CN112283277A - Composite lattice structure integrating structure bearing and vibration control and preparation method thereof - Google Patents
Composite lattice structure integrating structure bearing and vibration control and preparation method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title description 2
- 239000000463 material Substances 0.000 claims abstract description 30
- 238000013016 damping Methods 0.000 claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000010146 3D printing Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 6
- 230000008439 repair process Effects 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 239000011800 void material Substances 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 3
- 239000011229 interlayer Substances 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 238000007493 shaping process Methods 0.000 abstract description 3
- 239000011162 core material Substances 0.000 description 19
- 238000013461 design Methods 0.000 description 18
- 230000009467 reduction Effects 0.000 description 9
- 239000012792 core layer Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000006261 foam material 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
- 229920001778 nylon Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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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
- F16F3/08—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of a material having high internal friction, e.g. rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
-
- 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
- F16F2224/00—Materials; Material properties
- F16F2224/02—Materials; Material properties solids
- F16F2224/0225—Cellular, e.g. microcellular foam
-
- 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
- F16F2224/00—Materials; Material properties
- F16F2224/02—Materials; Material properties solids
- F16F2224/025—Elastomers
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a composite lattice structure integrating structure bearing and vibration control, which comprises at least two sandwich plates and a core body arranged between the two sandwich plates; the core body is of a very small curved surface lattice structure; the minimum curved surface lattice structure comprises a plurality of minimum curved surface lattice unit cells which are periodically and regularly arranged in a three-dimensional space and are mutually connected; the extremely-small curved surface lattice unit cell comprises a structure formed by actually forming an extremely-small curved surface; the manufacturing method comprises the following steps: s1., drawing the minimal curved surface by using Matlab software to obtain the surface of the minimal curved surface lattice structure, and carrying out materialization processing on the minimal curved surface to form a minimal curved surface lattice structure unit cell; forming a core body of a minimum curved surface lattice structure after the single cells are arrayed in space; s2, selecting a proper material to perform 3D printing to manufacture the core body, and fixedly connecting the core body with the two interlayers; s3. and filling the damping material in molten state into the gaps of the core body, and cooling and shaping.
Description
Technical Field
The invention relates to the technical field of material structures, in particular to a dot matrix sandwich structure. The structure adopts a minimum curved surface lattice structure as a core layer, adopts damping materials as a sandwich structure gap filling material, has the characteristics of light weight, porosity, high bearing capacity, vibration reduction and the like, can effectively adjust structural vibration, and has wide application prospect on bearing and vibration control integrated multifunctional parts.
Background
With the rapid development of aerospace and traffic technologies in China, the demand for light components integrating bearing and vibration control is stronger. Under the condition of meeting the functional requirements, the lightweight design can greatly reduce the manufacturing resources and the energy consumption in use; meanwhile, the design of multifunctional components integrating bearing and vibration control can reduce the use number of functional components, and the purposes of light structure, system simplification and resource saving are achieved. Patent CN 201810615351.1-a light space lattice structure discloses a light space lattice structure with high strength, but it is similar to the traditional lattice structure, and is a designed space truss structure, and sharp corners can be formed at the intersection nodes of the rod system, resulting in the generation of stress concentration phenomenon, and further affecting the overall bearing characteristic. Patent CN 201710227184.9-9-a lattice-foam filler sandwich panel structure discloses a lattice sandwich panel structure filled with foam material with high strength and excellent impact resistance. The structure still uses the rod system structure as the core main material, has the problem of stress concentration, and simultaneously the filling material only strengthens the impact resistance, and has single function and limited application range. Patent CN 201920637765.4-a sound absorption composite structure unit and sound absorber array with it disclose a porous structure design with vibration reduction and sound absorption functions and effective reduction of sound transmission. The structure is complex to process, has larger volume and only has a protection function, and is difficult to effectively bear. Therefore, the traditional truss lattice structure has defects in bearing capacity and single function, the common vibration-damping sound-absorbing structure does not have bearing capacity, and compared with the multifunctional composite lattice sandwich structure integrating bearing and vibration control, the structure has remarkable advantages.
Disclosure of Invention
In order to reduce the resource loss of the manufacturing and operation of traffic equipment, the lightweight design of parts such as airplanes and automobiles is realized, and the requirement of the bearing capacity of the parts is met; meanwhile, in order to reduce the use of an additional vibration reduction function component in the equipment, the vibration control of the component and the simplified design of the whole structure are realized. The invention aims to innovatively adopt a minimum curved surface structure as a sandwich structure core layer main body, avoid the problem of stress concentration caused by sharp corners at nodes of the traditional lattice structure and improve the bearing performance; filling damping materials in the gaps of the interlayer to achieve a vibration reduction effect, and controlling the vibration of the component; finally, the lattice sandwich structure design with composite functions is completed.
