CN110529480B - Multifunctional fastener with multiple negative poisson ratio effect and design method thereof - Google Patents
Multifunctional fastener with multiple negative poisson ratio effect and design method thereof Download PDFInfo
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- CN110529480B CN110529480B CN201910940684.6A CN201910940684A CN110529480B CN 110529480 B CN110529480 B CN 110529480B CN 201910940684 A CN201910940684 A CN 201910940684A CN 110529480 B CN110529480 B CN 110529480B
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- 230000000694 effects Effects 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005516 engineering process Methods 0.000 claims description 8
- 238000010146 3D printing Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 6
- 238000006386 neutralization reaction Methods 0.000 claims description 3
- 238000005457 optimization Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 9
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Classifications
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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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
- F16B13/06—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention discloses a multifunctional fastener with multiple negative Poisson's ratio effectThe fixing piece comprises a fixing piece top part, a fixing piece round tube part and a fixing piece tail part; the top of the fastener is provided with a plurality of uniformly distributed arc-shaped concave structures with negative poisson ratio; the outermost side of each arc-shaped concave angle is at a distance (D) 3 ‑D 2 ) And 2, the relation between the outer diameter of the circular tube and the outer diameter of the circular tube is as follows: d (D) 2 /20≤(D 3 ‑D 2 )/2≤D 2 And/8, and 2mm is less than or equal to (D) 3 ‑D 2 ) 2; the range of each arc-shaped concave angle theta is 50-70 degrees; the number N of the arc-shaped concave rod pieces at the top of the fastener 1 The method meets the following conditions: n is more than or equal to 9 1 Less than or equal to 25; the round tube part of the fastener is formed by combining an external round tube with negative Poisson's ratio and a supporting structure with negative Poisson's ratio, and the number N of the units with negative Poisson's ratio of the external round tube along the circumferential direction 2 The following should be satisfied: n (N) 2 Not less than 6 and N 2 Is even. The fastener has good fixing and anti-loosening effects.
Description
Technical Field
The invention relates to a fastener with multiple negative poisson ratio characteristics of a head part and a tubular part generated by utilizing a negative poisson ratio structure, and provides a design method of the fastener with multiple negative poisson ratio effect, belonging to the field of new materials and new structures.
Background
Poisson's ratio, also known as the lateral deformation coefficient, is a parameter that characterizes a material's lateral deformation when it is axially stressed. Materials commonly found in life all have a positive poisson's ratio, i.e. expand laterally when under pressure and contract laterally when in tension. In contrast, a material having a negative poisson's ratio is also referred to as an auxetic material because it contracts laterally when compressed and expands laterally when pulled. The negative poisson ratio material is more excellent than the traditional positive poisson ratio material in certain mechanical properties, such as shear bearing capacity, fracture resistance, energy absorption and consumption capacity, dent resistance and the like. Therefore, the negative poisson ratio material has a very wide application prospect, and is particularly combined with the traditional industrial design, thereby being beneficial to bringing about industrial design and industrial innovation.
Negative poisson's ratio materials often have porous microstructures and require greater precision in manufacturing. Conventional manufacturing techniques have difficulty achieving their accuracy and complexity. The 3D printing technology, which is also called additive manufacturing technology, gets rid of the limitation of the traditional manufacturing technology on the complex structure manufacturing technology, and can print various materials with complex and changeable shapes. Therefore, the combination of complex and changeable multiple negative poisson ratio structures and advanced 3D printing technology can produce negative poisson ratio industrial products with practical application value.
According to the application, the negative poisson ratio structure of each component of the fastener is combined and designed, and the 3D printing manufacturing process is introduced into the manufacturing of complex and changeable negative poisson ratio fasteners, so that the integrated forming of the complex fasteners can be realized. Because of the design of the concave angle in the head part, the head part of the fastener is integrally contracted when being pushed in, so that the tip part is easy to push in; and when the fastener is pulled out, the resistance of the head and the friction generated by the expansion deformation of the tubular part effectively prevent the fastener from sliding outwards. Therefore, the fastener has the advantages of reasonable structural design, convenient manufacture, portability, beautiful appearance and material saving, and has important engineering significance and certain application value.
Disclosure of Invention
In order to improve the design of the existing fastener, the invention aims to provide an integrated fastener which is reasonable in structural design, easier to push in, harder to pull out, better in anti-loosening effect, lower in manufacturing cost, lighter and more attractive and a design method thereof.
