CN111023989A - FRP-FBG strain sensor fatigue test device and method - Google Patents
FRP-FBG strain sensor fatigue test device and method Download PDFInfo
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- CN111023989A CN111023989A CN201911248740.6A CN201911248740A CN111023989A CN 111023989 A CN111023989 A CN 111023989A CN 201911248740 A CN201911248740 A CN 201911248740A CN 111023989 A CN111023989 A CN 111023989A
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 26
- 230000007774 longterm Effects 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims description 24
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- 238000007906 compression Methods 0.000 claims description 14
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- 239000011159 matrix material Substances 0.000 claims description 3
- 230000036541 health Effects 0.000 abstract description 5
- 239000000835 fiber Substances 0.000 description 8
- 239000003365 glass fiber Substances 0.000 description 8
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- 239000003733 fiber-reinforced composite Substances 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 2
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- 238000006731 degradation reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000013001 point bending Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000011208 reinforced composite material Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000004083 survival effect Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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Abstract
The invention discloses a fatigue test device and method for an FRP-FBG strain sensor, wherein a beam, the FRP-FBG strain sensor and an actual measured object are consistent, the compatibility of the materials is well solved, the FRP-FBG strain sensor does not fall off in a long-term fatigue test period, the performance of the FRP-FBG strain sensor for long-term structural health monitoring and the reliability analysis of service life are improved, and meanwhile, a fatigue test method is provided. The invention is used for the technical field of fatigue tests.
Description
Technical Field
The invention relates to the technical field of fatigue tests, in particular to a fatigue test device and method for an FRP-FBG strain sensor.
Background
The Fiber Bragg Grating (FBG) sensor belongs to one type of optical Fiber sensors, and the sensor principle is to acquire the change information of an external physical quantity by modulating the Fiber Bragg Grating wavelength, and is a wavelength modulation type sensor. The fiber grating sensor can realize direct measurement of temperature and strain, can be attached to the surface of a structure or embedded in the structure in advance, can carry out health detection on the structure at the same time, and can analyze the damage condition of the structure after being damaged by impact, corrosion and the like. In recent years, the fiber grating sensor can be directly embedded or packaged for engineering structure monitoring due to light weight and small diameter.
Because the bare fiber grating is fragile and is very easy to be fragile in engineering practice, the bare fiber grating needs to be used after being packaged and protected. The fiber reinforced resin composite material can be made into laminated materials through hot-press curing, is easy to design and high in strength, and therefore, the fiber reinforced resin composite material can be used as a material for packaging FBGs (fiber Bragg Grating), not only can effectively protect optical fibers, but also can ensure the integrity of FBG sensors in the manufacturing process, thereby improving the survival rate of the FBGs in the actual use.
The FBG strain sensor after the fiber reinforced composite material is packaged can be attached to the surface of a structure for monitoring the structural state and the health, but due to the difference of monitored objects, the material of the FBG sensor attached to the base body is different, so that the compatibility problem of the material is brought, the FBG is separated from the measured object during long-term service, and the use effect of the sensor system is further influenced. The fatigue test of the service life of the FBG sensor packaged by the fiber reinforced composite material is very important. The existing structural mechanics fatigue tests mainly comprise three-point bending, four-point bending and other devices, and can be used for performing fatigue tests on FBG sensors, but beams in the fatigue test devices mainly adopt metal and are not completely matched with objects (such as carbon fiber and glass fiber structural members) and working conditions applied by the sensors, and the fatigue test results possibly cause large difference compared with the running conditions in actual service, so that the guidance basis of the fatigue test results on actual use is not reliable.
Therefore, there is a need for a device and method for analyzing the reliability of the health monitoring performance and lifetime of the fiber grating sensor structure.
Disclosure of Invention
The invention aims to provide a fatigue test device and method for an FRP-FBG strain sensor, which can improve long-term monitoring performance and reliability analysis of service life.
The technical scheme adopted by the invention is as follows:
a fatigue test device for an FRP-FBG strain sensor comprises a test bed, wherein two support bases arranged at intervals are arranged on the test bed, a beam is arranged between the two support bases, the two support bases and the beam form a simply supported beam structure, the two ends of the beam are provided with test piece baffles, the inner sides of the two supporting bases are also provided with a first left limiting baffle and a first right limiting baffle, the first left and right limit baffles can limit the beam to move left and right, FRP-FBG strain sensors are adhered to the upper and lower surfaces of the beam, compression rollers are arranged on two sides of the FRP-FBG strain sensor, the two compression rollers are arranged on the beam, a loading structural member for applying load to the beam is arranged between the two compression rollers, and a connecting piece is fixed at the upper end of the loading structural piece through a screw, the connecting piece is connected with a vibration shaft of a fatigue testing machine, and the beam is made of the same material as the FRP-FBG strain sensor.
As further improvement of the technical scheme of the invention, the length directions of the two supporting bases can be adjusted to meet the requirements of beams with different sizes.
As a further improvement of the technical scheme of the invention, a plurality of slide rails which are arranged in parallel at intervals are arranged on the test bed, and the two supporting bases are respectively arranged in the slide rails.
As further improvement of the technical scheme of the invention, a plurality of clamps are fixedly arranged on the support base and the test piece baffle, and the clamps are fixed in the slide rail.
Further as an improvement of the technical scheme of the invention, the surface of the clamp is provided with a bolt, and a cushion block is arranged between the clamp and the test bed and is locked and fixed through the bolt.
As further improvement of the technical scheme of the invention, the two sides of the compression roller also comprise a second left and right limiting baffle, and the second left and right limiting baffle and the first left and right limiting baffle are staggered with each other to limit the left and right sliding of the beam.
As further improvement of the technical scheme of the invention, the FRP-FBG strain sensor is symmetrically stuck and fixed on the upper surface and the lower surface of the beam by adopting an adhesive consistent with the material matrix of the beam.
As a further improvement of the technical scheme of the invention, the FRP-FBG strain sensor comprises two layers of FRP cloth and an FBG sensor arranged in the two layers of FRP cloth.
A fatigue test method for an FRP-FBG strain sensor comprises the following steps:
s1: determining the material of the beam and the FRP material in the FRP-FBG strain sensor according to the material of the object to be measured, manufacturing the FRP-FBG strain sensor, and respectively sticking a plurality of FRP-FBG strain sensors on the upper surface and the lower surface of the beam by using adhesives;
s2: symmetrically placing the two support bases on a test bed, placing a beam on the two support bases, enabling the FRP-FBG strain sensor to be located under a vibration shaft, adjusting the distance of the support bases to enable the test piece baffle to be in contact with the end faces of two ends of the beam, and fixing the first left and right limiting baffles on two sides of the support bases;
s3: placing a loading structural part above the beam, connecting the connecting part with the loading structural part through a screw, then connecting the connecting part with the vibration shaft, and fixing a second left limiting baffle and a second right limiting baffle on two sides of the compression roller through screws;
s4: moving the whole supporting base left and right to enable the beam to be positioned between the first left and right limiting baffle and the second left and right limiting baffle, ensuring that the beam does not move left and right in the fatigue test process, and then fixing the supporting base by using a clamp and a cushion block;
s5: according to the actual fatigue working condition of the measured object, confirming the maximum deformation of the beam, and setting the axial displacement of the vibration shaft, wherein the deformation of the beam is consistent with the fatigue test working condition of the measured object;
s6: and acquiring strain values of the FRP-FBG strain sensor on the beam at intervals, and judging the reliability of the FRP-FBG strain sensor in long-term fatigue test monitoring on the measured object through data.
The invention has the beneficial effects that: the fatigue test device for the FRP-FBG strain sensor has the advantages that the beam and the FRP-FBG strain sensor are consistent with the actual material of the measured object, the compatibility of the material is well solved, the FRP-FBG sensor does not fall off during long-term fatigue test, the performance of the FRP-FBG strain sensor for long-term structural health monitoring and the reliability analysis of the service life are improved, and meanwhile, the fatigue test method is provided.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic view of an overall apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a beam structure with FRP-FBG strain sensors installed in the embodiment of the invention;
FIG. 3 is a schematic diagram of an FRP-FBG strain sensor according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1-3, an FRP-FBG strain sensor fatigue test device includes a test bed 100, two support bases 200 arranged at an interval are installed on the test bed 100, a beam 300 is installed between the two support bases 200, the two support bases 200 and the beam 300 form a simply supported beam structure, test piece baffles 301 are arranged at two ends of the beam 300, the test piece baffles 301 are used for limiting the forward and backward sliding of the beam, and the beam 300 is a fiber reinforced composite beam. The inner sides of the two supporting bases 200 are further provided with a first left limiting baffle 201 and a first right limiting baffle 201, the first left limiting baffle 201 and the first right limiting baffle 201 can limit the beam 300 to move left and right, the upper surface and the lower surface of the beam 300 are pasted with an FRP-FBG strain sensor 400, two sides of the FRP-FBG strain sensor 400 are provided with compression rollers 500, the two compression rollers 500 are installed on the beam 300 and are bilaterally symmetrical in the length direction, a loading structural member 600 used for applying a load to the beam 300 is installed between the two compression rollers 500, a connecting member 700 is fixed to an upper end screw of the loading structural member 600, the connecting member 700 is connected with a vibration shaft of a fatigue testing machine, the beam 300 and the FRP-FBG strain sensor 400 are made of the same. The deformation of the beam 300 between the loading structural member 600 and the two press rollers 500 is consistent, so that a plurality of FRP-FBG strain sensors can be adhered to the same surface of the beam, and the reliability of fatigue performance degradation analysis of the FRP-FBG strain sensors can be improved.
In one embodiment, the FRP-FBG strain sensor 400 is attached to the surface of the fiber reinforced composite beam at the measurement point position through a J-135 epoxy structure. The J-135 epoxy resin structural adhesive is a high-toughness resin-based adhesive, the matrix of the adhesive is resin and is consistent with that of a fiber reinforced composite beam, and the adhesion reliability of the two materials is improved.
In the present embodiment, the length directions of the two supporting bases 200 can be adjusted to satisfy beams 300 with different sizes. Specifically, the test bed 100 is provided with a plurality of spaced parallel slide rails 101, and the two support bases 200 are respectively installed in the slide rails 101. The supporting base 200 and the specimen baffle 301 are fixedly provided with a plurality of clamps 800, and the clamps 800 are fixed in the slide rails 101. The surface of the clamp 800 is provided with a bolt, and a cushion block is arranged between the clamp 800 and the test bed 100 and is locked and fixed by the bolt.
Optionally, the two sides of the pressing roller 500 further include a second left-right limit baffle 501, and the second left-right limit baffle 501 and the first left-right limit baffle 201 limit the left-right sliding of the beam 300 by being staggered with each other. The FRP-FBG strain sensors 400 are attached and fixed to the upper surface of the beam 300 by using an adhesive agent corresponding to the material substrate of the beam 300 in a vertically symmetrical manner.
The FRP-FBG strain sensor 400 includes two glass fiber cloths and an FBG sensor disposed in the two glass fiber cloths. The FBG sensor is used for measuring the surface strain of the glass fiber reinforced composite material beam, and the glass fiber cloth is used for packaging the FBG sensor, so that the effective protection of the FBG sensor is realized, and the survival rate and the sensitivity of the FBG sensor are improved. The glass fiber cloth is made of the same material as the beam 300, has the same elastic modulus, increases the compatibility of the two pasting surfaces, and improves the transmission efficiency of strain on the two pasting surfaces.
A fatigue test method for an FRP-FBG strain sensor comprises the following steps:
s1: determining that a manufacturing material of the beam 300 and a manufacturing material of the FRP-FBG strain sensor 400 are glass fiber reinforced composite materials according to a material of the wind power blade of the object to be measured, placing the FBG sensors in two layers of glass fiber cloth to manufacture the FRP-FBG strain sensor 400, respectively adhering 4 FRP-FBG strain sensors 400 to the upper surface and the lower surface of the beam 300 by J-135 epoxy resin structure adhesive, centering in the length direction, and symmetrical in pairs along the center line in the width direction;
s2: the two supporting bases 200 are symmetrically placed on the test bed 100 and aligned in the left-right direction, the front-back direction is symmetrical to the vibration axis of the fatigue testing machine, the beam 300 with the FRP-FBG strain sensor 400 bonded is placed on the two supporting bases 200, the FRP-FBG strain sensor 400 is located right below the vibration axis, the distance between the supporting bases 200 is adjusted to enable the test piece baffle 301 to be in contact with the end faces of the two ends of the beam 300, and the first left-right limiting baffle 201 is fixed on the two sides of the supporting bases 200;
s3: placing a loading structural member 600 above the beam 300, connecting the connecting member 700 with the loading structural member 600 by using screws, and then connecting the connecting member with the vibration shaft, and fixing the second left and right limiting baffles 501 at two sides of the compression roller 500 by using screws;
s4: moving the supporting base 200 integrally left and right to enable the beam 300 to be positioned between the first left and right limit baffle 201 and the second left and right limit baffle 501, ensuring that the beam 300 does not move left and right in the fatigue test process, and then fixing the supporting base 200 by using a clamp 800 and a cushion block;
s5: according to the actual fatigue working condition of the wind power blade, the maximum deformation of the beam 300 is confirmed, the axial displacement of the vibration shaft is set, and the deformation size of the beam 300 is consistent with the fatigue test working condition of the wind power blade;
s6: because the vibration frequency of the wind power blade in the fatigue test is millions of times, strain values of the FRP-FBG strain sensor 400 on the beam 300 are collected at intervals, whether the FRP-FBG strain sensor 9 is in degumming, grid region fracture and other conditions and fatigue vibration performance degradation conditions in the long-term fatigue test process are observed through data, and the strain values are sequentially used as reliability criteria for judging the long-term fatigue test monitoring of the FRP-FBG strain sensor 400 on the wind power blade.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (9)
1. The fatigue test device for the FRP-FBG strain sensor is characterized by comprising a test bed, wherein two supporting bases are arranged on the test bed at intervals, a beam is arranged between the two supporting bases, the two supporting bases and the beam form a simple beam structure, test piece baffles are arranged at two ends of the beam, a first left limiting baffle and a first right limiting baffle are further arranged on the inner sides of the two supporting bases, the first left limiting baffle and the first right limiting baffle can limit the beam to move left and right, the FRP-FBG strain sensor is adhered to the upper surface and the lower surface of the beam, compression rollers are arranged at two sides of the FRP-FBG strain sensor, the two compression rollers are arranged on the beam, a loading structural member for applying load to the beam is arranged between the two compression rollers, a connecting member is fixed at the upper end of the loading structural member by a screw, and is connected with a vibration, the beam is made of the same material as the FRP-FBG strain sensor.
2. The FRP-FBG strain sensor fatigue test device of claim 1, characterized in that: the length directions of the two supporting bases can be adjusted to meet the requirements of beams with different sizes.
3. The FRP-FBG strain sensor fatigue test device of claim 2, characterized in that: the test bed is provided with a plurality of slide rails which are arranged in parallel at intervals, and the two support bases are respectively arranged in the slide rails.
4. The FRP-FBG strain sensor fatigue test device of claim 3, characterized in that: and a plurality of clamps are fixedly arranged on the supporting base and the test piece baffle, and the clamps are fixed in the slide rail.
5. The FRP-FBG strain sensor fatigue test device of claim 4, characterized in that: and a bolt is arranged on the surface of the clamp, and a cushion block is arranged between the clamp and the test bed and is locked and fixed through the bolt.
6. The FRP-FBG strain sensor fatigue test device of claim 1, characterized in that: the two sides of the compression roller further comprise a second left and right limiting baffle, and the second left and right limiting baffle and the first left and right limiting baffle limit the left and right sliding of the beam through mutual dislocation.
7. The FRP-FBG strain sensor fatigue test device of claim 1, characterized in that: the FRP-FBG strain sensor is symmetrically stuck and fixed on the upper surface and the lower surface of the beam by adopting an adhesive consistent with a beam material matrix.
8. The FRP-FBG strain sensor fatigue test device of claim 1, characterized in that: the FRP-FBG strain sensor comprises two layers of FRP cloth and an FBG sensor arranged in the two layers of FRP cloth.
9. A fatigue test method for an FRP-FBG strain sensor is characterized by comprising the following steps:
s1: determining the material of the beam and the FRP material in the FRP-FBG strain sensor according to the material of the object to be measured, manufacturing the FRP-FBG strain sensor, and respectively sticking a plurality of FRP-FBG strain sensors on the upper surface and the lower surface of the beam by using adhesives;
s2: symmetrically placing the two support bases on a test bed, placing a beam on the two support bases, enabling the FRP-FBG strain sensor to be located under a vibration shaft, adjusting the distance of the support bases to enable the test piece baffle to be in contact with the end faces of two ends of the beam, and fixing the first left and right limiting baffles on two sides of the support bases;
s3: placing a loading structural part above the beam, connecting the connecting part with the loading structural part through a screw, then connecting the connecting part with the vibration shaft, and fixing a second left limiting baffle and a second right limiting baffle on two sides of the compression roller through screws;
s4: moving the whole supporting base left and right to enable the beam to be positioned between the first left and right limiting baffle and the second left and right limiting baffle, ensuring that the beam does not move left and right in the fatigue test process, and then fixing the supporting base by using a clamp and a cushion block;
s5: according to the actual fatigue working condition of the measured object, confirming the maximum deformation of the beam, and setting the axial displacement of the vibration shaft, wherein the deformation of the beam is consistent with the fatigue test working condition of the measured object;
s6: and acquiring strain values of the FRP-FBG strain sensor on the beam at intervals, and judging the reliability of the FRP-FBG strain sensor in long-term fatigue test monitoring on the measured object through data.
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| CN113834434A (en) * | 2021-07-20 | 2021-12-24 | 重庆万桥交通科技发展有限公司 | Bare fiber grating sensor packaging structure and packaging method |
| CN114088026A (en) * | 2022-01-20 | 2022-02-25 | 江苏奥琳斯邦装备科技股份有限公司 | Hot-pressing curing device and curing method for strain measurement |
| CN114088026B (en) * | 2022-01-20 | 2022-04-05 | 江苏奥琳斯邦装备科技股份有限公司 | Hot-pressing curing device and curing method for strain measurement |
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