CN108181029B - Method for monitoring strain of fiber reinforced composite material in multiple directions by carbon nano paper sensor - Google Patents
Method for monitoring strain of fiber reinforced composite material in multiple directions by carbon nano paper sensor Download PDFInfo
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- CN108181029B CN108181029B CN201810022501.8A CN201810022501A CN108181029B CN 108181029 B CN108181029 B CN 108181029B CN 201810022501 A CN201810022501 A CN 201810022501A CN 108181029 B CN108181029 B CN 108181029B
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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Abstract
The invention provides a method for monitoring the strain of a fiber reinforced composite material in multiple directions by a carbon nano paper sensor, 24 electrodes are uniformly arranged on the circumference of the surface of the carbon nanopaper with the center point of the carbon nanopaper as the center of a circle, selecting the direction needing strain monitoring according to the actual mechanical experiment requirements of the fiber composite material to be monitored, selecting two wires in each selected direction to be respectively connected with the two electrodes in the direction to form a carbon nano paper sensor, pasting the carbon nano paper sensor at the central position of the surface of the fiber composite material to be monitored, respectively collecting resistance change values of the carbon nano paper sensor in each direction by using a universal meter to obtain a resistance change-fiber composite material strain relation curve, and fitting to obtain strain sensing coefficients in all directions, and realizing multi-directional monitoring of the strain of the fiber composite material. The monitoring method is simple to operate, accurate in monitoring result, capable of realizing multi-directional monitoring and high in applicability.
Description
The technical field is as follows:
the invention belongs to the field of composite material health monitoring, and particularly relates to a method for monitoring the strain of a fiber reinforced composite material in multiple directions by a carbon nano paper sensor.
Background art:
the fiber reinforced composite material has the advantages of high specific strength, large specific rigidity, good fatigue resistance, designable material performance and the like, thereby being widely applied to the engineering fields of aviation, aerospace, ships, automobiles and the like. However, since the fiber-reinforced composite material is a multiphase material composed of fibers, a matrix and an interfacial phase, and belongs to a typical anisotropic material, various forms of internal damage and destruction such as fiber fracture, interfacial debonding, matrix cracking and delamination are easily generated under the action of actual engineering strain load, and all these factors reduce the reliability and safety of the use of the composite material. Therefore, the method for monitoring the strain behavior and even damage failure of the fiber reinforced composite material under the action of load has important significance for wider application of the composite material.
For the fiber reinforced composite material strain behavior monitoring method, the most common is the traditional strain gauge electrical measurement technology, which has many advantages of high precision, wide measurement range, good frequency response characteristic and the like, but to realize the multi-direction monitoring of the composite material, a plurality of strain gauges are required to be simultaneously pasted, the layout of pasting circuits is very complicated, the magnitude and the direction of main strain in a plane stress field can only be determined by applying strain rosettes, and the multi-direction strain state cannot be measured independently. In addition, the fiber grating sensor is also suitable for long-term monitoring work of structural strain information under complex conditions, and multipoint and multidirectional strain monitoring can be simply realized by reasonably arranging and controlling the fiber grating. However, the fiber diameter, although small, is still nearly two orders of magnitude larger than the fiber diameter after embedding it as a sensing element in a composite material. This is equivalent to introducing an artificial defect in the composite material from the mechanical category, thereby having a certain influence on the mechanical properties of the composite material.
The invention content is as follows:
aiming at the problems in the prior art, the invention provides a method for monitoring the strain of a fiber reinforced composite material in multiple directions by a carbon nano paper sensor, aiming at simply and directly monitoring the strain change of the fiber reinforced composite material in multiple directions.
The technical scheme for realizing the purpose of the invention is carried out according to the following steps:
(1) uniformly arranging 24 electrodes on the surface of the carbon nano paper in a shape of a centrosymmetric graph on a circumference taking the center point of the carbon nano paper as the center of a circle;
(2) setting: two leads are respectively connected to two electrodes which are symmetrical about the center point of the carbon nano paper and are used for monitoring the strain in a determined direction;
(3) selecting the direction needing strain monitoring according to the actual mechanical experiment requirements of the fiber composite material to be monitored, selecting two leads to be respectively connected to corresponding electrodes in each selected direction to form a carbon nano paper sensor, pasting the carbon nano paper sensor on the central position of the surface of the fiber composite material to be monitored, and then curing and molding by utilizing a vacuum bag molding process;
(4) respectively acquiring resistance change values delta R of the carbon nano paper sensor in all directions by using a universal meter to obtain a resistance change delta R-fiber composite material strain epsilon relation curve of the fiber composite material to be monitored in the process of carrying out a mechanical experiment; according to the formula
Wherein, Delta R is the resistance change value of the carbon nano-paper sensor, epsilon is the strain value of the fiber composite material to be monitored, R0The initial resistance of the carbon nano paper sensor is used, S is a strain sensing coefficient, the strain sensing coefficient S in each direction is obtained through fitting, and multi-direction monitoring of the strain of the fiber composite material is achieved.
