CN115973079A

CN115973079A - Novel biological enlightening DNA lattice structure lateral energy absorption device and application

Info

Publication number: CN115973079A
Application number: CN202211109951.3A
Authority: CN
Inventors: 可文; 席晨馨; 张力文; 郑冬黎
Original assignee: Hubei University of Automotive Technology
Current assignee: Hubei University of Automotive Technology
Priority date: 2022-09-13
Filing date: 2022-09-13
Publication date: 2023-04-18

Abstract

The invention belongs to the technical field of energy absorption devices, and discloses a novel lateral energy absorption device with a biological inspired DNA lattice structure and application thereof, wherein the lateral energy absorption device comprises an upper flat plate, a lower flat plate and a middle layer positioned between the upper flat plate and the lower flat plate; the upper flat plate and the lower flat plate are both of deformable shell-type plate structures; the middle layer DNA lattice comprises a plurality of bionic DNAs which are respectively arranged along the x direction and the z direction of the flat plate to form a 3 x 12 matrix lattice structure. Since the DNA lattice can absorb a large amount of energy during forced deformation, the large peak forces generated at impact are gradually broken down by the DNA lattice during deformation compression and significantly increase the specific energy absorption of the structure. No. 45 steel materials adopted by the upper panel and the lower panel have higher yield strength, so that the upper panel and the lower panel cannot crack in the compression process.

Description

Novel biological inspired DNA lattice structure lateral energy absorption device and application

Technical Field

The invention belongs to the technical field of energy absorption devices, and particularly relates to a novel lateral energy absorption device with a biological enlightenment DNA lattice structure and application thereof.

Background

At present, the development of a lattice structure is relatively rapid, various different structures are often used as filling lattices due to the advantages of small density, good buffering and energy absorption and the like of the lattice structure, and a large amount of energy generated is absorbed through the compression deformation of the lattice structure, so that the safety of passengers and articles can be better.

Different materials and structures are selected to manufacture the energy absorption device, and the energy absorption capacity after collision is different due to the difference of the materials and the structures. With the development of global science and technology and the emergence of various novel technologies, various novel vehicles appear, so that the occurrence frequency of traffic accidents is increased, and great pain is brought to each family. Therefore, the energy absorption capacity of the energy absorption device is improved, the energy generated in collision is gradually counteracted through the plastic deformation of crystal lattices, and the initial peak force generated in collision is reduced, so that the damage to people caused by the energy generated in collision can be better reduced.

Through the combing discovery of a large amount of literature data, the problems and the defects of the prior art are as follows: most of the existing collision energy absorption devices are metal thin-wall tube structures, the collision resistance and the energy absorption characteristics of the structures are poor, and a large amount of impact energy generated during collision is difficult to absorb. However, no energy absorption device which selects DNA as a lattice filling structure exists at present, so that the invention provides a novel lateral energy absorption device of a biological inspired DNA lattice structure.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a novel lateral energy absorption device with a biological inspired DNA lattice structure and application thereof.

The invention is thus achieved, a novel bio-inspired DNA lattice structure lateral energy absorbing device comprising:

the upper flat plate, the lower flat plate and the middle layer positioned between the upper flat plate and the lower flat plate;

the upper flat plate and the lower flat plate are both of deformable shell-type plate structures;

the middle layer DNA lattice comprises a plurality of bionic DNAs which are respectively arranged along the x direction and the z direction of the flat plate to form a 3 x 12 matrix lattice structure.

Further, the intermediate layer fills the DNA lattice with the same or different cross-sectional dimensions, base pair diameters, and distances between the two duplexes.

Further, the cross section of the bionic DNA is oval or round.

Further, the intermediate DNA lattice has the same spacing in the x-direction and z-direction of the plate, respectively, which is no more than one-half of the distance between the two double helices of DNA.

Further, the upper flat plate and the lower flat plate are the same in size and thickness and are both in a thin plate structure, and the size of the upper flat plate and the size of the lower flat plate are larger than the size of the middle filling DNA matrix.

Furthermore, the upper flat plate and the lower flat plate are both made of high-strength steel materials, and the middle filling DNA layer is made of high-crystallinity polymer materials such as polyurethane foam, isocyanate resin or polyol.

Further, the upper flat plate and the lower flat plate are processed by adopting a cold rolling process.

Furthermore, a plurality of bionic DNAs in the middle layer are respectively placed in parallel along the x direction and the z direction of the flat plate, and the DNA sandwich is connected with the top expansion metal plate and the bottom expansion metal plate in an adhesion mode so as to ensure the coordination of the buffer energy absorption device in lateral energy absorption.

