with several corrugated honeycomb cores sandwiched between the two sandwich structure panels. The corrugated honeycomb cores include several minimum corrugated honeycomb units. Several corrugated honeycomb bending surfaces are formed at the junction of adjacent minimum corrugated honeycomb units. Multiple minimum corrugated honeycomb units extend in an orderly manner outward from the surface and connect with each other to form a corrugated honeycomb core.

2. The honeycomb core sandwich structure capable of withstanding multi-directional impacts according to claim 1, characterized in that, The corrugated honeycomb core has regularly arranged corrugations on the six cell walls.

3. The honeycomb core sandwich structure capable of withstanding multi-directional impacts according to claim 1 or 2, characterized in that, The clamping structure panel and the corrugated honeycomb are bonded together with thermosetting resin.

4. The honeycomb core sandwich structure capable of withstanding multi-directional impacts according to claim 2, characterized in that, The clamping structure panel is a thin flat plate.

5. The honeycomb core sandwich structure capable of withstanding multi-directional impacts according to claim 2 or 4, characterized in that, The minimum corrugated cell unit is composed of three interconnected corrugated cell plates, with each set of three intersecting corrugated cell plates forming a minimum corrugated cell unit.

6. The honeycomb core sandwich structure capable of withstanding multi-directional impacts according to claim 5, characterized in that, The neutral plane angle between adjacent honeycomb corrugated plates is 120°. The side view of the honeycomb corrugated plate is a curve, and its functional relationship satisfies: Where a is the curve amplitude parameter and b is the ripple period parameter.

7. The honeycomb core sandwich structure capable of withstanding multi-directional impacts according to claim 6, characterized in that, The corrugated honeycomb bending surfaces are staggered at the smallest corrugated honeycomb unit, and each cycle's smallest corrugated honeycomb unit has two bending surfaces.

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