CN110984417A - Anti-collision device combining chiral negative Poisson ratio structure and honeycomb structure - Google Patents
Anti-collision device combining chiral negative Poisson ratio structure and honeycomb structure Download PDFInfo
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- CN110984417A CN110984417A CN201911308941.0A CN201911308941A CN110984417A CN 110984417 A CN110984417 A CN 110984417A CN 201911308941 A CN201911308941 A CN 201911308941A CN 110984417 A CN110984417 A CN 110984417A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/20—Equipment for shipping on coasts, in harbours or on other fixed marine structures, e.g. bollards
- E02B3/26—Fenders
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention relates to an anti-collision device combining a manual negative Poisson ratio structure and a honeycomb structure, and belongs to the technical field of impact protection devices. The anti-collision device comprises an anti-collision device, wherein the anti-collision device is provided with a rigid inner cushion layer, a chiral negative Poisson's ratio layer, a rigid middle cushion layer, a honeycomb layer and a rigid skin from inside to outside, the chiral negative Poisson's ratio layer is a chiral negative Poisson's ratio structure arranged along the in-plane direction, the honeycomb layer is a honeycomb structure arranged along the out-of-plane direction, the rigid inner cushion layer, the rigid middle cushion layer and the rigid skin are fixedly connected with adjacent layers, and an anti-corrosion material can be sprayed on the outer surface of the rigid skin used in a high-corrosiv. The invention gives full play to the characteristics of light energy absorption of the porous material and the good collision resistance performance of the negative Poisson ratio structure, has the advantages of light weight, good energy absorption, continuous impact resistance and easy repair compared with the traditional anti-collision device, and can be widely applied to the field of safety protection of land and ocean building structures.
Description
Technical Field
The invention relates to an anti-collision device combining a manual negative Poisson ratio structure and a honeycomb structure, and belongs to the technical field of impact protection devices.
Background
As a light porous structure, the negative Poisson ratio structure has the characteristic of transverse expansion or contraction when bearing longitudinal tension and compression loads, and the anti-conventional deformation mode has unique advantages in the fields of anti-explosion and impact resistance of building structures. When a negative poisson's ratio structure is subjected to an impact load (caused by a collision or explosion of a vehicle or vessel, for example), the increase in material density due to "shrinkage" of the material in the vicinity of the impact region will greatly improve the impact resistance of the structure (compared to a single material of equivalent mass), reducing localized collapse of the structure caused by the collision or explosion. In addition, the negative Poisson ratio structure also has higher fracture toughness, shear strength, energy consumption capability and the like. When the negative Poisson ratio structure is applied to a large-curvature environment, saddle-type deformation can not be generated like the traditional honeycomb structure. Therefore, with the continuous development of material preparation processes and 3D printing technologies, research and application of negative poisson ratio materials in the fields of geotechnical protection structures, vehicle armors, explosion-proof blankets, intelligent wearing and the like have been developed greatly.
When a negative poisson's ratio structure is applied as the energy absorbing layer of an impact protector, it tends to appear as a sandwich plate type structure due to its relatively low stiffness. However, when the impact load is large enough, it can lead to premature failure of the "rigid" skin and loss of its functionality, while an excessively thick skin goes against the structural optimization concept of "light energy absorption".
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the anti-collision device combining the chiral negative Poisson's ratio structure and the honeycomb structure, the chiral negative Poisson's ratio structure and the honeycomb structure are organically combined, and the anti-collision device has the advantages of light weight, good energy absorption, capability of resisting continuous impact and easiness in repairing.
The anti-collision device combining the chiral negative Poisson ratio structure and the honeycomb structure comprises the anti-collision device, wherein the anti-collision device is provided with a rigid inner cushion layer, a chiral negative Poisson ratio layer, a rigid middle cushion layer, a honeycomb layer and a rigid skin from inside to outside, the chiral negative Poisson ratio layer is of the chiral negative Poisson ratio structure arranged along the in-plane direction, the honeycomb layer is of the honeycomb structure arranged along the out-of-plane direction, and the rigid inner cushion layer, the rigid middle cushion layer and the rigid skin are fixedly connected with adjacent layers.
Preferably, the chiral negative poisson's ratio layer is composed of a ring-shaped node and six groups of ribs tangent to the node, the radius of all the nodes is equal, and the length of all the ribs is equal.