The invention relates to a composite lattice sandwich structure integrating bearing and vibration control, which comprises at least two sandwich plates and a core body arranged between the two sandwich plates; the core body is of a very small curved surface lattice structure; the small-curved-surface dot array structure comprises a plurality of small-curved-surface dot array unit cells which are periodically and regularly arranged in a three-dimensional space and are mutually connected; the extremely-small-curved-surface lattice unit cell comprises a structure formed by actually forming an extremely-small curved surface.
Further, damping materials are filled in the structural gaps in the core body.
Further, the minimum curved surface is a Gyroid minimum curved surface; the damping material is silica gel.
The invention also discloses a manufacturing method of the composite lattice sandwich structure integrating bearing and vibration control, which comprises the following steps:
s1., drawing the minimal curved surface by using Matlab software to obtain the surface of the minimal curved surface lattice structure, and carrying out materialization processing on the minimal curved surface to form a minimal curved surface lattice structure unit cell; forming a core body of a minimum curved surface lattice structure after the single cells are arrayed in space;
s2, selecting a proper material to carry out 3D printing to manufacture the core body, and enabling the core body to be fixedly connected with the two interlayers;
s3. and filling the damping material in molten state into the gaps of the core body, and cooling and shaping.
Further, in step s1, the minimum curved surface is a Gyroid minimum curved surface, and its expression is:
wherein, the setting parameter t is 0.5, the setting parameter omega is 0.5 pi, and the setting parameters x, y and z are within (-2.5, 1.5).
Further, in step s1, after the extremely small curved surface is drawn, Magics software should be used to repair and fill the missing surface in the curved surface.
The invention has the beneficial effects that:
1. this structure core part adopts minimum curved surface lattice structure design, compares in traditional rod system structure, and minimum curved surface lattice structure rod system intersection transition is smooth, does not have the closed angle, great reduction stress concentration phenomenon's emergence to improve overall structure's mechanical properties, more can embody light-weighted theory.
2. The structure realizes the corresponding vibration reduction function by filling different damping materials, has wide application range, simple design and processing method and universal applicability.
3. The structure integrates the bearing performance and the vibration control function, solves the problem that the traditional lattice structure is single in function and the vibration reduction device is difficult to bear, and can effectively reduce the complexity of the equipment structure.
Drawings
The technical scheme of the invention is further explained by combining the drawings and the embodiment as follows:
FIG. 1 is a schematic view of a composite lattice sandwich structure;
FIG. 2 is a schematic diagram of a three-dimensional curved surface drawn by Matlab;
FIG. 3 is a three-dimensional model after the Magics software repairs the filled curved surface;
FIG. 4 is a solid model of a single cell with a very small curved surface;
FIG. 5 is a schematic diagram of a lattice structure formed by a unit cell array;
FIG. 6 is a schematic diagram of a BCC lattice sandwich structure;
FIG. 7 is a schematic view of a composite lattice sandwich structure;
FIG. 8 is a comparison curve of mechanical properties of different lattice sandwich structures.
Fig. 9 is a comparison curve of mechanical properties of each structure.
Detailed Description
The composite lattice sandwich structure of the embodiment comprises at least two sandwich plates and a core body arranged between the two sandwich plates; the core body is of a very small curved surface lattice structure; the minimum curved surface lattice structure comprises a plurality of minimum curved surface lattice unit cells which are periodically and regularly arranged in a three-dimensional space and are mutually connected; the extremely-small-curved-surface lattice unit cell comprises a structure formed by materializing a Gyroid extremely-small curved surface; and damping materials such as silica gel and the like are filled in the gap of the inner structure in the core body. On the basis of the design of the lattice sandwich structure, according to the problems of performance defects of the lattice structure of the bar system and single function of components, the invention innovatively invents the composite lattice sandwich structure integrating bearing and vibration control, the structure is more superior in mechanical property, and has a certain vibration damping effect after being filled with damping materials, so that the complexity of equipment design can be effectively reduced, and a good thought is provided for the design and development of multifunctional composite component components.
The specific structure design method of the composite lattice sandwich structure of this embodiment is shown in fig. 1 below: according to the figure, the structure can be obviously observed that the structure adopts a tiny curved surface lattice structure as a core body, the connection between units is tight, the transition is smooth, no sharp corner exists between the rods, and the structure has excellent bearing capacity; the structural gap is filled with damping materials, the filling method is simple and easy to operate, the filling materials are uniformly distributed, and the damping material can be effectively applied to the field of vibration reduction.
