CN202705768U - Intelligent FRP (Fiber Reinforced Plastic) compound rib based on carbon fiber sensing - Google Patents
Intelligent FRP (Fiber Reinforced Plastic) compound rib based on carbon fiber sensing Download PDFInfo
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- CN202705768U CN202705768U CN 201220333731 CN201220333731U CN202705768U CN 202705768 U CN202705768 U CN 202705768U CN 201220333731 CN201220333731 CN 201220333731 CN 201220333731 U CN201220333731 U CN 201220333731U CN 202705768 U CN202705768 U CN 202705768U
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Abstract
The utility model discloses an intelligent FRP (Fiber Reinforced Plastic) compound rib based on carbon fiber sensing. The intelligent FRP compound rib is composed of a long gauge-length carbon fiber sensing core and an outer covering FRP layer, wherein the long gauge-length carbon fiber sensing core is composed of a carbon fiber sensing core semi-finished product, a non-conducting fiber covering layer, a glue-insulating layer and a protecting layer; the carbon fiber sensing core semi-finished product is composed of a carbon fiber and a resin curing layer; an electrode is arranged on the carbon fiber; the non-conducting fiber covering layer is wound on the outer surface of the carbon fiber sensing core semi-finished product; the thickness of the non-conducting fiber covering layer in an electrode position is more than the thickness of the non-conducting fiber covering layer in a non-electrode position; and the glue-insulating layer and the protecting layer are arranged on the outer surface of the non-conducting fiber covering layer in the non-electrode position in turn. The intelligent FRP compound rib provided by the utility model has a distributed stable monitoring property and excellent mechanical property. The production cost of the intelligent FRP compound rib is not obviously higher than the production cost of the common FRP compound rib.
Description
Technical field
The utility model relates to a kind of intelligent FRP composite reinforcing based on the carbon fiber sensing, belongs to the technical field of smart material and structure and sensor monitoring.
Background technology
The plurality of advantages such as continuous fibers strengthens polymer composites (Fiber Reinforced Polymer, FRP) and has that TENSILE STRENGTH height, density are little, specific strength and specific stiffness height, resist chemical, good endurance.Therefore, FRP is considered to replace the good selection of steel in the engineering structures such as building, traffic, ground, have broad application prospects.At present, the fiber that is used for Practical Project mainly contains carbon fiber, glass fibre, spins the multiple fibers such as wheel fiber, basalt fibre, Dyneema fiber, pbo fiber, and fiber and polymer can be combined into muscle material, sheet material and other various forms of section bars.Wherein, the FRP muscle has received researcher's broad research and concern.Domestic, some universities such as Southeast China University, Tsing-Hua University, Tongji University, University of Fuzhou and scientific research institution have launched the research of comparison system to the basic mechanical performance of FRP muscle and the performance that strengthens structure thereof.Yet the FRP material is a kind of anisotropic material, and complete linear elasticity, the multinomial defectives such as shear resistance is relatively poor so the FRP muscle exists, brittle break.The FRP muscle is realized the health monitoring of life cycle management, the security of can its engineering of Effective Raise using, this High-tech Material is with a wide range of applications in Practical Project.
Documents 1(ZL200910026540.6), 2(ZL200910026538.9) and 3(ZL200910027179.3) reported a kind of self-monitoring FRP bar muscle based on distributing optical fiber sensing/rope scale production process, be a patent in fact.The distributed fiberoptic sensor that is based on Brillouin's time domain scattering mechanism that is used for sensing in the documents 1,2 and 3 according to the frequency drift measurement amount strain size of rear scattered light, carries out space orientation according to the time of reception of rear scattered light.But this Distributed Optical Fiber Sensing Techniques need to be separated to be in harmonious proportion with special, high-precision instrument and equipment and analyze, common demodulated equipment is BOTDR, BOTDA or PPP-BOTDA (FBG) demodulator, its price is high, and (price of BOTDR (FBG) demodulator is generally more than 500,000 yuan, PPP-BOTDA (FBG) demodulator price is about 1,500,000 yuan), its operation and analysis also need special technical staff, and instrument relatively heavy, carry inconvenience, limited to a certain extent its popularization and use.Be distributed carbon fiber sensing technology and the utility model is used for sensing, carbon fiber is carbon fiber or the combination of a few specific admixture of the types such as common high strength, middle modulus, high-modulus, and compare sensing with optical fiber very cheap with the price of carbon fiber; Only need to carry out resistance detection with simple resistance test instrument as resistance strain gage commonly used and get final product, not need the high specialized equipment equipment of price, operation is also relative simple with analysis, needs hardly special technical staff, and promotion and use value is wider.In addition, a little less than optical fiber is highly brittle, in process of production very easily fracture, optical fiber is relatively low in the survival rate of certainly monitoring in muscle/rope; And the used carbon fiber of the utility model has high strength, rigidity and other mechanical properties, and corrosion resistance and durability are good, easy fracture not in the production process, and survival rate is high in intelligent FRP composite reinforcing production process.
