CN114941673B - Composite negative poisson ratio structure for buffering and absorbing energy - Google Patents
Composite negative poisson ratio structure for buffering and absorbing energy Download PDFInfo
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- CN114941673B CN114941673B CN202111491086.9A CN202111491086A CN114941673B CN 114941673 B CN114941673 B CN 114941673B CN 202111491086 A CN202111491086 A CN 202111491086A CN 114941673 B CN114941673 B CN 114941673B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
- F16F7/128—Vibration-dampers; Shock-absorbers using plastic deformation of members characterised by the members, e.g. a flat strap, yielding through stretching, pulling apart
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The application discloses a composite negative poisson ratio structure for buffering and absorbing energy, which comprises a concave star-shaped structure, wherein the concave star-shaped structure is a hollow structure with a plurality of concave corner points, a thin-wall round structure serving as internal constraint is arranged in the hollow structure, the thin-wall round structure is coupled with the concave corner points, the concave star-shaped structure forms a two-dimensional composite negative poisson ratio structure through geometric mirror images and a periodic array, and the concave star-shaped structures are connected through a beam-shaped structure.
Description
Technical Field
The application relates to the technical field of negative poisson ratio structures, in particular to a composite negative poisson ratio structure for buffering and absorbing energy.
Background
Poisson's ratio is an inherent property of a material, and refers to the negative value of the ratio of the strain in the vertical load direction to the strain in the load direction of the material when the material is loaded, and is a mechanical parameter for measuring the deformation property of the material. Most materials in nature exhibit positive poisson's ratio, i.e. contract in the direction of vertical loading when in tension and expand in the direction of vertical loading when in compression. The negative poisson ratio mechanical metamaterial is used as a structural material designed manually, and the structural whole body can show an unconventional negative poisson ratio effect, namely the deformation characteristics of tension expansion and compression contraction, namely the auxetic effect, so that the structural material has excellent mechanical properties of light weight, high specific energy absorption, high specific strength and the like, and has great application potential in the aspects of buffering energy absorption and structural impact protection.
In the existing negative poisson ratio materials or structures, most stress-strain curves of the materials or structures are only in one stage when being pressed, the deformation modes of the materials or structures are single, and the materials or structures have larger randomness and instability, so that the stress fluctuation of the platforms is larger, the integral energy absorption effect of the structures is poor, and the initial stress peak value is generally larger than the stress value of the platforms, so that the buffering protection of the structures is extremely unfavorable.
The above information disclosed in the background section is only for enhancement of understanding of the background of the application and therefore may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The application aims to provide a composite negative poisson ratio structure for buffering and energy absorption, which further improves the mechanical property and buffering and energy absorption capacity of the negative poisson ratio structure, has multi-step deformation and a plurality of energy absorption platforms, and has various deformation modes and higher energy absorption in the deformation process compared with other structures.
In order to achieve the above object, the present application provides the following technical solutions:
the composite negative poisson's ratio structure for buffering and absorbing energy of the present application includes,
the concave star-shaped structure is a hollow structure with a plurality of concave corner points, a thin-wall round structure serving as internal constraint is arranged in the hollow structure, the thin-wall round structure is connected with the concave corner points in a coupling mode, the concave star-shaped structure forms a two-dimensional composite negative Poisson ratio structure through geometric mirror images and periodic arrays, and the concave star-shaped structures are connected through a beam-shaped structure.
In the composite negative poisson ratio structure for buffering and absorbing energy, the beam-shaped structure is a thin-wall beam.
In the composite negative poisson ratio structure for buffering and absorbing energy, the strength of the beam-shaped structure is smaller than that of the concave star-shaped structure.
In the composite negative poisson ratio structure for buffering and absorbing energy, the thin-wall round structure is coupled with all the concave angle points.
In the composite negative poisson ratio structure for buffering and absorbing energy, the composite negative poisson ratio structure shows three stress platforms and three deformation steps under the action of compression load. It can be appreciated that the composite structure has obvious negative poisson ratio characteristics, motion coupling exists between the thin-wall round structure and the star-shaped hollow structure, a lateral compression mode of the thin-wall round is introduced, and the structure has three energy-absorbing stress platforms under quasi-static compression, and an orderly three-step deformation mode is shown.
In the composite negative poisson ratio structure for buffering and absorbing energy, the concave star-shaped structure is a central symmetry structure.
In the composite negative poisson ratio structure for buffering and absorbing energy, the cell wall length l of the hollow structure is equal, and the cell wall thickness t follows the cell wall slender ratio t/l <1/10.
In the composite negative poisson ratio structure for buffering and absorbing energy, the concave angle alpha is 55 degrees < alpha <75 degrees, and the included angle phi between the concave star structures is 0 degrees < phi <90 degrees.
In the composite negative poisson ratio structure for buffering and absorbing energy, the concave star-shaped structure is a hollow structure with four concave corner points and is centrosymmetric, the concave star-shaped structure is arranged in a mirror image mode along a y axis, the mirror image structure is arranged in a mirror image mode along an x axis again to form a representative volume unit, and the representative volume unit is periodically arrayed along the x axis and the y axis to form a two-dimensional periodic structure.
In the composite negative poisson ratio structure for buffering and absorbing energy, the material of the concave star structure is aluminum alloy, stainless steel, titanium alloy, nylon or resin.
In the technical scheme, the composite negative poisson ratio structure for buffering and absorbing energy has the following beneficial effects: the composite negative poisson ratio structure for buffering and absorbing energy has three orderly and stable deformation steps when bearing compressive load, diversified deformation modes, and unique three platform stress stages except an elastic stage and a compact stage on a corresponding stress strain curve, and the deformation characteristic solves the limitations of random instability, single deformation mode and only one stress platform of the current structure. The first platform stress is generated by bending deformation of beam-shaped connection bearing bending moment; for the second platform stress, under the action of compressive load, the horizontal node of the star-shaped structure performs opposite shrinkage motion to drive the vertical translation of the vertical node, so that the rotation and bending of the cell wall of the star-shaped structure and the deformation of the thin-wall circular structure are caused, and the second platform stress is generated; in the third deformation step, the third stress plateau is mainly caused by further deformation of the thin-walled circular structure and bending and rotation of the inclined walls of the star-shaped structure. The deformation mechanism of each platform stage is different, and through reasonable design of the whole structure and reasonable interaction among cells, independent improved design can be carried out on the deformation step and the platform stress of the structure, so that the platform stress and the energy absorption effect of the structure are further improved. Compared with the existing negative poisson ratio structure, the novel structure skillfully combines the rotation characteristic of the rotating structure and the negative poisson effect with the large deformation of the reentrant structure, converts the horizontal displacement load into the vertical displacement load through the common node connection, indirectly introduces the lateral compression of the cell wall circle, further improves the deformation capacity of the structure, dissipates more energy and shows better energy absorption effect. According to the application, proper geometric parameters of the structure are selected according to actual engineering index requirements so as to meet different application requirements.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a schematic structural diagram of a composite negative Poisson's ratio structure for buffering energy absorption;
FIG. 2 is a finite element simulation model schematic of an embodiment of a composite negative Poisson's ratio structure for buffering energy absorption;
FIG. 3 is a schematic representation of the deformation of a simulated structure under compressive load of one embodiment of a composite negative Poisson's ratio structure for cushioning energy absorption;
FIG. 4 is a schematic representation of the mechanical response of a simulated structure under compressive load of one embodiment of a composite negative Poisson's ratio structure for buffering energy absorption;
FIG. 5 is a schematic diagram of the geometry of the structure of one embodiment of a composite negative Poisson's ratio structure for cushioning energy absorption that affects its overall performance;
FIG. 6 is a schematic diagram of compressive strain versus specific energy absorption for one embodiment of a composite negative Poisson's ratio structure for buffering energy absorption;
FIG. 7 is a structural design concept and geometry layout with multiple stress plateau phases for one embodiment of a composite negative Poisson's ratio structure for buffering energy absorption.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described with reference to fig. 1 to 7 of the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, based on the embodiments of the application, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the application.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, based on the embodiments of the application, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In order to make the technical scheme of the present application better understood by those skilled in the art, the present application will be further described in detail with reference to the accompanying drawings.
In one embodiment, the composite negative poisson ratio structure for buffering and absorbing energy comprises a concave star-shaped structure 2, wherein the concave star-shaped structure is a hollow structure with a plurality of concave corner points 7, a thin-wall round structure 3 serving as internal constraint is arranged in the hollow structure, the thin-wall round structure 3 is coupled with the concave corner points 7, the concave star-shaped structure 2 forms a two-dimensional composite negative poisson ratio structure through geometric mirror images and periodic arrays, and the concave star-shaped structures 2 are connected through a beam-shaped structure 4. The application effectively improves the current situation that the deformation mode of the negative poisson ratio structure is single, so that the deformation process has the characteristics of stability, order and controllability, and meanwhile, the application further improves the ratio energy absorption of the negative poisson ratio structure, promotes the application of the negative poisson ratio structure in the field of buffering energy absorption, and provides reference for the design of novel structural materials. The application is suitable for the design of various buffering protection structures including the design of the energy absorption boxes of the automobile bumper and the anti-collision beam, and can realize buffering energy absorption under different load actions and reduce the damage of the load to the structure by reasonably selecting structural materials, dimensions and the like.
In one embodiment, as shown in fig. 1, based on the conventional structure of a rotating rigid square, a beam-shaped structure 4 with small thickness is used as a connection to replace the original ideal hinge connection, the rigid square is hollowed out to form a new star-shaped structure, a thin-wall circle is used as an internal constraint, the thin-wall circle is connected with four corner points of the star-shaped structure together, and the four corner points are geometrically mirrored and periodically arrayed to form a two-dimensional composite negative poisson ratio structure.
When the structure bears compressive load, the strength of the beam-shaped connection is much smaller than that of the star-shaped structure, and the structure is equivalent to a hinge capable of bearing and transmitting bending moment, so that the adjacent star-shaped structure can rotate around the beam-shaped connection in opposite directions, the whole structure is concavely contracted, and the structure has the characteristic of negative poisson ratio. Due to the self-contact of the beam-like structure 4 and the cell walls, a stable intermediate geometry is formed during the whole compression process, thereby representing three orderly and stable deformation steps, and three platform stress phases on the stress-strain curve, which improves the overall compressive strength of the structure, thereby improving the energy absorbing capacity.
It should be noted that the structure is formed by reasonably combining two negative poisson ratio structures, and meanwhile, a thin-wall round structure 3 with better pressure resistance and energy absorption effect is introduced, so that the overall mechanical property and energy absorption capability of the structure are further enhanced. The cell wall length l of the star-shaped structure is equal, the cell wall thickness t can be selected according to specific conditions, and the principle that the cell wall length ratio t/l is less than 1/10 is adopted. The concave angle alpha of the star-shaped structures is 55 degrees < alpha <75 degrees, and the included angle phi between the star-shaped structures is 0 degrees < phi <90 degrees. The length and thickness of the beam-like connection are not specifically specified, depending on the particular application requirements. The structure is fixed in width in the out-of-plane direction, and the specific value is based on the fact that the structure does not deform out-of-plane when bearing compressive load. In one embodiment of the application, the corresponding geometrical parameters are: l=20 mm, t=1 mm, l1=2 mm, t1=1 mm, α=60°, Φ=30°. The geometric parameters can be flexibly changed for specific application occasions and functional requirements.
In one embodiment, the composite negative poisson's ratio structure includes: the structure comprises a concave star-shaped structure 2, a beam-shaped connecting structure and a thin-wall circular structure 3 which are mutually at a certain angle, wherein the star-shaped structure is directly connected through a beam-shaped structure 4, the thin-wall circular structure 3 is used as internal constraint and is coupled and connected with four concave corners 7 of the star-shaped structure, the structure is formed by mirror-arranging the star-circular basic composite structure along the y axis, mirror-arranging the mirror-imaged structure along the x axis again to form a representative volume unit, and periodically array the representative volume unit along the x axis and the y axis to form a two-dimensional periodic structure. It should be noted that, in a preferred embodiment of the present application, a 2×2 periodic structure is adopted, so that on one hand, the special properties of the structure can be accurately represented, meanwhile, the calculation efficiency is improved, and the technician can perform appropriate changes on the periodic number of the structure according to the application occasion and the installation space of the actual structure, and the deformation characteristics thereof remain unchanged, so as to meet different requirements.
In one embodiment, fig. 1 shows a specific embodiment of the present application, the square outer frame 1 is shown in the form of a dotted line as a dimensional constraint of a star structure, and does not appear in actual preparation; under the size constraint of the square outer frame, the concave star-shaped structure 2 has a concave angle alpha=60 degrees, the cell wall length is l=20 mm, the thin-wall round structure 3 with the thickness t=1 mm is used as the internal constraint of the star-shaped structure, and is coupled with four corner points of the square outer frame to form a hollowed-out structure, and the size of the thin-wall round is determined by the star shape; after a series of mirror images and array operations are performed among the square outer frame 1, the concave star-shaped structure 2 and the thin-wall circular structure 3, a periodic structure is formed, and the structures are connected through the beam-shaped structure 4, wherein the length l1=2 mm and the thickness t1=1 mm of the beam-shaped structure 4. The present example selects a 2 x 2 periodic array for analysis. On the one hand, the composite design keeps the rotation and negative poisson ratio characteristics of the traditional rotary multi-deformation structure, and meanwhile, through the coupling connection of the reentrant structure and the thin-wall round structure 3, the deformation mode of the structure is changed, and the integral mechanical property and the energy absorption capacity of the structure are further enhanced.
Due to the complexity of the structure, the structure proposal provided by the application adopts the 3D printing technology to carry out integrated forming preparation, so that on one hand, the processing precision and the integrity of the structure are ensured, on the other hand, the processing cost can be reduced, and the processing efficiency is improved. It should be noted that the base material of the structure of the application can be metal such as aluminum alloy, stainless steel, titanium alloy, and the like, or nonmetal material such as nylon, resin, and the like, and can be selected according to specific application occasions and mechanical property requirements. In the analysis of this example, an aluminum alloy was selected as the base material to study the deformation and mechanical response of the structure. In order to clearly demonstrate the special deformation mode and stress-strain response of the structure of the application, compression simulation modeling is carried out on the structure by means of finite element analysis software ANSYS WORKBENCH LS-DYNA, the finite element simulation model of which is shown in fig. 2, the structure is placed between a movable platen 5 and a fixed base 6, a fixed constant speed is applied to the upper plate, the contact of the structure with the plate and the structure itself is set, and the deformation condition and the mechanical response of the structure under compression load are simulated. The results of the deformation mode and the mechanical response are shown in fig. 3 and 4.
As shown in fig. 2, the structure maintains the characteristics of three-step deformation and three stage stages in the range of 0 ° < phi <90 °, but the corresponding local strain at the beginning and end of the stage is changed; at 55 ° < α <75 °, the structure maintains its original characteristics, and the strain is also changed. For parameters l and t, the platform stress of the structure is increased with the decrease of l and the increase of t, and the change of parameters l1 and t1 has less influence on the overall mechanical property and deformation characteristic of the structure. The influence rule of the geometric parameters on the structure has guiding significance on the further optimization design of the structure, so that the proper geometric parameters of the structure can be selected according to the actual engineering index requirements so as to meet different application requirements.
As can be seen from the figure, the present embodiment, under a longitudinal compressive load, firstly causes a rotational movement of the star-shaped structures and a significant transverse contraction of the whole, exhibiting a negative poisson's ratio effect, thanks to the beam-like connection between the star-shaped structures, around which the star-shaped structures are counter-rotated, due to the much lower strength of the beam-like connection than the star-shaped-round coupling structures, causing a bending deformation of the beam-shaped structures 4, leading to the generation of the first platform stage; then the structure is self-contacted to form a geometric structure 1, and a steep slope appears on a stress-strain curve; when compression is continued, the horizontal nodes in the geometric structure 1 further generate opposite shrinkage motions, the horizontal equivalent pair motions are converted into the relative motions of the vertical nodes through the coupling connection of the thin-wall circles and the angular points, the relative rotations of the vertical cell walls in the star-shaped structure are driven until the cell walls are rotated to be in self-contact horizontally, and the geometric structure 2 is formed, and the process is a second platform stage and is mainly formed by deformation of the cell walls of the star-shaped structure. When the compressive displacement continues to increase, the structure continues to deform, but unlike the first two steps, the overall lateral expansion occurs due to the separation of the partial beam-like structure 4, the intermediate unstable collapse occurs, so that the stress decreases, and when the partial walls come into contact, the stress begins to increase until all the walls come into full contact to densification, with a sharp increase in stress. The above-mentioned process is the deformation process of the present embodiment under the action of compression load, and it is obvious that the structure has two intermediate geometric structures, and compared with the random and unstable deformation modes of the existing structure, the intermediate geometric structures of the structure enable the structure to have a plurality of platform stresses, so that the overall compressive capacity of the structure is further improved, the deformation modes are stable and uniform, and the fluctuation of the stress in the compression process can be reduced, so that the energy absorption efficiency of the structure is improved.
