CN116428298A - Negative poisson ratio mixed material superstructure - Google Patents
Negative poisson ratio mixed material superstructure Download PDFInfo
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- CN116428298A CN116428298A CN202310258190.6A CN202310258190A CN116428298A CN 116428298 A CN116428298 A CN 116428298A CN 202310258190 A CN202310258190 A CN 202310258190A CN 116428298 A CN116428298 A CN 116428298A
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- straight
- straight beam
- beam arm
- negative poisson
- cell
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- 239000000463 material Substances 0.000 title claims abstract description 33
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 14
- 239000004917 carbon fiber Substances 0.000 claims abstract description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002131 composite material Substances 0.000 claims abstract description 13
- 230000001154 acute effect Effects 0.000 claims abstract description 8
- 238000010030 laminating Methods 0.000 claims abstract description 7
- 239000007769 metal material Substances 0.000 claims abstract description 5
- 239000011159 matrix material Substances 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 7
- 238000010521 absorption reaction Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F3/00—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic
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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
- F16S—CONSTRUCTIONAL ELEMENTS IN GENERAL; STRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
- F16S3/00—Elongated members, e.g. profiled members; Assemblies thereof; Gratings or grilles
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- 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 negative poisson ratio mixed material superstructure, which comprises a first straight beam arm and a second straight beam arm, wherein the first end of the first straight beam arm is connected with the first end of the second straight beam arm at an acute angle to form a repeating unit, the repeating unit is mirrored left and right once to form a cell, the second ends of two adjacent first straight beam arms of the cell are connected at an obtuse angle, and the second ends of two adjacent second straight beam arms are connected at an acute angle to form a closed structure; the structure of first straight-bar beam arm, second straight-bar beam arm all includes base member and laminating portion, and laminating portion is attached and is being located at the base member the outside or inside one side of cell, and the base member adopts metal material, and laminating portion adopts carbon fiber composite material. The invention solves the problems of insufficient rigidity strength of the metal structure with the negative poisson ratio and the problem of fragility of the carbon fiber composite material structure with the negative poisson ratio under pressure, combines the advantages of the metal structure with the negative poisson ratio, and improves the light weight effect and the energy absorbing capability of the structure.
Description
Technical Field
The invention relates to the technical field of metamaterial, in particular to a negative poisson ratio mixed material superstructure.
Background
The negative poisson ratio structure is a generic term for mechanical metamaterials with poisson ratio of negative values. Under the action of axial pressure (tension), the traditional material expands (contracts) in the direction perpendicular to the pressure (tension), while under the action of the same axial pressure (tension), the negative poisson ratio metamaterial contracts (expands) in the direction perpendicular to the pressure (tension), namely, the negative poisson ratio effect is generated. Therefore, the negative poisson ratio metamaterial has the advantages in the aspects of vibration reduction, energy absorption, fracture resistance, impact resistance and the like compared with the traditional material. And the negative poisson ratio structure has a large number of gaps, and compared with the traditional material with the same volume, the negative poisson ratio structure has lighter weight and has wide application in the fields of automobile weight reduction, aerospace and the like.
The negative poisson ratio structure is made of various materials, and is mainly used for the most wide application in engineering application, but because the porosity of the negative poisson ratio metal structure is large, the mechanical properties such as rigidity and strength are poor, and the bearing capacity is limited, so that the application of the negative poisson ratio structure is limited to a certain extent. Aiming at the defects of the negative poisson ratio metal structure, the filling of light materials in the gaps of the negative poisson ratio metal structure is proposed to improve the bearing capacity of the negative poisson ratio metal structure, but the scheme reduces the negative poisson ratio effect and the light weight effect of the negative poisson ratio metal structure to a certain extent. There is thus currently a lack of effective designs that meet the light weight and energy absorbing effects.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the negative poisson ratio mixed material super structure, which solves the problems of insufficient bearing capacity of a negative poisson ratio metal structure and compression and fragility of a negative poisson ratio carbon fiber composite material structure, and improves the light weight effect and energy absorption capacity of the structure.
