CN116920169A - Three-dimensional negative poisson ratio metamaterial unit cell and array structure and manufacturing method thereof - Google Patents

Three-dimensional negative poisson ratio metamaterial unit cell and array structure and manufacturing method thereof Download PDF

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Publication number
CN116920169A
CN116920169A CN202310888437.2A CN202310888437A CN116920169A CN 116920169 A CN116920169 A CN 116920169A CN 202310888437 A CN202310888437 A CN 202310888437A CN 116920169 A CN116920169 A CN 116920169A
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connecting rod
unit cell
cell structure
rod
poisson ratio
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王鲁宁
高加起
李亚庚
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University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/02—Inorganic materials
    • A61L27/04—Metals or alloys
    • A61L27/047—Other specific metals or alloys not covered by A61L27/042 - A61L27/045 or A61L27/06
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/28—Bones
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
    • A61L27/56—Porous materials, e.g. foams or sponges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/14—Treatment of metallic powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/14—Treatment of metallic powder
    • B22F1/142—Thermal or thermo-mechanical treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
    • B33Y40/10—Pre-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/28—Bones
    • A61F2002/2835—Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/3006—Properties of materials and coating materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/3094—Designing or manufacturing processes
    • A61F2002/30985—Designing or manufacturing processes using three dimensional printing [3DP]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2430/00—Materials or treatment for tissue regeneration
    • A61L2430/02—Materials or treatment for tissue regeneration for reconstruction of bones; weight-bearing implants
    • 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 invention relates to a three-dimensional negative poisson ratio metamaterial unit cell and an array structure and a manufacturing method thereof, in particular to the technical field of orthopedic medical instruments. The invention enriches the three-dimensional negative poisson ratio design and improves the mechanical property of the negative poisson ratio structure in the medical field.

Description

Three-dimensional negative poisson ratio metamaterial unit cell and array structure and manufacturing method thereof
Technical Field
The invention relates to the technical field of orthopedic medical instruments, in particular to a three-dimensional negative poisson ratio metamaterial unit cell and array structure and a manufacturing method thereof.
Background
The problem of aging population is increasingly remarkable, and zinc alloy are favored in the degradable metal implantation materials currently mainstream in the field of bone injury repair due to moderate degradation rate and good biocompatibility. The biomedical material needs to provide corresponding growth space and attachment environment for proliferation and regeneration of human cells, and is usually prepared into a communicated porous structure. The metamaterial has special properties through special structural design, wherein the negative poisson ratio metamaterial has excellent mechanical properties such as fracture resistance besides the special poisson ratio, and meanwhile, the research discovers that the negative poisson ratio structure is closer to the structural characteristics of natural bone tissues of a human body, is favorable for cell proliferation and differentiation, can effectively promote regeneration and repair of tissues of a patient as an implant structure, and has good biocompatibility. However, the two-dimensional structure of the currently reported negative poisson ratio structure is more studied, and the three-dimensional negative poisson ratio structure is lacking. Meanwhile, the general negative poisson ratio structure has insufficient mechanical property and relatively low strength, and the problem of stress concentration of the connecting node is remarkable, so that the practical application requirement is difficult to meet.
Chinese patent publication No.: CN111063403B discloses a novel three-dimensional negative poisson ratio honeycomb structure, which comprises a combination body and a connector, wherein the combination body comprises a monomer and a side connector, the monomer is a concave hexagon, the side connector is a monomer with a through groove, the width of the through groove is the same as that of the monomer, the side connector is fixedly connected to the middle parts of planes on two sides of the monomer, the connector is respectively fixedly connected to the monomer and the side connector, and the combination bodies of a plurality of groups are in honeycomb shape through a connector array. However, the mechanical properties of the structure in the scheme are insufficient in the implementation process, and the mechanical property enhancement design of the negative poisson ratio structure is not performed based on the requirements of the medical field.
Disclosure of Invention
Therefore, the invention provides a three-dimensional negative poisson ratio metamaterial unit cell and array structure and a manufacturing method thereof, which are used for solving the problems of lack of three-dimensional negative poisson ratio structure design and insufficient mechanical property of a simple negative poisson ratio structure in the medical field in the prior art.