The invention adopts the technical scheme that: a multifunctional fastener with multiple negative Poisson ratio effect comprises a fastener top, a fastener round tube part and a fastener tail;
the top of the fastener is provided with a plurality of uniformly distributed arc-shaped concave structures with negative poisson ratio, so that the fastener can be ensured to be uniformly contracted laterally when the head is extruded, and the fastener can be easily pushed in;
the outermost side of each arc-shaped concave angle is at a distance D from the neutralization axis 3 The outer diameter of the round tube part is D 2 The outermost side of each arc-shaped concave angle is at a distance (D) 3 -D 2 ) And 2, the relation between the outer diameter of the circular tube part and the outer diameter of the circular tube part is as follows: d (D) 2 /20≤(D 3 -D 2 )/2≤D 2 And/8, and 2mm is less than or equal to (D) 3 -D 2 ) 2; the distributed arc structure at the top ensures the negative poisson ratio characteristic of the head, and the range of the concave angle theta in each arc is50°～70°；
The number N of the arc-shaped concave rod pieces at the top of the fastener 1 The method meets the following conditions: n is more than or equal to 9 1 ≤25；
The fastener round tube part is formed by combining an external round tube with negative poisson ratio and a supporting structure with negative poisson ratio, and under the action of axial force, the tubular structure and the supporting structure can be expanded and compressed, and the round tube and the supporting structure can be combined and deformed to generate huge negative poisson ratio characteristics; in order to ensure the integral deformation and the deformation uniformity, the number N of the negative Poisson's ratio units of the outer circular tube along the circumferential direction 2 The following should be satisfied: n (N) 2 Not less than 6 and N 2 Is an even number;
in order for the support to deform cooperatively with the outer tubular without affecting the overall deformation of the outer tubular, the support structure should be bonded to the junction of adjacent cells of the tubular along the perimeter. The number N of the negative poisson ratio units of the outer circular tube along the circumferential direction 2 The relation between the included angle alpha and the adjacent units in the supporting structure is as follows: α=360°/N 2 ；
Thickness D of the outer tube and the support structure for ensuring rigidity and deformation characteristics of the tube portion 2 /2-R 1 The following should be satisfied: d (D) 2 /16≤D 2 /2-R 1 ≤D 2 /8，R 1 Is the inner diameter of the circular tube part;
the fastener top length L 1 Length L of round tube part of fastener 2 The relationship between them satisfies: l is more than or equal to 0.8 2 /L 1 ≤2.5；
Diameter D of functional portion of the fastener tail 1 With the outer diameter D of the round tube part of the fastener 2 The relation of (2) is as follows: d is more than or equal to 1.1 1 /D 2 ；
Diameter D of functional portion of the fastener tail 1 Length L of functional portion with tail of fastener 3 The relation of (2) is as follows: d is more than or equal to 3.5 1 /L 3 ≤10.3。
Preferably, the negative poisson ratio structures of the outer circular tube and the inner support can be replaced, and the negative poisson ratio structures of the outer circular tube and the support structure can be concave hexagon structures, concave triangle structures, chiral structures, rotary polygon structures and other negative poisson ratio structures.
Preferably, the functional part of the tail part of the fastener can be designed into a disc, a round hook shape, a bayonet shape, a groove shape and the like according to the specific application of the fastener.
The concave rod piece of the fastener can expand after entering the preset hole, the outermost side of the concave angle of the top of the fastener can expand to the outer side of the hole when the fastener is pulled, the pulling-out of the fastener can be hindered when the fastener is pulled, and meanwhile, the friction force between the tubular structure and the hole is further increased by pulling and expanding, so that the fastener is difficult to pull out.
The design method of the multifunctional fastener with the multiple negative poisson ratio effect comprises the following steps:
1) Determining the basic dimensions of the top of the fastener according to the application of the fastener and the size of the pushing hole, wherein the basic dimensions comprise the concave angle, the distribution number and the distribution angle of the concave structures of the top of the fastener;
2) Designing the length of the round pipe part and the outer diameter of the round pipe of the fastener according to the use requirement;
3) The detail size combination design and optimization are carried out on the top part of the fastener and the round tube part of the fastener according to the determined size so as to ensure the deformation characteristic, the negative poisson ratio characteristic and the enough strength of the fastener;
4) Then designing a functional part of the tail part of the fastener according to the use requirement of the fastener;
5) A fastener with a heavy poisson's ratio effect is manufactured by adopting a 3D printing technology.