Carbon fiber not only has the superior mechanical property that surpasses general fibrous material, but also has good electric conductivity and piezoresistive effect.Utilize its electric property can make intelligence sensor, it has been carried out more research both at home and abroad.Such as the beams of concrete distributed monitoring of documents 4(Distributed sensing of RC beams with HCFRP sensors(based on the Farraginous carbon fiber sensing), Caiqian Yang (Yang Caiqian), Zhishen Wu (Wu Zhishen), Lieping Ye (blade row is flat), Proceedings of the SPIE, Vol.5765,2005.5.31, P376-385) reported strain and the concrete cracking of using Farraginous carbon fiber Sensor monitoring beams of concrete, owing to mixed the carbon fiber of low elastic modulus, thereby about 4, the carbon fiber of high-modulus begins to occur fracture behind the 000 μ ε, the precision of monitoring and the degree of accuracy descend obviously, and monitoring after this is mainly take qualitative monitoring as main.
Advance the FRP muscle with distributed long gauge length carbon fiber sensing core is compound, form a kind of intelligent material structure, i.e. intelligent FRP composite reinforcing.Carbon fiber sensing core when using, reality is well protected; simultaneously can carry out effective Real-Time Monitoring to the FRP muscle, greatly improve the safety and reliability of high-new FRP composite material when engineering is used of this high strength, high-durability.
But mainly have the following aspects problem in actual production, in using: (1) carbon fiber in the pultrusion molding process of FRP muscle easily impaired, survival rate is lower, affects the precision of serialization large-scale production and measurement; (2) wire (namely being used for connecting the wire of measurement device) of carbon fiber sensing core is drawn relatively difficulty in the common combination process of FRP material (being that thermosetting is compound); (3) the carbon fiber fibre core is measured the precision that the factors such as carbon fiber strain in the gauge length is inhomogeneous have reduced the distributed sensing test, and sensing core and peripheral fibres existence sliding phenomenon to a certain degree; (4) common moulding process does not carry out pre-stretch-draw, and the not pretensioned carbon fiber usually sensing capabilities before 300 μ ε is poor.
For the problems referred to above, the utility model proposes the long gauge length of carbon fiber (i.e. fixed point), pre-stretch-draw and without slippage laying technology, but the measuring accuracy of Effective Raise distributed sensing carbon fiber.
Yet, always relate to very numerous and diverse artificial treatment in the present various researchs, not only reduced industrialized level, increase production cost, and can affect the yield rate of product and the stability of performance.
The utility model is to be based upon on the basis of mechanization, automatic control, and real meaning realizes the large-scale production based on the intelligent FRP composite reinforcing of carbon fiber distributed sensing.
Summary of the invention
Technical problem: technical problem to be solved in the utility model is for above-mentioned the deficiencies in the prior art; a kind of intelligent FRP composite reinforcing based on the carbon fiber sensing is provided; and on the basis of the production equipment and process of the existing FRP muscle of appropriate reconstruction, develop the intelligent FRP composite reinforcing scale manufacturing technique that is suitable for based on distributed carbon fiber sensing technology.
Technical scheme
The utility model is that the technical scheme that the technical solution problem adopts is:
A kind of intelligent FRP composite reinforcing based on the carbon fiber distributed sensing is comprised of long gauge-length carbon fiber sensing core and outer cladding FRP layer; Wherein long gauge-length carbon fiber sensing core is comprised of carbon fiber sensing core semi-finished product, non-conductive fiber clad, glue partiting layer and protective layer; described carbon fiber sensing core semi-finished product are comprised of carbon fiber and resin solidification layer; be provided with electrode at carbon fiber; described non-conductive fiber clad is wound on carbon fiber sensing core semi-finished product outer surface; and the non-conductive fiber coating thickness at electrode place is greater than the non-conductive fiber clad at non-electrode place, and the non-conductive fiber clad outer surface at non-electrode place sets gradually described glue partiting layer and protective layer.
