CN109210054A - A kind of nail and its design method with Negative poisson's ratio - Google Patents
A kind of nail and its design method with Negative poisson's ratio Download PDFInfo
- Publication number
- CN109210054A CN109210054A CN201811234175.3A CN201811234175A CN109210054A CN 109210054 A CN109210054 A CN 109210054A CN 201811234175 A CN201811234175 A CN 201811234175A CN 109210054 A CN109210054 A CN 109210054A
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- nail
- negative poisson
- ratio
- shank
- round tube
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- 238000013461 design Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 21
- 241000587161 Gomphocarpus Species 0.000 claims abstract description 10
- 230000006835 compression Effects 0.000 claims abstract description 5
- 238000007906 compression Methods 0.000 claims abstract description 5
- 238000007639 printing Methods 0.000 claims abstract 2
- 238000005516 engineering process Methods 0.000 claims description 5
- 238000010146 3D printing Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 19
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Classifications
-
- 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
- F16B15/00—Nails; Staples
Abstract
The invention discloses a kind of nail and its design method with Negative poisson's ratio, the matched design on head, bar portion and tail portion including nail.Negative poisson's ratio nail compression bar portion when squeezing into attenuates and is easier to squeeze into, and tension is thicker when extracted is not drawn out easily, and has more durability and practicability than common nails.Brief operation step are as follows: firstly, 3D printer used by determining is capable of the minimum dimension of precise Printing；Then, the hole distribution for designing nail shank tubular structure, makes the tubular structure have Negative poisson's ratio, when design should be noted that nail the size of each part is no less than the minimum dimension that 3D printer can print；The nail head and tail portion that further design matches with tubular structure, complete the whole design of negative Poisson nail, using the designed nail of 3D printing technique production.The nail that the method for the present invention is designed is proved to have very strong novelty and practicability.
Description
Technical field
The present invention relates to a kind of by designing the nail designed with negative poisson's ratio tubular structure with Negative poisson's ratio
Son, and the design method of negative poisson's ratio nail is proposed, belong to new material and new construction field.
Background technique
Negative poisson's ratio material and structure have unusual mechanical characteristic, different from the swollen pulling-down of the pressure of traditional material, bear
Under uniaxial tension (pulling force) effect cross-direction shrinkage (expansion) occurs for Poisson ratio material.Negative poisson's ratio material has many ideal special
Property, in terms of shear-carrying capacity, break resistance, energy-absorbing energy-dissipating ability, dent resistance advantageously than traditional material.Just
It is due to these excellent performances, negative poisson's ratio material is in Medical Devices, sensor, safeguard, aviation and navigation and national defence work
The fields such as journey have more and more wide application prospect.In recent years, more and more researchers join in the production of negative poisson's ratio correlation
In the design and research and development of product.
The development of negative poisson's ratio material is more than 30 years existing, achieves many achievements.But most of existing literatures are still
Or it is studied based on two-dimensional negative poisson's ratio material.Three-dimensional negative poisson's ratio material is mostly the porous structure of internal structure complexity, by
In the backwardness of past manufacturing technology, it is seldom really to apply to actual three-dimensional negative poisson's ratio material.3D printing technique, also referred to as
Increases material manufacturing technology, its appearance very good solution this problem, technique are also considered as the third time industrial revolution
Mark.Using this new technology, complex-shaped three-dimensional negative poisson's ratio material and structure can be printed.It designed and manufactured in the past
Negative poisson's ratio material substrate is mostly rubber, and bearing capacity and impact resistance are weaker.Metal Meta Materials mechanical property is generally all
It is better than elastomer Meta Materials.By with more preferable mechanical property 3-dimensional metal negative poisson's ratio material and advanced 3D printing technique phase
In conjunction with the negative poisson's ratio product with practical application value is produced, there is realistic meaning.
