CN209654492U - The adjustable negative poisson's ratio structure of performance - Google Patents
The adjustable negative poisson's ratio structure of performance Download PDFInfo
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- CN209654492U CN209654492U CN201920222594.9U CN201920222594U CN209654492U CN 209654492 U CN209654492 U CN 209654492U CN 201920222594 U CN201920222594 U CN 201920222594U CN 209654492 U CN209654492 U CN 209654492U
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Abstract
The utility model relates to structure-design technique fields, specifically disclose a kind of adjustable negative poisson's ratio structure of performance, it is characterized in that, including multiple negative poisson's ratio units, the negative poisson's ratio unit includes four submissive curved-beam elements and four connectors, the connector is the cuboid that is square of section, four connectors are symmetrical and two adjacent connectors between by the submissive curved-beam element connection, the end of the curved beam compliance unit is connect with the end of the connector inner side edge.The utility model solves the problems, such as that negative poisson's ratio structure in the prior art single direction stress deformation and can only can not adjust structural behaviour.
Description
Technical field
The utility model relates to structure-design technique field more particularly to a kind of adjustable negative poisson's ratio structures of performance.
Background technique
Negative poisson's ratio structure is also known as auxetic structure, and structure vertical is expanded in direction of pull when showing as tension, compression
When shunk perpendicular to pressure direction, therefore, this structure has higher compression impedance, resistance to compression trace ability, shear resistance, and has
Effect reduces stress concentration phenomenon, has broad application prospects, such as the vibration-absorptive material of rocket in space industry, rocket or aircraft
Radome fairing, as resistance to plucking goes out auxetic bone nail in medical field, some bullet resistant materials etc. in military field.
The knot that existing negative poisson's ratio structure has double-head arrow type structure and classical concave inward structure to combine with double-head arrow structure
Structure can only realize single direction stress deformation, in stress although the design of these negative poisson's ratio structures has negative poisson's ratio characteristic
In more complex environment and it is not suitable for.In addition, these negative poisson's ratio structures can only change cell configuration by experience, it is whole to change
Body structural behaviour can not be calculated quantitatively.
Utility model content
The purpose of the utility model is to provide a kind of adjustable negative poisson's ratio structures of performance, in the prior art negative to overcome
Poisson's ratio structure can only single direction stress deformation and the problem of can not adjust structural behaviour.
In order to solve the above-mentioned technical problem, the utility model provides a kind of adjustable negative poisson's ratio structure of performance, including
Multiple negative poisson's ratio units, the negative poisson's ratio unit include four submissive curved-beam elements and four connectors, the connector
For the cuboid that section is square, four connectors are symmetrical and two adjacent connectors between pass through the submissive song
Beam element connection, the end of the curved beam compliance unit is connect with the end of the medial surface of the connector.
Preferably, planar periodic arrangement combines multiple negative poisson's ratio units.
Preferably, the submissive curved-beam element is generated by nurbs curve Modeling and Design.
Preferably, the ratio between the submissive curved-beam element thickness and height are 1:6.
Preferably, the ratio between the length of the connector and the side length of its square section are 4:1.
Preferably, the height of the flexible curved-beam element is equal with the side length of the square section of the connector.
Preferably, the adjustable negative poisson's ratio structure of the performance utilizes 3D printing technique, selects TPU material integration system
It makes.
The performance of the utility model adjustable negative poisson's ratio structure expands when having tension perpendicular to direction of pull, presses
The characteristic shunk when contracting perpendicular to pressure direction, the curved-beam element in negative poisson's ratio structure can be in the design process according to reality
The demand of structural behaviour carries out quantitative adjusting, has good adaptability, and the deformation having the same in plane X, Y-direction
Characteristic, this negative poisson's ratio structure all has negative poisson's ratio characteristic in plane both direction, and structure is full symmetric, in plane two
Mechanical property is identical on a direction, in specific actual application, is adapted to complex loading conditions, can be with NURBS
Curve models submissive curved beam, can quantitatively change its mechanical property by changing curved beam shape, and then change overall structure
Can, strong flexibility can satisfy the design requirement of various conditions, realize the adjustability of performance, using submissive curved-beam element, tool
Have small in concentrated stress, from fretting wear, movement is steady and the advantages that convenient for energy storage conversion, and service performance is excellent.
Detailed description of the invention
Fig. 1 is that the structure of the submissive curved-beam element for the negative poisson's ratio structure that the performance tolerance of the utility model embodiment is jumped is shown
It is intended to；
Fig. 2 is that the structure of the negative poisson's ratio unit for the negative poisson's ratio structure that the performance tolerance of the utility model embodiment is jumped is shown
It is intended to；
Fig. 3 is the structural schematic diagram for the negative poisson's ratio structure that the performance tolerance of the utility model embodiment is jumped；
Fig. 4 is the stress diagram for the negative poisson's ratio structure that the performance tolerance of the utility model embodiment is jumped.
In figure, 1: submissive curved-beam element；2: connector.
Specific embodiment
The embodiments of the present invention is described in further detail with reference to the accompanying drawings and examples.Following embodiment
For illustrating the utility model, but cannot be used to limit the scope of the utility model.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the present invention.In addition, in the description of the present invention, unless otherwise indicated, " multiples' " contains
Justice is two or more.
