CN103954743A - Vacuum assisted resin infusion fabric compacting characteristic and permeability performance integrated testing device - Google Patents
Vacuum assisted resin infusion fabric compacting characteristic and permeability performance integrated testing device Download PDFInfo
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Abstract
The invention provides a vacuum assisted resin infusion fabric compacting characteristic and permeability performance integrated testing device. The invention for the first time provides a fabric compacting characteristic and permeability performance integrated testing idea in vacuum assisted resin infusion, the device is capable of performing integrated experiment test of fabric compacting characteristic and permeability performance, and is capable of accurately researching the influence factors such as compacting strength, compacting time and cycle loading, fabric layers and fabric braiding methods on the compacting characteristic under a dry state and a moisture state of the fabric, and is capable of testing permeability of the fabric in plane and thickness direction. The device can realize the test for the fabric performance under same condition of the vacuum assisted resin infusion, employs a self-designed negative pressure controller, a pressure tester and an eddy current displacement sensor can realize automatic control of various influence factors, and can obviously increase the experiment efficiency of the fabric compacting characteristic and permeability performance test and can optimize the test cost.
Description
Technical field
The present invention relates to compactingproperties and the permeability properties integrated test electricity testing device of fabric in a kind of vacuum assistant resin infused, specifically a kind of fiber grating test and Pressure Control Technology, in polymer matrix composites material vacuum assistant resin infused manufacture method, are tested at technique compactingproperties and permeability properties perform manufacturing.Particularly relate in the compactingproperties of a kind of fabric under dry state and hygrometric state situation and face and thickness direction permeability properties is carried out the device of integrated testing.
Background technology
The vacuum assistant resin infused of carbon fiber enhancement resin base composite material is low with cost, be easy to manufacture large-size components, has been widely used in Aero-Space, auto industry and ship domain.The compactingproperties of fabric and permeability properties are two important technological parameters in vacuum assistant resin infused, compactingproperties is to characterize the thickness of fabric preform or the variation relation of fiber volume fraction under pressure-acting, it is relevant with factors such as compaction force size, compacting time, CYCLIC LOADING, fabric layers and weaving manners, and the thickness to composite material structural member or fiber volume fraction distribute and mechanical property has material impact.Permeability is to characterize the parameter that infiltrates fluid mobile complexity in porous medium under pressure-acting, embodies the resistance to flow size of porous medium convection cell.Increase in the manufacture process of vacuum assistant resin infused of polymer matrix composites at continuous fiber, the permeability of fiber is the key factor that affects resin flows state, it is determined by the physical characteristics of fiber and the inner structure of fiber mesh, simultaneously also relevant to the wet face state of fiber with physical characteristics, flow direction and the resin of resin.
The compactingproperties of fabric and permeability properties are to adopt vacuum assistant resin infused successfully to manufacture the important parameter of high-performance composite materials, are also that composite material shaping process computer mould fits requisite input parameter in optimization design.The manufacturing process finite element analogy of compound substance has in the last few years become the focus of field of compound material research, setting up reliable compactingproperties and permeability properties proving installation accurate, high efficiency, low cost is the important prerequisite that obtains the accurate parameter of fabric performance, is also one of precondition ensureing analog result accuracy.Often need adopt different experimental provisions to test for the research of fabric compactingproperties and permeability properties test at present, the report that two kinds of performance tests are carried out to integrated testing is not seen.At present existing research has for the method for the research of fabric compactingproperties: (1) is placed on fabric in rigid RTM die cavity, directly controls compaction force by omnipotent mechanical test machine and applies process and test; Investigate compacting time and the impact of compaction force size on compactingproperties by setting program, but in this method of testing and actual process, compaction force is not inconsistent on fabric experiment condition by flexible vacuum bag membrane action; (2) also there is bibliographical information to adopt vacuum bag molding to carry out experimental study to the compactingproperties of fabric in vacuum assistant resin infused, but experimentation is to the controlling party of the influence factors such as compaction force and compacting time to simple and crude, and the randomness of experimentation has reduced the accurate reliability of experimental result; 3) existing research is studied often by well-separated to dry state and hygrometric state compacting for fabric compactingproperties in vacuum assistant resin infused, in this and actual vacuum assistant resin infused, dry state/hygrometric state compacting process continuity of fabric does not meet, and can not observe the important mechanism of caliper variation in fabric pressing true property---the lubricating effect of resin.The test of the permeability of fabric is existing relevant report in correlative study, according to Darcy's law fabric pentration rate can by resin flows forward over time relation calculate.Therefore mainly concentrate in resin flows forward's monitoring for the method for testing of fabric pentration rate, the research of this respect has more document, conventional research method mainly contains: 1) camera video recording method, this is the widely used monitoring resin flows forward position method of relation in time, the method simple operation simple but in the time of data processing trouble and experiment accuracy poor; 2) pressure transducer method, there is researchist to adopt the experimental provision of designed, designed, adopt at the radial pressure transducer of the equidistant laying in device bottom surface and monitor flow fronts relation in time, when resin flow during through somewhere pressure transducer can collect resin pressure signal, and then obtain the variation relation of resin flows forward and time by pressure signal modulating system, this method has simple to operate and can obtain experimental result comparatively accurately, but experiment scale removal process complexity and experimental provision processing charges costliness; 3) fiber-optic grating sensor method, it is the new development that is used in recent years monitoring resin flows forward method, method is utilized fiber-optic grating sensor high sensitivity and the advantage such as antijamming capability is strong, adopts the fiber-optic grating sensor of multiple-grid point to be laid immediately on fabric inside.In the time of resin flows forward process position, place, fiber grating place, infiltrate the variation that the temperature of resin and the difference of fabric temperature can produce optic fiber grating wavelength, the fiber-optic grating sensor of customizable different pitch and many optical grating points is to increase the precision of test, the method can significantly improve the precision of experimental result, but the easy brittle failure of fiber-optic grating sensor and high customization cost have increased cost.As can be seen here, fabric permeability method of testing conventional and immediate development exists the problem of the not high and high testing cost of precision, in vacuum assistant resin infused, fabric compactingproperties and permeability properties integrated test electricity testing device have been realized fabric compactingproperties and permeability properties integration testing, not only there is important using value, and thering is certain technical difficulty, the impact that need to take into account many factors could realize accurately measures.