In combination with the technical solutions and the technical problems to be solved, please analyze the advantages and positive effects of the technical solutions to be protected in the present invention from the following aspects:

first, aiming at the technical problems and difficulties in solving the problems in the prior art, the technical problems to be solved by the technical scheme of the present invention are closely combined with results, data and the like in the research and development process, and some creative technical effects are brought after the problems are solved. The specific description is as follows:

since the DNA lattice can absorb a large amount of energy during forced deformation, the large peak forces generated at impact are gradually decomposed by the DNA lattice during deformation compression and significantly increase the specific energy absorption of the structure. No. 45 steel materials adopted by the upper panel and the lower panel have higher yield strength, so that the upper panel and the lower panel cannot crack in the compression process.

The energy absorption device combines the bionics knowledge, selects DNA as filling crystal lattices, and can reduce the initial peak force generated in collision, thereby improving the collision resistance of vehicles, spacecrafts and the like and better protecting the safety of passengers and articles. Moreover, the high-polymerization material is selected as the filling material, has high energy absorption capacity, and can be widely applied to many engineering protection fields of automobiles, buildings, aerospace and the like.

Secondly, considering the technical solution as a whole or from the perspective of products, the technical effects and advantages of the technical solution to be protected by the present invention are specifically described as follows:

the invention provides a novel bionic DNA lattice structure energy absorption device with high specific energy absorption and low initial peak force. When collision happens, impact energy can be dissipated through plastic deformation of the DNA crystal lattices, and initial peak force generated during collision is reduced, so that harm to people caused by collision is reduced, and safety of passengers and articles is protected better.

The invention combines bionics, selects DNA as filling crystal lattice, provides a bionic DNA crystal lattice energy absorption device, and fills the gap of energy absorption structures at home and abroad.

Third, as an inventive supplementary proof of the claims of the present invention, there are also presented several important aspects:

(1) The expected income and commercial value after the technical scheme of the invention is converted are as follows:

the bionic DNA lattice structure energy absorption device can absorb a large amount of energy in the stress deformation process, can better protect the safety of personnel when collision accidents happen, and can be applied to various environments, such as: the anti-collision performance of vehicles and the like is improved, the safety protection of highways, various auxiliary protection devices (such as motorcycle helmets, safety helmets and bulletproof vests), the package and transportation of fragile articles and the like are realized.

(2) The technical scheme of the invention fills the technical blank in the industry at home and abroad:

the energy absorption device combines bionics knowledge, selects DNA as filling crystal lattices, and provides a novel bionic DNA collision energy absorption structure.

Drawings

FIG. 1 is a schematic structural diagram of a novel lateral energy-absorbing device of a bio-inspired DNA lattice structure provided by an embodiment of the present invention;

FIG. 2 is a front view of a bionic DNA lattice energy absorption device provided by an embodiment of the invention;

FIG. 3 is a right side view of a bionic DNA lattice energy absorption device provided by an embodiment of the invention;

FIG. 4 is a diagram showing the arrangement of an intermediate DNA sandwich layer according to an embodiment of the present invention;

(a) Is a layer arrangement diagram; (b) is a schematic diagram of a two-layer arrangement; (c) is a schematic diagram of a three-layer arrangement;

FIG. 5 is a structural deformation diagram of the bionic DNA lattice impact-resistant energy absorption device provided by the embodiment of the invention when bearing impact load;

FIG. 6 is a specific energy absorption-displacement curve of the bionic DNA lattice impact-resistant energy absorption device provided by the embodiment of the invention when bearing impact load;

FIG. 7 is a load-displacement curve of the bionic DNA lattice impact-resistant energy absorption device provided by the embodiment of the invention when bearing impact load.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.

As shown in fig. 1, the novel lateral energy absorption device of bio-inspiring DNA lattice structure provided by the embodiment of the present invention is a combined structure of a plurality of DNAs equidistantly and parallelly distributed made of rigid foam and metal steel material, which comprises, from top to bottom: an upper plate 1, a lower plate 2, and a DNA sandwich layer 3 between the upper plate and the lower plate. Wherein the upper flat plate and the lower flat plate are both of deformable shell plate structures; and a plurality of bionic DNAs in the middle layer are arranged along the x direction and the z direction respectively to form a 3X 12 matrix structure. The middle filling DNA structure is connected with the upper flat plate and the lower flat plate in a bonding mode, so that the bionic DNA lattice structure can timely replace DNA which is subjected to plastic deformation due to energy absorption after being impacted by collision, and the DNA which is not subjected to plastic deformation can be continuously used as an energy absorption structure.