Preferably, the honeycomb layer adopts an assembly type structure, wherein a wedge-shaped groove is reserved on the rigid middle cushion layer, the honeycomb layer of the wedge-shaped structure is placed in the wedge-shaped groove, and the honeycomb layers in the adjacent wedge-shaped grooves are tightly connected to form a circular ring structure.
Preferably, when light collision occurs, the chiral negative poisson ratio layer with slightly low strength plays a role first, the rib generates plastic buckling deformation failure first, and then the deformation failure of the node further occurs; when a severe collision event occurs, collision energy is absorbed by the honeycomb layer, the failure mode of the chiral negative Poisson ratio layer is plastic deformation of the ribs and the nodes at the same time, and the chiral negative Poisson ratio layer has the characteristic of lower stress peak value which plays a role in protecting the anti-collision device under the action of impact force.
Preferably, the rigid skin is made into a ring node shape, a concave shape or a conical shape.
Preferably, the negative poisson's ratio layer and the honeycomb layer are both light porous structures, float on the sea surface and freely adjust the anti-collision height along with the water level.
Preferably, the chiral negative poisson's ratio layer and the honeycomb layer select different base materials, relative density values, geometric or material gradients and volume percentages of the whole anti-collision device according to actual conditions, and control the failure mode and anti-collision parameters of the whole anti-collision device.
Preferably, the inner pores of the chiral negative poisson ratio layer and the honeycomb layer are filled with soft materials for improving the energy absorption and impact resistance of the layers.
Preferably, when the rigid skin is used as an ocean engineering anti-collision device, the outer surface of the rigid skin is sprayed with an anticorrosive material.
The use process of the invention is as follows: the chiral negative poisson's ratio layer arranged along the in-plane direction is relatively weak: (1) when the collision energy is smaller, the chiral negative Poisson ratio layer of the inner layer firstly deforms to absorb a part of energy, and the rib firstly bends and fails to generate the negative Poisson ratio effect; (2) when the collision energy continues to increase, the anti-collision device aims to simultaneously sacrifice the outer honeycomb layer and the inner chiral negative poisson ratio layer to absorb the collision energy, and at the moment, the chiral negative poisson ratio layer generates relatively small peak stress relative to the honeycomb layer to play a role in protecting a protected structure.
The invention has the beneficial effects that:
(1) the characteristics of light energy absorption of the porous material and good collision resistance performance of the negative Poisson ratio structure are fully exerted, compared with the traditional anti-collision device, the anti-collision device has the advantages of light weight, good energy absorption, capability of resisting continuous impact and easiness in repair, the floatability of the anti-collision device with the ocean structure is realized, and the anti-collision height can be freely adjusted along with the water level;
(2) the appearance of the cone-shaped rigid skin can also be used for an anti-icing device of an ocean engineering structure;
(3) when collision occurs, the intervention time of the chiral negative poisson ratio layer and the honeycomb layer changes along with the change of the size of collision energy, so that the reusability of the anti-collision device is realized;
(4) the chiral negative poisson ratio structure with the low stress peak value is used as a protective material of the innermost layer, and the purpose of further protecting the safety of the building structure when severe collision occurs is achieved;
(5) the honeycomb structure is convenient to install and replace in a modular assembly mode.
Drawings
FIG. 1 is a schematic diagram of the present invention.
FIG. 2 is a second schematic structural diagram of the present invention.
FIG. 3 is a schematic structural diagram of a chiral negative Poisson's ratio layer.
FIG. 4 is a unit diagram of a chiral negative Poisson's ratio layer.
Fig. 5 is a schematic view of an assembled honeycomb structure.
In the figure: 1. a rigid inner cushion layer; 2. a chiral negative poisson's ratio layer; 21. a node; 22. a rib; 3. a rigid middle cushion layer; 4. a honeycomb layer; 5. a rigid skin.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the anti-collision device combining the chiral negative Poisson's ratio structure and the honeycomb structure is a multilayer composite structure and is mainly used for protecting key parts of engineering structures, such as ice resistance and ship impact resistance of ocean platform structures, ship and vehicle collision resistance of piers, highway guardrails and the like, and has better effects in the fields of common geotechnical protection structures, vehicle armors, explosion-proof blankets, intelligent wearing and the like.