The invention has the beneficial effects that: the fastener designed by the method has a larger negative poisson ratio effect and can simultaneously show the negative poisson ratio effect under axial compression and extension. The negative poisson ratio design of the head part not only ensures that the fastener is easy to push in and the expansion of the fastener after entering the hole is larger than the preset cavity, but also can well prevent the pulling out and natural loosening of the fastener, and the double negative poisson ratio structure of the tubular part expands when being pulled to further prevent the pulling out of the fastener. The functional design part of the tail part can be designed differently according to the purpose of the fastener, so that the functional diversity of the tail part is ensured. The fastener designed by the method has reasonable structure, attractive appearance, portability, material saving, integrated molding and good practical application value and scientific significance.
Drawings
FIG. 1 is a schematic diagram of a fastener structure for multiple negative Poisson's ratio effects;
fig. 2 is a side view of fig. 1.
FIG. 3 is a schematic view of a single arcuate configuration of the top of the fastener;
FIG. 4 is a structural view of a double-duty Poisson's ratio structure of a fastener tubular portion;
fig. 5 is a schematic view of the structure of the outer circular tube of the fastener.
Detailed Description
The invention is further described below with reference to specific embodiments and the accompanying drawings:
as shown in fig. 1-5, a multifunctional fastener with multiple negative poisson's ratio effect comprises a fastener top 1, a fastener round tube portion 2 and a fastener tail 3;
the top 1 of the fastener is of a plurality of uniformly distributed arc-shaped concave structures with negative poisson ratio; the outermost side of each arc-shaped concave angle is at a distance D from the neutralization axis 3 The outer diameter of the round tube part is D 2 The outermost side of each arc-shaped concave angle is at a distance (D) 3 -D 2 ) And 2, the relation between the outer diameter of the circular tube part and the outer diameter of the circular tube part is as follows: d (D) 2 /20≤(D 3 -D 2 )/2≤D 2 And/8, and 2mm is less than or equal to (D) 3 -D 2 ) 2; the range of each arc-shaped concave angle theta is 50-70 degrees;
the number N of the arc-shaped concave rod pieces at the top 1 of the fastener 1 The method meets the following conditions: n is more than or equal to 9 1 ≤25；
The fastener round tube part 2 is formed by combining an external round tube with negative poisson ratio and a supporting structure with negative poisson ratio, and the number N of the external round tube with negative poisson ratio units along the circumferential direction 2 The following should be satisfied: n (N) 2 Not less than 6 and N 2 Is an even number;
the number N of the negative poisson ratio units of the outer circular tube along the circumferential direction 2 Relationship with angle alpha between adjacent units in support structureThe method meets the following conditions: α=360°/N 2 ；
Thickness D of the outer circular tube and the supporting structure 2 /2-R 1 The following should be satisfied: d (D) 2 /16≤D 2 /2-R 1 ≤D 2 /8，R 1 Is the inner diameter of the circular tube part;
length L of the fastener top 1 1 Length L of fastener round tube part 2 2 The relationship between them satisfies: l is more than or equal to 0.8 2 /L 1 ≤2.5；
Diameter D of functional portion of the fastener tail 3 1 With the outer diameter D of the round tube part 2 of the fastener 2 The relation of (2) is as follows: d is more than or equal to 1.1 1 /D 2 ；
Diameter D of functional portion of the fastener tail 3 1 Length L of functional portion with fastener tail 3 3 The relation of (2) is as follows: d is more than or equal to 3.5 1 /L 3 ≤10.3。
The negative poisson ratio structure of the outer circular tube and the supporting structure is a concave hexagon, a concave triangle, a chiral structure or a rotary polygon structure. The functional part of the fastener tail 3 is designed into a disc shape, a round hook shape, a bayonet shape or a groove shape.
The design method of the multifunctional fastener with the multiple negative poisson ratio effect comprises the following steps:
1) Determining the basic dimensions of the top of the fastener according to the application of the fastener and the size of the pushing hole, wherein the basic dimensions comprise the concave angle, the distribution number and the distribution angle of the concave structures of the top of the fastener;
2) Designing the length of the round pipe part and the outer diameter of the round pipe of the fastener according to the use requirement;
3) The detail size combination design and optimization are carried out on the top part of the fastener and the round tube part of the fastener according to the determined size so as to ensure the deformation characteristic, the negative poisson ratio characteristic and the enough strength of the fastener;
4) Then designing a functional part of the tail part of the fastener according to the use requirement of the fastener;
5) A fastener with a heavy poisson's ratio effect is manufactured by adopting a 3D printing technology.