Summary of the invention
The object of the present invention is to provide fabric compactingproperties and permeability properties integrated test electricity testing device in a kind of fiber-reinforced resin matrix compound material vacuum assistant resin infused, specifically a kind of being applied in conjunction with noncontact eddy displacement sensor technology based on Fiber Bragg Grating FBG in the compactingproperties and permeability properties integrated testing of fabric, in the thickness to fabric, suffered compaction force, face and the key process parameter such as thickness direction permeability carry out the accurately device of test.
The object of the present invention is achieved like this: this proving installation by control pressurer system, fabric performance test device, fabric thickness measuring system, fabric pressure testing system, hold and infiltrate beaker and the host computer of liquid and form, control pressurer system links together by resin mozzle and fabric performance testing device, fabric thickness measuring system is passed through to adopt nut to be connected with fabric performance testing device at aluminium sheet crossbeam upper and lower, and is connected with host computer by usb data connecting line.Fabric pressure testing system is fixed on fabric performance testing device by sunk screw, and is connected with host computer by usb data connecting line.Control pressurer system is made up of vacuum pump, negative pressure controller and resin trap, vacuum pump is connected with the gas outlet of negative pressure controller by vacuum hose, the air intake opening of negative pressure controller is connected with the resin trap gas outlet of resin trap by vacuum hose, the air intake opening of resin trap is connected with the exit portal of fabric performance testing device by mozzle, and the pressure vacuum gauge of resin trap is used for procedure for displaying force value.Fabric performance testing device is by aluminium horizontal board mold, stainless steel column, the middle aluminium sheet crossbeam with through-hole groove of aluminium alloy, center injection mouth joint composition, flat aluminium alloy plate die face is processed with surrounding groove for lay fluid sealant, be processed with respectively exit portal and injection port at length direction two ends, be processed with step cutting pattern at length center position, when carrying out dry state, when hygrometric state compacting and the test of face intrinsic permeability, adopt matching size stainless steel circular slab not with holes and adopt sealant sealing, while carrying out the test of thickness direction permeability properties, adopt the stainless steel circular slab with holes of matching size and adopt sealant sealing.In length direction center line symmetric position, be processed with two square steps, on step, two ends are processed with respectively two threaded holes, be processed with transition groove and extend to the surrounding groove of die edge along two square step centerline, on flat aluminium alloy plate die width direction center line, process two threaded holes in order to lay the middle aluminium sheet crossbeam with through-hole groove of the aluminium alloy being just placed in above fabric performance testing device, and adopt upper lower nut to be fixed on aluminium sheet crossbeam.Fabric thickness measuring system is made up of eddy displacement sensor, displacement signal amplifier and displacement signal modulator-demodular unit, eddy displacement sensor is connected with displacement signal amplifier by the data connecting line of coupling, displacement signal amplifier adopts the data connecting line of coupling to be connected with displacement signal modulator-demodular unit, and displacement signal modulator-demodular unit is finally connected with host computer by usb data connecting line.Fabric pressure testing system is by aluminium alloy sheet, sunk screw, the special adhesive of fiber grating, fiber-optic grating sensor, fiber-optic signal modulator-demodular unit composition, aluminium alloy sheet is riveted on by sunk screw in the countersunk head screw on the square step of aluminum alloy mould of fabric Testing Platform, fiber-optic grating sensor is by adopting the special adhesive of fiber grating to be bonded in Width center, the aluminium alloy sheet back side, fiber-optic grating sensor extends to surrounding groove along the transition groove at the positive place of aluminum alloy mould, modulating connecting line by optical fiber is connected with the fiber grating signal interface channel of fiber-optic signal modulator-demodular unit, fiber-optic signal modulator-demodular unit is connected with host computer by usb data connecting line, obtain displacement signal change information by supporting acquisition software.
In the present invention, be placed on fabric performance test device eddy displacement sensor just above and in the test experiments of fabric compactingproperties and face intrinsic permeability performance, be used for respectively testing relation and the resin flows forward position relation in time that fabric thickness changes with compaction force.Because compacting process and face intrinsic permeability test process change and then cause caliper variation, compactingproperties and permeability properties that the eddy displacement sensor adopting by fabric performance test device and the present invention of designed, designed can be tested fabric efficiently, cheaply along with acting on the pressure of fabric.Designed, designed and be integrated in fiber bragg grating pressure sensor on the square step of fabric property compaction apparatus calibrate by experiment that fiber grating sensor wavelength changes and compaction force between funtcional relationship, be used to measure the true compaction force that fabric is subject to.The permeability test of fabric thickness direction is that the fabric cutting is neatly overlayed on proving installation, adopt resin center injection molded to test, on fabric thickness direction, locate across a certain distance to place mutually a pressure transducer, when resin flow during through this place pressure transducer can produce the variation of signal and obtain signal intensity relation in time by detuner, the Darcy's law of passing through calculates the penetration value on fabric thickness direction.
In the present invention, adopt negative pressure controller and the supporting signals collecting software of designed, designed to be used for accurately controlling compaction force size and the impact of compacting time on fabric compactingproperties, by designing different experiments, can realize the impact of factor on compactingproperties such as compaction force size, compacting time, fabric layers, CYCLIC LOADING and fabric types.By the fabric performance test device of designed, designed, realize the integrated testing of fabric compactingproperties and permeability properties, realize the compactingproperties continuity test under fabric dry state and hygrometric state situation, farthest identical with actual vacuum assistant resin infused process, in integrated fabric face and the test of thickness direction permeability, testing cost and efficiency are optimized.
The present invention has following technical characteristics:
1, the negative pressure controller by based on designed, designed, at internal pressure control system and supporting signals collecting software, has been realized precision control and measurement for Performance Influence Factor in the research of fabric compactingproperties;
2, adopt the fabric performance test device of designed, designed, integrated test fabric thickness and bear the sensor of pressure, has realized the simultaneity of caliper variation and compaction force relation and has tested;
3, the fabric performance test device based on the present invention's design can be used for the test of fabric side intrinsic permeability performance simultaneously for testing the eddy displacement sensor of fabric variation in thickness, has realized fabric side intrinsic permeability performance efficiently and low cost test;
4, test packaged type by change and realized easily the test of carrying out fabric permeability thickness on fabric performance test device, optimized experimental cost and efficiency.
