An offshore structure anti-collision structure with negative Poisson's ratio effect

Abstract

The invention discloses an offshore structure anti-collision structure with negative Poisson's ratio effect, which relates to the field of offshore building safety. The key points of the technical solution are that the anti-collision structure consists of an outer anti-collision plate, an inner anti-collision plate and an energy absorption device therebetween, wherein the energy absorption device comprises a front oncoming collision plate, a rear top plate and a negative Poisson's ratio chiral rotation structure in the middle, wherein the negative Poisson's ratio chiral rotation structure comprises a plurality of structural units, wherein the plurality of structural units are mutually adhered and arranged in a plane direction to form a plane spreading state, wherein in the vertical direction, a plurality of layers of structural unit plane spreading structures with equal surface distances are set between the front oncoming collision plate and the rear top plate, and the structural units are bonded to the front oncoming collision plate and the rear top plate; the structure is based on a negative Poisson's ratio structure, and utilizes the reasonable combination of a plastic material aluminum alloy and an elastic material rubber, thereby effectively improving the buffering energy absorption characteristics of the negative Poisson's ratio structure when used as an anti-collision device, thereby improving the anti-collision performance of the offshore structure.

Description

Technical Field

[0001] The invention relates to the technical field of offshore building safety, in particular to an offshore structure anti-collision structure with negative Poisson's ratio effect. Background Art

[0002] In recent years, with the attention of the engineering and scientific communities, various types of anti-collision devices for offshore structures have emerged. Their structural forms mainly include fenders, concrete structures, steel pontoons, gravity-type, cluster piles, anti-collision piers, artificial islands, etc. According to the construction characteristics of the anti-collision device, it can be divided into indirect anti-collision devices and direct anti-collision devices. The indirect type is to prevent ships from colliding with offshore structures by setting pile groups, artificial islands and other structures around the marine structure. This type of anti-collision measure has high construction costs and difficulty, and only protects the offshore structure without considering the protection of the ship itself. Direct protection is to install a flexible buffer energy-absorbing device around the offshore structure, and release the energy during the impact through the deformation ability of the flexible energy-absorbing device itself, so as to protect both the offshore structure and the ship.

[0003] As a new type of metamaterial structure, the negative Poisson's ratio structure has an advantageous energy absorption characteristic that can well meet the requirements of flexible energy absorption devices. The negative Poisson's ratio structures currently proposed mostly use plastic material aluminum alloy. Although they can achieve lightweight and high energy absorption characteristics, they lack the ability of elastic materials to restore their original structural state after impact. The aluminum alloy itself is severely damaged after impact, and the excessive stiffness during initial contact will also cause damage to the hull. Therefore, the combination of plastic materials and elastic materials can be considered to improve the energy absorption characteristics of the overall structure through the complementary advantages of the two. Summary of the invention

[0004] The purpose of the present invention is to provide an offshore structure anti-collision structure with a negative Poisson's ratio effect. The structure is based on a negative Poisson's ratio structure and utilizes a reasonable combination of a plastic material aluminum alloy and an elastic material rubber to effectively improve the buffering and energy absorption characteristics of the negative Poisson's ratio structure when used as an anti-collision device, thereby improving the anti-collision performance of the offshore structure.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A collision avoidance structure for an offshore structure with a negative Poisson's ratio effect, the collision avoidance structure consisting of an outer collision avoidance plate, an inner collision avoidance plate and an energy absorption device therebetween, the energy absorption device comprising a front oncoming collision plate, a rear top plate and a negative Poisson's ratio chiral rotation structure in the middle, the negative Poisson's ratio chiral rotation structure comprising a plurality of structural units, the plurality of structural units being bonded to each other in a planar direction to form a planar spreading state, in a vertical direction, a multi-layer planar spreading structure of structural units with equal surface spacing is set between the front oncoming collision plate and the rear top plate, and the structural units are bonded to the front oncoming collision plate and the rear top plate.

[0007] As a preferred solution of the present invention, the outer anti-collision plate and the inner anti-collision plate are both made of glass fiber reinforced composite material.

