CN111844928A - Composite material structure based on vein and honeycomb collaborative bionics and preparation method - Google Patents
Composite material structure based on vein and honeycomb collaborative bionics and preparation method Download PDFInfo
- Publication number
- CN111844928A CN111844928A CN202010543451.5A CN202010543451A CN111844928A CN 111844928 A CN111844928 A CN 111844928A CN 202010543451 A CN202010543451 A CN 202010543451A CN 111844928 A CN111844928 A CN 111844928A
- Authority
- CN
- China
- Prior art keywords
- honeycomb
- vein
- composite material
- collaborative
- bionic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/56—Damping, energy absorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
- B32B2605/08—Cars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
- B32B2605/12—Ships
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
- B32B2605/18—Aircraft
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Data Mining & Analysis (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Operations Research (AREA)
- Probability & Statistics with Applications (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Algebra (AREA)
- Evolutionary Biology (AREA)
- Databases & Information Systems (AREA)
- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- Bioinformatics & Computational Biology (AREA)
- Laminated Bodies (AREA)
Abstract
A composite material structure based on leaf vein and honeycomb collaborative bionics and a preparation method thereof comprise a regular hexagon single-room structure and a composite material laminated plate, wherein a plurality of regular hexagon single-room structures are arranged in a honeycomb shape, and the joint surfaces are shared to form a honeycomb structure; the upper surface and the lower surface of the honeycomb structure are bonded with the composite material laminated plate to form a double-bionic light sandwich structure; the invention applies the honeycomb structure to the structural design of the sandwich composite material by simulating the hexagonal structure of the honeycomb and the distribution rule of leaf veins, and simplifies the structure by converting the three-dimensional structure into an assembled two-dimensional plane structure.
Description
Technical Field
The invention belongs to the field of composite material structure design and manufacture, and particularly relates to a composite material structure based on vein and honeycomb collaborative bionics and a preparation method thereof.
Background
The sandwich structure is formed by bonding two skin panels with high strength and rigidity and a core material which is sandwiched between the two skin panels and has light weight and high thickness. The sandwich structure may be classified into a foam sandwich structure, a corrugated plate sandwich structure, a honeycomb plate sandwich structure, and the like according to the difference in core material between the upper and lower skin panels. The foam sandwich structure has light weight but low strength and cannot be used as a structural part; the sandwich structure of the corrugated plate has high strength, but relatively large mass; the sandwich structure of the honeycomb plate is positioned between the honeycomb plate and the sandwich structure, but when the strength requirement is higher, the integral rigidity of the sandwich structure is improved by increasing the thickness of the honeycomb, namely increasing the volume. The increased volume results in increased weight, while for high speed vehicles, the increased volume of the structural members necessarily squeezes the interior space without changing the exterior aerodynamic profile, resulting in a reduction in load bearing capacity. Therefore, the strength of the core material structure is improved, the volume of the sandwich structure can be effectively reduced, and the integral rigidity of the structure is improved.
Due to the advantages of light weight, high strength, excellent fatigue resistance, excellent corrosion resistance and the like of the composite material, the composite material is widely applied to the fields of the aviation industry, transportation and the like, so the fiber reinforced composite material can be generally used as a skin panel of a sandwich structure, but the fiber reinforced composite material is rarely used for preparing a core material due to the limitation of a forming method and a complex shape. By means of an advanced 3D printing technology of the fiber reinforced composite material, the integrated forming of the complex composite material structural part can be realized. However, the existing research shows that the method still has defects compared with the traditional mature 3D printing technology, and can only realize in-plane printing due to the fact that the support cannot be printed, and meanwhile, the control of the fiber direction in the composite material can only be realized in the plane through a printing path. Therefore, if the fiber reinforced composite material 3D printing technology is directly used for printing the core material, the problems of uncontrollable fiber direction, unreliable later-stage curing quality and the like in the forming process can be caused.
Disclosure of Invention
The invention aims to provide a composite material structure based on vein and honeycomb collaborative bionics and a preparation method thereof, so as to solve the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
A composite material structure based on leaf vein and honeycomb collaborative bionics comprises regular hexagon single-room structures and composite material laminated plates, wherein the regular hexagon single-room structures are arranged in a honeycomb manner, and the joint surfaces are shared to form a honeycomb structure; the upper surface and the lower surface of the honeycomb structure are bonded with the composite material laminated plate to form a double-bionic light sandwich structure;
the regular hexagon single-room structure comprises six leaf vein imitating single-side structures, and the six leaf vein imitating single-side structures enclose a regular hexagon single-room structure.