The present invention adopts based on the homemade fiber bragg grating pressure sensor of fiber-optic grating sensor and negative pressure controller and is respectively used to the true compaction force size that is subject in the experiment of fabric compactingproperties and the technological parameter of control effect fabric compaction capacity, overcome in existing research the low and incongruent factor of true vacuum assistant resin infused condition of control accuracy, realized the sequencing control of technological parameter research.Eddy displacement sensor of the present invention both can be used for the variation in thickness of fabric in compactingproperties test, test fabric face intrinsic permeability performance that again can high efficiency, low cost, realize the integrated testing of fabric compactingproperties and permeability properties in vacuum assistant resin infused, optimized experimental cost and reliability.
Main body of the present invention be based on designed, designed integrated fabric for the eddy displacement sensor of test fabric thickness with for the fabric performance test device of the fiber bragg grating pressure sensor of the suffered true compaction force of test fabric, substantially the compacting control system forming in conjunction with vacuum pump and resin trap at the negative pressure controller of designed, designed is by program control experiment condition, reach the precision control to experimental factors, the negative pressure controller designing by employing, fiber bragg grating pressure sensor and eddy displacement sensor make fabric performance test device possess the compactingproperties of fabric and the dual-use function of permeability properties test, realize the integrated test electricity testing device to fabric key process parameter in vacuum assistant resin infused.
Brief description of the drawings
Accompanying drawing 1 is vacuum assistant resin infused fabric compactingproperties of the present invention and permeability properties integrated test electricity testing device wiring layout.
Accompanying drawing 2 is vacuum assistant resin infused fabric compactingproperties of the present invention and permeability properties integrated test electricity testing device external structure schematic diagram.
Accompanying drawing 3 is fabric control pressurer system schematic diagram of the present invention.
Accompanying drawing 4 is fabric performance testing device of the present invention and thickness measuring system side view.
Accompanying drawing 5 fabric performance testing device of the present invention front elevation.
Accompanying drawing 6 is fabric pressure testing system schematic diagram of the present invention.
Accompanying drawing 7 is experiment encapsulation schematic diagram of fabric compactingproperties of the present invention and face intrinsic permeability performance test fabric performance test device
Accompanying drawing 8 is experiment encapsulation schematic diagram of fabric thickness direction permeability properties test of the present invention.
In figure: 1. control pressurer system, 2. fabric performance testing device, 3. fabric thickness measuring system, 4. fabric pressure testing system, 5. host computer, 6. container, 7. mozzle, 8. nut, 9. sunk screw, 10.USB data connecting line, 11. vacuum pumps, 12. negative pressure controllers, 13. resin traps, 14. vacuum hoses, 15. aluminum alloy moulds, 16. surrounding grooves, 17. columns, 18. exit portals, 19. vacuum bags, 20. fabrics, 21. aluminium sheet crossbeams, 22. square steps, 23. step cutting patterns, 24. eddy displacement sensors, 25. injection ports, 26. displacement signal modulator-demodular units, 27. displacement signal amplifiers, 28., optical fiber modulation connecting line, 29. center injection mouth joints, 30. fiber-optic signal modulator-demodular units, 31. negative pressure controller gas outlets, 32. negative pressure controller air intake openings, 33. resin trap gas outlets, 34. pressure vacuum gauges, 35. resin trap air intake openings, 37. transition groove, 38. aluminium alloy sheets, 39. countersunk head screws, the special adhesive of 40. optical fiber, 41. sunk screws, 42. fiber-optic grating sensors, 43. fiber grating signal interface channels, 44. sealing adhesives, 45. resin solenoids, 46. Thin Stainless Steel cover plates, 47. flow-guiding screens, 48. diaphragm pressure sensors, 49. vacuum rapid-acting couplings, 50. pressure signal modulator-demodular units, 51. plain conductors, 52. vacuum rapid-acting coupling coupling chucks.
Embodiment
For a more detailed description to the present invention for example below in conjunction with accompanying drawing:
The present invention is that one is applied to vacuum assistant resin infused fabric compactingproperties and permeability properties integrated test electricity testing device (referring to Fig. 1 and Fig. 2), this proving installation is by control pressurer system 1, fabric performance test device 2, fabric thickness measuring system 3, fabric pressure testing system 4, the container 6 and the host computer 5 that hold infiltration liquid form, control pressurer system 1 links together by mozzle 7 and fabric performance testing device 2, fabric thickness measuring system 3 is by adopting nut 8 to be connected with fabric performance testing device 2 at aluminium sheet crossbeam 21 upper and lowers, and be connected with host computer 5 by usb data connecting line 10.Fabric pressure testing system 4 is fixed on fabric performance testing device 2 by sunk screw 39, and fabric performance testing device 2 is connected with resin container 6 by mozzle 7.Fabric pressure testing system 4 is connected with host computer by usb data connecting line 10.
Described control pressurer system 1(participates in Fig. 3) formed by vacuum pump 11, negative pressure controller 12 and resin trap 13, vacuum pump 11 is connected with the gas outlet 31 of negative pressure controller 12 by vacuum hose 14, the air intake opening 32 of negative pressure controller 12 is connected with the resin trap gas outlet 33 of resin trap 13 by vacuum hose 14, the air intake opening 35 of resin trap is connected with the exit portal 18 of fabric performance testing device 2 by mozzle 7, and the pressure vacuum gauge 34 of resin trap 13 is used for procedure for displaying force value.