As shown in fig. 1, the anti-collision device combining the chiral negative poisson's ratio structure and the honeycomb structure is arranged on the outer surface of a protected key structure, and sequentially comprises five layers from inside to outside, wherein the five layers are respectively: the composite material comprises a rigid inner cushion layer 1, a chiral negative Poisson's ratio layer 2, a rigid middle cushion layer 3, a honeycomb layer 4 and a rigid skin 5. The rigid inner cushion layer 1 and the rigid middle cushion layer 3 are connected with other layers through adhesives, and mainly play a role in excessive connection; the rigid skin 5, by spraying an anticorrosive material on the outer surface, mainly plays a role in slowing down or preventing corrosion.
In the invention, the collision protection function is as follows: the chiral negative Poisson's ratio layer 2 and the honeycomb layer 4 play a role in absorbing energy.
The chiral negative poisson's ratio layer 2 is a multi-layer porous structure as shown in fig. 3. The chiral negative poisson's ratio layer 2 arranged in the in-plane direction is relatively weak: when light collision occurs, the chiral negative Poisson ratio layer 2 with slightly lower strength plays a role firstly, the rib 22 generates plastic buckling deformation failure, and then further generates deformation failure of the node 21; when a severe collision event occurs, collision energy is absorbed by the honeycomb layer 4, the failure mode of the chiral negative poisson ratio layer 2 is plastic deformation of the ribs 22 and the nodes 21 at the same time, and the chiral negative poisson ratio layer 2 has a lower stress peak value under the action of strong impact force to play a role in protecting a collided structure.
When collision happens, the intervention time of the energy absorption layer of the negative Poisson ratio structure and the honeycomb structure layer changes along with the change of the size of collision energy, and the reusability of the anti-collision device is realized.
As shown in figure 4, the chiral negative Poisson ratio layer 2 consists of a ring-shaped node 21 and six groups of ribs 22 tangent to the node 21, the radii of all the nodes 21 are equal, and the lengths of all the ribs 22 are equal.
The chiral negative poisson's ratio layer 2 in fig. 3 is formed by the unit structure of fig. 4 sequentially expanding around. In the cell structure of fig. 4, when subjected to external pressure, the ribs 22 wind around the nodes 21, causing a negative poisson effect in the structure.
The honeycomb layer 4 is a multi-layer porous structure as shown in fig. 1 and 2. The honeycomb layer 4 arranged in the out-of-plane direction is relatively stiff: when a large collision energy is generated, the energy is absorbed by utilizing the plastic deformation of the energy absorbing material.
Example 2:
as shown in fig. 5, the honeycomb layer 4 has a fabricated structure. The honeycomb structure is arranged in its out-of-plane direction to resist external collision loads, and is bonded to the rigid middle cushion layer 3 and the outermost rigid skin 5 by an adhesive. In order to avoid saddle effect under the large-curvature forming and realize the aim of easy installation and replacement, the assembly is carried out in a modularized mode. A wedge-shaped groove is reserved on the rigid middle cushion layer 3 in advance, and then a honeycomb layer 4 with a wedge-shaped structure is placed. The honeycomb layers 4 in adjacent wedge-shaped grooves are closely connected to form a ring-shaped structure.
It should be noted that: if only the negative poisson ratio layer is used as the energy absorption layer of the impact protection device, the rigidity is relatively low, the impact load is large enough, the 'rigid' skin can fail early to lose the functionality, and the excessively thick skin breaks away from the structural optimization concept of 'light energy absorption'. To balance the "stiffness" and thickness of the skin, a honeycomb layer 4 is added between the negative poisson's ratio layer and the rigid skin 5. The honeycomb layer 4 can not reduce the rigidity of the skin, and can not violate the structural optimization concept of 'light energy absorption' of the negative Poisson ratio layer, thereby realizing unexpected effects.
It should be noted that: because negative poisson's ratio layer and honeycomb layer 4 all are light porous structure, it is placed in the sea water, can realize buffer stop's floatability, can freely adjust crashproof height along with the water level.
Example 3:
the anti-collision device combining the chiral negative Poisson's ratio structure and the honeycomb structure has various structures.