In order to achieve the above purpose, in one aspect, the present invention provides a three-dimensional negative poisson ratio metamaterial unit cell structure, wherein the unit cell structure is formed by connecting rods in a concave manner, the connecting rods are cylindrical rods with circular cross sections, and the unit cell structure comprises:
the first connecting rod is connected with the second connecting rod, the third connecting rod and the fourth connecting rod through a first indent node, the first connecting rod is connected with the fifth connecting rod and the twenty-third connecting rod through a fourth vertex, the second connecting rod is connected with the sixth connecting rod and the twenty-third connecting rod through a third vertex, the sixth connecting rod is connected with the fifth connecting rod, the seventh connecting rod and the eighth connecting rod through a second indent node, the seventh connecting rod is connected with the ninth connecting rod and the nineteenth connecting rod through a fifth vertex, the eighth connecting rod is connected with the twenty-fourth connecting rod and the twelfth connecting rod through a sixth vertex, the twelfth connecting rod is connected with the tenth connecting rod, the eleventh connecting rod is connected with the twenty-fourth connecting rod and the twenty-third connecting rod through a eighth vertex, the thirteenth connecting rod is connected with the thirteenth connecting rod and the seventeenth connecting rod through a seventh vertex, the thirteenth connecting rod is connected with the thirteenth connecting rod through a fourth indent node, the fifteenth connecting rod and the eighteenth connecting rod, the sixteenth connecting rod is connected with the third connecting rod and the eighteenth connecting rod through a fifth vertex, the sixteenth connecting rod is connected with the twenty-eighth connecting rod and the twenty-eighth connecting rod, the twenty-eighth connecting rod is connected with the twenty-eighth connecting rod through a twenty-eighth indent node, the twenty-eighth connecting rod and the twenty-eighth connecting rod.
Further, the distance between each vertex and the adjacent vertex in the same plane in the single cell structure is the side length n of the single cell structure, the side length is set to be more than 0mm and less than 100mm, and the side lengths of the single cell structure are equal.
Further, the rod diameter of the connecting rod in the unit cell structure is d, the rod diameters of the connecting rods in the unit cell structure are equal, and d is more than 0 and less than 0.5 Xn.
Further, defining the distance from each concave node in the unit cell structure to the center of the unit cell structure as a concave degree parameter a, and setting 0 < a < 0.5 Xn.
Further, the unit cell structure is provided with external reinforcing rods, the external reinforcing rods are cylindrical rods with circular sections, each external reinforcing rod is used for being connected with a concave node of an adjacent unit cell structure, the unit cell structure provided with the external reinforcing rods is defined as an A-type reinforced unit cell structure, the length of each external reinforcing rod is La, and La=n-2×a is set.
Further, the unit cell structure is provided with inscribed reinforcing rods, each inscribed reinforcing rod is a cylindrical rod with a circular section, each inscribed reinforcing rod is used for connecting two opposite concave nodes in the same unit cell structure, the unit cell structure provided with the inscribed reinforcing rods is defined as a B-type reinforcing unit cell structure, the inscribed reinforcing rods of the B-type reinforcing unit cell structure are intersected at the body center of the unit cell structure, the inscribed reinforcing rods are connected in a boolean operation intersection mode, the length of each inscribed reinforcing rod is Lb, and lb=2×a is set.
Further, the rod diameters of the external reinforcing rods of the unit cell structures are da, the rod diameters of the external reinforcing rods are equal, the rod diameters of the internal reinforcing rods of the unit cell structures are db, the rod diameters of the internal reinforcing rods are equal, and d=da=db is set.
Further, the preparation materials of the unit cell structure, the A-type reinforced unit cell structure and the B-type reinforced unit cell structure include, but are not limited to, zinc and zinc alloys.
On the other hand, the invention also provides a three-dimensional negative poisson ratio metamaterial array structure, which is formed by connecting the vertexes of each unit cell structure in an array manner.
On the other hand, the invention also provides a manufacturing method of the three-dimensional negative poisson ratio metamaterial unit cell and array structure, which comprises the following steps:
step S1, vibrating and screening pure Zn powder by using a 200-mesh screen to obtain powder particles with the particle size of 15-53 mu m, placing the powder particles into a vacuum drying oven, setting the drying temperature to 80 ℃, carrying out vacuum drying for 10 hours, naturally cooling to room temperature after drying, taking out the powder particles to obtain powder particles with the humidity of less than 10%, and filling the powder particles into a powder bottle of SLM equipment;
step S2, setting the temperature of a platform substrate of the SLM equipment to be a preset platform substrate temperature Ts lm, setting the wind speed of a wind field to be a preset wind speed V1, setting the laser scanning power of printing boundary parameters to be a preset power W1, setting the boundary scanning speed to be a preset boundary scanning speed Vbs, setting the laser scanning power of printing parameters to be a preset scanning power Ws, setting the printing scanning speed to be a preset scanning speed Vs, and setting the layer thickness to be a preset layer thickness Ds lm;
step S3, polishing and sand blasting are carried out on a Platform substrate of the SLM equipment to obtain a Platform substrate with the surface parallelism of 0.02 and the roughness of 0.8, absolute ethyl alcohol is used for cleaning the surface of a scraper bar of the SLM equipment to obtain a scraper bar with no obvious scratch on the surface, a Flood inlet and a Flood outlet of the SLM equipment are started to carry out a large amount of Gas washing, simultaneously Platform forming and Water cooling are started, after the equipment sensor shows that the oxygen content in a forming cavity is lower than 2%, gas pump and Gas control are started, and after the oxygen content is lower than 0.05%, a printing task is started;
and S4, separating the printed sample from the substrate through linear cutting, and sequentially using absolute ethyl alcohol, pickling solution and absolute ethyl alcohol for ultrasonic cleaning treatment and blow-drying the sample.