Described fabric performance testing device 2(participates in Figure 4 and 5) by aluminium horizontal board mold 15, stainless steel column 17, the middle aluminium sheet crossbeam 21 with through-hole groove of aluminium alloy, center injection mouth joint 29 forms, the front elevation of aluminium horizontal board mold 15 as shown in Figure 5, be processed with surrounding groove 16 for lay fluid sealant in die face, be processed with respectively exit portal 18 and injection port 25 at length direction two ends, be processed with step cutting pattern 23 at length center position, when carrying out dry state, when hygrometric state compacting and the test of face intrinsic permeability, adopt matching size stainless steel circular slab 46 not with holes and adopt sealant sealing, while carrying out the test of thickness direction permeability properties, adopt the stainless steel circular slab 46 with holes of matching size and adopt sealant sealing.In length direction center line symmetric position, be processed with two square steps 22, on step, two ends are processed with respectively two threaded holes 36, be processed with transition groove 37 and extend to the surrounding groove 16 of die edge along two square step centerline, on aluminium horizontal board mold 15 Width center lines, process two threaded holes 17 in order to lay the middle aluminium sheet crossbeam 21 with through-hole groove of the aluminium alloy being just placed in above fabric performance testing device 2, and adopt upper lower nut 8 to be fixed on aluminium sheet crossbeam 21.
Described fabric thickness measuring system 3(is referring to accompanying drawing 1 and Fig. 4) formed by eddy displacement sensor 24, displacement signal amplifier 27 and displacement signal modulator-demodular unit 26, eddy displacement sensor 24 is connected with displacement signal amplifier 27 by the data connecting line of coupling, displacement signal amplifier adopts the data connecting line of coupling to be connected with displacement signal modulator-demodular unit 26, and displacement signal modulator-demodular unit 26 is final to be connected with host computer 5 by usb data connecting line 10.
Described fabric pressure testing system 4(is referring to accompanying drawing 6) by aluminium alloy sheet 38, sunk screw 41, the special adhesive 40 of fiber grating, fiber-optic grating sensor 42, fiber-optic signal modulator-demodular unit 30 forms, aluminium alloy sheet 38 is riveted on by sunk screw 41 in the countersunk head screw 39 on the square step 38 of aluminum alloy mould 15 of fabric Testing Platform 2, fiber-optic grating sensor 42 is by adopting the special adhesive 40 of fiber grating to be bonded in aluminium alloy sheet 38 Width centers, the back side, fiber-optic grating sensor 42 extends to surrounding groove 16 along the transition groove 37 at aluminum alloy mould 15 positive places, modulating connecting line 28 by optical fiber is connected with the fiber grating signal interface channel 43 of fiber-optic signal modulator-demodular unit 30, fiber-optic signal modulator-demodular unit 30 is connected with host computer 5 by usb data connecting line 10.
The present invention is a kind of method of testing that is applied to fiber-reinforced resin matrix compound material vacuum assistant resin infused fabric compactingproperties and permeability properties integrated testing, proving installation of the present invention respectively forms system by employing designed, designed and reasonably connection can be to compaction force size, the compacting time, CYCLIC LOADING, fabric layers and fabric types and form of presentation carry out Accurate Measurement to the impact of compactingproperties, adopt experimental provision of the present invention to comprise under dry state and two kinds of experiment situations of hygrometric state and the test of face intrinsic permeability performance according to the compactingproperties that is close to identical experiment packaged type and carries out fabric, while test due to fabric thickness direction permeability properties, infiltrate the flow direction of liquid not identical with the flow direction of face intrinsic permeability and hygrometric state compaction capacity, when adopt another experimental technique in the time fabric thickness direction being carried out to permeability test, below being divided into two groups is introduced the test experiments step that adopts proving installation of the present invention to carry out fabric compactingproperties and permeability properties:
5.1 fabric compaction capacities and face intrinsic permeability method of testing
The first step: sample is chosen
Fabric 20 is cut between the resin injection mouth 25 of the positive top of aluminum alloy mould 15 and exit portal 18 to the distance big or small size that matches, then carry out lay according to the default laying direction of experiment purpose and laying number of plies n, the cutting of noting fabric is neat, can not there is burrs on edges or size out of true, while stacking fabric, should neatly stack.
Described sample, for not resiniferous fabric, can comprise plain cloth, twills, satin fabric, one-way fabric etc.
Described ply sequence can design according to the needs of composite element design, can be unidirectional laying, orthogonal laying, quasi-isotropic laying etc.
Described laying number of plies n only need be according to the Location of requirement of experiment test.
Second step: compactingproperties and face intrinsic permeability performance test pre-preparation
Before formally testing, first control pressurer system 1, thickness measuring system 3, pressure testing system 4 are coupled together according to the wiring layout of accompanying drawing 1 with host computer.The connected mode of each building block of each system is as introduced above as described in each components of system as directed.Specifically: vacuum pump 11 is connected with the gas outlet 31 of negative pressure controller 12 by vacuum hose 14, the air intake opening 32 of negative pressure controller 12 is connected with the resin trap gas outlet 33 of resin trap 13 by vacuum hose 14, the air intake opening 35 of resin trap is connected with the exit portal 18 of fabric performance testing device 2 by mozzle 7, and the pressure vacuum gauge 34 of resin trap 13 is used for procedure for displaying force value.Aluminum alloy mould 15 fronts are processed with surrounding groove 16 for lay fluid sealant, be processed with respectively exit portal 18 and injection port 25 at length direction two ends, be processed with step cutting pattern 23 at length center position, on step cutting pattern, cover and adopt sealant sealing with matching size stainless steel circular slab 46 not with holes, in length direction center line symmetric position, be processed with two square steps 22, on step, two ends are processed with respectively two threaded holes 36, to adopt sunk screw 41 to be fixed on square step 22 by connecting the countersunk head screw 39 of square step 22 with the aluminium alloy sheet 38 that the glutinous agent 40 of optical fiber special glue is stained with fiber-optic grating sensor 42, the transition groove 37 that fiber-optic grating sensor 42 is gone out along aluminum alloy mould 15 surface working the surrounding groove 16 that extends to die edge, on aluminium horizontal board mold 15 Width center lines, process two threaded holes 17 in order to lay the middle aluminium sheet crossbeam 21 with through-hole groove of the aluminium alloy being just placed in above fabric performance testing device 2, and adopt upper lower nut 8 to be fixed on aluminium sheet crossbeam 21.Eddy displacement sensor 24 is connected with displacement signal amplifier 27 by the data connecting line of coupling, displacement signal amplifier adopts the data connecting line of coupling to be connected with displacement signal modulator-demodular unit 26, and displacement signal modulator-demodular unit 26 is final to be connected with host computer 5 by usb data connecting line 10.Aluminium alloy sheet 38 is riveted on by sunk screw 41 in the countersunk head screw 39 on the square step 38 of aluminum alloy mould 15 of fabric Testing Platform 2, fiber-optic grating sensor 42 is by adopting the special adhesive 40 of fiber grating to be bonded in aluminium alloy sheet 38 Width centers, the back side, fiber-optic grating sensor 42 extends to surrounding groove 16 along the transition groove 37 at aluminum alloy mould 15 positive places, modulating connecting line 28 by optical fiber is connected with the fiber grating signal interface channel 43 of fiber-optic signal modulator-demodular unit 30, fiber-optic signal modulator-demodular unit 30 is connected with host computer 5 by usb data connecting line 10, connect and set relevant parameter frequency acquisition and data storage directory according to experiment demand afterwards.