The anti-collision device can be made into a ring shape, a concave shape or even a cone shape. The anti-collision device is manufactured into a ring shape and can be used for preventing collision between a pier, an ocean platform and a ship and collision between a building upright column beside a road and a vehicle. An annular bump guard is also the most common configuration, as shown in fig. 1. The anti-collision device is manufactured into a concave shape or a conical shape, as shown in fig. 2, the anti-collision device mainly means that the outermost rigid skin 5 can be manufactured into a concave shape or a conical shape and can be used for ice resistance of an ocean engineering structure and prevention of upward and downward sliding of the anti-collision device in collision.
Example 4:
the parameters of the chiral negative poisson ratio layer 2 and the honeycomb layer 4 are selected according to actual conditions.
The chiral negative poisson's ratio layer 2 and the honeycomb layer 4 can select different base materials, relative density values, geometric or material gradients and volume percentages of the whole anti-collision device according to actual conditions so as to control the failure mode and anti-collision parameters of the whole anti-collision device. The characteristics of light energy absorption of the porous material and good collision resistance performance of the negative Poisson ratio structure are fully exerted, and compared with the traditional anti-collision device, the anti-collision device has the advantages of light weight, good energy absorption, capability of resisting continuous impact and easiness in repairing. In addition, the outermost rigid skin 5 can also be made of composite materials, and anticorrosive materials can be sprayed on the outer surface of the rigid skin used in a high-corrosivity environment.
In addition, in order to improve the strength and the energy absorption capacity, the inner pores of the chiral negative poisson's ratio layer 2 and the honeycomb layer 4 can be filled with soft materials with energy absorption and impact resistance, such as polyurethane foam.
The invention can be widely applied to the occasions of impact protection devices, in particular to the field of safety protection of land and ocean building structures.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a collision avoidance device who unites negative poisson's ratio structure of hand and honeycomb, including collision avoidance device, a serial communication port, collision avoidance device is provided with rigidity inner cushion (1) from inside to outside, chirality negative poisson's ratio layer (2), bed course (3) in the rigidity, honeycomb layer (4) and rigidity covering (5), chirality negative poisson's ratio layer (2) are the chirality negative poisson's ratio structure of arranging along the in-plane direction, honeycomb layer (4) are the honeycomb structure of arranging along the out-of-plane direction, rigidity inner cushion (1), bed course (3) and rigidity covering (5) all with adjacent layer fixed connection in the rigidity.
2. The crash barrier with a combination of a chiral negative poisson's ratio structure and a honeycomb structure as claimed in claim 1, characterized in that said chiral negative poisson's ratio layer (2) is composed of a ring-shaped node (21) and six sets of ribs (22) tangent thereto, all the nodes (21) have the same radius, and all the ribs (22) have the same length.
3. The anti-collision device combining the chiral negative Poisson's ratio structure and the honeycomb structure as claimed in claim 1, wherein the honeycomb layer (4) adopts an assembled structure, wherein a wedge-shaped groove is reserved on the rigid middle cushion layer (3), the honeycomb layer (4) with the wedge-shaped structure is placed into the wedge-shaped groove, and the honeycomb layers (4) in the adjacent wedge-shaped grooves are closely connected to form a circular ring structure.
4. The crash barrier combining a chiral negative poisson's ratio structure and a honeycomb structure as claimed in claim 3, wherein when a light collision occurs, the chiral negative poisson's ratio layer (2) with slightly lower strength acts first, the ribs (22) fail in plastic buckling deformation, and then the nodes (21) fail in deformation; when a severe collision event occurs, collision energy is absorbed by the honeycomb layer (4) and the chiral negative Poisson ratio layer (2) together, the failure mode of the chiral negative Poisson ratio layer (2) is the plastic deformation of the ribs (22) and the nodes (21) at the same time, and the chiral negative Poisson ratio layer (2) has the characteristic of lower stress peak value under the action of impact force, so that the anti-collision device is further protected.
5. The crash barrier combining a chiral negative poisson's ratio structure and a honeycomb structure as claimed in claim 1, characterised in that said rigid skin (5) is made in the shape of a ring node, a concave or a cone.
6. The anti-collision device combining the chiral negative poisson's ratio structure and the honeycomb structure as claimed in claim 1, wherein the negative poisson's ratio layer and the honeycomb layer (4) are both light porous structures, float on the sea surface and freely adjust the anti-collision height along with the water level.
