Bidirectional fusion thin-walled tube impact-resistant protection structure

Abstract

The invention aims to provide a bidirectional fusion thin-walled tube impact-resistant protection structure applied to a sandwich structure core layer and application, and aims to solve the problems that an existing sandwich structure is generally high in initial peak load, limited in energy absorption capacity, insufficient in overall deformation stability and the like under the action of impact load. In order to achieve the purpose, the anti-impact protection structure adopts a bidirectional fused thin-walled tube configuration and is characterized in that two groups of thin-walled tube units are arranged according to mutually orthogonal spatial orientation, one group of thin-walled tubes rotate by 90 degrees relative to the other group of thin-walled tubes, and the other group of thin-walled tubes rotate by 90 degrees relative to the other group of thin-walled tubes. And then forming an integrated bidirectional fusion thin-walled tube structure through Boolean fusion operation. A sandwich structure core layer with two-dimensional array characteristics can be constructed and formed by arranging a plurality of thin-walled tube units in a staggered manner and fusing the thin-walled tube units with one another.

Description

Technical Field

[0001] This invention belongs to the field of impact protection technology, specifically relating to a modular "sandwich" core structure unit for dynamic load protection: a bidirectional fused thin-walled tube impact protection structure. Background Technology

[0002] Constant-section thin-walled tube structures (such as circular, square, and polygonal tubes) are widely used in energy absorption protection and impact resistance engineering due to their mature manufacturing process, simple structural form, and high specific strength. They are also frequently used as the load-bearing core layer in sandwich structures. However, under axial compressive loads, these traditional thin-walled tubes still have several mechanical limitations that need to be overcome. On the one hand, constant-section thin-walled tubes often experience a significant load surge in the initial stage of crushing, and their force-displacement response curves show a high initial peak force. Under impact or transient load conditions, this characteristic can easily lead to excessive impact transmission effects, thus adversely affecting the main structure or the protected object. On the other hand, after entering the buckling stage, the wrinkling deformation mode of thin-walled tubes is relatively simple, the participation of plastic deformation is limited, the stable energy absorption range is short, and the overall energy dissipation capacity is difficult to fully utilize.

[0003] To address the aforementioned issues, existing research has attempted to regulate the axial crush response of thin-walled tubes through methods such as wall thickness gradient design, prefabricated creases, and parallel multicellular structures. While these methods can improve local mechanical properties to some extent, they generally struggle to simultaneously achieve effective suppression of initial peak loads and a simultaneous improvement in sustained energy absorption capacity. Furthermore, such improvement schemes often involve increased structural complexity or demanding processing requirements, thus limiting their practical engineering applications.

[0004] Therefore, while considering the lightweight characteristics and manufacturing feasibility of thin-walled structures, how to smooth out the initial peak load during crushing and further enhance the energy absorption efficiency of the structure during crushing has become a key technical problem that urgently needs to be solved in the core layer optimization design of sandwich structures. Based on this, this invention proposes a bidirectional fusion design method for thin-walled tubes. By introducing an innovative fusion configuration based on traditional rectangular thin-walled tubes, the force transmission path during crushing is effectively adjusted, the peak load is weakened, and the structure is encouraged to form a more complex and complete plastic hinge evolution mode during crushing, thereby significantly improving energy absorption performance. This provides a new core layer solution for high-performance sandwich structures that balances mechanical performance and engineering feasibility. Summary of the Invention

[0005] This invention aims to propose a bidirectional fused thin-walled tube impact-resistant protection structure and its application in the core layer of a sandwich structure, addressing the common problems of high initial peak load, limited energy absorption capacity, and insufficient overall deformation stability in existing sandwich structures under impact loads. To achieve the above objectives, the impact-resistant protection structure of this invention adopts a bidirectional fused thin-walled tube configuration, characterized by: two sets of thin-walled tube units arranged in mutually orthogonal spatial orientations, with one set of thin-walled tubes rotated 90° relative to the other set around its axis, and then forming an integrated bidirectional fused thin-walled tube structure through Boolean fusion operations. By staggering and fusing multiple thin-walled tube units, a sandwich structure core layer with two-dimensional array characteristics can be constructed. Furthermore, the bidirectional fused thin-walled tube core layer is disposed between the upper and lower panels and fixedly connected to the top and bottom plates respectively, thereby forming an integral sandwich structure. This structure can effectively control the crushing deformation process under impact loads, reduce the initial peak load, enhance the participation of plastic deformation, improve energy absorption efficiency and structural stability, and is suitable for the field of impact protection.