Compared with the prior art, the invention has the beneficial effects that the unit cell structure is formed by connecting the connecting rods in a concave way, so that the structure with the negative Poisson ratio effect is formed, so that the structure is close to the structural characteristics of natural bone tissues of a human body, and has excellent mechanical properties such as fracture resistance and the like.
In particular, the sides of the unit cell structure are of equal length to facilitate the array of unit cell structures.
In particular, the negative poisson ratio effect is realized by setting the concave degree parameter to be less than half of the side length so that the unit cell structure is a concave structure.
In particular, an A-type reinforced unit cell structure is obtained by arranging an external reinforcing rod, so that the mechanical property of the unit cell structure is reinforced, the stress concentration of the negative poisson ratio structure is optimized, and the mechanical property of the negative poisson ratio structure in the medical field is improved.
In particular, the B-type reinforced unit cell structure is obtained by arranging the inscription reinforcing rod, so that the mechanical property of the unit cell structure is reinforced, the stress concentration of the negative poisson ratio structure is optimized, and the mechanical property of the negative poisson ratio structure in the medical field is improved.
In particular, the preparation materials of the single cell structure, the A-type reinforced single cell structure and the B-type reinforced single cell structure comprise zinc and zinc alloy, but are not limited to zinc and zinc alloy, so that the single cell structure has good biocompatibility in a human body and has mechanical and mechanical properties matched with the needs of human tissues.
Drawings
Fig. 1 is a schematic structural diagram of a three-dimensional negative poisson ratio metamaterial unit cell structure according to the embodiment;
FIG. 2 is a schematic structural diagram of a three-dimensional negative poisson ratio metamaterial A-type reinforced cell structure according to the embodiment;
FIG. 3 is a schematic structural diagram of a B-type reinforced cell structure of a three-dimensional negative Poisson ratio metamaterial according to the embodiment;
fig. 4 is a schematic structural diagram of a three-dimensional negative poisson ratio metamaterial array structure according to the embodiment;
fig. 5 is a flow chart of a method for manufacturing a three-dimensional negative poisson ratio metamaterial unit cell and array structure according to the embodiment.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Please refer to fig. 1, which is a schematic structural diagram of a three-dimensional negative poisson ratio metamaterial unit cell structure according to the present embodiment, wherein the unit cell structure is formed by connecting rods in a concave manner, and the shape of the connecting rods is characterized by cylindrical rods with circular cross sections, wherein:
the first connecting rod 16 is connected to the second connecting rod 17, the third connecting rod 18 and the fourth connecting rod 19 via a first female node 42, the first connecting rod 16 is connected to the fifth connecting rod 20 and the twenty-third connecting rod 31 via a fourth vertex 38, the second connecting rod 17 is connected to the sixth connecting rod 21 and the twenty-third connecting rod (not shown) via a third vertex 37, the sixth connecting rod 21 is connected to the fifth connecting rod 20, the seventh connecting rod 22 and the eighth connecting rod 23 via a second female node (not shown), the seventh connecting rod 22 is connected to the ninth connecting rod (not shown) via a fifth vertex 39 and a nineteenth connecting rod 30, the eighth connecting rod 23 is connected to the twenty-fourth connecting rod 34 and the twelfth connecting rod (not shown) via a sixth vertex 40, the twelfth connecting rod (not shown) is connected to the thirteenth connecting rod (not shown) via a thirteenth female node (not shown), the eleventh connecting rod (not shown) is connected to the fifth connecting rod 20, the seventh connecting rod 22 and the eighth connecting rod 23 via a ninth connecting rod (not shown), the eleventh connecting rod 22 is connected to the seventeenth connecting rod (not shown) via a thirteenth vertex 40 and a thirteenth connecting rod (not shown), the thirteenth connecting rod (not shown) via a thirteenth connecting rod 32 and a seventeenth connecting rod (not shown) via a seventeenth connecting rod 32, a seventeenth connecting rod (24) and a thirteenth connecting rod (not shown) via a seventeenth connecting rod 32, the fifteenth connecting rod 26 is connected with the third connecting rod 18 and the eighteenth connecting rod 29 through a first vertex 35, the sixteenth connecting rod 27 is connected with the fourth connecting rod 19 and the twenty-second connecting rod 33 through a second vertex 36, the eighteenth connecting rod 29, the nineteenth connecting rod 30, the twentieth connecting rod 31 and the seventeenth connecting rod 28 are connected through a fifth concave node 43, the twenty-first connecting rod 32, the twenty-second connecting rod 33, the twenty-third connecting rod (not shown) and the twenty-fourth connecting rod are connected through a sixth concave node (not shown), the connecting rods are connected in an intersection connection mode of Boolean operation, and cylindrical rods with circular cross sections of the connecting rods are connected.