External coating is infiltrated to solidify through resin by fiber and forms.
The characteristic part of intelligence FRP composite reinforcing is to adopt pre-stretch-draw, long gauge length (glue partiting layer encapsulation) and makes long gauge-length carbon fiber sensing core without sliding technology, process precision and the usability that can significantly improve the carbon fiber sensing through such measure, the self-sensing performance quality of intelligent FRP composite reinforcing depends primarily on the performance quality of long gauge-length carbon fiber sensing core.Prepare the used carbon fiber of long gauge-length carbon fiber sensing core and can be high strength, middle modulus and high modulus carbon fiber, impurity that also can above-mentioned several fibers.Generally, the sensing capabilities of high-strength carbon fiber is better than the sensing capabilities of high modulus carbon fiber; Behind several carbon fiber hybrids, can realize the phase step type sensing.According to different engineering demands, can suitably choose the kind of carbon fiber.
Simultaneously, twine one deck FRP clad in the periphery of sensing core, this FRP layer is main stress layer, and the mechanical property quality of intelligent FRP composite reinforcing mainly depends on the mechanical property of this FRP clad.According to parameter (whether carbon fiber kind, long gauge length wait) and the peripheral FRP clad parameter (kinds of fibers, resin kind etc.) of carbon fiber sensing core, the intelligent FRP composite reinforcing of producing can be divided into a plurality of different series.
The production technology of intelligence FRP composite reinforcing may further comprise the steps:
The installation of the first step, measurement electrode: remove the sizing agent that installs and measures electrode part carbon fiber surface, the polishing metal silk also is coated with conducting resinl, then be fixed on the carbon fiber bundle every a gauge length, make carbon fiber fully contact bonding with wire, and reserve one section wire as terminal;
Second step, the carbon fiber bundle that electrode has been installed is flooded and solidify with resin, form long gauge-length carbon fiber sensing core semi-finished product;
Preparation and the encapsulation of the 3rd step, long gauge-length carbon fiber sensing core: form a FRP clad at long gauge-length carbon fiber sensing core semi-finished product peripheral braiding non-conductive fiber and after with resin-dipping; The thickness that partly weaves in measurement electrode is greater than other parts, the braiding length of electrode part is not less than 20mm, the glue partiting layer of a gauge length of coating between adjacent two electrodes, coat the little barras of elastic modelling quantity or foamed plastics or low elastic modulus fiber in the periphery of glue partiting layer and form protective layer, thereby make long gauge-length carbon fiber sensing core;
The 4th step, long gauge length isolation method manufacturing intelligence FRP composite reinforcing: fiber and long gauge-length carbon fiber sensing core carry out unwrapping wire by yarn axle and carbon fiber axle respectively, wherein fiber imports the abundant impregnating resin of steeping vat, and long gauge-length carbon fiber sensing core drenches glue aloft by drenching the glue hole, then directly clamp-on the pultrusion device via the thermoplastic resin-impregnated fibers of centre bore after being located by the creel boundling of creel, therein extruding is one-step forming just, through certain operation wire stripping is gone out; Just the intelligent FRP composite reinforcing of one-step forming need to be with twining the further threading of a machine and plastic squeeze moulding, enter afterwards the be heating and curing unnecessary resin of pipe removal part, preheating and the moulding that is heating and curing; Finished product intelligence FRP composite reinforcing is gone out production line by the anchor clamps tractive, is placed on the product shelves or directly it is coiled into the muscle dish of certain diameter.
Electrode and wire are with the good copper wire of electric conductivity, aluminium wire or filamentary silver; Measurement electrode is installed with electric conductivity good elargol or copper glue bond, or installs with the method for chemical plating, plating or evaporation.
Employed resin floods the plain edition commercial resin of using, can be fast curing-formed when heating for fibrous material commonly used in the pultrude process.
Long gauge-length carbon fiber sensing core semi-finished product apply pre-stretch-draw more than the 100 μ ε to carbon fiber in preparation process, certain pre-stretch-draw can improve the carbon fiber sensing in sensing stability and the linearity in lower strain area territory.