[0006] The structural technical solution proposed in this invention is:

[0007] This invention provides a bidirectional fused thin-walled tube impact-resistant protection structure, the structure comprising several cells, each cell consisting of thin-walled tubes arranged orthogonally to each other, with the axes of two thin-walled tubes perpendicular, one of which is defined as a horizontal tube and the other as a vertical tube; When the thin-walled tube is a rectangular tube, the edge (ridge) of one rectangular tube intersects the axis of another rectangular tube; When the thin-walled tube is a circular tube, the wall of one circular tube intersects the axis of another circular tube at a single point (i.e., there is only one point of intersection). When the thin-walled tube is a hexagonal tube, the edge (ridge) of one hexagonal tube intersects the axis of another hexagonal tube perpendicularly; Orthogonally arranged thin-walled tubes are arrayed in an alternating manner and superimposed through Boolean operations to form a two-dimensional array-type "sandwich" core structure. The core layer is placed between the top plate and the bottom plate and is fixedly connected to the top plate and the bottom plate, thus forming an integral "sandwich" core structure.

[0008] When forming an array, two adjacent horizontal tubes intersect the axis of the same vertical tube, that is, a horizontal tube is embedded on the left side of the vertical tube and another horizontal tube is embedded on the right side; This invention discloses a bidirectional fused thin-walled tube impact-resistant protective structure, belonging to the field of protective structure design. The structure consists of two sets of orthogonally arranged thin-walled tubes, with their axes rotated 90° relative to each other and pointing in two orthogonal directions. These tubes are fused to form an interlaced array structure, thus constituting the core layer of a sandwich structure. The thin-walled tubes can be circular, rectangular, or hexagonal. The wall of the circular tube intersects the axis of the other set of circular tubes at a single point; one side of the rectangular tube intersects the axis of the other set of rectangular tubes; and the centerline of the rectangular face of the hexagonal tube intersects perpendicularly with the axis of the other set of hexagonal tubes. Through this interlaced fusion, a stable plastic deformation mode can be formed during crushing, reducing the initial peak load and improving energy absorption efficiency. When rectangular tubes are used, the core layer has self-locking properties, effectively preventing lateral slippage of the unit. The core layer is placed between and fixedly connected to the top and bottom plates, forming an integral sandwich structure suitable for impact protection and blast protection engineering fields.

[0009] The beneficial effects of this invention are: By merging thin-walled tubes in two orthogonal directions, prefabricated defects are formed in the transverse thin-walled tubes along the axial direction of the longitudinal thin-walled tubes. This effectively weakens the initial peak load of the longitudinal thin-walled tubes in the early stage of structural crushing, thus avoiding excessive instantaneous impact force.

[0010] Thin-walled tubes in two directions form a structural connection at the fusion point, which can induce multiple complex plastic hinge points during the crushing process, thereby prolonging the stable crushing stage of the structure and improving the energy absorption efficiency per unit mass.

[0011] By interlacing orthogonally oriented thin-walled tubes, the core structure forms a two-dimensional array arrangement. The interlocking of these thin-walled units effectively suppresses lateral slippage under out-of-plane impact loads, enhancing the overall structure's impact resistance and reliability. Attached Figure Description