Negative poisson's ratio fastener is that metal negative poisson's ratio material is applied to an actual thinking, is drawn according to negative poisson's ratio
The characteristic of swelling pressure contracting, Choi take the lead in proposing to have using fastener made of negative poisson's ratio material being easier to beat than conventional fastener
Enter the characteristic for being more difficult to extract.It is inspired by this, inventor proposes the imagination of negative poisson's ratio nail.When it attenuates when knocking in and is extracted
It is thicker, as shown in Figure 1.The present invention combines negative poisson's ratio tubular structure and 3D printing manufacturing process, designs and makes and is first
Nail with Negative poisson's ratio can show negative poisson's ratio characteristic under big tensile and compressible strain.With tradition
Screw is compared, and negative poisson's ratio nail is easier to construction and more durable, with very important scientific meaning and certain applies valence
Value.
Summary of the invention
The purpose of the present invention is in view of the deficiencies of the prior art, structure optimization and 3D printing technique are combined, design and
The negative poisson's ratio nail of tool practicability has been manufactured, and has proposed specific design method, the nail of design has more than traditional nail
Good easy push-in and resistance to pull out energy.
The technical solution adopted by the present invention are as follows: a kind of nail with Negative poisson's ratio, including nail head, nail shank
The design of the negative poisson's ratio of portion and nail tail portion and matched design.
The nail shank is the tubular structure with periodically vertical and horizontal alternate hole.
The nail head is cylinder, thickness h and body diameter D1Relationship meet: 5.5 > D1/ h > 2.
The round tube outer diameter D of the nail shank2With head diameter D1Relationship meet: 3 > D1/D2> 1.6.
The nail shank round tube length L and round tube outer diameter D2Relationship meet: 8 > L/D2> 1.5.
The circular tube thickness of the nail shank/round tube length > 0.05.
The cone structure section side length of the nail tail portion and the angle theta of nail central axes meet: 32 ° >=θ >=15 °.
Preferably, the nail shank meets: 0.15 > circular tube thickness/round tube length > 0.08.
Preferably, described hole structure includes ellipse, triangle and polygon.
A kind of design method of above-mentioned nail with Negative poisson's ratio, comprising the following steps:
1) shape and size for determining each component part of nail, including nail overall length, the shape and size of nail head, nail
Length and diameter, the angle of nail tail portion in sub bar portion；
2) that designs nail shank has the tubular structure of periodically vertical and horizontal alternate hole, and make nail shank full
In the case that sufficient 3D printing requires, the spacing in bar portion gap is small as far as possible；
3) nail with Negative poisson's ratio is produced using 3D metallic print technology, which has high compressive strength
With lower tensile strength, meet the demand of actual use；
4) there is Negative poisson's ratio with the round tube of the method nail shank generated when being uniaxially stretched, to make
The round tube designed by this method also has Negative poisson's ratio in the case of uniaxial compression, and the thickness of round tube is needed more than one
Fixed critical value needs to meet: circular tube thickness/round tube length > 0.05.
Its key for generating Negative poisson's ratio of the present invention is the design of the negative poisson's ratio tubular structure of nail shank.?
In the case where meeting 3D printing production requirement, guarantees that vertical and horizontal alternate cavernous structure is sufficiently small, there is the bar portion round tube of nail
Negative poisson's ratio, so that nail is whole also to have Negative poisson's ratio.Have by the nail that this method can be designed
Apparent Negative poisson's ratio, while negative poisson's ratio performance can be maintained in big range of strain.In addition, designed negative Poisson
Negative poisson's ratio performance can not only be shown under axial tension than nail, while negative pool can be also showed in the case where being compressed axially
Pine compares performance.
Beneficial effects of the present invention: the nail designed using this method is had biggish Negative poisson's ratio and can be simultaneously
Negative poisson's ratio is shown in the case where being compressed axially and stretching, is more easier when squeezing into than traditional nail, and is had secured
The characteristics of not being drawn out easily.Since the axial push-in pressure that practical nail is subject to when in use is often greater than axial extraction pulling force, this hair
The nail of bright design has the characteristics that big compression strength and low tensile strength, better adapts to the demand of practical application.
Detailed description of the invention
Fig. 1 a is the nail construction schematic diagram with Negative poisson's ratio；
Fig. 1 b is the cross-sectional view of Fig. 1 a.
Fig. 2 is the nail effect picture with Negative poisson's ratio；
Fig. 2 b is the side view of Fig. 2 a；
Fig. 2 c is the sectional view of Fig. 2 a.
Specific embodiment
The present invention is described further with attached drawing combined with specific embodiments below:
As illustrated in fig. 1 and 2, a kind of nail with Negative poisson's ratio, including nail head 1, nail shank 2 and nail
Tail portion 3；
The thickness h and body diameter D of the nail head 11Meet: 5.5 > D1/ h > 2；
The round tube outer diameter D of the nail shank2With head diameter D1Meet: 3 > D1/D2> 1.6；
The nail shank round tube length L and round tube outer diameter D2Meet: 8 > L/D2> 1.5；
The nail shank 2 is the tubular structure with periodically vertical and horizontal alternate hole；
The nail shank 2 meets: 0.15 > circular tube thickness/round tube length > 0.08；
The nail tail portion 3 meets: 32 ° >=θ >=15 °；
A kind of design detailed step of above-mentioned nail with Negative poisson's ratio are as follows:
1, the shape and size of each component part of nail are determined；
Depending on the application, determine that the nail of design respectively forms size, as nail overall length H, nail head design (diameter D1, thickness
Degree h), nail shank design (length L, outer diameter D 2, thickness T) and nail shank angle at the end, as shown in Figure 1.
2, the nail shank that there is the period to replace hole anyhow for design, cavernous structure include: 1. oval (such as Fig. 2 institute
Show)；2. triangle；3. polygon.In the case where nail shank meets 3D printing requirement, minimize between bar portion hole
Away from；
3, the designed nail with Negative poisson's ratio is generated using 3D printing technique.
4, designed negative poisson's ratio nail can not only show negative poisson's ratio performance under axial tension, while in axial direction
Also negative poisson's ratio performance can be showed in the case where compression, nail shank needs to meet: circular tube thickness/round tube length > 0.05.
It should be pointed out that for those skilled in the art, without departing from the principle of the present invention,
Several improvements and modifications can also be made, these modifications and embellishments should also be considered as the scope of protection of the present invention.In the present embodiment not
The available prior art of specific each component part is realized.
Claims (4)
1. a kind of nail with Negative poisson's ratio, it is characterised in that: including nail head, nail shank and nail tail portion,
There is matched design below between above-mentioned each component:
The nail shank is the tubular structure with periodically vertical and horizontal alternate hole；
The nail head is cylinder, the relationship satisfaction of thickness h and body diameter D1: 5.5 > D1/h > 2；
The round tube outer diameter D 2 of the nail shank and the relationship of head diameter D1 meet: 3 > D1/D2 > 1.6；
The relationship of the nail shank round tube length L and round tube outer diameter D 2 meets: 8 > L/D2 > 1.5；
The circular tube thickness of the nail shank/round tube length > 0.05；
The cone structure section side length of the nail tail portion and the angle theta of nail central axes meet: 32 ° >=θ >=15 °.
2. a kind of nail with Negative poisson's ratio according to claim 1, it is characterised in that: the nail shank is full
Foot: 0.15 > circular tube thickness/round tube length > 0.08.
3. a kind of nail with Negative poisson's ratio according to claim 1, it is characterised in that: described hole structure packet
Include ellipse, triangle and polygon.
4. a kind of design method of nail with Negative poisson's ratio according to claim 1,2 or 3, feature exist
In: the following steps are included:
1) shape and size for determining each component part of nail, including nail overall length, the shape and size of nail head, nail shank
Length and diameter, the angle of nail tail portion in portion；
2) that designs nail shank has the tubular structure of periodically vertical and horizontal alternate hole, and make nail shank is meeting 3D
In the case that printing requires, the spacing in bar portion gap is small as far as possible；
3) nail with Negative poisson's ratio is produced using 3D metallic print technology, the nail have high compressive strength and compared with
Low tensile strength meets the demand of actual use；
4) there is Negative poisson's ratio with the round tube of the method nail shank generated when being uniaxially stretched, to make to pass through
The round tube of this method design also has Negative poisson's ratio in the case of uniaxial compression, and the thickness of round tube needs to be more than certain
Critical value needs to meet: circular tube thickness/round tube length > 0.05.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811234175.3A CN109210054A (en) | 2018-10-23 | 2018-10-23 | A kind of nail and its design method with Negative poisson's ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811234175.3A CN109210054A (en) | 2018-10-23 | 2018-10-23 | A kind of nail and its design method with Negative poisson's ratio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109210054A true CN109210054A (en) | 2019-01-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811234175.3A Pending CN109210054A (en) | 2018-10-23 | 2018-10-23 | A kind of nail and its design method with Negative poisson's ratio |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109210054A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854575A (en) * | 2019-04-02 | 2019-06-07 | 南京工业大学 | A kind of connector and its design method with Negative poisson's ratio |
| CN110529480A (en) * | 2019-09-30 | 2019-12-03 | 南京工业大学 | A kind of multifunctional fastener and its design method with multiple Negative poisson's ratio |
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| US20160025343A1 (en) * | 2013-03-15 | 2016-01-28 | President And Fellows Of Harvard College | Void structures with repeating elongated-aperture pattern |
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| CN107981926A (en) * | 2017-09-20 | 2018-05-04 | 北京航空航天大学 | The new resistance to plucking based on increases material manufacturing technology goes out pedicle nail |
| CN108642640A (en) * | 2018-05-03 | 2018-10-12 | 东华大学 | A kind of preparation method and purposes of rigidity gradient auxetic materials |
| CN209262008U (en) * | 2018-10-23 | 2019-08-16 | 南京工业大学 | A kind of nail with Negative poisson's ratio |
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2018
- 2018-10-23 CN CN201811234175.3A patent/CN109210054A/en active Pending
Patent Citations (5)
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| US20160025343A1 (en) * | 2013-03-15 | 2016-01-28 | President And Fellows Of Harvard College | Void structures with repeating elongated-aperture pattern |
| CN107898495A (en) * | 2017-07-24 | 2018-04-13 | 北京航空航天大学 | New resistance to plucking with auxetic performance goes out nail |
| CN107981926A (en) * | 2017-09-20 | 2018-05-04 | 北京航空航天大学 | The new resistance to plucking based on increases material manufacturing technology goes out pedicle nail |
| CN108642640A (en) * | 2018-05-03 | 2018-10-12 | 东华大学 | A kind of preparation method and purposes of rigidity gradient auxetic materials |
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|---|
| XIN REN, AUXETIC NAIL: DESIGN AND EXPERIMENTAL STUDY, 14 October 2017 (2017-10-14), pages 288 - 298 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854575A (en) * | 2019-04-02 | 2019-06-07 | 南京工业大学 | A kind of connector and its design method with Negative poisson's ratio |
| CN110529480A (en) * | 2019-09-30 | 2019-12-03 | 南京工业大学 | A kind of multifunctional fastener and its design method with multiple Negative poisson's ratio |
| WO2021062954A1 (en) * | 2019-09-30 | 2021-04-08 | 南京工业大学 | Multifunctional fastener having multiple negative poisson's ratio effects and design method therefor |
| AU2019468312B2 (en) * | 2019-09-30 | 2023-03-16 | Nanjing Tech University | Multifunctional fastener having multiple negative Poission's ratio effects and design method therefor |
| 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 |
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