Multidirectional strong energy absorption composite negative Poisson's ratio structure for ship collision protection

Abstract

The invention provides a multi-directional strong energy absorption composite negative poisson ratio structure for ship collision protection, and relates to the technical field of water conservancy project structure protection. Comprising a plurality of negative Poisson's ratio cells arranged in an array, and each negative Poisson's ratio cell comprises four star-shaped structures, four chiral structures and four duplex cross structures; the four star-shaped structures are distributed in an array mode, and the vertexes of the adjacent star-shaped structures are connected. The four chiral structures are respectively arranged in the four star-shaped structures and are connected with the star-shaped structures into a whole; and the four duplex cross structures are respectively arranged in gaps of the adjacent star-shaped structures and are connected with the star-shaped structures into a whole. The structure can be modularly mounted on an anti-collision protective surface of a dam, the outer side of a gate leaf of a navigation gate or the surface of a berthing pier, has excellent multi-directional energy absorption capacity, and can effectively reduce the damage risk of ship collision to a hydraulic structure.

Description

Technical Field

[0001] This invention relates to the field of hydraulic engineering structural protection technology, and more specifically, to a multi-directional strong energy-absorbing composite negative Poisson's ratio structure for ship impact protection. Background Technology

[0002] In water conservancy projects, navigation lock gates, approach channels, and berthing piers are frequently subjected to accidental collisions or berthing impacts from ships. Traditional collision protection methods often employ reinforced concrete piers, rubber fenders, or steel crash barriers. While these structures offer some cushioning, they suffer from low energy absorption efficiency, high structural rigidity, susceptibility to localized damage, and difficult maintenance, making them unsuitable for protecting against collisions with large ships.

[0003] Negative Poisson's ratio refers to the phenomenon where a material expands laterally when stretched axially. This unique tensile expansion deformation mode endows negative Poisson's ratio materials with excellent shear strength, fracture resistance, and good energy absorption performance. However, existing negative Poisson's ratio collision protection structures are mostly used in aerospace, automotive, and other fields, and there is a lack of composite energy absorption designs for hydraulic environments and large-scale ship impacts.

[0004] Negative Poisson's ratio materials are generally classified according to their deformation mechanism and microstructure, such as heterogeneous structures like honeycomb structures, chiral structures, and star-shaped structures. While these structures have achieved some success in energy absorption, they still have the following shortcomings when dealing with ship impacts to dams and navigation facilities: 1. The vast majority of negative Poisson's ratio anti-collision structures are composed of single-cell structures, and the deformation of the internal structure does not have a mutual cancellation effect, resulting in low energy absorption efficiency; 2. Some negative Poisson's ratio collision avoidance structures are composed of multiple cell structures, which have the effect of mutual cancellation of internal structural deformation. However, the negative Poisson's ratio effect is mostly concentrated in the horizontal direction, and the energy absorption effect in the non-horizontal direction is poor. When ships navigate in reservoirs, pilotways, etc., the impact angle is highly uncertain and may impact dams and navigation facilities at an oblique angle. The energy absorption performance of existing structures is significantly insufficient in oblique impact situations, which limits their practical application in the field of ship collision avoidance. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-directional strong energy-absorbing composite negative Poisson's ratio structure for ship impact protection, which can effectively absorb impact energy in both horizontal and non-horizontal directions, while also resisting external impacts and supporting the cell wall of the star-shaped-chiral structure, thus giving the structure a multi-directional, strong energy-absorbing capability.

[0006] The embodiments of the present invention are implemented as follows: This application provides a multi-directional strong energy-absorbing composite negative Poisson's ratio structure for ship impact protection, comprising multiple negative Poisson's ratio cells arranged in an array, wherein the negative Poisson's ratio cells include four star-shaped structures, four chiral structures, and four duplex cross structures. The four star-shaped structures are arranged in an array and the vertices of adjacent star-shaped structures are connected; The four chiral structures are respectively disposed inside the four star-shaped structures and are connected to the star-shaped structures as a whole; The four duplex cross structures are respectively disposed in the gaps between adjacent star structures and are connected to the star structures as a whole.