The non-conductive fiber that long gauge-length carbon fiber sensing core semi-finished product are made usefulness is glass fibre, basalt fibre, aramid fiber, Dyneema fiber, pbo fiber or other non-conductive fibers.
Described glue partiting layer is for preventing that resin immerses the half-finished PVC layer of long gauge-length carbon fiber sensing core or thin wall casing in the FRP muscle pultrusion process, and the length of every section glue partiting layer is decided according to the sensing gauge length, and the length of anchoring section generally is not less than 20mm.
Described protective layer is formed by the low resin of elastic modelling quantity, foamed plastics or low elastic modulus fiber, and the length of protective layer is identical with the length of glue partiting layer.
The outer cladding fiber that intelligence FRP composite reinforcing pultrusion is used can be conducting fibre or dielectric fiber; Fiber adopts gum dipping process, and long gauge-length carbon fiber sensing core adopts and drenches adhesive process.
Measurement electrode and wire are selected the good wire of electric conductivity, such as copper wire, aluminium wire, filamentary silver; Measurement electrode can be installed with electric conductivity good elargol or copper glue bond, also can use the method for chemical plating, plating or evaporation to install.Employed resin is the plain edition commercial resin of fibrous material dipping usefulness commonly used in the pultrude process, can be fast curing-formed when heating.
The major technique key comprises: installation and the protection of (1) measurement electrode are the keys that obtains high measurement accuracy and reliability; (2) long gauge length technology, adopting cleverly glue partiting layer to make becomes uniform stress field in the gauge length, further improve its monitoring accuracy and stability; (3) pre-stretch-draw is processed, utilize the continuous traction system control carbon fiber sensing core of tensioner and high stability and the combined state of fiber in the pultrusion process, and long gauge-length carbon fiber sensing core applied prestressing force more than the 100 μ ε, make carbon fiber sensing core along in the elongated scope of intelligent FRP composite reinforcing accurately, evenly compound, thereby guarantee that intelligent FRP composite reinforcing just has good Monitoring Performance in the small strain scope.
The beneficial effects of the utility model:
1, the utility model is by long gauge length, in advance stretch-draw and process without sliding technology, greatly improved the monitoring accuracy of carbon fiber sensing, promote sensing capabilities and the mechanical property of intelligent FRP composite reinforcing described in the invention, opened up and deepened the practical application of distributed carbon fiber sensing technology.
2, by having strengthened shearing resistance, the resistance to tension of sensing with carbon fiber at the periphery of carbon fiber sensing core braiding non-conductive fiber, the carbon fiber sensor is protected, significantly improved its survival rate in intelligent FRP composite reinforcing production process, both reduced the percent defective that Product industrialization is produced, and reduced again cost, improved the market competitiveness; Simultaneously, make carbon fiber sensing core and periphery be in state of insulation, further improve monitoring stability, the linearity and the precision of intelligent FRP composite reinforcing.
3, adopt the long gauge length isolation method manufacturing intelligence FRP composite reinforcing described in the invention, change little to industrialized producing technology and the equipment of original FRP muscle.Therefore, the sensing of product, the stability of mechanical property have obtained effective guarantee simultaneously, and is smaller to the increase of production cost, has significant added value.Simultaneously, seldom relate to hand labour in the production process, so that this technique has very high industrialized level, guarantee the production efficiency of large-scale production.
4, different according to long gauge-length carbon fiber sensing core and outer cladding FRP layer can be produced the intelligent FRP composite that a plurality of series have different sensing capabilities and mechanical property, such as long gauge length type intelligence FRP composite reinforcing, comprehensive binding type intelligence FRP composite reinforcing etc.
5, than other intelligent material structures, the goods of the utility model production have distributed, stable Monitoring Performance and good mechanical property, and production cost but is not significantly higher than the production cost (the cost raising is no more than 10%) of common FRP muscle.Therefore, have very high cost performance and added value.
6, the intelligent FRP composite reinforcing produced of the utility model is adapted to the demand of present national Large Infrastructure Projects construction and operation, especially can solve the difficult problem of the long term monitoring of the xoncrete structure in the various adverse circumstances, has very high social benefit.
Description of drawings
The long gauge-length carbon fiber sensing of Fig. 1 core semi-finished product.
The long gauge-length carbon fiber sensing of Fig. 2 mandrel is to cutaway view.
The long gauge-length carbon fiber sensing of Fig. 3 core diameter is to cutaway view.
