CN114851607A - Method for integrating optical fibers by composite material structure - Google Patents
Method for integrating optical fibers by composite material structure Download PDFInfo
- Publication number
- CN114851607A CN114851607A CN202210418037.0A CN202210418037A CN114851607A CN 114851607 A CN114851607 A CN 114851607A CN 202210418037 A CN202210418037 A CN 202210418037A CN 114851607 A CN114851607 A CN 114851607A
- Authority
- CN
- China
- Prior art keywords
- composite material
- optical fiber
- material structure
- prepreg
- optical fibers
- 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.)
- Pending
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 106
- 239000002131 composite material Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000002313 adhesive film Substances 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 239000003292 glue Substances 0.000 claims abstract description 12
- 239000010410 layer Substances 0.000 claims abstract description 10
- 239000011247 coating layer Substances 0.000 claims abstract description 6
- 238000013461 design Methods 0.000 claims abstract description 6
- 238000007781 pre-processing Methods 0.000 claims abstract description 4
- 238000005452 bending Methods 0.000 claims description 6
- 238000004026 adhesive bonding Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 9
- 239000000835 fiber Substances 0.000 abstract description 9
- 238000002513 implantation Methods 0.000 abstract description 4
- 238000012546 transfer Methods 0.000 abstract description 3
- 230000036541 health Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012783 reinforcing fiber Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229920006335 epoxy glue Polymers 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00663—Production of light guides
-
- 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
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
Abstract
The invention discloses a method for integrating optical fibers by using a composite material structure, which comprises the following steps: 1) preparing a composite structure composed of prepreg; 2) preprocessing a composite material structure; 3) selecting an optical fiber with a high-temperature-resistant coating layer as a sensor, temporarily fixing the optical fiber by using glue, and laying the optical fiber on the surface of the composite material structure according to a layout design; 4) covering the temporarily fixed optical fiber with a glue film; 5) heating the adhesive film by a heating device to make the adhesive film have viscosity and can be temporarily fixed on the composite material structure; 6) covering a layer of prepreg with the same structure as the composite material on the adhesive film; 7) and (3) carrying out secondary high-temperature high-pressure curing on the composite material structure with the optical fiber laid according to the curing process of the prepreg, thus obtaining the optical fiber composite material. The optical fiber integrated subsequently does not influence the structural strength performance, the direction of the optical fiber and the direction of the fiber in the prepreg can be adjusted at will, and the strain transfer efficiency is improved; simultaneously has the advantages of surface pasting and internal implantation.
Description
Technical Field
The invention relates to the technical field of composite material mechanisms, in particular to a method for integrating optical fibers by using a composite material structure.
Background
The composite material has high specific modulus and specific strength, is more and more widely applied to aerospace structures, and brings the benefit of great weight reduction for aircrafts. However, the composite material structure is easy to be damaged by layering, degumming, crushing and the like due to manufacturing defects or impact and the like, so that the flight safety is reduced and the maintenance cost is increased. Researchers integrate a sensor network in a composite material structure, perform online health monitoring and timely find damage so as to improve flight safety and reduce maintenance time and cost. The optical fiber has wide application prospect in the health monitoring of composite structures by virtue of the advantages of thinness, light weight, high temperature and high pressure resistance, corrosion resistance, no electromagnetic interference, distributed measurement and the like.
At present, the mode of integrating the optical fiber by the composite material structure is mainly divided into surface pasting and internal implantation. (1) The optical fiber is adhered to the surface of the structure by using glue such as epoxy glue after the composite material structure is manufactured, the method has the advantages of flexible arrangement, convenient replacement, no influence on the strength performance of the structure and the like, but has the defects that the optical fiber is easily degummed or damaged when exposed in the environment, the optical fiber is not tightly combined with the structure, and the strain transfer is poor. (2) The latter is in the manufacturing process of the composite material structure, lay the optic fibre in the prepreg interlaminar, or weave the optic fibre into the fibrous reinforcement and pour resin again, solidify and shape finally, the advantage of this method is that the optic fibre is not damaged by the environmental impact, and the optic fibre is combined with the structure closely, the strain transfer is good, but the disadvantage is that the diameter of optic fibre is greater than the reinforcing fiber, equivalent to impurity, will influence the strength performance of the structure, especially when the direction of laying optic fibre is perpendicular to direction of reinforcing fiber, influence the maximum, so the direction of laying of optic fibre is limited. Both methods have certain defects, and the engineering application of optical fiber sensing in the composite material structure health monitoring is greatly limited.