The technical scheme adopted by the invention is as follows:
the super structure of the negative poisson ratio mixed material is characterized by comprising a first straight-bar beam arm and a second straight-bar beam arm, wherein the first end of the first straight-bar beam arm is connected with the first end of the second straight-bar beam arm at an acute angle to form a repeating unit, the repeating unit is mirrored once left and right to form a cell, the second ends of two adjacent first straight-bar beam arms of the cell are connected at an obtuse angle, and the second ends of two adjacent second straight-bar beam arms of the cell are connected at an acute angle to form a closed structure;
the structure of the first straight-bar beam arm and the structure of the second straight-bar beam arm respectively comprise a matrix and a bonding part, the bonding part is attached to one side of the matrix, which is positioned outside or inside the cell, the matrix is made of a metal material, and the bonding part is made of a carbon fiber composite material.
The first ends of the first straight beam arms and the first ends of the second straight beam arms, the second ends of the two adjacent first straight beam arms of the cell and the second ends of the two adjacent second straight beam arms are all connected in sequence through the matrix.
The horizontal spans of the first straight beam arm and the second straight beam arm in each repeating unit are equal, namely:
wherein L1 and L2 are the lengths of the first straight beam arm and the second straight beam arm respectively, θ 1 、θ 2 Respectively the included angles theta between the first straight beam arm, the second straight beam arm and the vertical direction 2 ＜θ 1 ＜90°。
The substrate is formed by stacking a plurality of layers of plate-shaped structures.
The attaching part of the first straight beam arm is attached to the outer side of the first straight beam arm along the outline of the base body, and the attaching part of the second straight beam arm is attached to the inner side of the second straight beam arm along the outline of the base body.
The thickness of the laminating portion and the base body of two straight-bar beam arms are equal respectively: t11=t21, t12=t22, T11 and T21 are thicknesses of the bonding portions of the two straight beam arms, and T12 and T22 are thicknesses of the base bodies of the two straight beam arms.
The cells are periodically arranged in a plane to form a closely embedded mixed material structure, the mixed material structure is positioned between two adjacent cells in the horizontal direction and shares a second straight beam arm, and the second ends of two adjacent second straight beam arms of the upper cell in the vertical direction of the mixed material structure are connected with the second ends of two adjacent first straight beam arms of the lower cell.
The beneficial effects of the invention are as follows:
the invention overcomes the defects of limited bearing capacity of the negative poisson ratio metal structure and the defect of fragility of the negative poisson ratio carbon fiber composite material structure due to compression aiming at the defects of energy absorption performance of different material structures of the negative poisson ratio structure, and strengthens the negative poisson ratio structure by combining the carbon fiber reinforced joint part with the metal matrix, thereby improving the structural energy absorption capacity while ensuring the structural ductility.
The reinforcing joint part is formed by stacking a plurality of layers of plate-shaped structures, and the mechanical properties of the double-arrow-shaped stretching structure can be adjusted by adjusting the structural parameters such as the layering angle, the layering proportion and the like of each plate-shaped structure.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a single cell according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of parameters of a single cell according to an embodiment of the invention.
Fig. 3 is a schematic diagram of different bonding schemes of a single cell according to an embodiment of the present invention.
Fig. 4 is a graph of force versus displacement under compressive load for different attachment schemes for individual cells of an example of the present invention.
Fig. 5 is a schematic diagram of a negative poisson ratio mixed material super structure formed by arranging cells according to characteristic rules in an embodiment of the invention.
Fig. 6 is a graph of force versus displacement under compressive load of a negative poisson ratio hybrid material superstructure and a negative poisson ratio metallic material structure, and a negative poisson ratio carbon fiber composite structure, according to an embodiment of the present invention, under the same geometric parameters.