The 3rd step: the lay of fabric and encapsulation
After second step completes, the fabric 20 that cutting is completed stacks neat between the injection port 25 and exit portal 18 of aluminum alloy mould 15 (referring to accompanying drawing 7) according to experiment demand, the fluid sealant 44 of placing resin solenoids 45 that equate with fabric width in injection port 25 and exit portal 18 positions respectively and adopt fluid sealant and be laid in surrounding groove 16 places links into an integrated entity, and be connected with mozzle 7, mozzle 7 is connected with the container 6 that holds infiltration liquid, in the time carrying out dry state compacting, resin injection mouth 26 is sealed, prevent gas leakage.In the time carrying out the hygrometric state compacting of fabric and the test of face intrinsic permeability, resin injection mouth 26 is inserted into infiltration liquid internal.The resin solenoid 45 of one end leads to outside the fluid sealant 44 at surrounding groove 16 places in addition, adopts mozzle 7 to be connected with the air intake opening 35 of resin trap 13.After waiting to lay, cutting place is the vacuum bag film 19 of size suitably, adopt sealing on the surrounding fluid sealant 44 of fluid sealant 44 on aluminum alloy mould 15 is positive, pleating wrinkle is smooth to ensure the vacuum bag 19 at the fabric place place between injection port 25 and exit portal 18 in position, pastes the electric conductivity of a row aluminium-foil paper with increase vacuum bag 19 just below at the corresponding eddy displacement sensor 24 in vacuum bag surface.The solid 17 of aluminum alloy mould 15 both sides is for having the aluminium sheet crossbeam 21 of groove in the middle of placing, and adopt nut 8 to be fixed, use the mode of coupling nut 25 to be installed with at aluminium sheet crossbeam 21 for the eddy displacement sensor 24 of fabric thickness measure by upper and lower.Eddy displacement sensor 24 is connected with displacement signal modulator-demodular unit 26 by displacement signal amplifier 27, and joins by usb data connecting line and host computer 5.
After to be packaged completing, in corresponding control program, set the required experiment parameter of experiment, after zero clearing, can carry out the experiment of dry state compactingproperties.Before experiment starts, adopt two eddy displacement sensors first to test out the original depth of wish experiment fabric preform, experimental technique content is being declared patent as another.Experimentation gathers the variation in thickness of fabric and the compaction force data that are subject to simultaneously, the variation of the thickness that eddy current position transducer can be monitored fabric under different acting forces, fiber bragg grating pressure sensor acts on the compaction force size on fabric for monitoring experiment process.Can obtain the thickness of fabric under this compaction force according to original depth and variation in thickness, thereby can obtain the variation relation of fabric thickness with compaction force, then according to the relational expression of fabric thickness and fiber volume fraction and then can obtain the funtcional relationship between fabric fiber volume fraction and compaction force.
When the test of the hygrometric state compaction capacity of fabric, only need be placed near the mozzle 7 at injection port 25 places holding the container 6 that infiltrates resin, when test, directly mozzle 7 is inserted in the infiltration liquid of container 6 inside, other steps are identical with dry state compactingproperties experimentation, that is: after to be packaged completing, design required experiment parameter, complete the balance zero clearing step of testing software, can test.In resin impregnation process, keep the collection of all experimental datas simultaneously.The experimental result preparation method of fabric hygrometric state compactingproperties is as dry state compact test step.
Based on fabric compactingproperties and the testing integrated gasifying device of permeability properties of the present invention's design, the fabric face intrinsic permeability performance hardly experimental technique of the test of the employing fabric hygrometric state compactingproperties through changing obtains.The device of the present invention's design is to adopt line injection system to carry out fabric hygrometric state compactingproperties experiment test, known according to Darcy's law, under the situation of online injection, the face intrinsic permeability of fabric can infiltrate the flow fronts position of liquid in fabric funtcional relationship in time by detection and obtain, adopt the eddy displacement sensor 24 in fabric thickness measuring system 3 of the present invention to test accurately in the flow fronts of fabric inside infiltrating resin, not only unsaturation permeability is tested, can there is to the test of saturated permeability the advantage of high efficiency, low cost simultaneously.Experimental technique is that eddy displacement sensor is distributed on aluminium sheet crossbeam 21 horizontal directly over aluminum alloy mould 15, in the time that resin flows forward tests at six identical eddy displacement sensors 24 of placement of aluminium sheet crossbeam 21 equal intervals, they can be used for obtaining five resin flows forwards experimental data in time, according to the relative theory of Darcy's law, can obtain easily the experimental data of fabric face intrinsic permeability performance.Adopt eddy displacement sensor monitoring infiltration resin in the principle of the resin flows process of fabric to be: in the manufacturing process of the vacuum assistant resin infused of compound substance, no matter be test unsaturation permeability or saturated permeability performance, the injection molding that infiltrates liquid flows and can cause the pressure acting on fabric to reduce, and then generation fabric thickness changes, the eddy displacement sensor 24 that is arranged in fabric top aluminium sheet crossbeam 21 through-hole grooves can facilitate the variation in thickness of monitoring accurately fabric, and change relation in time by displacement signal modulator-demodular unit picked up signal, thereby low cost, high efficiency monitoring resin flows forward's position, infiltration liquid in the present invention can be soybean oil, corn steep liquor, unsaturated polyester (UP) or other can be used for the resin of vacuum assistant resin infused.