Disclosure of Invention
The invention aims to provide a method for integrating optical fibers by using a composite material structure, which uses an adhesive film for secondary curing and has two advantages of surface adhesion and internal implantation.
The invention is realized by the following technical scheme: a method of integrating optical fibers in a composite structure, comprising the steps of:
(1) preparing a composite structure composed of prepreg;
(2) preprocessing a composite material structure;
(3) selecting an optical fiber with a high-temperature-resistant coating layer as a sensor, temporarily fixing the optical fiber by using glue, and laying the optical fiber on the surface of the composite material structure according to a layout design;
(4) covering the temporarily fixed optical fiber with an adhesive film;
(5) heating the adhesive film by using a heating device to make the adhesive film have viscosity and can be temporarily fixed on the composite material structure;
(6) covering a layer of prepreg with the same structure as the composite material on the adhesive film;
(7) and (3) carrying out secondary high-temperature high-pressure curing on the composite material structure with the optical fiber laid according to the curing process of the prepreg, thus obtaining the optical fiber composite material.
In order to better implement the present invention, further, in step (1), the composite structure is prepared by a method of laying prepregs and then curing the prepregs at high temperature and high pressure.
In order to better implement the present invention, further, in step (2), the pretreatment process for the composite material structure is as follows: and cleaning and polishing one surface of the composite material structure, which is to be paved with the optical fiber.
In order to better implement the present invention, further, in the step (3), the temperature that the selected optical fiber with the high temperature resistant coating layer can bear is higher than the curing temperature of the prepreg used for the composite material structure.
In order to better implement the present invention, further, in step (3), the concrete process of laying the temporary fixing pipeline on the surface of the composite structure includes: when the optical fiber is laid, the curvature radius of the bent part of the optical fiber is required to be larger than the bending radius suggested by the used optical fiber so as to reduce the bending loss of the optical fiber; cutting a prepreg which is the same as that used for the composite material structure at the intersection of the optical fibers, and cushioning the prepreg at the intersection to avoid breaking the optical fibers by high pressure; the whole section of optical fiber is not fixed during gluing, and for the optical fiber which is laid in a straight line, the first point and the last point of the straight line are fixed by using glue; for the optical fiber laid in a turn, only two points at the beginning and the end of an arc need to be fixed, and the optical fiber can be naturally in an arc due to the tension.
In order to better implement the present invention, further, in the step (3), the layout design of laying the optical fibers on the surface of the composite material structure needs to minimize the situation of optical fiber crossing.
In order to better implement the present invention, further, the adhesive film selected in the step (4) is an adhesive film with a curing temperature lower than the curing temperature of the prepreg, and the curing temperature difference is not greater than 5 ℃.
In order to better implement the present invention, further, in the step (5), the heating device used is a heat radiation lamp.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) according to the invention, the manufactured composite material structure is used for realizing the integration of the optical fiber, the environment of the optical fiber signal is not influenced, the strength performance of the structure cannot be influenced by the subsequently integrated optical fiber, and the direction of the optical fiber and the direction of the fiber in the prepreg can be randomly adjusted without limitation;
(2) according to the invention, the optical fiber and the composite material structure are tightly combined through the glue film covered on the optical fiber, so that the strain transmission efficiency can be increased, and the optical fiber layer can be protected after the last layer of covered prepreg is hardened, so that the optical fiber is prevented from being easily degummed or damaged when exposed to the environment;
(3) the method for integrating the optical fiber has the advantages of two schemes of surface adhesion and internal implantation, has simple steps and obvious effect, does not limit the engineering application of optical fiber sensing in the composite material structure health monitoring any more, and has good market prospect.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of the lay-up structure of the present invention.