Through parameter analysis, the geometric parameters of the structure in the application can obviously influence the overall performance, the rule of influence is shown in figure 5, and the result can provide diversified parameter selection for the application of the structure in different requirements and different occasions and has better adaptability. Through comparative study of the specific energy absorption, the specific energy absorption of the embodiment of the application has obvious three-section characteristics compared with the prior other structures, and corresponds to three platform stress stages, and the characteristics enable the whole structure to be higher than the specific energy absorption of the other structures, and more energy can be absorbed conveniently, as shown in fig. 6, the specific energy absorption of the embodiment of the application is higher than the prior other structures. In addition, in the application, general design rules are made for the geometric form of the thin-wall round structure 3, as shown in fig. 7, that is, on the basis of the thin-wall round, equal chord dividing points are introduced and then sequentially connected into closed polygons, only the coupling connection between four concave angle points 7 of the star-shaped structure and the angular points of the polygons is ensured, and the design rules are more flexible for the selection of the star-shaped constraint structure, so that the designability is stronger, and more choices are provided in engineering application. For example, in a three-step deformation and three-platform-stage negative poisson ratio structure based on an arc equal chord dividing strategy, under the condition that four corner points are guaranteed to be contacted together, equal chord dividing is carried out on an arc, namely a plurality of equal chord dividing points are inserted into each arc section and then connected in sequence, so that a closed polygon is formed. Different segmentation points can be selected in practical engineering application so as to obtain structures with different relative densities, meet different specific energy absorption requirements, and have larger flexibility and wide adaptability.
Finally, it should be noted that: the described embodiments are intended to be illustrative of only some, but not all, of the embodiments of the present application and, based on the embodiments herein, all other embodiments that may be made by those skilled in the art without the benefit of the present disclosure are intended to be within the scope of the present application.
While certain exemplary embodiments of the present application have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the application. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the application, which is defined by the appended claims.
Claims (5)
1. A composite negative Poisson ratio structure for buffering and absorbing energy is characterized by comprising,
the concave star-shaped structure is a hollow structure with a plurality of concave corner points, a thin-wall round structure serving as internal constraint is arranged in the hollow structure, the thin-wall round structure is coupled with the concave corner points, the concave star-shaped structure is connected with each other through a beam-shaped structure through a geometric mirror image and a periodic array to form a two-dimensional composite negative poisson ratio structure, the composite negative poisson ratio structure shows three stress platforms and three deformation steps under the action of compressive load, and the composite negative poisson ratio structure rotates around the beam-shaped connection in opposite directions, so that the beam-shaped structure is subjected to bending deformation, and a first platform stage is generated; then the composite negative poisson ratio structure is self-contacted to form a first geometric structure, and a steep slope appears on a stress-strain curve; when compression is continued, the horizontal nodes in the first geometric structure further generate opposite shrinkage motions, the horizontal relative motions are converted into the relative motions of the vertical nodes through the coupling connection of the thin-wall circles and the concave corner points, the relative rotations of the vertical cell walls in the star-shaped structure are driven until the cell walls are rotated to be in self-contact horizontally, a second geometric structure is formed, the process is a second platform stage, when compression displacement is continued to be increased, the composite negative poisson ratio structure is continued to be deformed, the whole body is transversely expanded due to the separation of part of the beam-shaped structure, the middle collapses, so that stress is reduced, and when part of the cell walls are in contact, the stress is increased until all the cell walls are in full contact to be densified;
wherein, the liquid crystal display device comprises a liquid crystal display device,
the beam-shaped structure is a thin-wall beam;
the strength of the beam-shaped structure is smaller than that of the concave star-shaped structure;
the thin-wall round structure is coupled and connected with all the concave angle points;
the concave star-shaped structure is a hollow structure with four concave corner points and is centrosymmetric, and the concave star-shaped structure is characterized in that the concave star-shaped structure is formed along the edge of the concave star-shaped structureyShaft mirrorArranging and then arranging the mirrored structure alongxThe axes are mirror-image arranged again to form a representative volume unit, and the representative volume unit is arranged along the axisxShaft and method for producing the sameyThe axes are periodically arrayed to form a two-dimensional periodic structure.