5.2 fabric thickness direction permeability method of testing steps
The present invention is that one is applied to fabric compactingproperties and the integrated proving installation of permeability properties in fiber-reinforced resin matrix compound material vacuum assistant resin infused, be different at face intrinsic permeability, hygrometric state compactingproperties test experiments from the flow direction of thickness direction permeability properties owing to infiltrating liquid, in the time of the test of being correlated with, adopt different experiment packaged types.When in the time fabric laying thickness direction being carried out to permeability test, its thickness direction permeability method of testing has the following steps:
Carrying out before thickness direction permeability test experiments, first the stainless steel circular sheet 46 not with holes being placed on aluminum alloy mould 15 front step cutting patterns 23 for fabric dry state, the test of hygrometric state compactingproperties and face intrinsic permeability performance test process is replaced to stainless sheet steel with holes 46, and adopt sealant sealing can test after completion of cure.What in the time carrying out the experiment of fabric thickness direction permeability, adopt is that the mode of center injection is carried out, by adopt experimental provision of the present invention and for fabric permeability thickness performance test specifically test packaged type and can facilitate and test accurately required thickness direction Permeability Parameters.
The first step: sample is chosen
Fabric 20 is cut into and the square sample that is of a size of 50*50mm, then carries out laying according to ply sequence and laying number of plies n and form fabric preform;
Described sample, for not resiniferous fabric, can comprise plain cloth, twills, satin fabric, one-way fabric etc.
Described ply sequence can design according to the needs of composite element design, can be unidirectional laying, orthogonal laying, quasi-isotropic laying etc.
Described laying number of plies n only need be according to the Location of requirement of experiment test.
Second step: experiment encapsulation
On the Thin Stainless Steel cover plate 46 with holes of the front step cutting pattern 23 of the aluminum alloy mould 15 that cleaning is completed, covering three layers of flow-guiding screen 47(referring to accompanying drawing 8) first injection port resin out in Yi Jiangcong center flow on aluminum alloy mould 15 surface, the permeability of flow-guiding screen 47 is than high two orders of magnitude of fabric, and three layers of flow-guiding screen of covering can ensure that resin is first at the Uniform Flow that forms die surface; Then the fabric 20 neatly cutting being completed above flow-guiding screen 47, placing a diaphragm pressure sensor 48 along equidistant from distance place on fabric 20 thickness directions for can produce signal intensity in the time infiltrating liquid flow fronts through out-of-date record, because the riding position of diaphragm pressure sensor 48 is controlled voluntarily by experiment operator, can conveniently read out by pressure signal modulator-demodular unit 50 the liquid flow fronts relation in time that infiltrates, the thickness of fabric answers 10mm above to ensure the accuracy of thickness direction resin flows forward position measurement.The infiltration liquid that three layers of flow-guiding screen 47 of lay inject from fabric 20 bottom surfaces for current-sharing above fabric, above flow-guiding screen 47, place one with the measure-alike vacuum rapid-acting coupling 49 of fabric, adopt vacuum bag 19 to cover in whole device, and utilize sealing adhesive 44 to seal, the profile that will ensure vacuum bag 19 in encapsulation process is consistent with fabric 20 shapes under Vacuum Pressure strength, vacuum rapid-acting coupling 49 is directly connected with vacuum rapid-acting coupling matched junction 52, vacuum rapid-acting coupling matched junction 52 is connected with the air intake 35 of resin trap 13 by mozzle 7.Pressure signal modulator-demodular unit 50 is connected with host computer 5 by usb data connecting line.The center injection mouth joint 29 of aluminum alloy mould 15 belows is connected with the container 6 that holds infiltration liquid by mozzle 7.
After to be packaged completing, in corresponding control program, set the required experiment parameter of experiment, after zero clearing, can carry out the experiment of dry state compactingproperties.The data acquisition of the permeability properties of fabric thickness direction adopts the identical mode processing of fabric face intrinsic permeability performance test.Infiltration liquid in the present invention can be the resin that soybean oil, corn steep liquor, unsaturated polyester (UP) or other can be used for vacuum assistant resin infused.
Claims (10)
1. be applied to fiber-reinforced resin matrix compound material vacuum assistant resin infused fabric compactingproperties and a permeability properties integrated test electricity testing device, it is characterized in that:
Comprise control pressurer system (1), fabric performance test device (2), fabric thickness measuring system (3), fabric pressure testing system (4), container (6) and host computer (5),
Described control pressurer system (1) links together by mozzle (7) and fabric performance testing device (2), fabric thickness measuring system (3) is connected with fabric performance testing device (2) by the nut (8) of aluminium sheet crossbeam (21) above and below, and be connected with host computer (5) by usb data connecting line (10), fabric pressure testing system (4) is fixed on fabric performance testing device (2) by sunk screw (41), fabric performance testing device (2) is connected with container (6) by mozzle (7), fabric pressure testing system (4) is connected with host computer by usb data connecting line (10),
Described control pressurer system (1) is by vacuum pump (11), negative pressure controller (12) and resin trap (13) composition, vacuum pump (11) is connected with the gas outlet (31) of negative pressure controller (12) by vacuum hose (14), the air intake opening (32) of negative pressure controller (12) is connected with the resin trap gas outlet (33) of resin trap (13) by vacuum hose (14), the air intake opening (35) of resin trap is connected with the exit portal (18) of fabric performance testing device (2) by mozzle (7), the pressure vacuum gauge (34) of resin trap (13) is used for procedure for displaying force value,
Described fabric performance testing device (2) is made up of aluminium horizontal board mold (15), stainless steel column (17), aluminium sheet crossbeam (21), center injection mouth joint (29), aluminium horizontal board mold (15) front is processed with surrounding groove (16), be processed with respectively exit portal (18) and injection port (25) at length direction two ends, be processed with step cutting pattern (23) at length center position, on step cutting pattern (23), be furnished with the stainless steel circular slab with holes or not with holes (46) of size coupling, and with sealant sealing; In length direction center line symmetric position, be processed with two square steps (22); on step, two ends are processed with respectively two threaded holes (39); be processed with transition groove (37) and extend to the surrounding groove (16) of die edge along two square step centerline; on aluminium horizontal board mold (15) Width center line, process two threaded holes; described threaded hole and stainless steel column (17) are used in conjunction with, and aluminium sheet crossbeam (21) is fixed on stainless steel column (17) by upper lower nut (8);