Wherein: 1-composite material structure, 2-lower layer optical fiber, 3-upper layer optical fiber, 4-small prepreg, 5-adhesive film and 6-prepreg.
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 reference numerals refer to the same or similar elements or elements having the same or similar functions 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.
Example 1:
the embodiment provides a method for integrating an optical fiber with a composite material structure, a specific structure of the integrated optical fiber is shown in fig. 1, and a specific process includes the following steps:
(1) preparing a composite structure 1 composed of prepreg;
(2) preprocessing the composite material structure 1;
(3) selecting an optical fiber with a high-temperature-resistant coating as a sensor, temporarily fixing the optical fiber by using glue, laying the optical fiber on the surface of the composite material structure 1 according to the layout design, wherein a small prepreg 4 which is the same as that used by the composite material structure 1 is cut at the intersection of the optical fiber, and is padded at the intersection of the upper layer optical fiber 2 and the lower layer optical fiber 3 to avoid breaking the optical fiber under high pressure; (ii) a
(4) Covering the temporarily fixed optical fiber with an adhesive film 5;
(5) heating the adhesive film 5 by using a heating device to make the adhesive film 5 have viscosity and can be temporarily fixed on the composite material structure 1;
(6) covering a layer of glue film 5 with prepreg 6 which is the same as the composite material structure 1;
(7) and (3) carrying out secondary high-temperature high-pressure curing on the composite material structure 1 with the optical fibers according to the curing process of the prepreg 6.
Example 2:
this embodiment further defines the specific process of step (1) on the basis of the above embodiments, and in step (1), the specific process of preparing the composite structure is to prepare the composite structure by using a method of laying prepregs and then curing the prepregs at high temperature and high pressure. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
Example 3:
in this embodiment, on the basis of the above embodiment, a specific process of step (2) is further defined, where in step (2), the pretreatment process for the composite material structure is as follows: and cleaning and polishing one surface of the composite material structure, which is to be paved with the optical fiber. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
Example 4:
in this embodiment, based on the above embodiment, the selection of the optical fiber is further limited, and in the step (3), the selected optical fiber having the high temperature resistant coating layer can withstand a temperature higher than a curing temperature of the prepreg used for the composite material structure. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
Example 5:
in this embodiment, on the basis of the above embodiment, a specific process of step (3) is further defined, where in step (3), the specific process of laying the temporary fixing pipeline on the surface of the composite structure is as follows: when the optical fiber is laid, the curvature radius of the bent part of the optical fiber is required to be larger than the bending radius suggested by the used optical fiber so as to reduce the bending loss of the optical fiber; cutting a prepreg which is the same as that used for the composite material structure at the intersection of the optical fibers, and cushioning the prepreg at the intersection to avoid breaking the optical fibers by high pressure; the whole section of optical fiber is not fixed during gluing, and for the optical fiber which is laid in a straight line, the first point and the last point of the straight line are fixed by using glue; for the optical fiber laid in a turn, only two points at the beginning and the end of an arc need to be fixed, and the optical fiber can naturally form an arc due to tension. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
Example 6:
in this embodiment, in addition to the above-mentioned embodiments, the attention of step (3) is further limited, and in step (3), the layout design of the optical fibers laid on the surface of the composite material structure needs to minimize the crossing of the optical fibers. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
Example 7:
in this embodiment, a specific process of the step (4) is further defined on the basis of the above embodiment, and the adhesive film selected in the step (4) is an adhesive film with a curing temperature lower than the curing temperature of the prepreg, and the curing temperature difference is not greater than 5 ℃. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
Example 8:
this embodiment further defines the selection of the heating device on the basis of the above embodiment, and in the step (5), the heating device used is a heat radiation lamp. Other heating devices capable of large-scale and small-amplitude heating can be selected. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
While embodiments of the 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 these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A method for integrating optical fibers in a composite structure, comprising the steps of:
(1) preparing a composite structure composed of prepreg;
(2) preprocessing a composite material structure;
(3) selecting an optical fiber with a high-temperature-resistant coating layer as a sensor, temporarily fixing the optical fiber by using glue, and laying the optical fiber on the surface of the composite material structure according to a layout design;
(4) covering the temporarily fixed optical fiber with a glue film;
(5) heating the adhesive film by using a heating device to make the adhesive film have viscosity and can be temporarily fixed on the composite material structure;
(6) covering a layer of prepreg with the same structure as the composite material on the adhesive film;
(7) and (3) carrying out secondary high-temperature high-pressure curing on the composite material structure with the optical fiber laid according to the curing process of the prepreg, thus obtaining the optical fiber composite material.