[0012] Figure 1 A two-dimensional array of bidirectional fused thin-walled tube impact-resistant protective structures formed by rectangular tubes; Figure 2 It is a two-way fused thin-walled tube impact-resistant protective structure formed by circular tubes; Figure 3 It is a two-way fused thin-walled tube impact-resistant protective structure formed by hexagonal tubes; Detailed Implementation To make the technical solution of the present invention clearer, the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] like Figure 1 , 2As shown in Figure 3, the present invention provides a bidirectional fusion thin-walled tube impact-resistant protection structure. The structure includes several cells, each cell consisting of thin-walled tubes arranged orthogonally to each other. The axes of two thin-walled tubes are perpendicular, one of which is defined as a horizontal tube and the other as a vertical tube. When the thin-walled tube is a rectangular tube, the edge (ridge) of one rectangular tube intersects the axis of another rectangular tube; When the thin-walled tube is a circular tube, the wall of one circular tube intersects the axis of another circular tube at a single point (i.e., there is only one point of intersection). When the thin-walled tube is a hexagonal tube, the edge (ridge) of one hexagonal tube intersects the axis of another hexagonal tube perpendicularly; Orthogonally arranged thin-walled tubes are arrayed in an alternating manner and superimposed through Boolean operations to form a two-dimensional array-type "sandwich" core structure. The core layer is placed between the top plate and the bottom plate and is fixedly connected to the top plate and the bottom plate, thus forming an integral "sandwich" core structure.

[0014] When forming an array, two adjacent horizontal tubes intersect the axis of the same vertical tube, that is, a horizontal tube is embedded on the left side of the vertical tube and another horizontal tube is embedded on the right side; This invention relates to a bidirectional fused thin-walled tube impact-resistant protective structure for the core layer of a sandwich structure. The structure includes a core layer 1, a top plate 2, and a bottom plate 3. The core layer 1 is formed by the interlacing of two sets of orthogonally arranged thin-walled tubes. The core layer 1 is located between the top plate 2 and the bottom plate 3, and is in contact with and fixedly connected to both plates, thus forming a complete sandwich structure. During use, both the top plate 2 and the bottom plate 3 can serve as impact-bearing surfaces. When an external impact load is applied, the impact force is transmitted to the core layer 1 through the top plate 2 or the bottom plate 3; when an explosive load is applied, the top plate 2 or the bottom plate 3 serves as the blast-facing surface, and the explosive impact force is also transmitted to the core layer 1 through it. During the stress process, the core layer 1 undergoes plastic deformation, dissipating the impact energy through a gradual crushing process, thereby obtaining a relatively stable crushing force curve at the stress output end and reducing the impact on the protected object.

[0015] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A bidirectional fused thin-walled tube impact-resistant protective structure, characterized in that: The protective structure comprises several cells, each cell consisting of thin-walled tubes arranged orthogonally to each other, with the axes of the two thin-walled tubes perpendicular to each other.

2. The bidirectional fused thin-walled tube impact-resistant protection structure according to claim 1, characterized in that: The thin-walled tube is a rectangular tube, with one side of the rectangular tube intersecting the axis of the other rectangular tube.

3. The bidirectional fused thin-walled tube impact-resistant protection structure according to claim 1, characterized in that: The thin-walled tube is a circular tube, and the wall of one of the circular tubes intersects the axis of the other circular tube at a single point.

4. The bidirectional fused thin-walled tube impact-resistant protection structure according to claim 1, characterized in that: The thin-walled tube is a hexagonal tube, with one side of the hexagonal tube intersecting the axis of the other hexagonal tube perpendicularly.

5. An application of the bidirectional fused thin-walled tube impact-resistant protection structure as described in claim 1, characterized in that: Orthogonally arranged thin-walled tubes form an array in an interlaced manner and are superimposed through Boolean operations to form a two-dimensional array-type "sandwich" core structure.

6. The application of the bidirectional fused thin-walled tube impact-resistant protection structure according to claim 5, characterized in that: The core layer is placed between the top plate and the bottom plate and is fixedly connected to the top plate and the bottom plate, thus forming an overall "sandwich" sandwich structure.

7. The application of the bidirectional fused thin-walled tube impact-resistant protection structure according to claim 5, characterized in that: In each cell, thin-walled tubes are orthogonally arranged, one is a horizontal tube and the other is a vertical tube. When they form an array, the axis of two adjacent horizontal tubes intersects with the axis of the same vertical tube. That is, a horizontal tube is embedded to the left of the vertical tube and another horizontal tube is embedded to the right.

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