2. The composite negative poisson's ratio structure for buffering and absorbing energy according to claim 1, wherein the concave star structure is a centrosymmetric structure.
3. The composite negative poisson's ratio structure for buffering and absorbing energy according to claim 2, wherein the wall length of the hollowed-out structure is as followslAre all equal in cell wall thicknesstFollowing the cell wall elongation ratiot/l<1/10。
4. The composite negative poisson's ratio structure for buffering energy absorption according to claim 1, wherein the concave angleαThe method comprises the following steps: 55 degree<α<75 degrees, included angle between concave star-shaped structuresφThe method comprises the following steps: 0 degree (degree)<φ<90°。
5. The composite negative poisson's ratio structure for buffering energy absorption according to claim 1, wherein the material of the concave star structure is aluminum alloy, stainless steel, titanium alloy, nylon or resin.
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Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE831135A (en) * | 1974-07-08 | 1975-11-03 | PERFECTED SHOCK ABSORBER | |
| CA2598370A1 (en) * | 2006-09-07 | 2008-03-07 | University Of Delaware | Shear thickening fluid containment in polymer composites |
| CA2633067A1 (en) * | 2007-09-06 | 2009-03-06 | Powerdisk Development Ltd. | Energy storage and return spring |
| CN102107023A (en) * | 2011-01-30 | 2011-06-29 | 北京科技大学 | Preparation method of biological function composite auxetic hydrogel with shell core structure |
| CN102644688A (en) * | 2012-04-24 | 2012-08-22 | 北京航空航天大学 | Landing mechanism-based legged mechanical cushioning device |
| CN103148144A (en) * | 2013-03-14 | 2013-06-12 | 湖南大学 | Energy absorption device |
| CN103361811A (en) * | 2012-06-26 | 2013-10-23 | 香港理工大学 | Negative poisson ratio yarn structure and manufacturing method thereof |
| CN103573891A (en) * | 2013-11-14 | 2014-02-12 | 马正东 | Negative Poisson ratio structural component |
| CN104401020A (en) * | 2014-11-11 | 2015-03-11 | 山东大学 | Preparation method of geogrid with negative Poisson ratio |
| CN104763772A (en) * | 2015-03-31 | 2015-07-08 | 华南理工大学 | Buffering and energy absorbing structure |
| CN106457748A (en) * | 2014-01-24 | 2017-02-22 | 墨尔本皇家理工大学 | Structured porous metamaterial |
| CN106825542A (en) * | 2017-01-19 | 2017-06-13 | 吉林大学 | Negative poisson's ratio high-magnetostriction material and its increasing material manufacturing method |
| CN107276449A (en) * | 2017-06-07 | 2017-10-20 | 南京航空航天大学 | Chiral negative poisson's ratio structure based on dielectric type electroactive polymer |
| CN108394135A (en) * | 2018-02-09 | 2018-08-14 | 中山大学 | A kind of porous material structure with three-dimensional negative poisson's ratio |
| CN109854659A (en) * | 2019-03-08 | 2019-06-07 | 哈尔滨工程大学 | A kind of buffering vibration suppression structure having both indent and chiral Negative poisson's ratio |
| CN110173532A (en) * | 2019-06-27 | 2019-08-27 | 北京振冲工程机械有限公司 | A kind of shock damper |
| CN210715682U (en) * | 2019-10-16 | 2020-06-09 | 湖北汽车工业学院 | Three-dimensional negative Poisson ratio energy-absorbing filler structure |
| CN112049886A (en) * | 2020-09-10 | 2020-12-08 | 西安交通大学 | Chiral auxetic metamaterial structure with tension-torsion coupling characteristic and preparation method thereof |
| KR102243703B1 (en) * | 2020-01-15 | 2021-04-23 | 서울대학교산학협력단 | Metamaterial structure and complex structure including the same |
