CN115217822A - Two-phase mechanical metamaterial and manufacturing method thereof - Google Patents
Two-phase mechanical metamaterial and manufacturing method thereof Download PDFInfo
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- CN115217822A CN115217822A CN202110405754.5A CN202110405754A CN115217822A CN 115217822 A CN115217822 A CN 115217822A CN 202110405754 A CN202110405754 A CN 202110405754A CN 115217822 A CN115217822 A CN 115217822A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 claims description 6
- 230000009977 dual effect Effects 0.000 claims 4
- 239000000463 material Substances 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000003562 lightweight material Substances 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- F16B1/00—Devices for securing together, or preventing relative movement between, constructional elements or machine parts
- F16B1/02—Means for securing elements of mechanisms after operation
Abstract
The invention discloses a dual-phase mechanical metamaterial and a manufacturing method thereof, wherein the dual-phase mechanical metamaterial comprises the following components: the lattice unit cells are arranged in a preset mode to form a three-dimensional structure, the lattice unit cells comprise a hard phase lattice unit cell and a soft phase lattice unit cell, and each lattice unit cell comprises: the connector comprises a body part, a male connector and a female connector, wherein the body part is of a face-centered cubic structure or a body-centered cubic structure; the male head connecting part and the female head connecting part are respectively arranged at the top of the body part, and the two adjacent lattice unit cells are connected through the male head connecting part and the female head connecting part. The two-phase mechanical metamaterial has the advantages of higher connection strength, higher assembly efficiency and easiness in realizing mass manufacturing.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a dual-phase mechanical metamaterial and a manufacturing method thereof.
Background
The lightweight materials are always highly concerned by the aerospace and automobile industries, and more lightweight materials are continuously emerging and are applied. The lattice material has more excellent mechanical properties than the traditional disordered porous structures such as foam and the like as an ordered porous structure, and the two-phase lattice material with specific arrangement has excellent energy absorption characteristics and huge lightweight application potential. The two-phase lattice material has excellent energy absorption characteristics, and can realize the regulation and control of mechanical properties according to the selection of single-phase materials and different layouts, but is difficult to prepare in batch and at low cost to realize wide engineering application.
At present, the complex geometric shape and the processing technology of the lattice structure are limited, and the batch production of the complete lattice structural part, especially the complex two-phase lattice structure with more excellent mechanical property, is difficult to realize. In order to realize mass production of the dual-phase lattice, an assembled lattice structure is proposed and used. The assembling lattice is that the minimum unit cell of the complete lattice structure is determined, the mass production is realized by aiming at the unit cell design and processing technology, and then the unit cell is assembled according to the geometric shape of the structural part. However, for the conventional bolt connection, an assembly space needs to be considered, a certain requirement is imposed on the unit cell shape, and the production efficiency of manually assembling the bolt needs to be improved.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a dual-phase mechanical metamaterial, which has advantages of higher connection strength, higher assembly efficiency, and easy realization of mass production.
The invention also provides a manufacturing method applied to the dual-phase mechanical metamaterial.
The dual-phase mechanical metamaterial provided by the embodiment of the invention comprises the following components: the lattice unit cells are arranged in a preset mode to form a three-dimensional structure, the lattice unit cells comprise a hard phase lattice unit cell and a soft phase lattice unit cell, and each lattice unit cell comprises:
a body portion, the body portion being of a face centered cubic structure or a body centered cubic structure;
the lattice unit cell comprises a male head connecting part and a female head connecting part, wherein the male head connecting part and the female head connecting part are respectively arranged on the top point of the body part, and the two adjacent lattice unit cells are connected through the male head connecting part and the female head connecting part.
The two-phase mechanical metamaterial has the advantages of higher connection strength, higher assembly efficiency and easiness in realizing mass manufacturing.
According to the dual-phase mechanical metamaterial provided by the embodiment of the invention, the male connecting part comprises: the first base is connected with the body portion, and the connecting piece extends towards the direction far away from the first base.
According to the dual-phase mechanical metamaterial provided by one embodiment of the invention, the female connection part comprises a second base and a mounting groove located on the second base, the second base is connected with the body part, and the mounting groove extends from the surface of the second base to the inner side direction of the second base.
According to the dual-phase mechanical metamaterial provided by the embodiment of the invention, the connecting piece is matched with the mounting groove.
According to the dual-phase mechanical metamaterial provided by the embodiment of the invention, the outer contour of the connecting piece is integrally arc-shaped.
According to the dual-phase mechanical metamaterial provided by the embodiment of the invention, the connecting piece comprises a head part and a neck part, the neck part is used for connecting the head part and the first base, and the maximum width of the head part is larger than that of the neck part.
According to the dual-phase mechanical metamaterial provided by one embodiment of the invention, the connecting sheet and the mounting groove are connected through interference fit.
According to the diphasic mechanics metamaterial provided by one embodiment of the invention, the total number of the male head connecting parts and the female head connecting parts of the lattice unit cell is an even number which is greater than or equal to 6, and the number of the male head connecting parts is the same as that of the female head connecting parts.
According to the biphase mechanics metamaterial provided by the embodiment of the invention, the hard phase lattice unit cell is a lattice unit cell with an SC-BCC configuration, and/or the soft phase lattice unit cell is a lattice unit cell with a BCC configuration.
The method for manufacturing a dual-phase mechanical metamaterial according to the second aspect of the present invention is applied to the dual-phase mechanical metamaterial according to any one of the first aspect. The manufacturing method comprises the following steps:
inserting the plurality of lattice unit cells in a first direction to form a first unit cell array;
inserting the lattice unit cells in a second direction to form a second unit cell array;
inserting the lattice unit cells in a third direction to form a third unit cell array;
connecting and combining the first unit cell array, the second unit cell array and the third unit cell array to form a three-dimensional structure; wherein the first direction, the second direction and the third direction are perpendicular to each other.
In conclusion, the manufacturing method of the dual-phase mechanical metamaterial has the advantages of higher connection strength and assembly efficiency of the dual-phase mechanical metamaterial and easiness in realization of mass manufacturing.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a bi-directional mechanical based connection device according to an embodiment of the present invention;
FIG. 2 is a view schematically showing the structure of a unit module according to an embodiment of the present invention;
FIG. 3 is a second view showing the structure of a unit module according to an embodiment of the present invention;
FIG. 4 is a front view of a male connection portion according to an embodiment of the invention;
FIG. 5 is a top view of a male connection portion according to an embodiment of the invention;
FIG. 6 is a cross-sectional view of a female connection according to an embodiment of the invention;
fig. 7 is a top view of a female connection according to an embodiment of the invention.
Reference numerals:
100-biphase mechanics metamaterial, 1-hard phase lattice unit cell, 2-soft phase lattice unit cell, 3-body part, 4-male head connecting part, 41-first base, 42-connecting piece, 421-head part, 422-neck part, 5-female head connecting part, 51-second base and 52-mounting groove.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
A bi-phase mechanical metamaterial 100 according to an embodiment of the present invention is described below with reference to fig. 1-7. As shown in fig. 1, a dual-phase mechanical metamaterial 100 according to an embodiment of the present invention includes: the dual-phase mechanical metamaterial 100 comprises a plurality of lattice unit cells, and further comprises a plurality of lattice unit cells which are arranged in a preset mode to form a three-dimensional structure, as shown in fig. 2 and fig. 3, the lattice unit cells comprise a hard phase lattice unit cell 1 and a soft phase lattice unit cell 2, and therefore the lattice unit cells can be selected according to specific requirements through arrangement matching and connection characteristic curves of the hard phase lattice unit cell 1 and the soft phase lattice unit cell 2, and further has better compatibility and multifunctional characteristics, and wide application prospects.
Further, each lattice unit cell includes: the main body part 3, the male head connecting part 4 and the female head connecting part 5, further, the main body part 3 is of a face-centered cubic structure or a body-centered cubic structure, so that the stress uniformity of the lattice unit cell can be ensured; further, the male connection part 4 and the female connection part 5 are respectively arranged on the top of the body part 3, and two adjacent dot matrix unit cells are connected through the male connection part 4 and the female connection part 5, so that the connection reliability of the male connection part 4 and the female connection part 5 can be ensured, and the connection reliability of the diphasic mechanical metamaterial 100 can be improved. In the description of the present invention, "a plurality" means two or more.
The dual-phase mechanical metamaterial 100 provided by the invention has the advantages of higher connection strength, higher assembly efficiency and easiness in realizing mass production.
According to the dual-phase mechanical metamaterial 100 of one embodiment of the present invention, as shown in fig. 2 and 3, the male connection portion 4 includes: the first base 41 is connected to the body portion 3, and the connecting piece 42 extends in a direction away from the first base 41. Further, as shown in fig. 4, the connecting piece 42 is determined by two characteristic radii, i.e., R1 and R2, it should be noted that the shape of the connecting piece 42 determines the assembling stress during the connecting process, and the larger R1 is than R2, the more difficult the assembling is, but the connecting strength is higher.
According to the dual-phase mechanical metamaterial 100 of one embodiment of the present invention, as shown in fig. 2 and 3, the female connection portion 5 includes: a second base 51 and a mounting groove 52 positioned on the second base 51, wherein the second base 51 is connected with the main body 3, and the mounting groove 52 extends from the surface of the second base 51 to the inner side direction of the second base 51.
According to the dual-phase mechanical metamaterial 100 of one embodiment of the present invention, the connecting pieces 42 are matched with the mounting grooves 52. Therefore, the connection reliability of the male connection part 4 and the female connection part 5 can be ensured, and the connection reliability of the dual-phase mechanical metamaterial 100 is further improved.
According to the dual-phase mechanical metamaterial 100 of one embodiment of the present invention, the outer contour of the connecting piece 42 is generally arc-shaped.
According to the dual-phase mechanical metamaterial 100 of one embodiment of the present invention, as shown in fig. 4, the connecting piece 42 includes a head 421 and a neck 422, and specifically, the neck 422 connects the head 421 with the first base 41, it should be noted that the maximum width of the head 421 is greater than the maximum width of the neck 422.
Further, the assembly mode of connection piece 42 and mounting groove 52 is connected for simple efficient formula of cuting straightly, constitutes the auto-lock through connection piece 42 and mounting groove 52 interference fit and friction, makes public first connecting portion 4 and female first connecting portion 5 be difficult for deviating from, plays the fastening effect to assembly efficiency has greatly been improved.
According to the dual-phase mechanical metamaterial 100 provided by the embodiment of the invention, the connecting piece 42 and the mounting groove 52 are connected through interference fit. Thus, the reliability of the connection of the dual-phase mechanical metamaterial 100 is improved.
According to the bi-phase mechanical metamaterial 100 of one embodiment of the present invention, the total number of the male connection portions 4 and the female connection portions 5 of the lattice unit cell is an even number greater than or equal to 6, and the number of the male connection portions 4 is the same as the number of the female connection portions 5. For example, in one specific embodiment, the number of the male connector 4 and the female connector 5 may be three. Specifically, the male head connecting part 4 of one lattice unit cell corresponds to the female head connecting part 5 of another lattice unit cell one by one, so that the expansibility of the lattice unit cell in three directions can be ensured.
According to the bi-phase mechanical metamaterial 100 of one embodiment of the present invention, the hard phase lattice unit cell 1 is a lattice unit cell with SC-BCC configuration, and further, the soft phase lattice unit cell 2 is a lattice unit cell with BCC configuration.
According to the dual-phase mechanical metamaterial 100 of one embodiment of the present invention, the body portion 3 is a regular octahedron, which is beneficial to improve the structural stability of the body portion 3. The main body 3 may be a regular polyhedron such as a regular tetrahedron or a regular hexahedron.
According to the bi-phasic metamaterial 100 of one embodiment of the present invention, the lattice unit cell can be manufactured by a 3D printing method, which is advantageous for mass production.
According to the bi-phasic metamaterial 100 of one embodiment of the present invention, the lattice unit cells may select a high energy absorption distribution mode arranged tangentially to each other, or an arrangement mode with high strength and rigidity of a continuous network structure. The connection method of lattice unit is not limited to this.
According to the bi-phase mechanical metamaterial 100 provided by the embodiment of the invention, the lattice unit cells can be integrally formed, so that the mass production of the lattice unit cells is facilitated.
In conclusion, the dual-phase mechanical metamaterial 100 provided by the invention has the advantages of higher connection strength, higher assembly efficiency and easiness in realizing mass production; in addition, the hard-phase lattice unit cell 1 and the soft-phase lattice unit cell 2 can be selected according to specific requirements through arrangement matching and connection characteristic curves, so that the biphase mechanical metamaterial 100 has better compatibility and multifunctional characteristics, and has wide application prospects.
The method for manufacturing the dual-phase mechanical metamaterial 100 according to the second aspect of the present invention is applied to the dual-phase mechanical metamaterial 100 as in the first aspect. Specifically, the manufacturing method includes: inserting a plurality of lattice unit cells in a first direction to form a first unit cell array; note that the first direction is the X direction in fig. 1; furthermore, a plurality of lattice unit cells are spliced in a second direction to form a second unit cell array; note that the second direction is the Y direction in fig. 1; furthermore, a plurality of lattice unit cells are spliced in a third direction to form a third unit cell array; note that, the third direction is the Z direction in fig. 1; further, connecting and combining the first unit cell array, the second unit cell array and the third unit cell array to form a three-dimensional structure; the first direction, the second direction and the third direction are mutually vertical.