The key to the easy push-in and pull-out characteristics of the invention is the design of multiple negative poisson's ratio structures at the top and stem of the fastener. The concave negative poisson ratio arc structure and the distributed structural characteristics of the top part enable the top part of the fastener to be greatly integrally contracted when being axially pressed, so that the fastener is easy to push in; while the tubular portion, due to the dual negative poisson's ratio system formed by the combination of the outer and inner struts, expands upon tension to hinder the pulling out of the fastener while guaranteeing the strength of the fastener, and the fastener is capable of maintaining the negative poisson's ratio characteristics over a very large deformation range.
In addition, it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention. All equivalent or simple changes according to the principles of this patent concept are included in the scope of this patent. The components not explicitly described in this embodiment can be implemented by using the prior art.
Claims (2)
1. A multi-functional fastener having a multiple negative poisson's ratio effect, characterized by: the device comprises a fastener top, a fastener round tube part and a fastener tail;
the top of the fastener is provided with a plurality of uniformly distributed arc-shaped concave structures with negative poisson ratio; the outermost side of each arc-shaped concave angle is at a distance D from the neutralization axis 3 The outer diameter of the round tube part is D 2 The outermost side of each arc-shaped concave angle is at a distance (D) 3 -D 2 ) And 2, the relation between the outer diameter of the circular tube part and the outer diameter of the circular tube part is as follows: d (D) 2 /20≤(D 3 -D 2 )/2≤D 2 And/8, and 2mm is less than or equal to (D) 3 -D 2 ) 2; the range of the concave angle theta in each arc is 50-70 degrees;
the number N of the arc-shaped concave rod pieces at the top of the fastener 1 The method meets the following conditions: n is more than or equal to 9 1 ≤25；
The round tube part of the fastener is formed by combining an external round tube with negative Poisson's ratio and a supporting structure with negative Poisson's ratio, and the number N of the units with negative Poisson's ratio of the external round tube along the circumferential direction 2 The following should be satisfied: n (N) 2 Not less than 6 and N 2 Is an even number;
the number N of the negative poisson ratio units of the outer circular tube along the circumferential direction 2 The relation between the included angle alpha and the adjacent units in the supporting structure is as follows: α=360°/N 2 ；
Thickness D of the outer circular tube and the supporting structure 2 /2-R 1 The following should be satisfied: d (D) 2 /16≤D 2 /2-R 1 ≤D 2 /8 ，R 1 Is the inner diameter of the circular tube part;
the fastener top length L 1 Length L of round tube part of fastener 2 The relationship between them satisfies: l is more than or equal to 0.8 2 /L 1 ≤2.5；
Diameter D of functional portion of the fastener tail 1 With the outer diameter D of the round tube part of the fastener 2 The relation of (2) is as follows: d is more than or equal to 1.1 1 /D 2 ；
Diameter D of functional portion of the fastener tail 1 Length L of functional portion with tail of fastener 3 The relation of (2) is as follows: d is more than or equal to 3.5 1 /L 3 ≤10.3；
The negative poisson ratio structure of the outer circular tube and the supporting structure is a concave hexagon, a concave triangle, a chiral structure or a rotary polygon structure;
the functional part of the tail part of the fastener is designed into a disc, a round hook shape, a bayonet shape or a groove shape.
2. The method of designing a multi-functional fastener with multiple negative poisson's ratio effects of claim 1, wherein: the method comprises the following steps:
1) Determining the basic dimensions of the top of the fastener according to the application of the fastener and the size of the pushing hole, wherein the basic dimensions comprise the concave angle, the distribution number and the distribution angle of the concave structures of the top of the fastener;
2) Designing the length of the round pipe part and the outer diameter of the round pipe of the fastener according to the use requirement;
3) The detail size combination design and optimization are carried out on the top part of the fastener and the round tube part of the fastener according to the determined size so as to ensure the deformation characteristic, the negative poisson ratio characteristic and the enough strength of the fastener;
4) Then designing a functional part of the tail part of the fastener according to the use requirement of the fastener;