2. The method for integrating optical fibers into a composite material structure according to claim 1, wherein in the step (1), the composite material structure is prepared by a method of laying prepregs and then curing the prepregs at high temperature and high pressure.
3. The method for integrating optical fiber with composite material structure according to claim 1 or 2, wherein in the step (2), the pretreatment process for the composite material structure is as follows: and cleaning and polishing one surface of the composite material structure, which is to be paved with the optical fiber.
4. The method for integrating optical fibers into a composite material structure according to claim 1 or 2, wherein in the step (3), the optical fibers with the high temperature resistant coating layer are selected to be capable of withstanding a temperature higher than a curing temperature of a prepreg used for the composite material structure.
5. The method for integrating optical fibers into a composite material structure according to claim 1 or 2, wherein in the step (3), the temporary fixing pipeline is laid on the surface of the composite material structure by a specific process of: when the optical fiber is laid, the curvature radius of the bent part of the optical fiber is required to be larger than the bending radius suggested by the used optical fiber so as to reduce the bending loss of the optical fiber; cutting a piece of prepreg which is the same as that used for the composite material structure at the cross point of the optical fiber, and cushioning the prepreg at the cross point to avoid breaking the optical fiber under high pressure; the whole section of optical fiber is not fixed during gluing, and for the optical fiber which is laid in a straight line, the first point and the last point of the straight line are fixed by using glue; for the optical fiber laid in a turn, only two points at the beginning and the end of an arc need to be fixed, and the optical fiber can be naturally in an arc due to the tension.
6. A method for integrating optical fibers in a composite material structure according to claim 1 or 2, wherein in the step (3), the layout of the optical fibers laid on the surface of the composite material structure needs to minimize the crossing of the optical fibers.
7. The method for integrating optical fibers into a composite material structure according to claim 1 or 2, wherein the selected adhesive film in the step (4) is an adhesive film with a curing temperature lower than that of the prepreg, and the curing temperature difference is not more than 5 ℃.
8. A method for integrating optical fibers in a composite material structure according to claim 1 or 2, wherein the heating device used in step (5) is a heat radiation lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210418037.0A CN114851607A (en) | 2022-04-21 | 2022-04-21 | Method for integrating optical fibers by composite material structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210418037.0A CN114851607A (en) | 2022-04-21 | 2022-04-21 | Method for integrating optical fibers by composite material structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114851607A true CN114851607A (en) | 2022-08-05 |
Family
ID=82631931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210418037.0A Pending CN114851607A (en) | 2022-04-21 | 2022-04-21 | Method for integrating optical fibers by composite material structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114851607A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116447994A (en) * | 2023-04-07 | 2023-07-18 | 成都飞机工业（集团）有限责任公司 | Method for measuring strain distribution in coating curing process |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4936649A (en) * | 1989-01-25 | 1990-06-26 | Lymer John D | Damage evaluation system and method using optical fibers |
| US5292390A (en) * | 1992-09-30 | 1994-03-08 | At&T Bell Laboratories | Optical fiber encapsulating techniques |
| JPH10160974A (en) * | 1996-12-02 | 1998-06-19 | Hitachi Cable Ltd | Optical fiber array |
| CN1752784A (en) * | 2005-11-04 | 2006-03-29 | 哈尔滨工业大学 | Method of protecting inlet and outlet of optical fiber intelligent composite material |