The peripheral clad weaving of Fig. 4 sensing carbon fiber.
Fig. 5 glue partiting layer and protective layer production technology.
The comprehensive bonded carbon fiber of Fig. 6 sensing heart yearn production technology.
Fig. 7 intelligence FRP composite reinforcing.
Fig. 8 intelligence FRP composite reinforcing resolution chart.
Fig. 9 intelligence FRP composite reinforcing production process route figure.
Each several part title: 1 measurement electrode; 2 carbon fibers; 3 resins; 4 long gauge-length carbon fiber sensing core semi-finished product; 5 fibre coatings; 6 glue partiting layers; 7 protective layers; 8 long gauge-length carbon fiber sensing cores; 9 yarn axles; 10 non-conductive fiber yarn axles; 11 non-conductive fibers; 12 boundling braiding machines; 13 pultrusion controllers; 14 electrode treatment process; 15 steeping vats; 16 are heating and curing; 17 glue partiting layer coating machines; 18 protective layer coating machines; 19 yarn axles; 20 fibers; 21 drench the glue hole; 22 screw threads twine; 23 intelligent FRP composite reinforcings; 24 anchor clamps; 25 traction drive systems; 26 product shelves; 27 intelligent production control systems; 28 support platforms; 29 outer cladding FRP layers; 30 girder structures; 31 multichannel resistance measuring instruments; 32 wires.
The specific embodiment
In conjunction with legend, specific implementation process of the present utility model is described in more detail:
Accompanying drawing 7 is the structure chart of the utility model intelligence FRP composite reinforcing 23, simultaneously referring to Fig. 2 and Fig. 3, mainly is made of namely long gauge-length carbon fiber sensing core 8 and outer cladding FRP layer 29 two large divisions.Wherein long gauge-length carbon fiber sensing core 8 is positioned at the centre of intelligent FRP composite reinforcing 23, measurement electrode 1 firmly is anchored in long gauge-length carbon fiber sensing core 8 and is drawn by wire 32, be bonded to integral body with the outer cladding FRP layer of periphery, glue partiting layer is kept apart transducing part gauge length and resin and fiber 20 fully, guarantee the free-extension of long gauge-length carbon fiber sensing core 8 in the gauge length section, in order to form the homogeneous state of stress/strain field.The major function of carbon fiber sensing core is the strain of monitoring intelligent FRP composite reinforcing in loading process and the damage that may occur, and the quality of intelligent FRP composite reinforcing sensing capabilities depends primarily on the making of carbon fiber sensing core; And the Main Function of outer cladding FRP layer is to bear external force, and the mechanical property quality of intelligent FRP composite reinforcing depends primarily on performance and the production technology of outer cladding FRP layer fiber, resin.
Process technology scheme of the present utility model mainly comprises following tetrameric content: installation and the protection of (1) measurement electrode; (2) preparation and the encapsulation of long gauge-length carbon fiber sensing core; (3) long gauge length isolation method manufacturing intelligence FRP composite reinforcing; (4) electrical resistance monitoring of intelligent FRP composite reinforcing.
(1) installation of measurement electrode, protects and draw
At first, remove the sizing agent that installs and measures electrode part carbon fiber surface with means such as organic solvents, improve the electric conductivity between carbon fiber and the carbon fiber, reduce its lateral resistance; Then, wire is polished, purpose is rusty stain and the greasy dirt of removing above it, reduce the contact resistance of itself and conducting resinl and carbon fiber, and the wire after polishing is coated with conducting resinl, then is fixed on the carbon fiber bundle every a gauge length, makes carbon fiber fully contact bonding with wire, and reserve one section wire as terminal, thereby realize the distributed monitoring of carbon fiber sensing core; Conducting resinl can be selected elargol or the copper glue that conducts electricity very well, its effect is the fixation measuring electrode, reduce that carbon fiber reaches with carbon fiber and wire between contact resistance, thereby improve its certainty of measurement.In the pultrusion process, need and to peel off out from intelligent FRP composite reinforcing inside as the wire of conductor part, in order to connect and measure.