Described fabric thickness measuring system (3) is made up of eddy displacement sensor (24), displacement signal amplifier (27) and displacement signal modulator-demodular unit (26), described eddy displacement sensor (24) is arranged in the through-hole groove of aluminium sheet crossbeam (21), and fixing with nut (8); Eddy displacement sensor (24) is connected with displacement signal amplifier (27) by the data connecting line of coupling; displacement signal amplifier adopts the data connecting line of coupling to be connected with displacement signal modulator-demodular unit (26), and displacement signal modulator-demodular unit (26) is connected with host computer (5) by usb data connecting line (10);
Described fabric pressure testing system (4) is by aluminium alloy sheet (38), sunk screw (41), the special adhesive of fiber grating (40), fiber-optic grating sensor (42), fiber-optic signal modulator-demodular unit (30) composition, aluminium alloy sheet (38) is riveted on by sunk screw (41) on the square step (22) of aluminum alloy mould (15) of fabric performance testing device (2), fiber-optic grating sensor (42) is by adopting the special adhesive of fiber grating (40) to be bonded in Width center, aluminium alloy sheet (38) back side, fiber-optic grating sensor (42) extends to surrounding groove (16) along the transition groove (37) at the positive place of aluminum alloy mould (15), modulating connecting line (28) by optical fiber is connected with the fiber grating signal interface channel (43) of fiber-optic signal modulator-demodular unit (30), fiber-optic signal modulator-demodular unit (30) is connected with host computer (5) by usb data connecting line (10).
2. integrated test electricity testing device according to claim 1, is characterized in that: described container is beaker, is contained with infiltration liquid in beaker.
3. integrated test electricity testing device according to claim 1, is characterized in that: described mozzle is resin mozzle.
4. integrated test electricity testing device according to claim 1, is characterized in that: described aluminium sheet crossbeam is aluminum alloy material, and it is middle with through-hole groove.
5. integrated test electricity testing device according to claim 1, is characterized in that: the quantity of described eddy displacement sensor is 4-10, equidistantly places.
6. according to the application of the integrated test electricity testing device of claim 1-4 any one, be applied to the fabric of vacuum assistant resin infused.
7. according to the fabric compaction capacity of the integrated test electricity testing device of claim 1-5 any one and face intrinsic permeability method of testing, it is characterized in that comprising the steps:
The first step: sample is chosen
Fabric (20) is cut between the resin injection mouth (25) of the positive top of aluminum alloy mould (15) and exit portal (18) to the distance big or small size that matches, then carry out lay according to the default laying direction of experiment purpose and laying number of plies n, the cutting of noting fabric is neat, can not there is burrs on edges or size out of true, while stacking fabric, should neatly stack;
Second step: compactingproperties and face intrinsic permeability performance test pre-preparation
Before formally testing, first control pressurer system (1), fabric thickness measuring system (3), fabric pressure testing system (4) are coupled together with host computer (5), vacuum pump (11) is connected with the gas outlet (31) of negative pressure controller (12) by vacuum hose (14), the air intake opening (32) of negative pressure controller (12) is connected with the resin trap gas outlet (33) of resin trap (13) by vacuum hose (14), the air intake opening (35) of resin trap is connected with the exit portal (18) of fabric performance testing device (2) by mozzle (7), and the pressure vacuum gauge (34) of resin trap (13) is used for procedure for displaying force value, aluminum alloy mould (15) front is processed with surrounding groove (16) for lay fluid sealant, be processed with respectively exit portal (18) and injection port (25) at length direction two ends, process step cutting pattern (23) at length center position, on step cutting pattern, cover and adopt sealant sealing with matching size stainless steel circular slab not with holes (46), in length direction center line symmetric position, be processed with two square steps (22), on step, two ends are processed with respectively two threaded holes, adopt sunk screw (41) to be fixed on square step (22) by the countersunk head screw (39) that connects square step (22) aluminium alloy sheet (38) that is stained with fiber-optic grating sensor (42) with the glutinous agent (40) of optical fiber special glue, the transition groove (37) that fiber-optic grating sensor (42) is gone out along aluminum alloy mould (15) surface working the surrounding groove (16) that extends to die edge, on aluminium horizontal board mold (15) Width center line, process two threaded holes in order to lay the middle aluminium sheet crossbeam (21) with through-hole groove of aluminium alloy that is just placed in fabric performance testing device (2) top, and adopt upper lower nut (8) to be fixed on aluminium sheet crossbeam (21), eddy displacement sensor (24) is connected with displacement signal amplifier (27) by the data connecting line of coupling, displacement signal amplifier adopts the data connecting line of coupling to be connected with displacement signal modulator-demodular unit (26), and displacement signal modulator-demodular unit (26) is finally connected with host computer (5) by usb data connecting line (10), aluminium alloy sheet (38) is riveted on by sunk screw (41) in the countersunk head screw (39) on the square step (38) of aluminum alloy mould (15) of fabric Testing Platform (2), fiber-optic grating sensor (42) is by adopting the special adhesive of fiber grating (40) to be bonded in Width center, aluminium alloy sheet (38) back side, fiber-optic grating sensor (42) extends to surrounding groove (16) along the transition groove (37) at the positive place of aluminum alloy mould (15), modulating connecting line (28) by optical fiber is connected with the fiber grating signal interface channel (43) of fiber-optic signal modulator-demodular unit (30), fiber-optic signal modulator-demodular unit (30) is connected with host computer (5) by usb data connecting line (10), connect and set relevant parameter frequency acquisition and data storage directory according to experiment demand afterwards,
The 3rd step: the lay of fabric and encapsulation