[0008] By adopting the above technical scheme, the present invention uses glass fiber reinforced composite materials as the manufacturing materials of the outer anti-collision plate and the inner anti-collision plate. Since the glass fiber reinforced composite materials have good physical and chemical properties such as soft material, high strength and corrosion resistance, they can improve the overall structural stability and reduce the weight of the overall structure.

[0009] As a preferred solution of the present invention, the front head-on collision plate and the rear top plate are both made of plastically deformed aluminum alloy materials, the front head-on collision plate and the outer anti-collision plate are bonded and fixed by high-strength epoxy resin glue, and the rear top plate and the inner anti-collision plate are bonded and fixed by high-strength epoxy resin glue.

[0010] By adopting the above technical solution, since the device is used at sea and in seawater, a high-strength epoxy resin glue with good acid, alkali and corrosion resistance is used for bonding, and the structural stability after connection is high.

[0011] As a preferred embodiment of the present invention, the structural unit is composed of single-cell components, each structural unit is composed of five single-cell components, one of the five single-cell components is selected as the center component, and the remaining four single-cell components are bonded and fixed along the four vertices of the center component, and the two structural units are bonded and fixed by overlapping the side edges of one of the single-cell components.

[0012] As a preferred solution of the present invention, the angle between each of the unit cell components and the center piece is 0-45°.

[0013] By adopting the above technical solution, due to the existence of the rotation angle, when the anti-collision device is hit by a ship, the four unit cell components initially deform into a circle and rotate around the central component. During this process, the initial stress of the entire structure is a very small value, which effectively reduces the risk of structural damage caused by excessive initial stress.

[0014] As a preferred solution of the present invention, the unit cell component includes a square frame and a star-shaped rubber block inside. The square frame is made of plastically deformed aluminum alloy material. A star-shaped connecting rod is connected inside the square frame. The star-shaped rubber block is bonded inside the star-shaped connecting rod. The middle part of the star-shaped rubber block is star-shaped and hollow.

[0015] By adopting the above technical solution, the rubber with high elastic deformation forms a negative Poisson's ratio structure, which has the advantage that the energy absorption characteristics can well meet the requirements of the flexible energy absorption device. While absorbing high energy, it can restore the original structural state after impact, thereby reducing its own damage and can be recycled.

[0016] As a preferred solution of the present invention, the outer anti-collision plate has the same height as the inner anti-collision plate and the square frame.

[0017] As a preferred solution of the present invention, the bonding points between the structural unit and the front oncoming collision plate and the rear top plate are the vertices of the unit cell components.

[0018] In summary, the beneficial technical effects of the present invention are as follows: the structure is based on a negative Poisson's ratio structure, and utilizes a reasonable combination of a plastic material aluminum alloy and an elastic material rubber, which effectively improves the buffering and energy absorption characteristics of the negative Poisson's ratio structure when used as an anti-collision device. When an offshore structure is subjected to an external impact, the impact force is first attenuated to a certain extent by the glass fiber reinforced composite material, and then transmitted to the internal energy absorption structure. The deformation energy absorption of the aluminum alloy matrix material and the rubber structure in the negative Poisson's ratio chiral rotation structure plays a certain buffering role, greatly reducing the impact force generated by the ship, thereby improving the anti-collision performance of the offshore structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 Schematic diagram of the structure of an offshore structure anti-collision structure with negative Poisson's ratio effect in this embodiment;

[0021] Figure 2 This is a schematic structural diagram of an energy absorption device of an offshore structure anti-collision structure with a negative Poisson's ratio effect according to this embodiment;

[0022] Figure 3 Schematic diagram of negative Poisson's ratio chiral rotation structure of an offshore structure anti-collision structure with negative Poisson's ratio effect in this embodiment;

[0023] Figure 4 This is a schematic structural diagram of a unit cell component of an offshore structure anti-collision structure with a negative Poisson's ratio effect according to this embodiment;

[0024] Figure 5 Schematic diagram of a model containing a rubber structure (left figure) and a model without a rubber structure (right figure) in this embodiment;

[0025] Figure 6 is a schematic diagram of the changing state of the energy absorbing device during an actual collision in this embodiment;

[0026] Figure 7 3 is a stress-strain curve diagram of the energy absorbing device with a rubber structure and the energy absorbing device without a rubber structure in this embodiment.