Specifically, the unit cell structure is formed by connecting rods in a concave manner, so that a structure with a negative poisson ratio effect is formed, so that the structure is close to the structural characteristics of natural bone tissues of a human body, and has excellent mechanical properties such as fracture resistance and the like.
Specifically, the distance between each vertex and the adjacent vertex on the same plane in the unit cell structure is the side length n of the unit cell structure, the side length is set to be 0mm < n < 100mm, the side lengths of the unit cell structure are equal, for example, the distance between the first vertex and the fourth vertex is the first side length n1, the distance between the first vertex and the second vertex is the second side length n2, the distance between the first vertex and the seventh vertex is the third side length n3, and n1=n2=n3 is set.
Specifically, the lengths of the sides of the unit cell structure are equal, so that the unit cell structure is conveniently arrayed, and it can be understood that the range of the length n is not limited in particular in the embodiment, and a person skilled in the art can limit the value according to the pore size requirement and the manufacturing mode of the practical use environment, and only needs to meet the practical application and the manufacturing requirement, for example, the length n is less than 0mm and less than 100mm for the unit cell structure which is applied to human bone implantation and manufactured by using 3D printing.
Specifically, the rod diameters of the connecting rods in the unit cell structure are d, the rod diameters of the connecting rods in the unit cell structure are equal, and 0 < d < 0.5 Xn is set.
Specifically, the value of the rod diameter d takes the porosity of the human skeleton as an influence parameter, the rod diameter increases along with the reduction of the porosity of the human skeleton, the calculation mode of the rod diameter is not limited in detail, the rod diameter can be freely set by a person skilled in the art, only the requirement adapting to the porosity of the human skeleton is met, and the person skilled in the art can invert the value of the rod diameter d according to the porosity of the human skeleton when setting the value of the rod diameter d, such as setting the porosityV1 is the spatial volume of the unit cell structure, v1=n 3 V2 is the solid volume of the unit cell structure, and the solid volume V2 of the unit cell structure is measured using 3D digital modeling software such as cat ia to calculate the rod diameter D from V2.
Specifically, the distance from each concave node in the unit cell structure to the center of the unit cell structure is set as a concave degree parameter a, and 0 < a < 0.5×n is set.
Specifically, the negative poisson ratio effect is realized by setting the concave degree parameter to be smaller than half of the side length so that the unit cell structure is a concave structure.
Specifically, the concave degree parameter a takes the negative poisson ratio deformation range of the actual requirement as an influence parameter, the smaller the concave degree parameter a is, the larger the concave degree is, the more obvious the negative poisson ratio effect of the structure is, the value of a is not specifically limited, the method can be freely set by a person skilled in the art, and only the value of a is required to be met to meet the requirement of the concave structure, if the value of a can be selected according to the negative poisson ratio of the actual requirement.
Specifically, the rod length L of the unit cell structure is determined by the side length n of the unit cell structure and the concave degree parameter a, the rod lengths L of the connecting rods of the unit cell structure are equal, and l= v [ (0.5×n-a) is set 2 +(√2×0.5×n) 2 ]。
Please refer to fig. 2, which is a schematic structural diagram of the three-dimensional negative poisson ratio metamaterial a-type reinforced unit cell structure according to the present embodiment, the unit cell structure is provided with external reinforcing rods, each external reinforcing rod is a cylindrical rod with a circular cross section, and is used for being connected with an inner concave node of an adjacent unit cell structure, the unit cell structure provided with the external reinforcing rods is defined as an a-type reinforced unit cell structure, the length of the external reinforcing rods is La, la=n-2×a is set, wherein a first external reinforcing rod 44 is arranged on the first inner concave node 42 and is connected with the a-type reinforced unit cell structure in front, a second external reinforcing rod 45 is arranged on the second inner concave node (not shown in the figure), is connected with the a-type reinforced unit cell structure in right side, a third external reinforcing rod (not shown in the figure) is arranged on the third inner concave node (not shown in the figure), a-type reinforced unit cell structure in rear is defined, a fourth external reinforcing rod 46 is arranged on the fourth inner concave node (not shown in the figure), is connected with the a-type reinforced unit cell structure in left side, a fifth reinforcing rod is arranged on the fifth inner concave node (not shown in the figure), and is connected with the fifth reinforcing rod 48 in the outer concave node (not shown in the figure) and is arranged on the fifth inner concave node.
Specifically, an A-type reinforced unit cell structure is obtained by arranging an external reinforcing rod, so that the mechanical property of the unit cell structure is reinforced, the stress concentration of the negative poisson ratio structure is optimized, and the mechanical property of the negative poisson ratio structure in the medical field is improved.
Specifically, the number of external reinforcing rods of the a-type reinforcing unit cell structure is not limited in this embodiment, and a person skilled in the art can set the external reinforcing rods according to the requirement of the array structure, and when the a-type reinforcing unit cell structure is located at the outermost periphery of the array structure, the external reinforcing rods are not set at the concave nodes of the unconnected unit cell structure.