As shown in Figure 1-3, the adjustable negative poisson's ratio structure of the performance of the present embodiment includes: multiple negative poisson's ratio units, bear
Poisson's ratio unit includes four submissive curved-beam elements 1 and four connectors 2, and connector 2 is the cuboid that is square of section, and four
A connector 2 is symmetrical and two adjacent connectors 2 between connected by submissive curved-beam element 1, curved beam compliance unit 1
End is connect with the end of the medial surface of connector 2.Planar periodic arrangement combines multiple negative poisson's ratio units, becomes negative
Poisson's ratio structure.
Being generated by nurbs curve tectonic model shape function Modeling and Design for submissive curved-beam element 1, can sit according to control point
The shape for marking accurate description curved beam, carries out finite element solving according to shape function and obtains stiffness matrix, carries out quantitative analysis to curved beam,
Change the shape of curved beam by changing control point coordinates, and then changes its mechanical property.
The ratio between submissive 1 thickness of curved-beam element and height are 1:6, wherein with a thickness of the size of horizontal direction in plane, height
For the size of vertical direction in plane, this ratio can guarantee the nyctitropic flexibility of its planar shaped and perpendicular to plane deformation side
To rigidity.The ratio between length and the side length of its square section of connector 2 are 4:1.The height and connection of flexible curved-beam element 1
The side length of the square section of body 2 is equal.
The adjustable negative poisson's ratio structure of performance in this fact Example utilizes 3D printing technique, selects TPU material integration system
It makes.
As shown in figure 4, the working principle and the course of work of the adjustable negative poisson's ratio structure of the performance of the present embodiment are as follows: to negative
Poisson's ratio structure applies Y-direction constraint below, if applying Y-direction pressure to top, deformation occurs for the submissive curved beam of inside configuration, knot
Structure is whole to be presented contraction state in the x direction and the y direction, if applying Y-direction pulling force to top, structure is whole in X-direction and the side Y
To swelling state is presented, that is, there is negative poisson's ratio characteristic.Since structure is in full symmetric state, can also apply in X-direction
Load.
The performance of the utility model adjustable negative poisson's ratio structure expands when having tension perpendicular to direction of pull, presses
The characteristic shunk when contracting perpendicular to pressure direction, the curved-beam element in negative poisson's ratio structure can be in the design process according to reality
The demand of structural behaviour carries out quantitative adjusting, has good adaptability, and the deformation having the same in plane X, Y-direction
Characteristic, this negative poisson's ratio structure all has negative poisson's ratio characteristic in plane both direction, and structure is full symmetric, in plane two
Mechanical property is identical on a direction, in specific actual application, is adapted to complex loading conditions, can be with NURBS
Curve models submissive curved beam, can quantitatively change its mechanical property by changing curved beam shape, and then change overall structure
Can, strong flexibility can satisfy the design requirement of various conditions, realize the adjustability of performance, using submissive curved-beam element, tool
Have small in concentrated stress, from fretting wear, movement is steady and the advantages that convenient for energy storage conversion, and service performance is excellent.
The embodiments of the present invention are given for the purpose of illustration and description, and are not exhaustively or to incite somebody to action
The utility model is limited to disclosed form.Many modifications and variations are aobvious and easy for the ordinary skill in the art
See.Embodiment was chosen and described in order to better illustrate the principle and practical application of the utility model, and makes this field
Those of ordinary skill it will be appreciated that the utility model to designing various embodiments suitable for specific applications with various modifications.
Claims (7)
1. a kind of adjustable negative poisson's ratio structure of performance, which is characterized in that including multiple negative poisson's ratio units, the negative poisson's ratio
Unit includes four submissive curved-beam elements and four connectors, and the connector is the cuboid that section is square, four companies
Junctor is symmetrical and two adjacent connectors between connected by the submissive curved-beam element, the curved beam compliance unit
End is connect with the end of the medial surface of the connector.
2. the adjustable negative poisson's ratio structure of performance according to claim 1, which is characterized in that multiple negative poisson's ratio units exist
The arrangement combination of plane periodically.
3. the adjustable negative poisson's ratio structure of performance according to claim 1, which is characterized in that the submissive curved-beam element
It is generated by nurbs curve Modeling and Design.
4. the adjustable negative poisson's ratio structure of performance according to claim 1, which is characterized in that the submissive curved-beam element is thick
The ratio between degree and height are 1:6.
5. the adjustable negative poisson's ratio structure of performance according to claim 1, which is characterized in that the length of the connector with
The ratio between side length of its square section is 4:1.
6. the adjustable negative poisson's ratio structure of performance according to claim 1, which is characterized in that the flexibility curved-beam element
Height is equal with the side length of the square section of the connector.
7. the adjustable negative poisson's ratio structure of performance described in any one of -6 according to claim 1, which is characterized in that the property
The adjustable negative poisson's ratio structure of energy utilizes 3D printing technique, and TPU material is selected to be integrated.
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| CN201920222594.9U CN209654492U (en) | 2019-02-22 | 2019-02-22 | The adjustable negative poisson's ratio structure of performance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109798311A (en) * | 2019-02-22 | 2019-05-24 | 大连交通大学 | The adjustable negative poisson's ratio structure of performance |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109798311A (en) * | 2019-02-22 | 2019-05-24 | 大连交通大学 | The adjustable negative poisson's ratio structure of performance |
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