The present embodiment utilizes the simple structure of the array 2x2x2 to describe the design flow and main features of the overall structure.
Firstly, the core structure is designed, the Gyroid tiny curved surface is selected as the core structure according to the data lookup, and the design flow is as follows:
(1) drawing a graph according to a Gyroid minimum curved surface formula:
the Gyroid minimum curved surface design expression is shown as follows, and is an isosurface when a function value is 0, and the structural shape can be effectively controlled by the parameters t and omega;
setting the isosurface parameter t to be 0.5, setting the periodicity parameter to be 0.5 pi, setting the structural size range parameters x, y and z to be (-2.5 and 1.5), and then drawing a curved surface by using Matlab to obtain the three-dimensional extremely-small curved surface of the graph 2;
(2) according to the drawn curved surface, Magics software is used, and a repairing tool contained in the Magics software is adopted to fill up the missing surface, so that a processed three-dimensional model shown in fig. 3 is obtained;
(3) after the surface repair is finished, converting the execution surface into an entity operation, and carrying out an materialization treatment to obtain a single cell entity core structure;
(4) as shown in fig. 5, according to the design structure requirement, the whole core structure, here, an array of 2 × 2, can be obtained by arraying the minimum curved surface unit structures;
(5) and then directly printing the solid core material in a 3D mode.
Secondly, designing a filling part of the intermediate damping material, and carrying out solid processing and direct pouring, cooling and shaping. It is intended here to illustrate the overall structural components after the design is completed and to serve as a subsequent simulation experiment:
and (3) according to the extremely-small curved-surface core structure design obtained in the step (one), using modeling software, and obtaining the structural shape of the filling part through Boolean operation (the filling material is represented by thin dots in FIG. 1).
And thirdly, assembling the sandwich plate, the core layer and the filling material according to a certain matching relationship to obtain the integral structure shown in the figure 1.
Under the condition that the relative densities are all 0.34, a lattice sandwich structure with a tiny curved surface and a lattice sandwich structure with the traditional BCC are established, and compared with a composite sandwich structure filled with damping materials, the structures of the lattice sandwich structure with the tiny curved surface and the lattice sandwich structure with the traditional BCC are respectively shown in figures 6, 7 and 8.
Finally, stress-strain curves of the three lattice sandwich structures under static compressive response are obtained through finite element simulation analysis, and the experimental result curves are shown in fig. 9.
Fig. 9 is a comparison of the mechanical properties of various structures, here simulated using nylon material. As can be seen from the figure, the traditional BCC rod system lattice structure has sharp corners at nodes, which affects the bearing performance of the whole structure, the elastic modulus is the lowest of the three structures, the subsequent partial data of the compaction part is eliminated, and the compressive strength is only 3.5 MPa; the Gyroid rods of the extremely-small curved surface lattice structure are smoothly transited, the elastic modulus is greatly improved under the condition of the same density, the ultimate compressive strength is improved by 37.7%, and the performance is obviously enhanced; after the damping material is filled, compared with the single extremely small curved surface lattice sandwich structure composite material, the properties of the composite material are not obviously changed in the early stage, but the subsequent stress-strain curve is gradually enhanced, the yield stage of the other two structures does not appear, and the bearing capacity is further enhanced.
In a word, compared with the BCC structure, the performance of the extremely-small curved surface structure is greatly improved, and the performance of the composite structure filled with the damping material is further improved on the basis. Meanwhile, after the damping material is filled, the composite structure has certain vibration damping capacity, the limitation that the traditional vibration damping structure is single in function and difficult to bear is changed, and the multifunctional structure has wider application prospect.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114169023A (en) * | 2021-11-03 | 2022-03-11 | 江苏大学 | A kind of sandwich plate lattice porous structure and design method thereof |
| CN114560063A (en) * | 2022-02-28 | 2022-05-31 | 重庆大学 | Aircraft base with noise reduction performance based on Gyroid structure and its manufacturing method |
| CN114633867A (en) * | 2022-01-24 | 2022-06-17 | 重庆大学 | A steering gear vibration isolation base based on minimal curved lattice structure design and its manufacturing method |
| CN115464156A (en) * | 2022-09-19 | 2022-12-13 | 上海交通大学 | 3D printing copper dual-channel radiator based on TPMS structure and preparation method thereof |
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Application publication date: 20210129 |