In summary, the manufacturing method of the dual-phase mechanical metamaterial 100 according to the second aspect of the present invention has the advantages of better design, higher connection strength, higher assembly efficiency, easy mass manufacturing, wider application prospect, and the like.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A dual-phase mechanical metamaterial, comprising: the lattice unit cells are arranged in a preset mode to form a three-dimensional structure, the lattice unit cells comprise a hard phase lattice unit cell and a soft phase lattice unit cell, and each lattice unit cell comprises:
a body portion, the body portion being of a face centered cubic structure or a body centered cubic structure;
the lattice unit cell comprises a male head connecting part and a female head connecting part, wherein the male head connecting part and the female head connecting part are respectively arranged on the top point of the body part, and the two adjacent lattice unit cells are connected through the male head connecting part and the female head connecting part.
2. The dual-phase mechanical metamaterial according to claim 1, wherein the male connection portion includes: the first base is connected with the body portion, and the connecting piece extends towards the direction far away from the first base.
3. The dual phase mechanical metamaterial according to claim 2, wherein the female connection portion includes a second base and a mounting groove on the second base, the second base is connected to the body portion, and the mounting groove extends from a surface of the second base to an inner side of the second base.
4. A bi-phase mechanical metamaterial according to claim 3, wherein the connecting tab and the mounting groove mate.
5. A dual phase mechanical metamaterial according to claim 4, wherein the outer profile of the connecting sheet is generally arcuate.
6. The dual phase mechanical metamaterial according to claim 5, wherein the connecting sheet includes a head and a neck connecting the head and the first base, wherein a maximum width of the head is greater than a maximum width of the neck.
7. The dual phase mechanical metamaterial according to claim 6, wherein the connection tabs and the mounting slots are connected by an interference fit.
8. A bi-phase mechanical metamaterial according to any one of claims 2 to 7, wherein the total number of the male and female head connection portions of the lattice unit cell is an even number equal to or greater than 6, and the number of the male head connection portions is the same as the number of the female head connection portions.
9. A bi-phase mechanical metamaterial according to claim 8, wherein the lattice unit cell of hard phase is a lattice unit cell of SC-BCC configuration, and/or the lattice unit cell of soft phase is a lattice unit cell of BCC configuration.
10. A method for manufacturing a bi-phasic metamaterial according to any one of claims 1 to 9, wherein the lattice unit cells are spliced in a first direction to form a first unit cell array;
inserting the lattice unit cells in a second direction to form a second unit cell array;
inserting the lattice unit cells in a third direction to form a third unit cell array;
connecting and combining the first unit cell array, the second unit cell array and the third unit cell array to form a three-dimensional structure;
wherein the first direction, the second direction and the third direction are perpendicular to each other.
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| CN202110405754.5A CN115217822A (en) | 2021-04-15 | 2021-04-15 | Two-phase mechanical metamaterial and manufacturing method thereof |
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| CN202110405754.5A CN115217822A (en) | 2021-04-15 | 2021-04-15 | Two-phase mechanical metamaterial and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115556426A (en) * | 2022-11-03 | 2023-01-03 | 哈尔滨工业大学 | Lattice structure based on discrete unit cell interlocking and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105605411A (en) * | 2015-12-23 | 2016-05-25 | 北京博简复才技术咨询有限公司 | Composite material curved surface structural unit and composite material cell lattice structure |
| US20160208476A1 (en) * | 2013-08-27 | 2016-07-21 | University Of Virginia Patent Foundation | Three-dimensional space frames assembled from component pieces and methods for making the same |
| CN207485786U (en) * | 2017-05-25 | 2018-06-12 | 景德镇昌河航空设备技术有限责任公司 | A kind of flanging bar assembly |
| US20190292768A1 (en) * | 2018-03-26 | 2019-09-26 | Eric Yates | Flexible space frame, components thereof and method of construction |
-
2021
- 2021-04-15 CN CN202110405754.5A patent/CN115217822A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160208476A1 (en) * | 2013-08-27 | 2016-07-21 | University Of Virginia Patent Foundation | Three-dimensional space frames assembled from component pieces and methods for making the same |
| CN105605411A (en) * | 2015-12-23 | 2016-05-25 | 北京博简复才技术咨询有限公司 | Composite material curved surface structural unit and composite material cell lattice structure |
| CN207485786U (en) * | 2017-05-25 | 2018-06-12 | 景德镇昌河航空设备技术有限责任公司 | A kind of flanging bar assembly |
| US20190292768A1 (en) * | 2018-03-26 | 2019-09-26 | Eric Yates | Flexible space frame, components thereof and method of construction |
Non-Patent Citations (1)
| Title |
|---|
| 张钱城;卢天健;闻婷;: "轻质高强点阵金属材料的制备及其力学性能强化的研究进展", 力学进展, no. 02, pages 31 - 43 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115556426A (en) * | 2022-11-03 | 2023-01-03 | 哈尔滨工业大学 | Lattice structure based on discrete unit cell interlocking and preparation method thereof |
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