Referring to fig. 3, which is a schematic structural diagram of a three-dimensional B-type reinforced unit cell structure with negative poisson ratio metamaterial according to the present embodiment, the unit cell structure is provided with inscribed reinforcing rods 49, each inscribed reinforcing rod is a cylindrical rod with a circular cross section, each inscribed reinforcing rod is used for connecting two opposite concave nodes in the same unit cell structure, the unit cell structure provided with the inscribed reinforcing rods is defined as a B-type reinforced unit cell structure, the inscribed reinforcing rods of the B-type reinforced unit cell structure intersect at the body center of the unit cell structure, and the inscribed reinforcing rods are connected in a boolean operation intersection manner, the inscribed reinforcing rods have a length Lb, and lb=2xa is set.
Specifically, the B-type reinforced unit cell structure is obtained by arranging the inscription reinforcing rod, so that the mechanical property of the unit cell structure is reinforced, the stress concentration of the negative poisson ratio structure is optimized, and the mechanical property of the negative poisson ratio structure in the medical field is improved.
Specifically, the diameter of each external reinforcing rod of each unit structure is da, the diameter of each external reinforcing rod is equal, the diameter of each internal reinforcing rod of each unit structure is db, the diameters of each internal reinforcing rod are equal, d=da=db is set, and the shape characteristics of the external reinforcing rods and the internal reinforcing rods are consistent with the shape characteristics of the connecting rods.
Specifically, the shape characteristics of the connecting rod, the external reinforcing rod and the internal reinforcing rod are consistent, the shape characteristics of the connecting rod, the external reinforcing rod and the internal reinforcing rod are cylindrical rods with circular cross sections, the shape characteristics of the connecting rod, the external reinforcing rod and the internal reinforcing rod are not limited specifically, and a person skilled in the art can freely set according to actual requirements, such as a prismatic rod with the shape characteristics of the connecting rod being a regular octagon cross section can be further set.
Specifically, the preparation materials of the single cell structure, the A-type reinforced single cell structure and the B-type reinforced single cell structure comprise zinc and zinc alloy, but are not limited to zinc and zinc alloy, so that the single cell structure has good biocompatibility in human body and has mechanical and mechanical properties matched with the needs of human tissues.
Referring to fig. 4, which is a schematic structural diagram of the three-dimensional negative poisson ratio metamaterial array structure according to the present embodiment, the array structure is formed by connecting the vertices of each unit cell structure in an array, wherein the vertex array refers to connecting the vertices of each unit cell structure with the sixth unit cell structure 6 through the array, the first unit cell structure 1 is connected with the fourth unit cell structure 4 on the left through the first connection point 9, the second connection point 10, the third connection point 11 and the fourth connection point 12, the first unit cell structure 1 is connected with the second unit cell structure 2 through the third connection point 11, the fourth connection point 12, the fifth connection point 13 and the sixth connection point 14 on the rear, the first unit cell structure 1 is connected with the fifth unit cell structure 5 on the bottom through the first connection point 9, the fourth connection point 12, the sixth connection point 14 and the seventh connection point 15, the rear of the fifth unit cell structure 5 is connected with the sixth unit cell structure 6, the left of the fifth unit cell structure 5 is connected with the seventh unit cell structure 7, the rear of the seventh unit cell structure 7 is connected with the eighth unit cell structure 8, the upper side of the seventh unit cell structure 7 is connected with the fourth unit cell structure 4, the rear of the fourth unit cell structure 3 is connected with the fourth unit cell structure 4, the third unit cell structure 3 is connected with the sixth unit cell structure 2 on the bottom of the fourth unit cell structure 3.
Specifically, the unit cell structure constituting the array structure is not particularly limited in this embodiment, and a person skilled in the art may freely set the array structure according to the mechanical property requirement of the array structure, for example, an array structure may be formed by an a-type reinforced unit cell structure, an array structure may be formed by a B-type reinforced unit cell structure, and the like.
Specifically, the number of unit cell structures constituting the array structure is not particularly limited in this embodiment, and a person skilled in the art may freely set the array structure according to the mechanical property requirement of the array structure, for example, it may be set that the array structure is formed of a 4×4×5 unit cell structure.