In the figure: 10. a cell; 11. a first straight bar beam arm; 12. the second straight beam arm; 100. a base; 101. and a bonding part.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
Referring to fig. 1, the super structure of a negative poisson ratio mixed material in this embodiment includes a first straight beam arm 11 and a second straight beam arm 12, where a first end of the first straight beam arm 11 and a first end of the second straight beam arm 12 are connected at an acute angle to form a repeating unit, the repeating unit is mirrored once left and right to form a cell 10, and second ends of two adjacent first straight beam arms 11 of the cell 10 are connected at an obtuse angle and second ends of two adjacent second straight beam arms 12 are connected at an acute angle, so that the cell 10 forms a closed structure;
the first straight beam arm 11 and the second straight beam arm 12 respectively comprise a substrate 100 and a bonding part 101, the bonding part 101 is attached to one side of the substrate 100, which is positioned outside or inside the cell 10, the substrate 100 is made of a metal material, and the bonding part 101 is made of a carbon fiber composite material.
Specifically, the first ends of the first straight beam arms 11 and the first ends of the second straight beam arms 12, the second ends of the adjacent two first straight beam arms 11 of the cell 10, and the second ends of the adjacent two second straight beam arms 12 are all connected in parallel through the substrate 100.
Referring to fig. 2, in order to ensure tightness of the connection between the repeating units in the splicing process, the first straight beam arm 11 and the second straight beam arm 12 in each repeating unit of the structure have equal spans in the horizontal direction, namely:
wherein L1 and L2 are the lengths of the first straight beam arm 11 and the second straight beam arm 12 respectively, θ 1 、θ 2 Respectively the included angles theta between the first straight beam arm 11, the second straight beam arm 12 and the vertical direction 2 ＜θ 1 ＜90°。
Preferably, the bonding portion 101 is formed by stacking a plurality of plate-like structures, and the mechanical properties of the structure can be adjusted by controlling the parameters of the structure such as the layering angle and layering ratio of each plate-like structure in the bonding portion 101.
Referring to fig. 3, the fitting portion 101 of the first straight beam arm 11 may be fitted inside or outside the contour of the base 100, and the fitting portion 101 of the second straight beam arm 12 may be fitted inside or outside the contour of the base 100. It will be understood that the "inner" and "outer" are defined by taking a cell as a reference frame, and the "inner" is defined as a side located inside the cell, and the "outer" is defined as a side located outside the cell, and four schemes are combined internally and externally:
scheme 1: the attaching portion 101 of the first straight beam arm 11 is attached to the outer side of the base 100 along the contour of the base 100, and the attaching portion 101 of the second straight beam arm 12 is attached to the inner side of the base 100 along the contour of the base 100;
scheme 2: the attaching portion 101 of the first straight beam arm 11 is attached to the outer side of the base 100 along the contour of the base 100, and the attaching portion 101 of the second straight beam arm 12 is attached to the outer side of the base 100 along the contour of the base 100;
scheme 3: the attaching portion 101 of the first straight beam arm 11 is attached to the inner side of the base 100 along the contour of the base 100, and the attaching portion 101 of the second straight beam arm 12 is attached to the inner side of the base 100 along the contour of the base 100;
scheme 4: the attaching portion 101 of the first straight beam arm 11 is attached to the inner side of the base 100 along the contour thereof, and the attaching portion 101 of the second straight beam arm 12 is attached to the outer side of the base 100 along the contour thereof.
Referring to fig. 4, the mechanical properties of the structures under the four schemes are also different, and as can be seen from the figure, the energy absorption effect of the scheme 2 is relatively better.
Referring to fig. 5, the cells 10 are periodically arranged in a plane to form a closely-embedded mixed material structure, wherein the mixed material structure is located between two adjacent cells 10 in the horizontal direction and shares one second straight beam arm 12, and the second ends of two adjacent second straight beam arms 12 of the upper cell 10 are connected with the second ends of two adjacent first straight beam arms 12 of the lower cell 10 in the vertical direction.
Referring to fig. 6, the negative poisson ratio mixed material superstructure of the embodiment has better energy absorbing capability under the same compression displacement compared with the negative poisson ratio metal structure under the same geometric parameter condition; compared with a carbon fiber composite material structure with negative poisson ratio under the same geometric parameter condition, the carbon fiber composite material structure has better extensibility and bears larger compression displacement.
