CN115574033A - Three-dimensional bionic fishbone negative Poisson ratio lattice and honeycomb combined structure - Google Patents

Three-dimensional bionic fishbone negative Poisson ratio lattice and honeycomb combined structure Download PDF

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Publication number
CN115574033A
CN115574033A CN202211207884.9A CN202211207884A CN115574033A CN 115574033 A CN115574033 A CN 115574033A CN 202211207884 A CN202211207884 A CN 202211207884A CN 115574033 A CN115574033 A CN 115574033A
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China
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lattice
fishbone
top plate
negative poisson
honeycomb
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CN202211207884.9A
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Chinese (zh)
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李方义
黄捷
张强
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Guangzhou University
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Guangzhou University
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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
    • 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
    • F16F7/121—Vibration-dampers; Shock-absorbers using plastic deformation of members the members having a cellular, e.g. honeycomb, structure
    • 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
    • F16F2224/00—Materials; Material properties
    • F16F2224/02—Materials; Material properties solids
    • F16F2224/0225—Cellular, e.g. microcellular foam
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

The invention relates to the technical field of negative Poisson ratio lattice lattices, in particular to a three-dimensional bionic fishbone negative Poisson ratio lattice and a honeycomb combined structure. The three-dimensional bionic fishbone negative Poisson ratio lattice comprises a plurality of uniformly distributed struts, wherein the struts are connected through nodes; the strut comprises a bottom plate, a side plate and a top plate; the bottom plate and the top plate are respectively connected with the first end and the second end of the top plate; the top plate and the bottom plate are respectively positioned at two sides of the top plate, and included angles exist among the top plate, the bottom plate and the top plate. According to the invention, through the contact of the connection mode of the honeycomb crystal lattice, a lattice connection mode different from the traditional structure is adopted, so that the crystal lattice can not generate macroscopic inclination along with uneven stress after deformation under the condition of uniaxial compression.