7. The crash barrier with a combination of a chiral negative poisson's ratio structure and a honeycomb structure as claimed in claim 1, wherein said chiral negative poisson's ratio layer (2) and said honeycomb layer (4) are selected according to actual conditions, such as different base materials, relative density values, geometric or material gradients, and volume percentage of the whole crash barrier, so as to control the failure mode and crash barrier parameters of the whole crash barrier.
8. The crash barrier with a combination of a chiral negative poisson's ratio structure and a honeycomb structure as claimed in claim 7, characterized in that the inner pores of the chiral negative poisson's ratio layer (2) and the honeycomb layer (4) are filled with soft materials for improving the energy absorption and impact resistance of the layers.
9. The crash barrier with a combination of a chiral negative poisson's ratio structure and a honeycomb structure as claimed in claim 1, characterised in that the outer surface of the rigid skin (5) is sprayable with an anti-corrosive material for highly corrosive environments.
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| CN201911308941.0A CN110984417B (en) | 2019-12-18 | 2019-12-18 | Anti-collision device combining chiral negative Poisson ratio structure and honeycomb structure |
| PCT/CN2020/097447 WO2021120567A1 (en) | 2019-12-18 | 2020-06-22 | Anti-collision device combining chiral structure having negative poisson's ratio with honeycomb structure |
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| CN201911308941.0A CN110984417B (en) | 2019-12-18 | 2019-12-18 | Anti-collision device combining chiral negative Poisson ratio structure and honeycomb structure |
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| CN111549814A (en) * | 2020-04-16 | 2020-08-18 | 重庆大学 | Wave-dissipating porous anti-collision device for offshore wind power tower foundation |
| CN112227187A (en) * | 2020-09-30 | 2021-01-15 | 北京工业大学 | Pier buffer stop is filled to negative poisson's ratio honeycomb of layering gradient |
| CN112253681A (en) * | 2020-09-22 | 2021-01-22 | 江苏科技大学 | Tension-compression type energy-absorbing buffering device |
| CN112623137A (en) * | 2020-12-14 | 2021-04-09 | 武汉理工大学 | Shipboard impact-resistant protection structure based on negative Poisson ratio effect and application thereof |
| CN112709373A (en) * | 2020-12-29 | 2021-04-27 | 青岛建设集团有限公司 | Assembled shape memory alloy energy-consumption combined column and installation method |
| WO2021120567A1 (en) * | 2019-12-18 | 2021-06-24 | 青岛理工大学 | Anti-collision device combining chiral structure having negative poisson's ratio with honeycomb structure |
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| CN114808670A (en) * | 2022-05-25 | 2022-07-29 | 江苏科技大学 | Pier anti-collision device with self-adaptive adjustment of relative height position |
| CN114941344A (en) * | 2022-06-29 | 2022-08-26 | 江苏科技大学 | Multiple buffering formula offshore wind power single pile basis buffer stop |
| CN115323960A (en) * | 2022-07-11 | 2022-11-11 | 泉州装备制造研究所 | Urban traffic protective guard |
| CN115419040A (en) * | 2022-10-14 | 2022-12-02 | 哈尔滨工业大学（威海） | Self-floating offshore photovoltaic pile foundation anti-collision device and application method thereof |
| CN115584120A (en) * | 2022-10-14 | 2023-01-10 | 北京化工大学 | Preparation method of polyurethane elastomer composite material with negative Poisson ratio property |
| CN115584120B (en) * | 2022-10-14 | 2024-03-01 | 北京化工大学 | Preparation method of polyurethane elastomer composite material with negative poisson ratio property |
| CN116168784A (en) * | 2023-02-28 | 2023-05-26 | 哈尔滨工业大学 | Negative poisson ratio structural design method for self-similar hierarchical assembly |
| CN116168784B (en) * | 2023-02-28 | 2023-08-29 | 哈尔滨工业大学 | Negative poisson ratio structural design method for self-similar hierarchical assembly |
| CN116721722A (en) * | 2023-06-19 | 2023-09-08 | 盛年科技有限公司 | Mechanical property database and numerical calculation method based on chiral lattice structure |
| CN116721722B (en) * | 2023-06-19 | 2023-12-19 | 盛年科技有限公司 | Mechanical property database and numerical calculation method based on chiral lattice structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110984417B (en) | 2021-06-15 |
| WO2021120567A1 (en) | 2021-06-24 |
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