| CN113757290A (en) * | 2021-09-07 | 2021-12-07 | 中国科学院空间应用工程与技术中心 | Energy-absorbing superstructure monomer with negative Poisson's ratio and energy-absorbing superstructure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110059291A1 (en) * | 2009-09-07 | 2011-03-10 | Boyce Christopher M | Structured materials with tailored isotropic and anisotropic poisson's ratios including negative and zero poisson's ratios |
| CN113757281B (en) * | 2021-09-07 | 2023-01-10 | 中国科学院空间应用工程与技术中心 | Energy-absorbing unit body based on multistable state and energy-absorbing material |
-
2021
- 2021-12-08 CN CN202111491086.9A patent/CN114941673B/en active Active
Patent Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE831135A (en) * | 1974-07-08 | 1975-11-03 | PERFECTED SHOCK ABSORBER | |
| CA2598370A1 (en) * | 2006-09-07 | 2008-03-07 | University Of Delaware | Shear thickening fluid containment in polymer composites |
| CA2633067A1 (en) * | 2007-09-06 | 2009-03-06 | Powerdisk Development Ltd. | Energy storage and return spring |
| CN102107023A (en) * | 2011-01-30 | 2011-06-29 | 北京科技大学 | Preparation method of biological function composite auxetic hydrogel with shell core structure |
| CN102644688A (en) * | 2012-04-24 | 2012-08-22 | 北京航空航天大学 | Landing mechanism-based legged mechanical cushioning device |
| CN103361811A (en) * | 2012-06-26 | 2013-10-23 | 香港理工大学 | Negative poisson ratio yarn structure and manufacturing method thereof |
| CN103148144A (en) * | 2013-03-14 | 2013-06-12 | 湖南大学 | Energy absorption device |
| CN103573891A (en) * | 2013-11-14 | 2014-02-12 | 马正东 | Negative Poisson ratio structural component |
| CN106457748A (en) * | 2014-01-24 | 2017-02-22 | 墨尔本皇家理工大学 | Structured porous metamaterial |
| CN104401020A (en) * | 2014-11-11 | 2015-03-11 | 山东大学 | Preparation method of geogrid with negative Poisson ratio |
| CN104763772A (en) * | 2015-03-31 | 2015-07-08 | 华南理工大学 | Buffering and energy absorbing structure |
| CN106825542A (en) * | 2017-01-19 | 2017-06-13 | 吉林大学 | Negative poisson's ratio high-magnetostriction material and its increasing material manufacturing method |
| CN107276449A (en) * | 2017-06-07 | 2017-10-20 | 南京航空航天大学 | Chiral negative poisson's ratio structure based on dielectric type electroactive polymer |
| CN108394135A (en) * | 2018-02-09 | 2018-08-14 | 中山大学 | A kind of porous material structure with three-dimensional negative poisson's ratio |
| CN109854659A (en) * | 2019-03-08 | 2019-06-07 | 哈尔滨工程大学 | A kind of buffering vibration suppression structure having both indent and chiral Negative poisson's ratio |
| CN110173532A (en) * | 2019-06-27 | 2019-08-27 | 北京振冲工程机械有限公司 | A kind of shock damper |
| CN210715682U (en) * | 2019-10-16 | 2020-06-09 | 湖北汽车工业学院 | Three-dimensional negative Poisson ratio energy-absorbing filler structure |
| KR102243703B1 (en) * | 2020-01-15 | 2021-04-23 | 서울대학교산학협력단 | Metamaterial structure and complex structure including the same |
| CN112049886A (en) * | 2020-09-10 | 2020-12-08 | 西安交通大学 | Chiral auxetic metamaterial structure with tension-torsion coupling characteristic and preparation method thereof |
| CN113757290A (en) * | 2021-09-07 | 2021-12-07 | 中国科学院空间应用工程与技术中心 | Energy-absorbing superstructure monomer with negative Poisson's ratio and energy-absorbing superstructure |
Non-Patent Citations (1)
| Title |
|---|
| 任鑫.负泊松比材料和结构的研究进展.2019,第51卷(第3期),656-687. * |
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