(2) preparation of long gauge-length carbon fiber sensing core
Core technology is the long gauge length encapsulation of carbon fiber sensing core, guarantees the carbon fiber sensing core uniform stressed in the sensing gauge length scope, forms uniform stress/strain field.Fig. 1 is the semi-finished product schematic diagram of long gauge-length carbon fiber sensing core, and its making comprises two steps: install and measure electrode at carbon fiber bundle; Then, infiltrate, encapsulate and solidify with resin.Fig. 2, Fig. 3 are the axial and radial cross-section of long gauge-length carbon fiber sensing core, carbon fiber sensing core wherein is long gauge length encapsulation, be that carbon fiber sensing core and outer cladding FRP layer between the per two adjacent measurement electrode is in isolation, after intelligent FRP composite reinforcing was stressed, the strain of carbon fiber sensing core was homogeneous state of strain like this.Its gauge length can design arbitrarily according to actual needs, and generally more the stability of long pass sense is better for gauge length.
The first step, by reference to the accompanying drawings 4, at first installed the carbon fiber sensing core of electrode (long gauge-length carbon fiber sensing core semi-finished product) (Fig. 1) around by the non-conductive fiber 11 of braiding machine 12 braiding one decks, and formation clad 5 with resin-dipping and after solidifying; Not only can make carbon fiber sensing core semi-finished product 4 and exterior insulation, also make carbon fiber sensing core semi-finished product 4 have enough shearing resistances, resistance to tension, in the pultrusion molding process of FRP muscle, can survive.The braiding thickness of electrode part is greater than the braiding thickness of other parts, usually wants more than the thick 0.5mm braiding length of electrode part otherwise less than 20mm.Can increase like this rigidity of electrode part, stressed rear its distortion is little, has improved on the one hand the certainty of measurement of gauge length section carbon fiber sensing core, and is better to the protection of electrode on the other hand.Braiding length and the more large common deformability that more is conducive to improve carbon fiber sensing core and outer cladding FRP layer of thickness of electrode part, the strain of measurement are also got over the logarithmic strain close to intelligent FRP composite reinforcing.
Second step, by reference to the accompanying drawings 5, the goods of the first step directly are interrupted coating one deck glue partiting layer 6 through glue partiting layer coating machine 17.Described glue partiting layer 6 can prevent the coating that resin immerses long gauge-length carbon fiber sensing core semi-finished product 4 in the FRP muscle pultrusion process for PVC layer, thin wall casing or other, and the length of every section glue partiting layer 6 is decided according to the sensing gauge length.
The 3rd step, by reference to the accompanying drawings 5, after having applied glue partiting layer 6 by coating machine 17, by protective layer coating machine 18 coating protective layers 7, the length of protective layer is consistent with the length of glue partiting layer 6.Protective layer 7 can be formed by the low resin of elastic modelling quantity, foamed plastics or low elastic modulus fiber.Low being conducive to of the elastic modelling quantity of protective layer forms uniform stress field in carbon fiber measurement gauge length section, thereby is conducive to improve certainty of measurement and stability.
In addition, for some to monitoring accuracy and the lower situation of stability requirement, can not long gauge length encapsulation, complex manufacturing and cost then can decline to a great extent., form clad 5 and get final product after resin-dipping solidifies directly at the non-conductive fiber 11 of carbon fiber sensing core 4 braiding one decks by braiding machine 12, the braiding thickness of measurement electrode part can be identical with the braiding thickness of other parts, as shown in Figure 6.
(3) long gauge length isolation method manufacturing intelligence FRP composite reinforcing
The method is the industrialized producing technology that above-mentioned long gauge-length carbon fiber sensing core 8 is imported the FRP muscle.Then, utilize the feature of FRP composite anisotropic, directly wire 1 is peeled off out from the FRP muscle.
The key point of this technique: the preparation of long gauge-length carbon fiber sensing core, the installation of many measurement electrode and protection and import FRP muscle pultrusion production line and the drawing of wire.
Fiber 20 and long gauge-length carbon fiber sensing core 8 carry out unwrapping wire by the yarn axle respectively, and wherein fiber 20 imports steeping vat 18 abundant impregnating resin resins and usually selects commercial type thermosetting resin commonly used; And for fear of the bending damage, 8 in long gauge-length carbon fiber sensing core drenches glue aloft by drenching glue hole 19, then directly clamp-on pultrusion device 13' via the thermoplastic resin-impregnated fibers of centre bore after being located by the creel boundling of boundling crochet 12', therein extruding is one-step forming just, and wire stripping is gone out; Just the intelligent FRP composite reinforcing of one-step forming need to be used the further threading of screw thread wrapping machine and plastic squeeze moulding, enters afterwards the pipe 16' that is heating and curing intelligent FRP composite reinforcing is removed the unnecessary resin of part, preheating and the moulding that is heating and curing; Finished product intelligence FRP composite reinforcing is gone out production line by the anchor clamps tractive, is placed on the product shelves or directly it is coiled into the muscle dish of certain diameter.