A preparation method of a composite material structure based on vein and honeycomb collaborative bionics comprises the following steps:
step 1, extracting veins on different plant leaves, and finding out the average value of vein characteristic parameters by a mathematical statistics method;
step 3, applying the vein design rule obtained by extraction to the single-side design of the hexagonal honeycomb structure by using an equal ratio scaling principle;
Step 5, regularly arranging the designed vein-like single-chamber structure in an array manner to form a vein-like and honeycomb-like double bionic structure;
and 6, bonding composite material laminated plates on the upper surface and the lower surface of the structure formed in the step 5 to prepare the double-bionic light interlayer structure.
Further, the composite material is a thermosetting composite material or a thermoplastic composite material.
Further, in step 1, the vein characteristic parameters to be determined are: total height H of veins, bifurcation length Li of each vein, width Di, bifurcation angle ai and bifurcation number n of veins.
Further, in step 3, the specific calculation method in the single-sided design of the hexagonal honeycomb structure is as follows:
i) determining an integral proportion relation: p is H/H;
ii) ensuring that the bifurcation number and the bifurcation angle value of the veins are consistent with the design method of a single-sided structure;
iii) the simulated veins in the single-sided design have a bifurcation length of Li × p and a width of Di × p.
Furthermore, the fiber direction of the composite material is consistent with the bionic vein direction.
Furthermore, the prepared vein-like hexahedron single-room structure can be used independently or a plurality of structures are uniformly and vertically arranged between two plates to form an energy absorption assembly.
Compared with the prior art, the invention has the following technical effects:
The invention applies the honeycomb structure to the structural design of the sandwich composite material by simulating the hexagonal structure of the honeycomb and the distribution rule of leaf veins, and simplifies the structure by converting the three-dimensional structure into an assembled two-dimensional plane structure. Meanwhile, the preparation of the composite material structure is realized by utilizing the 3D printing technology of the fiber reinforced composite material. The preparation method is simple and easy to implement, and the prepared composite sandwich structure has the characteristics of high strength, good energy absorption effect and the like.
Drawings
FIG. 1 is a schematic view of the structure design of a honeycomb group with leaf vein imitation
FIG. 2 is a schematic view of a single-sided structure of an artificial vein
FIG. 3 is a schematic view of the design of a vein-like honeycomb single-cell structure
FIG. 4 is a schematic diagram of vein feature extraction
FIG. 5 is a schematic view of a composite material sandwich structure based on a vein and honeycomb collaborative bionic design
FIG. 6 is a test chart of a double-bionic structure test.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A preparation method of a composite material structure based on vein and honeycomb collaborative bionics comprises the following steps:
1) Referring to fig. 4, the veins on different plant leaves are extracted, and the average value of the characteristic parameters of the veins, such as the total height H of the veins, the bifurcation length Li, the width Di, the bifurcation angle ai, the bifurcation number n of the veins and the like, is found out by a mathematical statistics method.
2) And determining the overall height h of the intermediate sandwich structure according to the design requirement of the honeycomb hierarchical structure.
3) Referring to fig. 2, the leaf vein design rule extracted before is applied to the single-sided design of the hexagonal honeycomb structure by using the equal-ratio scaling principle, and the specific calculation method is as follows:
i) determining an integral proportion relation: p is H/H;
ii) ensuring that the bifurcation number and the bifurcation angle value of the veins are consistent with the design method of a single-sided structure;
iii) the simulated vein bifurcation in the single-sided design has the length of Li multiplied by p and the width of Di multiplied by p
4) Referring to fig. 3, the regular hexagon single-cell structure law in the honeycomb structure is that the designed vein-like single-cell structure is hexagonally arranged based on the minimum stress criterion. And the stress distribution optimization is carried out on the intersection part of the surfaces in the model by adjusting design parameters, so that stress concentration at the connection part of the six surfaces is avoided.
5) Referring to fig. 1, the designed vein-like single-chamber structure is regularly arrayed to finally form a vein-like and honeycomb-like double bionic structure.
6) Referring to fig. 5, the composite material laminated plate is bonded on the upper surface and the lower surface of the structure, and finally the double-bionic light sandwich structure is prepared.
7) The fiber direction of the composite material is kept consistent with the designed bionic vein direction in the preparation process of the structure.
The bionic single-room structure is not limited by the using condition, the description in the specification is only used for illustrating the principle of the bionic single-room structure, the bionic single-room structure can be arranged to form an energy absorption assembly to be applied in the actual using process, and the single bionic single-room structure can be independently used.
Referring to fig. 5, the structure of the composite material comprises regular hexagonal single-room structures and composite material laminated plates, wherein the regular hexagonal single-room structures are arranged in a honeycomb shape, and the connecting surfaces are shared to form a honeycomb structure; the upper surface and the lower surface of the honeycomb structure are bonded with the composite material laminated plate to form a double-bionic light sandwich structure;
the regular hexagon single-room structure comprises six leaf vein imitating single-side structures, and the six leaf vein imitating single-side structures enclose a regular hexagon single-room structure.
