CN209743308U - Connecting piece with negative Poisson ratio effect - Google Patents
Connecting piece with negative Poisson ratio effect Download PDFInfo
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- CN209743308U CN209743308U CN201920440429.0U CN201920440429U CN209743308U CN 209743308 U CN209743308 U CN 209743308U CN 201920440429 U CN201920440429 U CN 201920440429U CN 209743308 U CN209743308 U CN 209743308U
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- outer tube
- connecting piece
- outer pipe
- tubular structure
- inner cylinder
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- 230000000694 effects Effects 0.000 title claims abstract description 18
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 15
- 238000013461 design Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010146 3D printing Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002547 anomalous effect Effects 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
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- Mutual Connection Of Rods And Tubes (AREA)
Abstract
the utility model discloses a connecting piece with negative poisson's ratio effect, this connecting piece have the tubular structure outer tube that negative poisson's ratio effect key lies in its peripheral parcel, two ring structure and the inside cylinder that meet with the outer tube. The outer pipe and the inner cylinder of the connecting piece are respectively fixed on two parts to be connected, pressure is applied to two annular structures on the outer pipe of the connecting piece, the outer pipe can contract inwards, and the friction force between the inner wall of the outer pipe and the surface of the inner cylinder is increased, so that the outer pipe and the inner cylinder are connected and fixed; on the contrary, the two annular structures on the outer pipe of the connecting piece are exerted with pulling force, the outer pipe expands outwards, and the outer pipe is separated from the inner cylinder. The utility model discloses a connecting piece is very novel, can use in many places, like cap for a brush, bowl cover and rope both ends etc. has very big commercial value.
Description
Technical Field
the utility model relates to an utilize special tubular structure to design the connecting piece that has negative poisson's ratio effect belongs to new material and new construction field.
Background
The concept of Poisson's ratio was first proposed by the french famous mathematician Poisson (Simon Denis Poisson, 1781-. Most conventional materials have a positive poisson's ratio, but with the development of the classical theory of elasticity, one gradually realizes that the elastic deformation of isotropic materials can be expressed in two independent parameters: modulus of elasticity and poisson's ratio, and poisson's ratio varies greatly between different materials. At present, classical theory of elasticity proves that the poisson ratio value range of the isotropic material is-1.0-0.5. When the poisson's ratio is negative, the material may exhibit anomalous characteristics different from conventional materials, for example, a negative poisson's ratio material may expand in the longitudinal direction when subjected to a tensile load in the transverse direction. The earliest reports on negative poisson's ratio materials appeared in the early 20 th century, and chemists discovered that certain substances in nature, such as pyrite, arsenic, cadmium, ferromagnetic films, and FCC crystals, would exhibit negative poisson's ratio effects. Likewise, the negative poisson's ratio effect can also find evidence in biological tissues, such as the partial skin of cow teats. In the 80 s of the 20 th century, a large amount of artificial negative poisson's ratio materials emerged. In 1987, Lakes first obtained a negative Poisson's ratio foam by heat treating a polyurethane foam and measured the Poisson's ratio to be-0.7. In 1989, Evans et al also achieved the negative Poisson's ratio effect in the preparation of polytetrafluoroethylene having a microporous structure and named it as an Auxetic material. Compared with the traditional positive poisson ratio material, the negative poisson ratio material has some special properties, particularly in the aspects of elastic modulus, shear modulus, indentation resistance, energy absorption and the like. Therefore, the negative Poisson ratio material has great application prospect in many fields.
The connecting piece is a connecting part. There are many ways of connecting, roughly divided into rigid and hinged connections. By rigid connection is meant that the connected objects are neither relatively movable nor relatively rotatable, whereas the hinged objects are relatively rotatable.
SUMMERY OF THE UTILITY MODEL
the utility model aims at overcoming the not enough of prior art, in introducing the connecting piece with negative poisson ratio material and having designed just connecting in a new connected mode, utilize the compression characteristic of negative poisson ratio tubular structure to retrain the component promptly. The connecting piece has the characteristics of novel connecting method, simplicity in operation, attractive appearance and the like, and has great commercial prospect.
the utility model adopts the technical proposal that: a connecting piece with a negative Poisson ratio effect is a connecting piece with a negative Poisson ratio effect, the periphery of the connecting piece is wrapped by an outer tube of a tubular structure, the surface of the outer tube of the tubular structure is of a periodically arranged hole structure, and the surface of the outer tube of the tubular structure is matched with two annular structures and an inner cylinder which are connected with the outer tube;
the structural shape of the hole on the tubular structure outer tube comprises an ellipse, a triangle and a polygon;
The diameter D1 of the outer tube of the tubular structure and the diameter D2 of the inner cylinder satisfy the relationship: D1/D2 is more than 1 and less than 1.1;
the outer diameter D of the annular structure and the diameter D1 of the outer tube of the tubular structure satisfy the relation: D/D1 is more than 1 and less than 1.5;
the tubular structure outer tube length H and the inner cylinder length L satisfy the relationship: H/L is more than 0.5 and less than 2;
The outer tube thickness and the outer tube length of the outer tube wall of the connecting piece satisfy the relationship: 0.20 > outer tube thickness/outer tube length > 0.08.
the design method of the connecting piece with the negative Poisson ratio effect comprises the following steps:
1) according to the actual use condition, determining the sizes of all components of the connecting piece, including the shapes and the sizes of the outer pipe and the inner cylinder of the tubular structure;
2) Designing the distribution, shape and size of the tubular structure outer pipe with a periodically alternating hole structure;
3) The outer tube with the tubular structure is prepared by adopting a 3D printing technology according to the design, the connecting method of the connecting piece is novel and simple to operate, and the actual use requirement is met;
4) and manufacturing and processing the two annular structures and the inner cylinder according to the actual use condition, and connecting the annular structures and the tubular structure outer pipe to complete the overall design of the connecting piece.