Fig. 5 is a schematic flow chart of a method for manufacturing a three-dimensional negative poisson ratio metamaterial unit cell and array structure according to the present embodiment, which includes:
step S1, vibrating and screening pure Zn powder by using a 200-mesh screen to obtain powder particles with the particle size of 15-53 mu m, placing the powder particles into a vacuum drying oven, setting the drying temperature to 80 ℃, carrying out vacuum drying for 10 hours, naturally cooling to room temperature after drying, taking out the powder particles to obtain powder particles with the humidity of less than 10%, and filling the powder particles into a powder bottle of SLM equipment;
step S2, setting the temperature of a platform substrate of the SLM equipment to be a preset platform substrate temperature Tslm, setting the wind speed of a wind field to be a preset wind speed V1, setting the laser scanning power of printing boundary parameters to be a preset power W1, setting the boundary scanning speed to be a preset boundary scanning speed Vbs, setting the laser scanning power of printing parameters to be a preset scanning power Ws, setting the printing scanning speed to be a preset scanning speed Vs, and setting the layer thickness to be a preset layer thickness Dslm;
step S3, polishing and sand blasting are carried out on a Platform substrate of the SLM equipment to obtain a Platform substrate with the surface parallelism of 0.02 and the roughness of 0.8, absolute ethyl alcohol is used for cleaning the surface of a scraper bar of the SLM equipment to obtain a scraper bar with no obvious scratch on the surface, a Flood inlet and a Flood outlet of the SLM equipment are started to carry out a large amount of Gas washing, simultaneously Platform forming and Water cooling are started, after the equipment sensor shows that the oxygen content in a forming cavity is lower than 2%, gas pump and Gas control are started, and after the oxygen content is lower than 0.05%, a printing task is started;
and S4, separating the printed sample from the substrate through linear cutting, and sequentially using absolute ethyl alcohol, pickling solution and absolute ethyl alcohol for ultrasonic cleaning treatment and blow-drying the sample.
Specifically, the three-dimensional negative poisson ratio metamaterial unit cell and the array structure according to the embodiment are subjected to additive manufacturing by adopting the manufacturing method, the content of the sample in the step S4 is not specifically limited in the embodiment, and a person skilled in the art can limit the content according to manufacturing requirements, for example, the sample can be set to be in a unit cell structure, the sample can be set to be in an array structure of 4×4×5, and the like.
Specifically, the SLM device is a metal additive manufacturing or 3D printing technology device capable of performing selective laser melting, in this embodiment, the SLM device is SLM125 device of SLM solutions company, an air source of the SLM device is required to be 6-8bar, and the purity is not less than 99.996% of argon, the model selection of the SLM device is not specifically limited in this embodiment, and a person skilled in the art can freely set the device, and only needs to meet the requirements of single cell and array structure additive manufacturing.
Specifically, in the step S2, tslm is the preset platform substrate temperature, tslm is less than or equal to 50 ℃ and less than or equal to 200 ℃, V1 is the preset wind speed, V1 is less than or equal to 10.0m/S and less than or equal to 12.0m/S, W1 is the preset power, W1 is less than or equal to 100W and less than or equal to 400W, vbs is the preset boundary scan speed, vbs is less than or equal to 200mm/S and less than or equal to 1000mm/S, ws is the preset scan power, ws is less than or equal to 40W and less than or equal to 100W, vs is the preset scan speed, vs is less than or equal to 200mm/S and less than or equal to 1000mm/S, dslm is the preset layer thickness, and Dslm is less than or equal to 0.02mm and less than or equal to 0.05mm.
Specifically, the pickling solution in step S4 is a solution obtained by mixing 2% hydrochloric acid, 2% nitric acid and absolute ethanol.
Specifically, the application of the three-dimensional negative poisson ratio metamaterial unit cell and array structure in the embodiment is as follows:
example 1:
the array structure consists of a single cell structure, wherein the rod diameter d of the single cell structure is=0.3 mm, the concave degree parameter a is=0.5 mm, and the porosity is 84.26%.
Example 2:
the array structure consists of a single cell structure, wherein the rod diameter d of the single cell structure is=0.3 mm, the concave degree parameter a is=1 mm, and the porosity is 85.42%.
Example 3:
the array structure consists of a single cell structure, wherein the rod diameter d of the single cell structure is=0.5 mm, the concave degree parameter a is=0.5 mm, and the porosity is 64.92%.
Example 4:
the array structure consists of a single cell structure, wherein the rod diameter d of the single cell structure is=0.5 mm, the concave degree parameter a is=1 mm, and the porosity is 67.59%.
Example 5:
the array structure consists of an A-type reinforced unit cell structure, wherein the rod diameter d of the A-type reinforced unit cell structure is=0.3 mm, the concave degree parameter a is=0.5 mm, and the porosity is 82.84%.
Example 6:
the array structure consists of an A-type reinforced unit cell structure, wherein the rod diameter d of the A-type reinforced unit cell structure is=0.3 mm, the concave degree parameter a is=1 mm, and the porosity is 85.17%.
Example 7:
the array structure consists of an A-type reinforced unit cell structure, wherein the rod diameter d of the A-type reinforced unit cell structure is=0.5 mm, the concave degree parameter a is=0.5 mm, and the porosity is 61.98%.
Example 8:
the array structure consists of an A-type reinforced unit cell structure, wherein the rod diameter d of the A-type reinforced unit cell structure is=0.5 mm, the concave degree parameter a is=1 mm, and the porosity is 65.03%.
Example 9:
the array structure consists of a B-type reinforced unit cell structure, wherein the rod diameter d of the B-type reinforced unit cell structure is=0.3 mm, the concave degree parameter a is=0.5 mm, and the porosity is 83.52%.