| CN107503525A (en) * | 2017-08-04 | 2017-12-22 | 山东大学 | A kind of built-in intelligent composite of high-performance optical fiber and preparation method thereof |
| CN109278395A (en) * | 2018-09-11 | 2019-01-29 | 山东大学 | Composite material sandwich structure, the monitoring system and method for interplantation fiber grating |
-
2022
- 2022-04-21 CN CN202210418037.0A patent/CN114851607A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4936649A (en) * | 1989-01-25 | 1990-06-26 | Lymer John D | Damage evaluation system and method using optical fibers |
| US5292390A (en) * | 1992-09-30 | 1994-03-08 | At&T Bell Laboratories | Optical fiber encapsulating techniques |
| JPH10160974A (en) * | 1996-12-02 | 1998-06-19 | Hitachi Cable Ltd | Optical fiber array |
| CN1752784A (en) * | 2005-11-04 | 2006-03-29 | 哈尔滨工业大学 | Method of protecting inlet and outlet of optical fiber intelligent composite material |
| CN107503525A (en) * | 2017-08-04 | 2017-12-22 | 山东大学 | A kind of built-in intelligent composite of high-performance optical fiber and preparation method thereof |
| CN109278395A (en) * | 2018-09-11 | 2019-01-29 | 山东大学 | Composite material sandwich structure, the monitoring system and method for interplantation fiber grating |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116447994A (en) * | 2023-04-07 | 2023-07-18 | 成都飞机工业（集团）有限责任公司 | Method for measuring strain distribution in coating curing process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103628697B (en) | The continuously shaped intelligent plate of fiber grating fibre reinforced composites pultrusion | |
| CN101597869B (en) | Process for mass-producing distributed high-accuracy self-monitoring fiber reinforced polymer (FRP) bars/cables on basis of fiber-optic sensing | |
| CN114851607A (en) | Method for integrating optical fibers by composite material structure | |
| CN101707077A (en) | Intelligent composite core for manufacturing overhead power transmission aluminum stranded wire | |
| CN110360389B (en) | Composite material pipeline and conveying pipeline expand by pulling | |
| CN105464898A (en) | Rotor blade structure of wind turbine and preparation method of rotor blade structure | |
| CN110452496A (en) | A kind of modified glass-fiber reinforced resin laminate and preparation method thereof | |
| CN103261286A (en) | Composites having distortional resin coated fibers | |
| CN110208903B (en) | Impact-resistant optical fiber image transmission element and preparation method thereof | |
| CN103075580A (en) | Continuous fiber reinforced thermoplastic composite high-pressure pipeline | |
| CN106273540B (en) | A kind of processing method of the buried RPM of heavy caliber | |
| CN205423056U (en) | Sectional type wind -powered electricity generation blade | |
| CN112782818A (en) | Easy-to-peel flat branch remote optical cable | |
| CN115262862B (en) | Steel-continuous fiber composite intelligent bar with sheath optical cable embedded in inner core of steel bar and preparation method thereof | |
| CN208566156U (en) | A kind of FRP sand tube and glass fiber reinforced plastic sand-inclusion pipeline system | |
| CN207937659U (en) | High temperature resistant optical cable | |
| CN116330712A (en) | Carbon fiber composite T-shaped joint and preparation method thereof | |
| CN109870256B (en) | Self-monitoring DOFS (degree of freedom) -FRP (fiber reinforced plastic) cloth and monitoring method thereof | |
| CN203742192U (en) | Fiber bragg grating fiber reinforced polymer continuous-pultrusion formed intelligent board | |
| CN106154466A (en) | One can etch-proof wear-resistant optical cable | |
| CN203720422U (en) | Optical fiber cable for micro-trench of road surface | |
| CN205592518U (en) | Bushing pipe in solidification of seamless individual layer upset inside lining normal position | |
| CN2615230Y (en) | Fiber reinforced plastics-optical fiber grating composite intelligent ribs | |
| CN101634736A (en) | Application of non-woven tape | |
| CN104900320A (en) | Super-flexible twisted-type carbon fiber composite core for smart energy, and manufacturing method for super-flexible twisted-type carbon fiber composite core |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220805 |