[0007] Furthermore, based on the aforementioned scheme, the plurality of negative Poisson's ratio cells are arranged periodically along the X-axis and Y-axis in a two-dimensional plane, respectively.

[0008] Furthermore, based on the aforementioned scheme, the star-shaped structure includes four concave arrows, which are symmetrically distributed circumferentially and connected sequentially to form a ring.

[0009] Furthermore, based on the aforementioned scheme, the chiral structure includes a ring and four inclined cell walls disposed around the circumference of the ring. One end of the inclined cell wall is tangent to the ring, and the other end of the inclined cell wall is connected to the connection point of two adjacent concave arrows.

[0010] Furthermore, based on the aforementioned scheme, the double-I-shaped cross structure includes two intersecting I-shaped structures, with the upper and lower flanges of the two I-shaped structures mutually enclosing and connecting to each other and fitting against the edge line of the adjacent concave arrow.

[0011] Furthermore, based on the aforementioned scheme, the inner angle of the concave arrow is 30°.

[0012] Furthermore, based on the aforementioned scheme, the included angle between adjacent inclined cell walls is 90°.

[0013] Furthermore, based on the aforementioned scheme, the material of the negative Poisson's ratio cell is a glass fiber reinforced composite material.

[0014] Furthermore, based on the aforementioned scheme, the thickness of the upper flange, lower flange, and web of the I-shaped structure, as well as the distance between the web and the upper flange and the lower flange, are all equal and greater than the thickness of the inclined cell wall.

[0015] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: This application utilizes a negative Poisson's ratio cell structure, composed of four star-shaped structures, four chiral structures, and four duplex cross structures. Multiple negative Poisson's ratio cells are arranged in an array to form a composite negative Poisson's ratio structure, resulting in superior energy absorption. The negative Poisson's ratio cell structure is composed of four star-shaped structures, four chiral structures, and four duplex cross structures. The four star-shaped structures are arranged in an array with adjacent vertices connected, and the four chiral structures are placed inside the four star-shaped structures. This allows the star-shaped structures and their internal chiral structures to cancel each other out under stress. The duplex cross structures are placed in the gaps between adjacent star-shaped structures, forming an X-shaped structure on their webs. The combined compressive (tensile) energy absorption of the star-shaped and chiral structures with the X-shaped structure effectively absorbs horizontal impact energy. The combined duplex structure effectively absorbs impact energy in both horizontal and non-horizontal directions, while also resisting external impacts and supporting the star-chiral cell walls, giving the structure a multi-directional, strong energy absorption capability. This structure can be modularly installed on the dam's anti-collision surface, the outside of the navigation gate leaf, or the surface of the berthing pier. It has excellent multi-directional energy absorption capacity and can effectively reduce the risk of damage to hydraulic structures caused by ship collisions. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the multi-directional strong energy-absorbing composite negative Poisson's ratio structure for ship impact protection according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a negative Poisson's ratio cell in an embodiment of the present invention; Figure 3 This is a schematic diagram of the star-shaped chiral composite structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the duplex cross structure according to an embodiment of the present invention.

[0018] Icons: 10 - Negative Poisson's ratio cell, 11 - Star-shaped structure, 111 - Concave arrow, 12 - Chiral structure, 121 - Circular ring, 122 - Sloping cell wall, 13 - Digonal cross structure, 131 - I-shaped structure, 132 - X-shaped structure. Detailed Implementation

[0019] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0020] Please refer to Figures 1-4 The diagram shows the overall structure of a multi-directional high-energy-absorbing composite negative Poisson's ratio structure used for ship impact protection. This embodiment provides a multi-directional strong energy-absorbing composite negative Poisson's ratio structure for ship impact protection, including multiple negative Poisson's ratio cells 10 arranged in an array. The negative Poisson's ratio cells 10 include four star-shaped structures 11, four chiral structures 12 and four duplex cross structures 13. The four star-shaped structures 11 are arranged in an array and the vertices of adjacent star-shaped structures 11 are connected; Four chiral structures 12 are respectively disposed inside the four star-shaped structures 11 and connected to the star-shaped structures 11 as a whole; Four duplex cross structures 13 are respectively set in the gaps between adjacent star structures 11 and connected to the star structures 11 as a whole.

[0021] The following will further explain an exemplary embodiment of a multi-directional high-energy-absorbing composite negative Poisson's ratio structure for ship impact protection.

[0022] In some implementations, refer to Figure 1 and Figure 2 Multiple negative Poisson's ratio cells 10 are periodically arranged along the X and Y axes in a two-dimensional plane. Each negative Poisson's ratio cell 10 includes four star-shaped structures 11, four chiral structures 12, and four duplex cross structures 13. The four star-shaped structures 11 are arranged in an array, and the vertices of adjacent star-shaped structures 11 are connected to form the outer wall of the negative Poisson's ratio cell 10, which can directly resist the impact of ships. Each star-shaped structure 11 includes four concave arrows 111, which are symmetrically distributed circumferentially and connected in sequence to form a ring. The four concave arrows 111 have the same structure and size, and their interconnection forms a gap inside for the distribution of the chiral structures 12.

[0023] The four chiral structures 12 are respectively disposed inside the four star-shaped structures 11 and connected to the star-shaped structures 11 to form a star-chiral composite structure. Upon impact, the star-shaped structures 11 and the internal chiral structures 12 have a mutual canceling effect. Specifically, each chiral structure 12 includes a ring 121 and four inclined cell walls 122 disposed circumferentially around the ring 121. One end of each inclined cell wall 122 is tangent to the ring 121, and the other end of each inclined cell wall 122 is connected to the connection point of two adjacent concave arrows 111, as shown below. Figure 3 As shown.

[0024] The four duplex cross structures 13 are respectively disposed within the gaps of adjacent star-shaped structures 11 and connected to the star-shaped structures 11 as a whole, forming an X-shaped-I-shaped composite structure. Specifically, the duplex cross structure 13 includes two intersecting I-shaped structures 131, the webs of the two I-shaped structures 131 intersecting to form an X-shaped structure 132, and the upper and lower flanges of the two I-shaped structures 131 mutually enclosing and connecting with the edge lines of adjacent concave arrow 111 to form the duplex cross structure 13. Figure 4 As shown. The combined compressive (tensile) energy absorption effect of the star-shaped-chiral composite structure and the duplex cross structure 13 can effectively absorb the multi-directional impact energy during a ship collision.

[0025] Specifically, in impact direction 1, the star-chiral composite structure first compresses and expands, absorbing some of the horizontal impact energy. The force is then transmitted to the subsequently connected X-type-I-type composite structure, which also compresses and expands, further absorbing horizontal impact energy. This process sequentially transmits force to the structures behind it, resulting in a good absorption effect for horizontal impact energy. In impact direction 2 / 3, the cell wall of the star-shaped structure 11 first compresses and transmits the force to the X-type-I-type composite structure. The X-type-I-type composite structure deforms, absorbing some of the impact energy while simultaneously supporting the cell wall of the star-shaped structure 11. This process sequentially transmits force to the structures behind it, resulting in a good absorption effect for non-horizontal impact energy. In impact direction 4, the X-type structure 132 first compresses and expands, absorbing some horizontal impact energy. The force is then sequentially transmitted to the subsequently connected X-type structure 132, further absorbing horizontal impact energy, resulting in a good absorption effect for horizontal impact energy.

[0026] As a preferred implementation method, refer to Figure 3 The inner angle of the concave arrow 111 is 30°, and the included angle of the adjacent inclined cell walls 122 is 90°. Through the above angle design, the negative Poisson's ratio cell 10 can be arranged in a regular periodic manner, and the star structure 11, chiral structure 12 and duplex cross structure 13 can be stably connected to form a stable negative Poisson's ratio composite structure.

[0027] As a preferred implementation method, refer to Figure 4 The thickness t of the upper flange, lower flange, and web of the aforementioned I-shaped structure 131, as well as the distance t between the web and the upper and lower flanges respectively, are all equal and greater than the thickness of the inclined cell wall 122, such as... Figure 4 As shown, this enables the duplex cross structure 13 to uniformly absorb impact energy from all directions, improving the stability of the duplex cross structure 13 and thus improving the stability of the negative Poisson's ratio cell 10.

[0028] As a preferred embodiment, the material of the negative Poisson's ratio cell 10 is a glass fiber reinforced composite material, or other negative Poisson's ratio materials, so that it has a better energy absorption effect.

[0029] As a preferred implementation, the connections between the negative Poisson's ratio cells 10 are made by welding or other integral connection methods to ensure stable connection.

[0030] Furthermore, unless otherwise explicitly specified or limited, the terms "installation" and "connection" in this application embodiment should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "upper," "lower," "left," "right," "inner," "outer," and "side," etc., are merely for reference to the direction in the accompanying drawings or the usual placement of the product during use. They are only for clearly describing this application and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application. The terms "first," "second," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance; "multiple" refers to at least two. In this application embodiment, the limitations on relative positional relationships such as parallel, perpendicular, and aligned are all relative to the current technological level and are not absolutely strict limitations. Slight deviations are allowed; approximations of parallel, perpendicular, and aligned are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees.

[0031] The above are only some embodiments and implementation methods of this application. The protection scope of this application is not limited thereto. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Any combination of features in different embodiments is also within the protection scope of this application. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A multi-axial high energy absorbing composite negative Poisson's ratio structure for ship impact protection, characterized in that, The negative Poisson's ratio cell comprises four star structures, four chiral structures and four double cross structures. The four star structures are arranged in an array and the vertices of adjacent star structures are connected. The four chiral structures are arranged in the interiors of the four star structures and are integrated with the star structures. The four double cross structures are arranged in the gaps between adjacent star structures and are integrated with the star structures.

2. The multi-axial high energy absorbing composite negative Poisson's ratio structure for ship collision protection according to claim 1, characterized in that, The plurality of negative Poisson's ratio cells are periodically arranged along the X-axis and the Y-axis in a two-dimensional plane.

3. The multi-axial high energy absorbing composite negative Poisson's ratio structure for ship collision protection according to claim 1, characterized in that, The star structure comprises four concave arrows which are symmetrically distributed in a circumferential direction and are sequentially connected to form a ring.

4. The multi-axial high energy absorbing composite negative Poisson's ratio structure for ship collision protection according to claim 3, characterized in that, The chiral structure comprises a circular ring and four inclined cell walls arranged in the circumferential direction of the circular ring, one end of the inclined cell wall is tangent to the circular ring, and the other end of the inclined cell wall is connected to the connection point of adjacent two concave arrows.

5. The multi-axial high energy absorbing composite negative Poisson's ratio structure for ship collision protection according to claim 4, characterized in that, The double cross structure comprises two cross-connected I-shaped structures, the upper flange and the lower flange of the two I-shaped structures are connected to each other and are connected to the edge line of adjacent concave arrows.

6. The multi-axial high energy absorbing composite negative Poisson's ratio structure for ship collision protection according to claim 3, characterized in that, The internal angle of the concave arrow is 30°.

7. The multi-axial high energy absorbing composite negative Poisson's ratio structure for ship collision protection according to claim 4, characterized in that, The included angle between adjacent inclined cell walls is 90°.

8. The multi-axial high energy absorbing composite negative Poisson's ratio structure for ship collision protection of claim 1, wherein, The material of the negative Poisson's ratio cell is glass fiber reinforced composite material.

9. The multi-axial high energy absorbing composite negative Poisson's ratio structure for ship collision protection according to claim 5, characterized in that, The thicknesses of the upper flange, the lower flange and the web of the I-shaped structure and the distances between the web and the upper flange and the lower flange are equal and greater than the thickness of the inclined cell wall.

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