Referring to fig. 6, the quasi-static compression mechanical property test is carried out on the prepared double-bionic composite material structure, and the comparison of the test structures shows that the energy absorption and compression resistance performance of the double-bionic composite material structure is obviously superior to that of the traditional polyurethane filling sandwich structure.
Claims (7)
1. A composite material structure based on leaf vein and honeycomb collaborative bionics is characterized by comprising regular hexagonal single-room structures and composite material laminated plates, wherein the regular hexagonal single-room structures are arranged in a honeycomb manner, and the joint surfaces are shared to form a honeycomb structure; the upper surface and the lower surface of the honeycomb structure are bonded with the composite material laminated plate to form a double-bionic light sandwich structure;
the regular hexagon single-room structure comprises six leaf vein imitating single-side structures, and the six leaf vein imitating single-side structures enclose a regular hexagon single-room structure.
2. A preparation method of a composite material structure based on vein and honeycomb collaborative bionics, which is characterized in that the composite material structure based on vein and honeycomb collaborative bionics in claim 1 comprises the following steps:
step 1, extracting veins on different plant leaves, and finding out the average value of vein characteristic parameters by a mathematical statistics method;
step 2, determining the total height h of the middle sandwich structure according to the design requirement of the honeycomb hierarchical structure;
step 3, applying the vein design rule obtained by extraction to the single-side design of the hexagonal honeycomb structure by using an equal ratio scaling principle;
step 4, carrying out hexagonal arrangement on the designed vein-like single-sided structure based on a minimum stress criterion according to a regular hexagonal single-cell structure rule in the honeycomb structure; and performing stress distribution optimization on the intersection part of the surfaces in the model by adjusting design parameters;
Step 5, regularly arranging the designed vein-like single-chamber structure in an array manner to form a vein-like and honeycomb-like double bionic structure;
and 6, bonding composite material laminated plates on the upper surface and the lower surface of the structure formed in the step 5 to prepare the double-bionic light interlayer structure.
3. The method for preparing the composite material structure based on the vein and honeycomb collaborative bionic structure is characterized in that the composite material is a thermosetting composite material or a thermoplastic composite material.
4. The method for preparing the composite material structure based on the synergy of the veins and the honeycomb according to claim 2, wherein in the step 1, the vein characteristic parameters to be determined are as follows: total height H of veins, bifurcation length Li of each vein, width Di, bifurcation angle ai and bifurcation number n of veins.
5. The preparation method of the composite material structure based on the vein and honeycomb collaborative bionic according to claim 2, wherein in the step 3, a specific calculation method in the single-side design of the hexagonal honeycomb structure is as follows:
i) determining an integral proportion relation: p is H/H;
ii) ensuring that the bifurcation number and the bifurcation angle value of the veins are consistent with the design method of a single-sided structure;
iii) the simulated veins in the single-sided design have a bifurcation length of Li × p and a width of Di × p.
6. The method for preparing the composite material structure based on the vein and honeycomb collaborative bionic structure is characterized in that the fiber direction of the composite material is consistent with the bionic vein direction.
7. The preparation method of the composite material structure based on the synergy of the vein and the honeycomb for bionics as claimed in claim 2, characterized in that the prepared vein-like hexahedral single-chamber structure can be used alone or a plurality of structures are uniformly and vertically arranged between two plates to form an energy absorption assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010543451.5A CN111844928B (en) | 2020-06-15 | 2020-06-15 | Composite material structure based on vein and honeycomb collaborative bionics and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010543451.5A CN111844928B (en) | 2020-06-15 | 2020-06-15 | Composite material structure based on vein and honeycomb collaborative bionics and preparation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111844928A true CN111844928A (en) | 2020-10-30 |
| CN111844928B CN111844928B (en) | 2022-02-11 |
Family
ID=72986628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010543451.5A Active CN111844928B (en) | 2020-06-15 | 2020-06-15 | Composite material structure based on vein and honeycomb collaborative bionics and preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111844928B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113653758A (en) * | 2021-08-18 | 2021-11-16 | 北京安达泰克科技有限公司 | Honeycomb structure |