[0027] In the figure, 1. outer anti-collision plate; 2. inner anti-collision plate; 3. energy absorption device; 4. front head-on collision plate; 5. rear top plate; 6. negative Poisson's ratio chiral rotation structure; 7. structural unit; 8. star-shaped rubber block; 9. square frame; 10. unit cell component; 11. star-shaped connecting rod. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-Figure 7 The present invention provides a technical solution: an offshore structure anti-collision structure with a negative Poisson's ratio effect, the anti-collision structure is composed of an outer anti-collision plate 1, an inner anti-collision plate 2 and an energy absorption device 3 therebetween, the energy absorption device 3 comprises a front oncoming collision plate 4, a rear top plate 5 and a negative Poisson's ratio chiral rotation structure 6 in the middle, the negative Poisson's ratio chiral rotation structure 6 comprises a plurality of structural units 7, the plurality of structural units 7 are bonded to each other in a plane direction to form a plane spreading state, in a vertical direction, a multi-layer plane spreading structure of structural units with equal surface spacing is set between the front oncoming collision plate 4 and the rear top plate 5, and the structural unit 7 is bonded to the front oncoming collision plate 4 and the rear top plate 5.

[0031] Among them, the outer anti-collision plate 1 and the inner anti-collision plate 2 are both made of glass fiber reinforced composite materials; similarly, the front oncoming collision plate 4 and the rear top plate 5 are both made of plastically deformed aluminum alloy materials, the front oncoming collision plate 4 and the outer anti-collision plate 1 are bonded and fixed by high-strength epoxy resin glue, and the rear top plate 5 and the inner anti-collision plate 2 are bonded and fixed by high-strength epoxy resin glue.

[0032] Specifically, the structural unit 7 is composed of single-cell components 10, each structural unit 7 includes five single-cell components 10, one of the five single-cell components 10 is selected as the center component, and the other four single-cell components 10 are bonded and fixed along the four vertices of the center component, and the two structural units 7 are bonded and fixed by overlapping the side edges of one of the single-cell components 10.

[0033] The angle between each of the unit cell components 10 and the center piece is 0-45°, and the angle is marked as θ. Figure 3 shown.

[0034] The single cell component 10 includes a square frame 9 and a star-shaped rubber block 8 inside. The square frame 9 is made of plastically deformed aluminum alloy material. A star-shaped connecting rod 11 is connected inside the square frame 9. The star-shaped rubber block 8 is bonded to the inside of the star-shaped connecting rod 11 by JQ-1 adhesive. The middle part of the star-shaped rubber block 8 is star-shaped and hollow.

[0035] In this embodiment, the angle θ between the unit cell component 10 and the center piece is set to 45°.

[0036] The outer anti-collision plate 1 is consistent with the inner anti-collision plate 2 and the square frame 9 in height, and the bonding point between the structural unit 7 and the front head-on collision plate 4 and the rear top plate 5 is the vertex of the unit cell component 10 therein.

[0037] The negative Poisson's ratio chiral rotation anti-collision structure is manufactured according to the size of the offshore structure and then wrapped around the outside of the offshore structure.

[0038] When an offshore structure is hit by an external impact, the impact force is first attenuated by the glass fiber reinforced composite material and then transmitted to the internal energy absorption structure. The aluminum alloy matrix material and the rubber structure in the negative Poisson's ratio chiral rotation structure 6 absorb energy through deformation, which plays a certain buffering role and greatly reduces the impact force generated by the ship.

[0039] The finite element simulation software ABAQUS was used to perform a quasi-static compression simulation of the energy absorbing device in the proposed structure, wherein the energy absorbing device adopts the energy absorbing device in the above embodiment and a selected comparative example.

[0040] The comparative example is an energy absorbing device without star-shaped rubber blocks.

[0041] With the help of finite element simulation software ABAQUS, quasi-static compression simulation of the two energy absorbing devices was carried out, and two 3×3 energy absorbing device models with and without star-shaped rubber structure were established for comparative simulation to illustrate the advantageous energy absorption effect of the energy absorbing device after adding the star-shaped rubber block structure.