The utility model discloses have the tubular structure outer tube that negative poisson ratio effect key lies in its periphery parcel, two ring structure and the inside cylinder that meet with the outer tube. The outer pipe and the inner cylinder of the connecting piece are respectively fixed on two parts to be connected, pressure is applied to two annular structures on the outer pipe of the connecting piece, the outer pipe can contract inwards, and the friction force between the inner wall of the outer pipe and the surface of the inner cylinder is increased, so that the outer pipe and the inner cylinder are connected and fixed; on the contrary, the outer tube is expanded outwards by applying a pulling force to the two ring structures on the outer tube of the connector, so that the outer tube is separated from the inner cylinder. The utility model discloses a connecting piece is very novel, can use in many places, for example cap for a brush, bowl cover and rope both ends etc. have very big commercial value.
has the advantages that: the utility model discloses be different from traditional connecting piece, utilize the connecting piece of this method design to have connection method novelty, easy operation and characteristics such as handsome in appearance. The connecting piece has an obvious negative Poisson ratio effect, can be well matched with the constraint and fixation effect of the connecting piece, and better adapts to actual use requirements.
Drawings
FIG. 1 is a schematic view of the tubular outer tube and two ring structures of the present invention;
FIG. 2 is a schematic view of the inner cylinder of the present invention;
FIG. 3 is a top view of FIG. 1;
Fig. 4 is a top view of fig. 2.
Detailed Description
The invention will be further explained with reference to the drawings and the detailed description below:
as shown in fig. 1-4, a connecting piece with a negative poisson's ratio effect is a connecting piece with a negative poisson's ratio effect, the periphery of the connecting piece is wrapped by a tubular structure outer tube 1, the surface of the tubular structure outer tube 1 is a periodically arranged hole structure, and the connecting piece is matched with two annular structures 2 and an inner cylinder 3 which are connected with the outer tube;
The structural shape of the hole on the tubular structure outer tube 1 comprises an ellipse, a triangle and a polygon;
the diameter D1 of the tubular structure outer tube 1 and the inner cylinder 3 diameter D2 satisfy the relationship: D1/D2 is more than 1 and less than 1.1;
The outer diameter D of the ring-shaped structure 2 and the diameter D1 of the tubular structure outer tube 1 satisfy the relation: D/D1 is more than 1 and less than 1.5;
The length H of the tubular structure outer tube 1 and the length L of the inner cylinder 3 satisfy the relationship: H/L is more than 0.5 and less than 2;
the outer tube thickness and the outer tube length of the outer tube wall of the connecting piece satisfy the relationship: 0.20 > outer tube thickness/outer tube length > 0.08.
The utility model applies pressure to the two ends of the outer tube to shrink the outer tube wall, thereby increasing the friction between the inner wall of the outer tube and the surface of the inner cylinder and fixing the two parts; conversely, the two parts can be separated by applying a pulling force to the two ends of the outer tube to expand the outer tube wall outwards.
The manufacturing method of the connecting piece comprises the following steps:
1) according to the actual use condition, determining the sizes of all components of the connecting piece, such as the outer diameters D of two annular structures, the diameter D1 of the outer pipe of the tubular structure, the diameter D2 of an inner cylinder, the length H of the outer pipe of the tubular structure, the length L of the inner cylinder and the thickness of the outer pipe of the tubular structure;
2) designing the distribution, shape and size of the tubular structure outer pipe with a periodically alternating hole structure;
3) The outer tube with the tubular structure is prepared by adopting a 3D printing technology according to the design, the connecting method of the connecting piece is novel and simple to operate, and the actual use requirement is met;
4) and manufacturing and processing the two annular structures and the inner cylinder according to the actual use condition, and connecting the annular structures and the tubular structure outer pipe to complete the overall design of the connecting piece.
It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention. Components not explicitly described in this example can be implemented using existing techniques.
Claims (1)
1. A connection having a negative poisson's ratio effect, wherein: the connecting piece is a connecting piece with a negative Poisson ratio effect, the periphery of the connecting piece is wrapped by a tubular structure outer tube, the surface of the tubular structure outer tube is a periodically arranged hole structure, and the tubular structure outer tube is matched with two annular structures connected with the outer tube and an inner cylinder;
The structural shape of the hole on the tubular structure outer tube comprises an ellipse, a triangle and a polygon;
the diameter D1 of the outer tube of the tubular structure and the diameter D2 of the inner cylinder satisfy the relationship: D1/D2 is more than 1 and less than 1.1;
the outer diameter D of the annular structure and the diameter D1 of the outer tube of the tubular structure satisfy the relation: D/D1 is more than 1 and less than 1.5;
The tubular structure outer tube length H and the inner cylinder length L satisfy the relationship: H/L is more than 0.5 and less than 2;
the outer tube thickness and the outer tube length of the outer tube wall of the connecting piece satisfy the relationship: 0.20 > outer tube thickness/outer tube length > 0.08.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920440429.0U CN209743308U (en) | 2019-04-02 | 2019-04-02 | Connecting piece with negative Poisson ratio effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920440429.0U CN209743308U (en) | 2019-04-02 | 2019-04-02 | Connecting piece with negative Poisson ratio effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209743308U true CN209743308U (en) | 2019-12-06 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920440429.0U Active CN209743308U (en) | 2019-04-02 | 2019-04-02 | Connecting piece with negative Poisson ratio effect |
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| Country | Link |
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| CN (1) | CN209743308U (en) |
Cited By (1)
| 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 |
-
2019
- 2019-04-02 CN CN201920440429.0U patent/CN209743308U/en active Active
Cited By (1)
| 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 |
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