Example 10:
the array structure consists of a B-type reinforced unit cell structure, wherein the rod diameter d of the B-type reinforced unit cell structure is=0.3 mm, the concave degree parameter a is=1 mm, and the porosity is 83.43%.
Example 11:
the array structure consists of a B-type reinforced unit cell structure, wherein the rod diameter d of the B-type reinforced unit cell structure is=0.5 mm, the concave degree parameter a is=0.5 mm, and the porosity is 63.85%.
Example 12:
the array structure consists of a B-type reinforced unit cell structure, wherein the rod diameter d of the B-type reinforced unit cell structure is=0.5 mm, the concave degree parameter a is=1 mm, and the porosity is 63.28%.
Comparative example 1:
the array structure consists of a simple cubic structure without a concave, the rod diameter d=0.6 mm of the simple cubic structure without the concave, and the porosity is 85.42%.
Comparative example 2:
the array structure consists of a simple cubic structure without a concave, the rod diameter d=1.1 mm of the simple cubic structure without the concave, and the porosity is 61.98%.
Specifically, examples 1-12 and comparative examples 1-2 were prepared using a 3D printing laser selective melting process with pure zinc, and were subjected to simulation test and compression test to solve Mises stress maximum by simulation setting a uniform load on the top surface 200N, and the compression test measured elastic modulus and yield strength, each array structure for carrying out the structure simulation test is respectively composed of a 2 multiplied by 2 unit cell structure, an A-type reinforced unit cell structure, a B-type reinforced unit cell structure and a simple cubic structure, each array structure for compression test is composed of a 4×4×5 unit cell structure, an a-type reinforced unit cell structure, a B-type reinforced unit cell structure and a simple cubic structure, and experimental data are shown in the following table:
specifically, as can be derived from experimental data, the Mises stress maximum of comparative example 1-2 without the concave array structure is significantly higher than that of examples 1-12 at the same porosity, the Mises stress maximum of comparative example 1 is 20510Pa, whereas example 2 with the same porosity as comparative example 1 is 15320Pa, the Mises stress maximum of comparative example 2 is 5156Pa, whereas example 7 with the same porosity as comparative example 2 is 2838Pa, the maximum stress values are reduced by 25.30% and 44.96%, respectively, and the designed negative poisson ratio structure exhibits a more uniform stress distribution than the comparative structure; comparing the array structure formed by the unit cell structure, the A-type reinforced unit cell structure and the B-type reinforced unit cell structure can find that the maximum Mises stress of the array structure formed by the A-type reinforced unit cell structure and the B-type reinforced unit cell structure is effectively reduced, and the stress concentration condition of the array structure formed by the unsupported reinforced unit cell structure is effectively reduced;
the overall elastic modulus and yield strength of the array structure composed of the a-type reinforced unit cell structure and the array structure composed of the B-type reinforced unit cell structure are higher than those of the array structure composed of the unit cell structure, so that effective improvement of mechanical properties is realized, and example 7 shows that the higher elastic modulus is due to higher degree of concave, and the concave nodes of the face center are in contact with the opposite nodes earlier in the compression process, so that the elastic modulus is close to that of comparative example 2.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.

Claims (10)

1. The utility model provides a three-dimensional burden poisson ratio metamaterial unit cell structure, its characterized in that, unit cell structure carries out indent connection by each connecting rod and constitutes, and the connecting rod is the cylindric pole of circular cross-section, wherein:
the first connecting rod is connected with the second connecting rod, the third connecting rod and the fourth connecting rod through a first indent node, the first connecting rod is connected with the fifth connecting rod and the twenty-third connecting rod through a fourth vertex, the second connecting rod is connected with the sixth connecting rod and the twenty-third connecting rod through a third vertex, the sixth connecting rod is connected with the fifth connecting rod, the seventh connecting rod and the eighth connecting rod through a second indent node, the seventh connecting rod is connected with the ninth connecting rod and the nineteenth connecting rod through a fifth vertex, the eighth connecting rod is connected with the twenty-fourth connecting rod and the twelfth connecting rod through a sixth vertex, the twelfth connecting rod is connected with the tenth connecting rod, the eleventh connecting rod is connected with the twenty-fourth connecting rod and the twenty-third connecting rod through a eighth vertex, the thirteenth connecting rod is connected with the thirteenth connecting rod and the seventeenth connecting rod through a seventh vertex, the thirteenth connecting rod is connected with the thirteenth connecting rod through a fourth indent node, the fifteenth connecting rod and the eighteenth connecting rod, the sixteenth connecting rod is connected with the third connecting rod and the eighteenth connecting rod through a fifth vertex, the sixteenth connecting rod is connected with the twenty-eighth connecting rod and the twenty-eighth connecting rod, the twenty-eighth connecting rod is connected with the twenty-eighth connecting rod through a twenty-eighth indent node, the twenty-eighth connecting rod and the twenty-eighth connecting rod.