The DNA distribution of the bionic DNA lattice structure energy absorption device is shown in attached figures 2 and 3, the cross section of the DNA is oval, the long axis of the oval cross section is 8mm, the short axis length is 4mm, the distance between two double spirals is 27mm, the base pair diameter is 3mm, the DNA is respectively arranged along the x direction and the z direction of a flat plate at equal intervals, and the distance between adjacent DNA is 40mm. The lattice structure of the filling DNA in the invention is not limited to three-layer arrangement, and can be replaced by other arrangement modes listed in the attached figure 4, and the arrangement layer number of the DNA is determined according to the application scene of the energy-absorbing device.

The novel bio-inspired DNA lattice structure energy absorption device provided by the invention is mainly applied to the positions of an anti-collision beam of a side door of an automobile or a front beam of a bumper and the like, when the device collides with the ground or other vehicles, the device is firstly contacted with the upper panel, the upper panel firstly generates elastic deformation and simultaneously generates a larger initial peak force to press the bionic DNA lattice downwards, the acceleration is reduced, and the middle layer DNA generates elastic and plastic deformation of a structure. When the filling DNA lattice can not meet the energy absorption requirement, the energy absorption characteristic of the bionic DNA lattice structure can be improved by reducing the section size of the DNA, the distance between two double spirals or the diameter of a base pair.

The bionic DNA lattice energy structure can be used for improving the collision resistance of upper and lower beams, roof edges, bumpers and the like of vehicles, the safety protection of highways, various auxiliary protection devices such as motorcycle helmets and the like, the packaging and the transportation of fragile articles and the like.

The energy absorption characteristic of the bionic DNA lattice structure energy absorption device is introduced according to a low-speed impact three-point bending experiment of the structure, the collision speed of a pressure head and the energy absorption device in the three-point bending experiment is 2m/s, the deformation mode of a DNA lattice in the collision experiment is shown in figure 5, the damage form of the bionic DNA lattice structure under the collision impact load is mainly pressed in and yielded, and as the upper panel is made of steel materials and has high yield strength, cracks can not appear at the stress position of the upper panel in the compression process, but the DNA can generate obvious plastic deformation after the compression is finished. The novel bio-inspired DNA lattice structure energy absorption device is proved to have good energy absorption effect by absorbing a large amount of energy generated by collision through the compression deformation of the DNA lattice structure, the corresponding specific energy absorption-displacement curve is shown as an attached drawing 6, the load-displacement curve is shown as an attached drawing 7, and the DNA lattice has higher specific energy absorption under the action of low-speed impact load.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The above description is only for the purpose of illustrating the embodiments of the present invention, and the scope of the present invention should not be limited thereto, and any modifications, equivalents and improvements made by those skilled in the art within the technical scope of the present invention as disclosed in the present invention should be covered by the scope of the present invention.

Claims

1. A novel bio-inspired DNA lattice structure lateral energy absorbing device, comprising:

the upper layer flat plate, the lower layer flat plate and the middle layer positioned between the upper layer flat plate and the lower layer flat plate;

2. The novel bio-inspired DNA lattice structure lateral energy absorbing device of claim 1, in which the intermediate layer fills the same or different cross sectional dimensions, base pair diameters and distances between the two double helices of the DNA lattice.

3. The novel bio-inspired DNA lattice structure lateral energy absorbing device of claim 1, wherein the cross-section of the biomimetic DNA is elliptical or circular.

4. The novel bio-inspired DNA lattice structure lateral energy absorbing device of claim 1, wherein the intermediate DNA lattice has the same pitch in the plate x-direction and z-direction, respectively, that is no more than one-half the distance between two DNA duplexes.

5. The novel bio-inspired DNA lattice structure lateral energy absorbing device of claim 1, wherein the upper and lower plates are the same size and thickness, both in thin plate configuration, and the size of the upper and lower plates is larger than the size of the middle packed DNA matrix.

6. The novel bio-inspired DNA lattice structure lateral energy absorbing device of claim 1, wherein the upper and lower plates are made of high strength steel and the middle layer is filled with DNA made of highly crystalline polymeric material such as polyurethane foam, isocyanate resin or polyol.

7. The device as claimed in claim 1, wherein the upper and lower plates are processed by cold rolling process.

8. The device as claimed in claim 1, wherein the bionic DNAs are juxtaposed in the x-direction and z-direction of the plate, and the sandwich DNA is bonded to the top and bottom expanded metal plates.

9. An automobile side door anti-collision beam, characterized in that the automobile side door anti-collision beam is provided with a novel bio-inspired DNA lattice structure lateral energy absorption device as claimed in any one of claims 1 to 8.

10. An automobile bumper front beam characterized in that it is equipped with a novel bio-inspired DNA lattice structure lateral energy absorbing device as claimed in any one of claims 1 to 8.