| CN113752668A (en) * | 2021-09-07 | 2021-12-07 | 河北工业大学 | Preparation method of fiber metal laminate with vein bionic negative Poisson's ratio structure |
| CN115072009A (en) * | 2022-06-13 | 2022-09-20 | 南京航空航天大学 | Foot pad support of bionic royal lotus leaf vein structure |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101380832A (en) * | 2008-10-17 | 2009-03-11 | 苏州航通蜂窝科技有限公司 | High intensity lightweight honeycomb core and production method thereof |
| US20130224405A1 (en) * | 2012-02-23 | 2013-08-29 | Lockheed Martin Corporation | Electromagnetic meta-materials |
| KR20150020826A (en) * | 2013-08-19 | 2015-02-27 | 홍성산업 주식회사 | Sandwitch panel having a perforated core element |
| CN108050891A (en) * | 2017-12-19 | 2018-05-18 | 北京理工大学 | A kind of compound sandwich ballistic structure |
| US20180174568A1 (en) * | 2016-12-20 | 2018-06-21 | Airbus Operations Sas | Structure establishing a sound insulator |
| US20180264718A1 (en) * | 2017-03-15 | 2018-09-20 | Carbon, Inc. | Constant force compression lattice |
| CN111055546A (en) * | 2020-01-09 | 2020-04-24 | 三峡大学 | Netted bionic gradient-level honeycomb sandwich structure |
-
2020
- 2020-06-15 CN CN202010543451.5A patent/CN111844928B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101380832A (en) * | 2008-10-17 | 2009-03-11 | 苏州航通蜂窝科技有限公司 | High intensity lightweight honeycomb core and production method thereof |
| US20130224405A1 (en) * | 2012-02-23 | 2013-08-29 | Lockheed Martin Corporation | Electromagnetic meta-materials |
| KR20150020826A (en) * | 2013-08-19 | 2015-02-27 | 홍성산업 주식회사 | Sandwitch panel having a perforated core element |
| US20180174568A1 (en) * | 2016-12-20 | 2018-06-21 | Airbus Operations Sas | Structure establishing a sound insulator |
| US20180264718A1 (en) * | 2017-03-15 | 2018-09-20 | Carbon, Inc. | Constant force compression lattice |
| CN108050891A (en) * | 2017-12-19 | 2018-05-18 | 北京理工大学 | A kind of compound sandwich ballistic structure |
| CN111055546A (en) * | 2020-01-09 | 2020-04-24 | 三峡大学 | Netted bionic gradient-level honeycomb sandwich structure |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113653758A (en) * | 2021-08-18 | 2021-11-16 | 北京安达泰克科技有限公司 | Honeycomb structure |
| CN113653758B (en) * | 2021-08-18 | 2023-03-14 | 北京安达泰克科技有限公司 | Honeycomb structure |
| CN113752668A (en) * | 2021-09-07 | 2021-12-07 | 河北工业大学 | Preparation method of fiber metal laminate with vein bionic negative Poisson's ratio structure |
| CN115072009A (en) * | 2022-06-13 | 2022-09-20 | 南京航空航天大学 | Foot pad support of bionic royal lotus leaf vein structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111844928B (en) | 2022-02-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111844928B (en) | Composite material structure based on vein and honeycomb collaborative bionics and preparation method | |
| CN202177502U (en) | Large aspect ratio wing transonic flutter model | |
| CN110541906B (en) | Double-arrow type negative Poisson ratio structure body | |
| CN111268092B (en) | Structure for improving torsional rigidity of trailing edge structure of flexible wing | |
| CN109501397B (en) | Honeycomb composite material | |
| CN104589731B (en) | Rectangular pyramid resin base truss core foamed composite flat board and manufacture method | |
| CN107423468A (en) | A kind of PRSEUS structure analysis methods based on equivalent method | |
| CN111873558A (en) | Enhanced aramid honeycomb sandwich plate | |
| CN104443346A (en) | Large-deformation composite material with flexible cellular structure and preparation method of large-deformation composite material | |
| CN108345742A (en) | A kind of vibration equivalence modeling method suitable for ripple sandwich structure | |
| CN115355133B (en) | Modularized wide Liang Fengdian blade structure | |
| CN102433969B (en) | Skin structure of composite big plate type square cabin and method for reducing thermal deformation of skin | |
| CN108363835B (en) | Porous sandwich structure based on T-spline surface and application | |
| CN112267955A (en) | Cantilever force bearing device for combined spray pipe | |
| CN110043786B (en) | Improved kagome micro-truss lattice sandwich structure and calculation method thereof | |
| CN202137818U (en) | Deformation-free solid wood board | |
| CN102390129B (en) | Foam interlayer structure compound material and preparation method thereof | |
| CN206903324U (en) | A kind of composite and steel construction mixing super-span storing canopy | |
| CN202925699U (en) | Reinforced thermal insulation board | |
| CN205149038U (en) | Modular paper cellular type core composite sheet | |
| CN207291015U (en) | Composite material " work " shape stringer wall panel structure forming frock | |
| CN208438808U (en) | Composite material and its core material | |
| CN203570771U (en) | Planar finger joint unit | |
| CN113752668B (en) | Preparation method of fiber metal laminate with leaf vein bionic negative poisson ratio structure | |
| CN213329843U (en) | Anti-deformation heat-resistant composite solid wood floor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |