CN108254251B - Atmosphere-controllable carbon fiber symmetric bending high-cycle fatigue test device - Google Patents
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- CN108254251B CN108254251B CN201810022347.4A CN201810022347A CN108254251B CN 108254251 B CN108254251 B CN 108254251B CN 201810022347 A CN201810022347 A CN 201810022347A CN 108254251 B CN108254251 B CN 108254251B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
Abstract
The invention discloses an atmosphere-controllable carbon fiber symmetric bending high-cycle fatigue test device, and belongs to the field of fatigue behavior research of micron-sized wires. The testing device takes a direct-current power supply as a driving force to enable the carbon fiber to generate symmetrical bending high-cycle fatigue behavior between two electrodes, and a counter is used for observing the progress of the fatigue process; inert gas is used as an atmosphere source, the organic glass box is used as a place for controlling atmosphere, and the air tightness and the atmosphere stability of the box body are monitored by a humidifier, a hygrothermograph and a pressure gauge. And recording the service life and the vibration process of the carbon fiber by using a high-speed camera, and performing mechanical simulation according to the deformation track of the carbon fiber to obtain the stress condition of the carbon fiber. The invention provides a clean atmosphere environment for an electric-drive vibration fiber fatigue behavior research test, ensures the smooth operation of the test, obtains the fatigue life and the stress of the fiber, and inspects the influence of atmosphere type and humidity on the fatigue behavior of the carbon fiber.
Description
Technical Field
The invention belongs to the field of fatigue behavior research of micron-sized wires, and particularly relates to an atmosphere-controllable carbon fiber symmetric bending high-cycle fatigue test device.
Background
Various tests in the prior art prove that the fatigue life of the silicon crystal made of the micron-sized brittle material in the fourth main group is sensitive to the environment, the surface of the silicon crystal is oxidized in a corrosion environment, a crack is generated and expands towards the inside of a matrix under the double actions of stress and the environment, and when the crack reaches a critical dimension, the silicon crystal fails in fatigue. However, it is a little to study whether the fatigue failure of the carbon fiber monofilament is sensitive to the environment. The carbon fiber monofilament is used as a reinforcement of the carbon fiber composite material and is a key component for determining the mechanical property and the physical property of the carbon fiber composite material, the tissue structure of the carbon fiber can be damaged due to excessive humidity or improper gas atmosphere, the performance of the carbon fiber can be further damaged, the fatigue life of the carbon fiber can be shortened, the function and the service life of the carbon fiber composite material can be further influenced, the fatigue life of the carbon fiber can be prolonged under a proper service environment, and the reliability of the carbon fiber composite material can be improved. In the prior art in China, reliability and environment tests are generally carried out on carbon fiber composite materials, and no environment test aiming at the fatigue behavior of carbon fiber monofilaments is carried out, so that a set of atmosphere controllable device needs to be designed according to the fatigue test of the carbon fiber monofilaments to research the influence of the environment on the symmetric bending high-cycle fatigue behavior of the carbon fibers, and the service life of the carbon fiber composite materials is prolonged.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an atmosphere-controllable carbon fiber symmetric bending high-cycle fatigue test device, which aims to research the influence of atmosphere types and humidity on the fatigue life and the tissue structure of carbon fiber monofilaments by controlling the atmosphere types (including inert gases such as nitrogen and argon) and the humidity in the carbon fiber fatigue test process.
The atmosphere-controllable carbon fiber symmetric bending high-cycle fatigue test device provided by the invention comprises a direct-current power supply, an amplifying circuit, a counter, a test bed, a box body, an inert gas tank, a pressure gauge A, a pressure gauge B, a humidifier, a hygrothermograph, a high-speed camera, a light source and parchment paper.
The amplifying circuit is connected with the counter in parallel and then connected between the positive electrode and the negative electrode of the direct current power supply, and the negative electrode of the direct current power supply is directly connected with the negative electrode.
The method comprises the following steps of selecting a vertically placed organic glass plate as a test bed, bonding the organic glass plate in a small cuboid shape on the test bed as an object stage of carbon fibers, and enabling the size of the small cuboid to be 3cm multiplied by 2cm in length multiplied by width. The test bed on still bond and have two cylinder electrodes, the cylinder electrode is located the both sides of objective table, the symmetry sets up, the side of cylinder electrode bonds on the test bed, two bottom surfaces perpendicular to test bed. One end of the carbon fiber is bonded on the objective table, the height of a bonding point is higher than that of the upper bottom surface of the cylindrical electrode, and the height difference is controlled within 0.5 mm; the other end of the carbon fiber is suspended, the carbon fiber is vertically downward parallel to the organic glass plate, self gravity interference is avoided, the symmetrical bending fatigue vibration process is guaranteed to be always on the same plane, the carbon fiber is located in the middle of the two cylindrical electrodes and is parallel to the axis of the left electrode and the axis of the right electrode, and therefore the symmetry of the stress process near the left electrode and the right electrode is guaranteed. When the diameter range of the fiber is 5um-100um, the length is more than or equal to 4mm, and the length of the fiber is more than or equal to half of the electrode spacing (2-4mm), the stable vibration of the fiber in the electric field can be realized by adjusting the proper atmosphere condition.
When the circuit is connected, the carbon fiber is in a uniform electrostatic field between the two electrodes, the carbon fiber is cyclically and alternately subjected to attractive force and repulsive force between the positive electrode and the negative electrode, and symmetric bending high-cycle fatigue behavior occurs between the two electrodes.
The stable vibration condition of the carbon fiber can be achieved by adjusting the length L of the carbon fiber, the distance 2d between the electrodes and the voltage V of the direct-current power supply, and the vibration amplitude of the carbon fiber can be changed by changing the test parameters.
The amplifying circuit is connected with the counter in parallel, can amplify electric signals generated in the bidirectional bending vibration process of the carbon fibers, is represented in a digital form, and can monitor the progress of the vibration of the carbon fibers.
In order to control the atmosphere condition in the fatigue process, an external inert gas tank (inert gas is nitrogen, argon and the like) is used as an atmosphere source, and a pressure gauge A regulates and controls the air inlet pressure. And processing an organic glass box body with proper thickness as a test site.
The box uses the blind flange to push up so that dismantle, box thickness is 1 centimetre in order to bear two atmospheric pressure, and two high breather valves of box side-mounting one hangs down, is intake valve and air outlet valve respectively, bores two apertures and is convenient for two cylinder electrodes and box outer DC power supply intercommunication on the box internal test bench, bores a macropore and is used for the outer manometer B of installation box, and the junction uses sealed glue etc. to guarantee that its leakproofness is good, places humiture in the hygrothermograph monitoring box of suitable size in the box.
Through controlling the atmosphere concentration in the air intake speed and the air intake time adjusting box body, manometer B is used for monitoring the atmospheric pressure in the box body, guarantees the purity of atmosphere in the box body, uses the humidity in the humidifier adjusting box body, uses temperature and humidity change in the industrial-grade hygrothermograph dynamic monitoring box body, guarantees that the atmosphere environment is stable.
And selecting a high-speed camera to observe the vibration condition of the carbon fiber under the specific atmosphere condition. The high-speed camera is independent of the carbon fiber symmetrical bending high-cycle fatigue device and the atmosphere adjusting device and is independently placed. When the high-speed camera is used, the high-speed camera is positioned right in front of the box body, the light source is arranged right behind the box body, and the height of the high-speed camera is adjusted to enable the high-speed camera, the objective table and the light source to be coaxial.
And adjusting the brightness of the light source, the exposure time of the high-speed camera and the shooting speed to record the vibration process of the carbon fibers, and obtaining the vibration frequency of the carbon fibers and the deformation image of the whole or part of the carbon fibers.
And obtaining a carbon fiber deformation curve according to the shot carbon fiber deformation image, and performing mechanical simulation by using a finite element numerical simulation technology Abaqus as a boundary condition to obtain the maximum stress of the root of the carbon fiber at the maximum deformation position.
And obtaining the fatigue vibration frequency of the carbon fiber according to the shot deformation process of the carbon fiber, recording the fatigue vibration time, and calculating the fatigue life of the carbon fiber. After the carbon fiber is fractured through high-cycle symmetrical bending fatigue, the power supply is turned off, the carbon fiber is slowly and transversely pulled away from the flange cover, the fractured fiber is prevented from being impacted by airflow, the fractured fiber end is taken out by using an adhesive tape, a sample is prepared, the carbon fiber fatigue fracture is observed by using an SEM (scanning electron microscope), and the influence of the atmosphere environment on the carbon fiber fatigue fracture mechanism is researched.
Compared with the prior art, the test device for controlling the environment atmosphere in the carbon fiber symmetric bending high-cycle fatigue test process is creatively built, and the possibility of researching the influence of atmosphere type and humidity on the fatigue performance and the tissue structure of the carbon fiber is realized.
Drawings
FIG. 1 is a schematic view of a carbon fiber symmetric bending high cycle fatigue test device under a nitrogen atmosphere provided by the invention.
Fig. 2 is a schematic diagram of a fatigue motion track of carbon fiber shot by a high-speed camera.
FIG. 3 is a graph showing the influence of the atmosphere type on the symmetric bending high cycle fatigue life of carbon fibers, in which the abscissa represents the test number and the ordinate represents the logarithm of the fatigue life.
FIG. 4 shows the structural change of the carbon fiber fatigue fracture tissue under the combined action of the atmosphere species and the humidity.
Fig. 5A and 5B are the mechanical simulation result of the bending deformation of the MPP-based carbon fiber monofilament at a voltage of 3.5kV and the maximum stress applied to the carbon fiber at different voltages.
In the figure:
1. a nitrogen tank; 2. a pressure gauge A; 3. a box body; 4. a test bed; 5. a humidifier; 6. a hygrothermograph; 7. a pressure gauge B; 8. a direct current power supply; 9. an amplifying circuit; 10. a counter; 11. a high-speed camera; 12. a light source; 13. and (4) parchment paper.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The invention provides an atmosphere-controllable carbon fiber symmetrical bending high-cycle fatigue test device, which comprises a nitrogen tank 1, a pressure gauge A2, a box body 3, a test bed 4, a humidifier 5, a hygrothermograph 6, a pressure gauge B7, a direct-current power supply 8, an amplifying circuit 9, a counter 10, a high-speed camera 11, a light source 12 and parchment paper 13, as shown in figures 1 and 2.
The nitrogen tank 1 can also be an argon tank for providing stable inert gases such as nitrogen or argon for the test bed 4 in the box body 3. A pressure gauge A2 is arranged at the outlet of the nitrogen tank 1 to control the outlet pressure of the nitrogen.
The box body 3 is an organic glass box structure and is convenient to disassemble by taking a flange cover as a top. The thickness of the box body 3 is 1 cm so as to bear two atmospheric pressures, two lower and higher vent valves are arranged on the side surface of the box body 3 and respectively comprise an air inlet valve and an air outlet valve hole, the air inlet valve is connected with the nitrogen tank 1 through a pipeline, and the air outlet valve is communicated with the atmospheric environment. Two small holes are drilled in the box body 3, so that the two electrodes on the test bed 4 in the box body 3 are communicated with a circuit between the direct current power supply outside the box body 3, and the height of the air inlet valve is lower than that of the air outlet valve. A large hole is drilled in the box body 3, a pressure gauge B7 is installed outside the box body 3, the joint of the pressure gauge B7 and the box body 3 is guaranteed to be good in sealing performance through sealant and the like, and a built-in hygrothermograph 6 with a proper size is placed in the box body 3 to monitor the temperature and humidity in the box body.
The box body 3 is internally provided with a humidifier 5 which is used for adjusting and controlling the humidity of the test bed 4, the fluctuation range of the humidity is 20-60%, and the humidity range in the simulated air is 25-50%.
The organic glass plate of selecting vertical placing is as test bench 4, and the organic glass plate of the little cuboid shape of bonding is as the objective table of carbon fiber on test bench 4, little cuboid size for length x width 3cm x 2 cm. Two cylindrical electrodes are further bonded on the test bed 4 and respectively used as a positive electrode and a negative electrode. The cylindrical electrodes are located on two sides of the objective table and symmetrically arranged, the side faces of the cylindrical electrodes are bonded on the test bed 4, and the two bottom faces are perpendicular to the test bed 4. One end of the carbon fiber is bonded on the objective table, the height of a bonding point is higher than that of the upper bottom surface of the cylindrical electrode, and the height difference is controlled within 0.5 mm; the other end of the carbon fiber is suspended, the carbon fiber is vertically downward parallel to the organic glass plate, self gravity interference is avoided, the symmetrical bending fatigue vibration process is guaranteed to be always on the same plane, the carbon fiber is located in the middle of the two cylindrical electrodes and is parallel to the axis of the left electrode and the axis of the right electrode, and therefore the symmetry of the stress process near the left electrode and the right electrode is guaranteed. When the diameter range of the carbon fiber is 5um-100um, the length L is more than or equal to 4mm, and the length L of the fiber is more than or equal to half of the electrode spacing (2-4mm), the stable vibration of the fiber in an electric field can be realized by adjusting the proper atmosphere condition.