2. The three-dimensional negative poisson ratio metamaterial unit cell structure according to claim 1, wherein the distance between each vertex and the adjacent vertex on the same plane in the unit cell structure is the side length n of the unit cell structure, the side length is set to be 0mm < n < 100mm, and the side lengths of the unit cell structure are equal.
3. The three-dimensional negative poisson ratio metamaterial unit cell structure according to claim 1, wherein the rod diameter of each connecting rod in the unit cell structure is d, and the rod diameters of the connecting rods in the unit cell structure are equal, and are set to be 0 < d < 0.5 Xn.
4. The three-dimensional negative poisson ratio metamaterial unit cell structure according to claim 1, wherein the distance from each concave node in the unit cell structure to the center of the unit cell structure is defined as a concave degree parameter a, and 0 < a < 0.5×n is set.
5. The three-dimensional negative poisson ratio metamaterial unit cell structure according to claim 1, wherein the unit cell structure is provided with external reinforcing rods, the external reinforcing rods are cylindrical rods with circular cross sections, each external reinforcing rod is used for being connected with concave nodes of adjacent unit cell structures, the unit cell structure provided with the external reinforcing rods is defined as an A-type reinforced unit cell structure, the length of each external reinforcing rod is La, and La = n-2 x a is set.
6. The three-dimensional negative poisson ratio metamaterial unit cell structure according to claim 1, wherein the unit cell structure is provided with inscribed reinforcing rods, each inscribed reinforcing rod is a cylindrical rod with a circular section, each inscribed reinforcing rod is used for connecting two opposite concave nodes in the same unit cell structure, the unit cell structure provided with the inscribed reinforcing rods is defined as a B-type reinforced unit cell structure, the inscribed reinforcing rods of the B-type reinforced unit cell structure are intersected at the body center of the unit cell structure, the inscribed reinforcing rods are connected in a boolean operation intersection mode, the length of each inscribed reinforcing rod is Lb, and lb=2×a is set.
7. The three-dimensional negative poisson ratio metamaterial unit cell structure according to claim 3, 5 or 6, wherein the diameter of each unit cell structure external reinforcing rod is da, the diameters of all external reinforcing rods are equal, the diameter of each unit cell structure internal reinforcing rod is db, the diameters of all internal reinforcing rods are equal, and d=da=db is set.
8. The three-dimensional negative poisson ratio metamaterial unit cell structure according to claim 7, wherein the preparation materials of the unit cell structure, the a-type reinforced unit cell structure and the B-type reinforced unit cell structure comprise but are not limited to zinc and zinc alloys.
9. An array structure applied to the three-dimensional negative poisson ratio metamaterial unit cell structure as claimed in any one of claims 1 to 4, wherein the array structure is formed by connecting peaks of the unit cell structures in an array manner.
10. A method for manufacturing a three-dimensional negative poisson ratio metamaterial unit cell and array structure according to any one of claims 1 to 9, comprising:
step S1, vibrating and screening pure Zn powder by using a 200-mesh screen to obtain powder particles with the particle size of 15-53 mu m, placing the powder particles into a vacuum drying oven, setting the drying temperature to 80 ℃, carrying out vacuum drying for 10 hours, naturally cooling to room temperature after drying, taking out the powder particles to obtain powder particles with the humidity of less than 10%, and filling the powder particles into a powder bottle of SLM equipment;
step S2, setting the temperature of a platform substrate of the SLM equipment to be a preset platform substrate temperature Tslm, setting the wind speed of a wind field to be a preset wind speed V1, setting the laser scanning power of printing boundary parameters to be a preset power W1, setting the boundary scanning speed to be a preset boundary scanning speed Vbs, setting the laser scanning power of printing parameters to be a preset scanning power Ws, setting the printing scanning speed to be a preset scanning speed Vs, and setting the layer thickness to be a preset layer thickness Dslm;
step S3, polishing and sand blasting are carried out on a Platform substrate of the SLM equipment to obtain a Platform substrate with the surface parallelism of 0.02 and the roughness of 0.8, absolute ethyl alcohol is used for cleaning the surface of a scraper bar of the SLM equipment to obtain a scraper bar with no obvious scratch on the surface, a Flood inlet and a Flood outlet of the SLM equipment are started to carry out a large amount of Gas washing, simultaneously Platform forming and Water cooling are started, after the equipment sensor shows that the oxygen content in a forming cavity is lower than 2%, gas pump and Gas control are started, and after the oxygen content is lower than 0.05%, a printing task is started;
and S4, separating the printed sample from the substrate through linear cutting, and sequentially using absolute ethyl alcohol, pickling solution and absolute ethyl alcohol for ultrasonic cleaning treatment and blow-drying the sample.
CN202310888437.2A 2023-07-19 2023-07-19 Three-dimensional negative poisson ratio metamaterial unit cell and array structure and manufacturing method thereof Pending CN116920169A (en)

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