Description

Three-dimensional bionic fishbone negative Poisson ratio lattice and honeycomb combined structure
Technical Field
The invention relates to the technical field of negative Poisson ratio lattice, in particular to a three-dimensional bionic fishbone negative Poisson ratio lattice and a honeycomb combined structure.
Background
The French scientist Sim' eon Denis Poisson (Simon Deni Poisson) proposed in 1829 the concept of Poisson ratio v, which can be understood as the property of the material to deform in a lateral displacement perpendicular to the direction of the applied force, also known as the lateral deformation coefficient.
The negative poisson ratio mechanical metamaterial has unique properties different from common materials, and has the advantages of high energy absorption, high specific stiffness, shock resistance, shock insulation and absorption and the like. However, with the continuous efforts of scientists, the research on the innovation of a single negative poisson ratio structure is very difficult, and the combination of the negative poisson ratio metamaterial structure and other field structures is the first trend of future development.
The lattice structure has been widely applied to the fields of vehicles and ships, aerospace, ocean engineering and the like by virtue of the characteristics of light weight, low density, high strength, strong specific energy absorption and the like. With the continuous development of additive manufacturing technology, irregular metal material structures can also be simply manufactured, so that the metal lattice structure is likely to go from finite element simulation to experiment, and as shown in "china manufacturing 2025", the 3D printing technology of SLM process will be the key point of development in the intelligent manufacturing industry. The lattice structure proposed by Gibson of the massachusetts institute of technology and Ashby of cambridge university, etc., can well make up for the defect of the negative poisson ratio honeycomb structure.
The types of the common negative poisson ratio structures at present are limited (particularly three-dimensional negative poisson ratio structures), the application of the negative poisson ratio structures in practical engineering is not wide, and the negative poisson ratio structures are stable and easy to collapse in the compression and stretching processes.
Disclosure of Invention
The invention aims to provide a three-dimensional bionic fishbone negative Poisson ratio lattice, which can solve the problem that a negative Poisson ratio structure in the prior art is relatively stable and easy to collapse in the compression and stretching processes;
a second objective of the present invention is to provide a honeycomb composite structure, which comprises the three-dimensional bionic fishbone negative poisson ratio lattice as described above.
Aiming at the aim, the invention provides a three-dimensional bionic fishbone negative poisson ratio lattice, which comprises a plurality of uniformly distributed struts, wherein the struts are connected through nodes;
the supporting column comprises a bottom plate, a side plate and a top plate;
the bottom plate and the top plate are respectively connected with the first end and the second end of the top plate;
the top plate and the bottom plate are respectively positioned at two sides of the top plate, and included angles exist among the top plate, the bottom plate and the top plate.
Preferably, the length of the bottom plate is c =84.4mm, the length of the side plate is b =94.5mm, and the length of the top plate is a =20.7mm.
Preferably, the top plate and the side plate form an angle α =60 °, the projection angle between the two top plates is γ =120 °, and the projection angle between the two bottom plates is δ =210 °.
Preferably, the three-dimensional bionic fishbone negative poisson ratio lattice comprises three uniformly distributed upright columns, the lattice is of a left-right symmetrical structure, and an included angle between two adjacent side plates is theta =128 degrees.
A honeycomb composite structure comprising the three-dimensional bionic fishbone negative poisson ratio lattice as described in any one of the above items;
the honeycomb composite structure is formed by stacking lattice lattices.
Preferably, the lattice stacked in the vertical direction has an angle σ between a bottom plate of the lattice located above and a top plate of the lattice located below.
Preferably, two adjacent three-dimensional bionic fishbone structures are sequentially connected through a joint face formed between the bottom plate and the side plate and arranged in a honeycomb shape, the joint faces are shared to form a honeycomb structure, then three-dimensional bionic fishbone negative Poisson ratio lattice lattices and honeycomb combination structures thereof are formed by up-down lamination, and the three-dimensional bionic fishbone negative Poisson ratio lattice lattices and the honeycomb combination structures are transversely and longitudinally expanded and arranged and combined in the mode.
Preferably, the lattice size, size and material of the lattice constituting the honeycomb composite structure are consistent.
Preferably, the lattice and honeycomb composite structure is made by an additive manufacturing process.
Has the beneficial effects that:
1. the stability of the negative poisson's ratio structure is improved. According to the invention, a lattice connection mode different from the traditional structure is adopted on the contact of the connection mode of the honeycomb lattice, so that the lattice can not generate macroscopic tilt along with uneven stress after deformation under the condition of uniaxial compression.
2. The invention relates to a three-dimensional bionic fishbone negative Poisson ratio lattice integrating a lattice structure and a negative Poisson ratio structure and a honeycomb combined structure thereof, wherein each three-dimensional structure cell has the same size, so that the three-dimensional structure cells in each section can synchronously deform in the impact process, the energy absorption efficiency is improved, and the stability of the impact resistance process is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 (FIG. 1a, FIG. 1 b) is a schematic diagram of the three-dimensional bionic fishbone negative Poisson ratio structure size parameter in the invention;
FIG. 2 is a schematic diagram of a negative Poisson's ratio structure of a three-dimensional bionic fishbone in the invention;
FIG. 3 is a schematic diagram of an array structure formed by stacking three-dimensional bionic fishbone negative Poisson ratio structures in the invention;
FIG. 4 is a front view of a three-dimensional bionic fishbone negative Poisson's ratio lattice and a honeycomb combination structure thereof;
FIG. 5 is a schematic diagram of a three-dimensional bionic fishbone negative Poisson's ratio lattice and a connection mode of a honeycomb combined structure thereof;
FIG. 6 is a top view of a three-dimensional bionic fishbone negative Poisson's ratio lattice and a honeycomb combined structure thereof;
FIG. 7 is an isometric view of a three-dimensional bionic fishbone negative Poisson's ratio lattice and a honeycomb combined structure thereof;
FIG. 8 is a schematic view of compressive deformation of a three-dimensional bionic fishbone negative Poisson's ratio lattice and a honeycomb combined structure thereof in a process of strain epsilon = 0.0-0.5.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it is to 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", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "coupled" are to be construed broadly and may include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 7, the present invention provides a three-dimensional bionic fishbone negative poisson's ratio lattice, which includes a plurality of uniformly distributed struts, and the struts are connected by nodes.
The pillar includes bottom plate, curb plate and roof, and bottom plate and roof are connected with the first end and the second end of roof respectively.
The top plate and the bottom plate are respectively positioned at two sides of the top plate, and included angles exist among the top plate, the bottom plate and the top plate.
Specifically, the bottom plate length is c =84.4mm, the side plate length is b =94.5mm, and the top plate length is a =20.7mm.
The included angle between the top plate and the side plate is alpha =60 °, the projection angle between the two top plates is gamma =120 °, and the projection angle between the two bottom plates is delta =210 °.
The three-dimensional bionic fishbone negative Poisson ratio lattice comprises three uniformly distributed upright posts, the lattice is of a bilateral symmetry structure, and an included angle between two adjacent side plates is theta =128 degrees.
In this embodiment, a honeycomb composite structure is further provided, which includes the three-dimensional bionic fishbone negative poisson ratio lattice as described above, and the honeycomb composite structure is formed by stacking lattice lattices.
And the included angle between the bottom plate of the lattice positioned above and the top plate of the lattice positioned below is sigma.
Two adjacent three-dimensional bionic fishbone structures are sequentially connected through joint faces formed between the bottom plate and the side plates and arranged in a honeycomb manner, the joint faces are shared to form a honeycomb structure, then three-dimensional bionic fishbone negative Poisson ratio lattice lattices and honeycomb combination structures thereof are formed by up-down lamination, and the three-dimensional bionic fishbone negative Poisson ratio lattice lattices and the honeycomb combination structures are transversely and longitudinally expanded and arranged and combined according to the mode. The connection mode of the lattice lattices improves the stability of the negative Poisson ratio structure. According to the invention, a lattice connection mode different from the traditional structure is adopted on the contact of the connection mode of the honeycomb lattice, so that the lattice can not generate macroscopic tilt along with uneven stress after deformation under the condition of uniaxial compression.
The lattice size, dimension and material of the lattice composing the honeycomb composite structure are consistent.
The combined structure is a three-dimensional bionic fishbone negative Poisson ratio lattice integrated with a dot matrix structure and a negative Poisson ratio structure and a honeycomb combined structure thereof, wherein each three-dimensional structure cell has the same size, so that the three-dimensional structure cells in each section can synchronously deform in the impact process, the energy absorption efficiency is improved, and the stability of the impact resistance process is improved.
The lattice and honeycomb composite structure is made by an additive manufacturing process.
In summary, the lattice and honeycomb combination structure provided by the present embodiment has the following advantages:
by combining the lattice structure and the honeycomb structure thereof, a negative Poisson ratio structure with good negative Poisson ratio performance is designed. By contacting the honeycomb crystal lattices in a connection mode, a lattice connection mode different from the traditional structure is adopted, so that the crystal lattices are relatively stable in the compression process.
The composite structure can realize obvious negative Poisson ratio characteristic when in compression deformation.
The honeycomb combined structure has a multi-azimuth negative Poisson ratio characteristic on a local unit, and also has a multi-azimuth negative Poisson ratio characteristic on the whole structure.
The combination mode of the honeycomb structure is different from the lattice connection mode of the traditional structure, and the honeycomb structure is arranged and combined in the transverse direction and the longitudinal direction according to the mode.
As shown in fig. 8, the overall structure generally has a more pronounced negative poisson's ratio characteristic of compressive tapering and narrowing during strain ∈ = 0.0-0.5, and is more pronounced than the classical honeycomb structure.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.