When the circuit is connected, the carbon fiber is in a uniform electrostatic field between the two electrodes, the carbon fiber is cyclically and alternately subjected to attractive force and repulsive force between the positive electrode and the negative electrode, and symmetric bending high-cycle fatigue behavior occurs between the two electrodes.
The amplifying circuit 9 and the counter 10 are connected in parallel and then connected in series between the positive electrode and the negative electrode of the direct current power supply 8, and the negative electrode is connected with the negative electrode of the direct current power supply 8.
The direct current power supply 8 can stably output direct current with any voltage within the range of 0kV to 6.2kV and is used for providing driving force for the carbon fiber symmetric bending high-cycle fatigue test.
The high-speed camera 11 observes the vibration of the carbon fiber under specific atmospheric conditions. High-speed camera 11 is located the positive place ahead of box 3, and the positive back of box 3 is light source 12, places the parchment 13 in the middle of box 3 and light source 12 (the effect of parchment 13 is to break up light source 12, makes the light of hitting on the carbon fiber be the homogeneity to make high-speed camera 11 shoot clear image), adjusts high-speed camera height among the test process and makes high-speed camera 11, objective table, light source 12 coaxial, and the center is located same straight line promptly. And (3) turning on the light source 12, vertically striking the object stage through the scattering of the paper sulfate 13, and adjusting the brightness of the light source 12, the exposure time of the high-speed camera 11 and the shooting speed to obtain a carbon fiber vibration image with uniform background brightness.
Example (b):
the DC power supply voltage is 2.5kV-3.5kV, the electrode spacing is 13mm, the carbon fiber type is pitch-based carbon fiber, the fiber length is 11mm, and the pitch-based carbon fiber can stably vibrate in the air through tests. The test device provided by the invention is used for carrying out high cycle fatigue test on the asphalt-based carbon fiber, and the test device comprises the following specific steps:
selecting organic glass with the thickness of 1 cm as a box material, forming a test site for a carbon fiber symmetric bending high cycle fatigue test in an atmosphere, placing a test bed provided with an asphalt-based carbon fiber monofilament, a humidifier and an industrial hygrothermograph into the box, screwing down a flange cover by screws, ensuring the air tightness of the whole box, and opening an upper vent valve and a lower vent valve;
according to the test requirement, selecting proper inert gas (nitrogen is selected in the invention), slowly introducing the nitrogen gas into the box body through the air inlet valve, in order to avoid the problem that the asphalt-based carbon fiber is broken due to the fact that the asphalt-based carbon fiber is disturbed too much by air flow, introducing the air for 1-2min until the humidity displayed by the industrial-grade hygrothermograph is reduced to 20%, continuously introducing the gas for 1min, closing the air outlet valve in order to ensure that the whole box body is filled with the gas, continuously and slowly introducing the gas until the pressure gauge B outside the box body displays that the atmospheric pressure in the box body is 0.2MPa, namely the atmospheric pressure in the box body is 0.1MPa higher than that outside the box body, closing the atmosphere source valve and. And opening the hygrothermograph and the humidifier, and adjusting the humidity in the box body to 30 percent, so far, finishing the adjustment of the atmosphere environment in the box body.
The power supply for the pitch-based carbon fiber symmetric bending test is communicated, the pitch-based carbon fiber is attracted by a certain electrode (positive electrode or negative electrode, random probability and assumed as negative electrode) in an electrostatic field to deflect until contacting the negative electrode and being charged with negative electricity, under the action of mutual repulsion of like charges and mutual attraction of heterogeneous charges, the carbon fiber deflects to the positive electrode until contacting the positive electrode, the processes are repeated, and the pitch-based carbon fiber stably performs the symmetric bending high-cycle fatigue process in a set atmosphere environment.
As shown in fig. 2, the height of the high-speed camera and the brightness of the light source are adjusted, so that the high-speed camera, the object stage and the light source are located on the same horizontal line, that is, coaxial arrangement is ensured, and parchment paper is arranged between the light source and the object stage.