After second step completes, the fabric (20) that cutting is completed stacks neatly between the injection port (25) and exit portal (18) of aluminum alloy mould (15) according to experiment demand, place respectively a resin solenoid (45) equating with fabric width in injection port (25) and exit portal (18) position and adopt fluid sealant and be laid in the fluid sealant (44) that surrounding groove (16) locates and link into an integrated entity, and be connected with mozzle (7), mozzle (7) is connected with the container (6) that holds infiltration liquid, in the time carrying out dry state compacting, resin injection mouth (26) is sealed, prevent gas leakage, in the time carrying out the hygrometric state compacting of fabric and the test of face intrinsic permeability, resin injection mouth (26) is inserted into infiltration liquid internal, the resin solenoid (45) of one end leads to outside the fluid sealant (44) that surrounding groove (16) locates in addition, adopts mozzle (7) to be connected with the air intake opening (35) of resin trap (13), after waiting to lay, cutting place is the vacuum bag film (19) of size suitably, adopt the upper sealing of the surrounding fluid sealant (44) of fluid sealant (44) on aluminum alloy mould (15) is positive, pleating wrinkle is smooth to ensure the vacuum bag (19) at fabric place place between injection port (25) and exit portal (18) in position, the vacuum bag corresponding eddy displacement sensor in surface (24) just below paste the electric conductivity of a row aluminium-foil paper with increase vacuum bag (19), the column (17) of aluminum alloy mould (15) both sides is for having the aluminium sheet crossbeam (21) of groove in the middle of placing, and adopt nut (8) to be fixed, use the mode of coupling nut (25) to be installed with in aluminium sheet crossbeam (21) for the eddy displacement sensor (24) of fabric thickness measure by upper and lower, eddy displacement sensor (24) is connected with displacement signal modulator-demodular unit (26) by displacement signal amplifier (27), and joins by usb data connecting line and host computer (5),
After to be packaged completing, in corresponding control program, set the required experiment parameter of experiment, after zero clearing, can carry out the experiment of dry state compactingproperties; Before experiment starts, adopt two eddy displacement sensors first to test out the original depth of wish experiment fabric preform; Experimentation gathers the variation in thickness of fabric and the compaction force data that are subject to simultaneously, the variation of the thickness that eddy current position transducer can be monitored fabric under different acting forces, fiber bragg grating pressure sensor acts on the compaction force size on fabric for monitoring experiment process; Can obtain the thickness of fabric under this compaction force according to original depth and variation in thickness, thereby can obtain the variation relation of fabric thickness with compaction force, then according to the relational expression of fabric thickness and fiber volume fraction and then can obtain the funtcional relationship between fabric fiber volume fraction and compaction force;
When the test of the hygrometric state compaction capacity of fabric, only need be placed near the mozzle (7) that injection port (25) locates holding the container (6) that infiltrates resin, when test, directly mozzle (7) is inserted in the inner infiltration liquid of container (6), other steps are identical with dry state compactingproperties experimentation, that is: after to be packaged completing, design required experiment parameter, complete the balance zero clearing step of testing software, can test; In resin impregnation process, keep the collection of all experimental datas simultaneously; The experimental result preparation method of fabric hygrometric state compactingproperties is as dry state compact test step.
8. according to the fabric thickness direction permeability method of testing of the integrated test electricity testing device of claim 1-5 any one, it is characterized in that comprising the steps:
The first step: sample is chosen
Fabric (20) is cut into and the square sample that is of a size of 50*50mm, then carries out laying according to ply sequence with laying number of plies n and become fabric preform;
Second step: experiment encapsulation
Three layers of flow-guiding screen 47 of the upper covering of Thin Stainless Steel cover plate with holes (46) of the front step cutting pattern (23) of the aluminum alloy mould (15) that cleaning is completed, make first to flow on aluminum alloy mould (15) surface from center injection port resin out, the permeability of flow-guiding screen (47) is than high two orders of magnitude of fabric, and three layers of flow-guiding screen of covering can ensure that resin is first at the Uniform Flow that forms die surface, then the fabric (20) neatly cutting being completed in resin flow-guiding screen (47) top, placing a diaphragm pressure sensor (48) along equidistant from distance place on fabric (20) thickness direction for can produce signal intensity in the time infiltrating liquid flow fronts through out-of-date record, because the riding position of diaphragm pressure sensor (48) is controlled voluntarily by experiment operator, can conveniently read out by pressure signal modulator-demodular unit (50) the liquid flow fronts relation in time that infiltrates, the thickness of fabric answers 10mm above to ensure the accuracy of thickness direction resin flows forward position measurement, above fabric, three layers of flow-guiding screen of lay (47) carry out the infiltration liquid that current-sharing is injected from fabric (20) bottom surface, place in flow-guiding screen (47) top one with the measure-alike vacuum rapid-acting coupling (49) of fabric, adopt vacuum bag (19) to cover in whole device, and utilize sealing adhesive (44) to seal, the profile that will ensure vacuum bag (19) in encapsulation process is consistent with fabric (20) shape under Vacuum Pressure strength, vacuum rapid-acting coupling (49) is directly connected with vacuum rapid-acting coupling matched junction (52), vacuum rapid-acting coupling matched junction (52) is connected with the air intake (35) of resin trap (13) by mozzle (7), pressure signal modulator-demodular unit (50) is connected with host computer (5) by usb data connecting line, and the center injection mouth joint (29) of aluminum alloy mould (15) below is connected with the container (6) that holds infiltration liquid by mozzle (7),
After to be packaged completing, in corresponding control program, set the required experiment parameter of experiment, after zero clearing, can carry out the experiment of dry state compactingproperties; The data acquisition of the permeability properties of fabric thickness direction adopts the identical mode processing of fabric face intrinsic permeability performance test.
9. according to the method for testing described in claim 7 or 8, it is characterized in that: described sample, for not resiniferous fabric, can comprise plain cloth, twills, satin fabric, one-way fabric etc.;
Described ply sequence can design according to the needs of composite element design, can be unidirectional laying, orthogonal laying, quasi-isotropic laying etc.;
Described laying number of plies n only need be according to the Location of requirement of experiment test.
10. according to the method for testing described in claim 7 or 8, it is characterized in that: described infiltration liquid can be the resin that soybean oil, corn steep liquor, unsaturated polyester (UP) or other can be used for vacuum assistant resin infused.
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