This production procedure has several passes key control technique:
1, carbon fiber combined state control.In order to improve the measuring accuracy of carbon fiber sensing beam, require the fiber 11 and 20 respectively can be evenly accurately compound with carbon fiber 2 and long gauge-length carbon fiber 8.In order to reach such purpose, on the one hand, can work out installation tension controller on the frame machine at boundling, guarantee that fiber 11 and 20, carbon fiber 2 are identical with the initial tension that long gauge-length carbon fiber sensing core 8 enters the boundling braiding machine; On the other hand, utilize continuous traction system such as the continuous hydraulic trailer system of high stability, comprise anchor clamps 24 and traction drive system 25, guarantee consistent with the combined state of fiber 20 along long gauge-length carbon fiber sensing core 8 in the elongated scope of FRP muscle.
2, the profile of intelligent FRP composite reinforcing control.Different according to purposes, the size of product has different requirements with outer table status.In this technique, the diameter of intelligent FRP composite reinforcing be can control by the internal diameter of boundling braiding machine 12', the dynamics of silk and the dark and pitch of spiral shell that speed can be controlled screw thread twined and twine a machine 22.
3, wire draws.Behind long gauge-length carbon fiber sensing core 8, fiber 11 and fiber 20 process boundling braiding machines 12 and the 12', the wire measurement electrode, can be drawn electrode after peeling off by fiber-covered, and then through twining a machine 22 rag moulding.
(4) electrical resistance monitoring of intelligent FRP composite reinforcing
As shown in Figure 8, the resistance measurement of each gauge length section is mainly passed through in the monitoring of this intelligence FRP composite reinforcing, the measure traverse line of intelligence FRP composite reinforcing is connected to multichannel resistance measuring instrument 31 by wire 32, then can obtain the strain size of intelligent FRP composite reinforcing according to the resistance change rate of surveying and sensitivity coefficient.Girder structure 30 is subjected to different power effects, but what measure in each gauge length scope is average resistance rate of change (mean strain) in this scope; Average resistance rate of change (mean strain) in the different measuring gauge length is relevant with the stressed size in this gauge length, and stressed greatly then average resistance rate of change (mean strain) is large, and is stressed little then little.
Claims (2)
1. the intelligent FRP composite reinforcing based on the carbon fiber sensing is characterized in that: be comprised of long gauge-length carbon fiber sensing core (8) and outer cladding FRP layer (29); Wherein long gauge-length carbon fiber sensing core (8) is by carbon fiber sensing core semi-finished product (4); non-conductive fiber clad (5); glue partiting layer (6) and protective layer (7) form; described carbon fiber sensing core semi-finished product (4) are comprised of carbon fiber (2) and resin solidification layer; be provided with electrode (1) at carbon fiber (2); described non-conductive fiber clad (5) is wound on carbon fiber sensing core semi-finished product (4) outer surface; and non-conductive fiber clad (5) thickness that electrode (1) is located is greater than the non-conductive fiber clad (5) at non-electrode place, and non-conductive fiber clad (5) outer surface at non-electrode place sets gradually described glue partiting layer (6) and protective layer (7).
2. the intelligent FRP composite reinforcing based on the carbon fiber sensing according to claim 1 is characterized in that: external coating (29) is infiltrated to solidify through resin (3) by fiber (20) and forms.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797185A (en) * | 2012-07-10 | 2012-11-28 | 东南大学 | Intelligent FRP (Fiber Reinforced Polymer) composite rib based on carbon fiber distribution type sensing and large-scale production process thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797185A (en) * | 2012-07-10 | 2012-11-28 | 东南大学 | Intelligent FRP (Fiber Reinforced Polymer) composite rib based on carbon fiber distribution type sensing and large-scale production process thereof |
| CN102797185B (en) * | 2012-07-10 | 2014-12-10 | 东南大学 | Intelligent FRP (Fiber Reinforced Polymer) composite rib based on carbon fiber distribution type sensing and large-scale production process thereof |
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