Claims (9)

1. A three-dimensional bionic fishbone negative Poisson ratio lattice is characterized by comprising a plurality of uniformly distributed struts, wherein the struts are connected through nodes;
the strut comprises a bottom plate, a side plate and a top plate;
the bottom plate and the top plate are respectively connected with the first end and the second end of the top plate;
the top plate and the bottom plate are respectively positioned at two sides of the top plate, and included angles exist among the top plate, the bottom plate and the top plate.
2. The three-dimensional bionic fishbone negative Poisson ratio lattice of the claim 1, wherein the bottom plate is c =84.4mm in length, the side plate is b =94.5mm in length, and the top plate is a =20.7mm in length.
3. The three-dimensional bionic fishbone negative Poisson ratio lattice of claim 1, wherein the included angle between the top plate and the side plate is α =60 °, the projection angle between the two top plates is γ =120 °, and the projection angle between the two bottom plates is δ =210 °.
4. The three-dimensional bionic fishbone negative Poisson ratio lattice according to claim 1, wherein the three-dimensional bionic fishbone negative Poisson ratio lattice comprises three uniformly distributed upright posts, the lattice is in a bilateral symmetry structure, and an included angle between two adjacent side plates is θ =128 °.
5. A honeycomb composite structure, comprising the three-dimensional bionic fishbone negative poisson's ratio lattice according to any one of claims 1-4;
the honeycomb composite structure is formed by stacking lattice lattices.
6. The honeycomb composite structure of claim 5, wherein the lattice lattices stacked in the vertical direction have an angle σ between a bottom plate of the lattice located above and a top plate of the lattice located below.
7. The honeycomb composite structure according to claim 5, wherein two adjacent three-dimensional bionic fishbone structures are sequentially connected through the joint faces formed between the bottom plate and the side plates and arranged in a honeycomb shape, the joint faces are shared to form a honeycomb structure, then three-dimensional bionic fishbone negative Poisson's ratio lattice lattices and the honeycomb composite structure thereof are formed by stacking up and down, and the three-dimensional bionic fishbone negative Poisson's ratio lattice lattices and the honeycomb composite structure thereof are transversely and longitudinally expanded and arranged and combined in this way.
8. The honeycomb composite structure of claim 5 wherein the lattice size, dimensions and materials comprising the honeycomb composite structure are uniform.
9. The honeycomb composite structure of claim 5 wherein the lattice and honeycomb composite structure are made by an additive manufacturing process.
CN202211207884.9A 2022-09-30 2022-09-30 Three-dimensional bionic fishbone negative Poisson ratio lattice and honeycomb combined structure Pending CN115574033A (en)

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Application Number Priority Date Filing Date Title
CN202211207884.9A CN115574033A (en) 2022-09-30 2022-09-30 Three-dimensional bionic fishbone negative Poisson ratio lattice and honeycomb combined structure

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CN115574033A true CN115574033A (en) 2023-01-06

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