The negative poisson ratio hybrid material superstructure of the embodiment overcomes the problems that a traditional negative poisson ratio carbon fiber composite material structure has good rigidity strength, is fragile and cannot be applied to the engineering fields such as energy absorption and the like in a landing mode, and simultaneously overcomes the problems that a traditional negative poisson ratio metal structure is large in porosity, poor in mechanical properties such as rigidity strength and the like and limited in bearing capacity, and the advantages of the traditional negative poisson ratio carbon fiber composite material structure and the traditional negative poisson ratio carbon fiber composite material structure are combined, so that the hybrid material structure has good ductility and structural energy absorption capacity is improved.
Those of ordinary skill in the art will appreciate that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The super structure of the negative poisson ratio mixed material is characterized by comprising a first straight-bar beam arm (11) and a second straight-bar beam arm (12), wherein the first end of the first straight-bar beam arm (11) is connected with the first end of the second straight-bar beam arm (12) at an acute angle to form a repeating unit, the repeating unit is mirrored left and right once to form a cell (10), the second ends of two adjacent first straight-bar beam arms (11) of the cell (10) are connected at an obtuse angle, and the second ends of two adjacent second straight-bar beam arms (12) are connected at an acute angle to form a closed structure;
the structure of first straight-bar beam arm (11) the structure of second straight-bar beam arm (12) all includes base member (100) and laminating portion (101), laminating portion (101) are attached base member (100) are located outside or inside one side of cell (10), base member (100) adopts metal material, laminating portion (101) adopts carbon fiber composite material.
2. The negative poisson's ratio hybrid material superstructure according to claim 1, wherein the first ends of the first straight beam arms (11) and the first ends of the second straight beam (12) and the second ends of two adjacent first straight beam arms (11) and the second ends of two adjacent second straight beam arms (12) of the cell (10) are all joined by the matrix (100).
3. The negative poisson's ratio hybrid material superstructure according to claim 1, wherein the first straight beam arm (11) and the second straight beam arm (12) in each repeating unit are equally spanned in the horizontal direction, i.e.:
wherein L1 and L2 are the lengths of the first straight beam arm (11) and the second straight beam arm (12), respectively, theta 1 、θ 2 Respectively comprises a first straight beam arm (11), a second straight beam arm (12) and an included angle theta 2 ＜θ 1 ＜90°。
4. The negative poisson's ratio hybrid material superstructure according to claim 1, wherein the matrix (100) is stacked from a multi-layered plate-like structure.
5. The negative poisson ratio mixed material superstructure according to claim 1, wherein the attaching portion (101) of the first straight beam arm (11) is attached to a side thereof located outside the cell (10) along the contour of the base body (100), and the attaching portion (101) of the second straight beam arm (12) is attached to a side thereof located outside the cell (10) along the contour of the base body (100).
6. The negative poisson's ratio hybrid material superstructure according to claim 1, wherein the thickness of the abutment (101) of the two straight beam arms and the substrate (100) are respectively equal: t11=t21, t12=t22, T11 and T21 are thicknesses of the bonding portions (101) of the two straight beam arms, and T12 and T22 are thicknesses of the base body (100) of the two straight beam arms.
7. The negative poisson ratio hybrid material superstructure according to claim 1, wherein the cells (10) are periodically arranged in a plane to form a closely-fitted hybrid material structure, the hybrid material structure is located between two adjacent cells (10) in a horizontal direction and shares a second straight beam arm (12), and second ends of two adjacent second straight beam arms (12) of an upper cell (10) and second ends of two adjacent first straight beam arms (12) of a lower cell (10) of the hybrid material structure are connected in a vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310258190.6A CN116428298A (en) | 2023-03-17 | 2023-03-17 | Negative poisson ratio mixed material superstructure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310258190.6A CN116428298A (en) | 2023-03-17 | 2023-03-17 | Negative poisson ratio mixed material superstructure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116428298A true CN116428298A (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310258190.6A Pending CN116428298A (en) | 2023-03-17 | 2023-03-17 | Negative poisson ratio mixed material superstructure |
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| Country | Link |
|---|---|
| CN (1) | CN116428298A (en) |
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2023
- 2023-03-17 CN CN202310258190.6A patent/CN116428298A/en active Pending
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