The high-speed camera is used for shooting the motion trail of the whole pitch-based carbon fiber with the resolution of 1280 multiplied by 480, the shooting speed of 10000fps and the exposure time of 1/160000s, processing the image of the maximum deformation position of the pitch-based carbon fiber to obtain a carbon fiber deformation curve at the moment, and using the carbon fiber deformation curve as the boundary condition of deformation to perform mechanical simulation by using Abaqus to obtain the whole pitch; the maximum stress position and size on the pitch-based carbon fiber.
In order to research the influence of humidity and atmosphere on the symmetric bending high-cycle fatigue life and the tissue structure of the carbon fiber, the symmetric bending high-cycle fatigue test of the carbon fiber is respectively carried out in the air and in the atmosphere environment. The fatigue life of carbon fiber fatigue in air and in nitrogen atmosphere was compared, and the influence of nitrogen atmosphere on the fatigue life of carbon fiber was studied, as shown in fig. 3. The fatigue life of the pitch-based carbon fiber in air in FIG. 3 is 1.17X 105～4.39×106The service life distribution is dispersed; the fatigue life of the pitch-based carbon fiber in nitrogen is 1.67 multiplied by 106～5.58×107And 80% is at 107In the above, the service life distribution is more concentrated, which shows that the fatigue life of the pitch-based carbon fiber is remarkably improved after the nitrogen replaces the air. The influence of the nitrogen atmosphere on the fatigue fracture mechanism of the carbon fiber is researched by comparing the fatigue fracture of the carbon fiber in the air and in the nitrogen atmosphere environment, as shown in fig. 4. Observing the cross section of the fatigue fracture of the pitch-based carbon fiber obtained in the air (with the humidity of 25-35%), wherein crack sources are about 2 mu m, are short line sources and are single crack source fractures, the whole cross section is a plane, and the outer surface of the fracture is smooth as shown in fig. 4(a) and 4 (b). And the fatigue fracture cross section of the pitch-based carbon fiber obtained in a nitrogen atmosphere (with the humidity of 25-35 percent)The crack sources in the cross section are larger than 5 mu m, are obvious long line sources and are double crack sources, the two crack sources are symmetrically distributed, the outer surface of the fracture is observed, the two crack sources can be seen to form the cross section respectively after being expanded in a graph 4(c) and a graph 4(d), the height difference is 3 mu m, an oxidation layer with the thickness of about 0.5 mu m is formed on the outer surface of the asphalt-based carbon fiber in the process of a symmetrical bending high-cycle fatigue test in a nitrogen atmosphere, the initiation and the expansion of the crack are hindered, the crack sources are lengthened, and the formation of the cross section at different heights is possible. The phenomenon shows that the atmosphere conditions have obvious influence on the symmetric bending fatigue life and the fatigue fracture process of the asphalt-based carbon fiber, the atmosphere controllable test device disclosed by the invention is simple in structure and easy to operate, can create combined atmospheres with different atmosphere types and different humidity, quantitatively researches the influence of the atmosphere conditions on the fatigue life of the asphalt-based carbon fiber, qualitatively researches the fatigue fracture mechanism of the asphalt-based carbon fiber, and has important value for searching proper atmosphere conditions and improving the fatigue life of the asphalt-based carbon fiber.
Setting the voltages of a direct current power supply to be 2.5kV, 2.75kV, 3.0kV and 3.5kV respectively, shooting the vibration process of the asphalt-based carbon fiber in a nitrogen atmosphere by using a high-speed camera to obtain a carbon fiber deformation curve, and performing mechanical simulation by using a finite element numerical simulation technology Abaqus under the condition of taking the carbon fiber deformation curve as a boundary condition to obtain the maximum stress borne by the root of the carbon fiber at the maximum deformation position. Fig. 5A is a mechanical simulation result of the bending deformation of the pitch-based carbon fiber monofilament at a voltage of 3.5kV, and it can be seen from the simulation result that the root of the entire pitch-based carbon fiber is stressed maximally at 2656MPa, which meets the actual stress condition of the pitch-based carbon fiber. As shown in fig. 5B, when the voltages are 2.5kV, 2.75kV and 3.0kV, the maximum stresses applied to the root of the pitch-based carbon fiber are 533MPa, 1861MPa and 2251MPa, respectively, that is, the stress applied to the root of the pitch-based carbon fiber is gradually increased as the dc voltage is increased, and the maximum stress applied to the root is 55-80% of the tensile strength (3244 MPa). The stress analysis of the asphalt-based carbon fiber in the symmetrical bending fatigue process can be realized by using a high-speed camera and Abaqus.
Claims (1)
1. An atmosphere-controllable carbon fiber symmetric bending high-cycle fatigue test device comprises a direct-current power supply, an amplifying circuit, a counter, a test bed, a box body, an inert gas tank, a pressure gauge A, a pressure gauge B, a humidifier, a hygrothermograph, a high-speed camera, a light source and parchment paper;
when in use, the high-speed camera, the objective table, the parchment paper and the light source are coaxial and are positioned on the same horizontal line;
selecting a vertically placed organic glass plate as a test bed, bonding a small cuboid-shaped organic glass plate as an object stage of carbon fibers on the test bed, bonding two cylindrical electrodes on the test bed, wherein the cylindrical electrodes are positioned on two sides of the object stage and symmetrically arranged, the side surfaces of the cylindrical electrodes are bonded on the test bed, and the two bottom surfaces are perpendicular to the test bed; the direct current power supply stably outputs direct current with any voltage within the range of 0kV-6.2kV and is used for providing driving force for a carbon fiber symmetric bending high-cycle fatigue test;
the amplifying circuit is connected with the counter in parallel and then connected between the positive electrode and the negative electrode of the direct current power supply, and the negative electrode of the direct current power supply is directly connected with the negative electrode;
the inert gas tank is used as an atmosphere source, and the pressure gauge A regulates and controls the air inlet pressure;
an air inlet valve and an air outlet valve are arranged on the side surface of the box body, the air inlet valve is communicated with the inert gas tank through a pipeline, and the air outlet valve is communicated with the atmospheric environment;
a pressure gauge B is arranged outside the box body, and a hygrothermograph, a humidifier and a test bed are arranged in the box body;
the method is characterized in that:
the test method is used for carrying out a symmetrical bending high cycle fatigue life test on the asphalt-based carbon fiber;
the box body takes a flange cover as a top; the front and the back of the box body are respectively provided with a high-speed camera and a light source, and parchment paper is arranged between the light source and the objective table;
the thickness of the box body is 1 cm so as to bear two atmospheric pressures;
the size of the small cuboid is 3cm multiplied by 2cm multiplied by the length multiplied by the width;
one end of the carbon fiber is bonded on the objective table, the height of a bonding point is higher than that of the upper bottom surface of the cylindrical electrode, and the height difference is controlled within 0.5 mm; the other end of the carbon fiber is suspended, the carbon fiber is vertically downward and parallel to the organic glass plate, so that the interference of self gravity is avoided, the carbon fiber is always in the same plane in the symmetrical bending fatigue vibration process, and the carbon fiber is positioned in the middle of the two cylindrical electrodes and is parallel to the axes of the left electrode and the right electrode, so that the symmetry of the stress process near the left electrode and the right electrode is ensured;
when the diameter range of the fiber is 5-100 um, the length is more than or equal to 4mm, and the fiber length is more than or equal to half of the electrode distance and is plus 2-4mm, adjusting the atmosphere condition, when the circuit is connected, the carbon fiber is in a uniform electrostatic field between the two electrodes, the carbon fiber circularly and alternately receives attraction and repulsion between the positive electrode and the negative electrode, and the symmetric bending high-cycle fatigue behavior is generated between the two electrodes;
setting the voltages of a direct current power supply to be 2.5kV, 2.75kV, 3.0kV and 3.5kV respectively, shooting the vibration process of the asphalt-based carbon fiber in a nitrogen atmosphere by using a high-speed camera to obtain a carbon fiber deformation curve, and performing mechanical simulation by using a finite element numerical simulation technology Abaqus under the condition of taking the carbon fiber deformation curve as a boundary condition to obtain the maximum stress borne by the root of the carbon fiber at the maximum deformation position;
when the voltage is 2.5kV, 2.75kV and 3.0kV respectively, the maximum stress borne by the root of the asphalt-based carbon fiber is 533MPa, 1861MPa and 2251MPa respectively, namely, the stress borne by the root of the asphalt-based carbon fiber is gradually increased along with the increase of the direct-current voltage, and the maximum stress borne by the root is 55-80% of the tensile strength.
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| CN108254251A (en) | 2018-07-06 |
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