[0042] Figure 6The deformation of the energy-absorbing device under a loading speed of 3 mm / min. As can be seen from the figure, under the longitudinal velocity load, the rotating square unit first rotates, causing the entire energy-absorbing structure to have an obvious lateral contraction trend, showing a negative Poisson's ratio effect. At the end of the rotational movement, the stress-strain curve of the entire energy-absorbing structure began to show an upward trend. Under the continuous action of the velocity load, the square units at the upper and lower ends of the energy-absorbing structure began to buckle and deform, causing the stress-strain curve of the energy-absorbing structure to fluctuate slightly, but the close contact between the square units caused the stress-strain curve of the entire energy-absorbing structure to remain on an upward trend. During this process, the energy-absorbing device is still in a state of continuous energy absorption, has not entered the densification stage, and the stress-strain curve has not increased sharply. As the stress-strain curve continues to rise, the external load energy absorbed by the energy-absorbing device is also increasing.

[0043] pass Figure 7 It can be seen from the stress-strain curves of the energy absorbing device with rubber structure and the energy absorbing device without rubber structure that the load-bearing capacity of the energy absorbing device with rubber structure can reach twice that of the energy absorbing device without star-shaped rubber block (curve W is the energy absorbing device with rubber structure, and curve M is the energy absorbing device without rubber structure). Adding a star-shaped rubber block structure to the plastic energy absorbing device can significantly improve the energy absorption effect of the energy absorbing device.

Claims

1. An offshore structure anti-collision structure with negative Poisson's ratio effect, characterized in that: The anti-collision structure is composed of an outer anti-collision plate (1), an inner anti-collision plate (2) and an energy absorbing device (3) therebetween; the energy absorbing device (3) is composed of a front oncoming collision plate (4), a rear top plate (5) and a negative Poisson's ratio chiral rotation structure (6) in the middle; the negative Poisson's ratio chiral rotation structure (6) includes a plurality of structural units (7); the plurality of structural units (7) are bonded to each other in a plane direction to form a plane spreading state; in a vertical direction, a plurality of structural unit plane spreading structures with equal plane spacing are set between the front oncoming collision plate (4) and the rear top plate (5); the structural units (7) are bonded to the front oncoming collision plate (4) and the rear top plate (5); The structural unit (7) is composed of single-cell components (10), each structural unit (7) is composed of five single-cell components (10), one of the five single-cell components (10) is selected as a center component, and the remaining four single-cell components (10) are bonded and fixed along the four vertices of the center component, and the two structural units (7) are bonded and fixed by overlapping the side edges of one of the single-cell components (10), and the angles between the remaining four single-cell components (10) and the center component are all 45°; The unit cell component (10) comprises a square frame (9) and a star-shaped rubber block (8) connected inside. The square frame (9) is made of a plastically deformed aluminum alloy material. A star-shaped connecting rod (11) is connected inside the square frame (9). The star-shaped rubber block (8) is bonded inside the star-shaped connecting rod (11). The middle part of the star-shaped rubber block (8) is star-shaped and hollow.

2. The offshore structure anti-collision structure with negative Poisson's ratio effect according to claim 1, characterized in that: The outer anti-collision plate (1) and the inner anti-collision plate (2) are both made of glass fiber reinforced composite material.

3. The offshore structure anti-collision structure with negative Poisson's ratio effect according to claim 1, characterized in that: The front head-on collision plate (4) and the rear top plate (5) are both made of plastically deformed aluminum alloy material; the front head-on collision plate (4) and the outer anti-collision plate (1) are bonded and fixed by high-strength epoxy resin glue; and the rear top plate (5) and the inner anti-collision plate (2) are bonded and fixed by high-strength epoxy resin glue.

4. The offshore structure anti-collision structure with negative Poisson's ratio effect according to claim 1, characterized in that: The outer anti-collision plate (1) is at the same height as the inner anti-collision plate (2) and the square frame (9).

5. The offshore structure anti-collision structure with negative Poisson's ratio effect according to claim 1, characterized in that: The bonding points between the structural unit (7) and the front collision plate (4) and the rear top plate (5) are the vertices of the unit cell components (10) therein.

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