5) A fastener with a heavy poisson's ratio effect is manufactured by adopting a 3D printing technology.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910940684.6A CN110529480B (en) | 2019-09-30 | 2019-09-30 | Multifunctional fastener with multiple negative poisson ratio effect and design method thereof |
| AU2019468312A AU2019468312B2 (en) | 2019-09-30 | 2019-12-24 | Multifunctional fastener having multiple negative Poission's ratio effects and design method therefor |
| PCT/CN2019/127881 WO2021062954A1 (en) | 2019-09-30 | 2019-12-24 | Multifunctional fastener having multiple negative poisson's ratio effects and design method therefor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910940684.6A CN110529480B (en) | 2019-09-30 | 2019-09-30 | Multifunctional fastener with multiple negative poisson ratio effect and design method thereof |
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| CN110529480A CN110529480A (en) | 2019-12-03 |
| CN110529480B true CN110529480B (en) | 2024-02-27 |
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| CN201910940684.6A Active CN110529480B (en) | 2019-09-30 | 2019-09-30 | Multifunctional fastener with multiple negative poisson ratio effect and design method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN110529480B (en) |
| AU (1) | AU2019468312B2 (en) |
| WO (1) | WO2021062954A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110529480B (en) * | 2019-09-30 | 2024-02-27 | 南京工业大学 | Multifunctional fastener with multiple negative poisson ratio effect and design method thereof |
| CN113369476B (en) * | 2021-05-31 | 2022-08-02 | 西北有色金属研究院 | Preparation process of metal fiber porous material with three-dimensional positive and negative Poisson's ratio |
| CN113333750B (en) * | 2021-05-31 | 2022-08-02 | 西北有色金属研究院 | Preparation process of metal fiber porous material with three-dimensional negative Poisson's ratio |
| US11771183B2 (en) | 2021-12-16 | 2023-10-03 | Joon Bu Park | Negative Poisson's ratio materials for fasteners |
| CN114483852B (en) * | 2021-12-21 | 2024-01-30 | 东南大学 | Negative poisson ratio vibration reduction structure with adjustable rigidity |
| CN114535666A (en) * | 2022-02-28 | 2022-05-27 | 广州大学 | Bionic negative Poisson's ratio drill bit and design method thereof |
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| JP2003042110A (en) * | 2001-07-27 | 2003-02-13 | Meiji Univ | Fastening structure |
| CN202450745U (en) * | 2012-02-21 | 2012-09-26 | 余姚市力捷五金工业有限公司 | New hollow expansion fastener |
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| CN109210054A (en) * | 2018-10-23 | 2019-01-15 | 南京工业大学 | Nail with negative Poisson ratio effect and design method thereof |
| CN210660921U (en) * | 2019-09-30 | 2020-06-02 | 南京工业大学 | Multifunctional fastener with multiple negative Poisson's ratio effect |
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| US20050079033A1 (en) * | 2003-10-09 | 2005-04-14 | Benedetti Steven Michael | Arcuate-hinge fastener |
| DE102014214419A1 (en) * | 2014-07-23 | 2016-01-28 | Bayerische Motoren Werke Aktiengesellschaft | Connecting element and device with connecting element |
| CN106545554B (en) * | 2017-01-20 | 2020-02-04 | 深圳宁泉科技有限公司 | Expansion fixed connection module system |
| EP3501457A1 (en) * | 2017-12-20 | 2019-06-26 | Materialise N.V. | Flexible porous implant fixation system |
| CN109171921B (en) * | 2018-10-16 | 2021-02-09 | 北京航空航天大学 | Novel design and manufacture of bone nail easy to screw in |
| CN109538596A (en) * | 2018-11-22 | 2019-03-29 | 北京理工大学 | A kind of nail with negative poisson's ratio characteristic |
| CN110529480B (en) * | 2019-09-30 | 2024-02-27 | 南京工业大学 | Multifunctional fastener with multiple negative poisson ratio effect and design method thereof |
-
2019
- 2019-09-30 CN CN201910940684.6A patent/CN110529480B/en active Active
- 2019-12-24 AU AU2019468312A patent/AU2019468312B2/en not_active Ceased
- 2019-12-24 WO PCT/CN2019/127881 patent/WO2021062954A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003042110A (en) * | 2001-07-27 | 2003-02-13 | Meiji Univ | Fastening structure |
| CN202450745U (en) * | 2012-02-21 | 2012-09-26 | 余姚市力捷五金工业有限公司 | New hollow expansion fastener |
| CN206972714U (en) * | 2017-07-31 | 2018-02-06 | 东方蓝天钛金科技有限公司 | A kind of anti-loose fastener |
| CN109210054A (en) * | 2018-10-23 | 2019-01-15 | 南京工业大学 | Nail with negative Poisson ratio effect and design method thereof |
| CN210660921U (en) * | 2019-09-30 | 2020-06-02 | 南京工业大学 | Multifunctional fastener with multiple negative Poisson's ratio effect |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2019468312B2 (en) | 2023-03-16 |
| AU2019468312A1 (en) | 2021-05-06 |
| CN110529480A (en) | 2019-12-03 |
| WO2021062954A1 (en) | 2021-04-08 |
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