And the leads are fixed on the electrodes by adopting conductive silver adhesive.
Preferably, the carbon nanopaper is circular carbon nanopaper.
Compared with the prior art, the invention has the following beneficial effects:
the microscopic three-dimensional network structure of the carbon nano paper and the fiber reinforced composite material adopted by the invention have good interface bonding performance, can be integrally formed with the composite material, cannot influence the mechanical property of the composite material, and simultaneously overcomes the problems that the fiber grating sensor has larger size and can influence the structural performance when being embedded in the composite material structure.
On the carbon nanometer paper, evenly set up 24 electrodes on the circumference of using carbon nanometer paper central point as the centre of a circle, according to the actual mechanics experiment requirement of the fibre composite material of waiting to monitor, select the direction that needs to carry out the monitoring of meeting an emergency, realized the selection of a plurality of monitoring directions, it is nimble more convenient.
Selecting two leads in each selected direction to be respectively connected to corresponding electrodes to form a carbon nano paper sensor, respectively collecting resistance change values delta R of the carbon nano paper sensor in each direction by utilizing a universal meter to obtain a resistance change delta R-fiber composite material strain epsilon relation curve of the fiber composite material to be monitored in the process of carrying out a mechanical experiment, further fitting a strain sensing coefficient S, and realizing multi-directional monitoring of the fiber reinforced composite material strain by visually observing the strain sensing coefficient S.
The carbon nanopaper is circular, and the electrodes are arranged in a circle, so that the distance between any two electrodes which are symmetrical about the center point of the carbon nanopaper is consistent (the diameter distance is the same), and the influence caused by the distance between the electrodes introduced in different directions during measurement is avoided.
Description of the drawings:
FIG. 1 is a schematic diagram of electrode distribution and wire bonding of a carbon nanopaper sensor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the bonding position of a carbon nanopaper sensor and a fiber-reinforced composite material to be monitored according to an embodiment of the present invention;
fig. 3 is a graph of resistance change versus strain of a carbon nanopaper sensor according to an embodiment of the present invention.
In the figure, 1 to 24 represent 24 electrodes, i-carbon nanopaper, ii-lead, iii-carbon nanopaper sensor, IV-fiber reinforced composite material to be monitored, which are uniformly arranged.
The specific implementation mode is as follows:
the following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The carbon nanopaper adopted in the embodiment of the invention is the carbon nanopaper prepared in patent application CN2012104391772 (a preparation method of a temperature sensor based on a carbon nanotube three-dimensional network film). And cutting a circular sheet-shaped structural unit with the diameter of 50mm from the carbon nano paper to obtain the circular carbon nano paper. In other embodiments, a rectangular, square, etc. centrosymmetric pattern may be cut.
The fiber reinforced composite material to be monitored adopted in the embodiment of the invention is 8 layers of glass fiber/epoxy resin.
The fiber reinforced composite material to be monitored adopted in the embodiment of the invention is subjected to a static uniaxial tension experiment.
The method for monitoring the strain of the fiber reinforced composite material in multiple directions by the carbon nanopaper sensor comprises the following steps:
(1) on the surface of the round carbon nanopaper I, 24 electrodes are uniformly arranged on the circumference which takes the center point of the carbon nanopaper I as the center of a circle, the number is 1 to 24, namely the center angle between two adjacent electrodes is 15 degrees, as shown in figure 1;
(2) setting: two leads are respectively connected to two electrodes which are point-symmetric about the center of the carbon nano paper I and are used for monitoring the strain in a determined direction;
(3) selecting No. 1 and No. 13 position electrodes for measuring the strain in the direction of 0 degree, and further selecting two wires II which are respectively bonded on the No. 1 and No. 13 electrodes; selecting No. 4 and No. 16 position electrodes for measuring the strain in the direction of 45 degrees, and further selecting two wires II which are respectively bonded on the No. 4 and No. 16 electrodes; selecting No. 7 and No. 19 position electrodes for measuring the strain in the 90-degree direction, further selecting two leads II, respectively bonding the two leads II on the No. 7 and No. 19 electrodes, finally forming carbon nano paper sensors III for monitoring the three directions (0 degree, 45 degrees and 90 degrees), externally bonding the carbon nano paper sensors III connected with the leads II to the central position of the surface of the fiber composite material IV to be monitored, as shown in figure 2, and then curing and molding by utilizing a vacuum bag molding process;
(4) in the static uniaxial tension experiment process of the molded fiber composite material IV to be monitored, respectively collecting resistance change values delta R of the carbon nano paper sensor III in the three directions by using a universal meter to obtain a resistance change delta R-fiber composite material strain epsilon relation curve of the fiber composite material IV to be monitored in the static uniaxial tension experiment process, wherein the resistance change delta R-fiber composite material strain epsilon relation curve is shown in figure 3;
according to the formula
Wherein, Delta R is the resistance change value of the carbon nano-paper sensor, epsilon is the strain value of the fiber composite material to be monitored, R0The initial resistance of the carbon nano paper sensor is used, S is a strain sensing coefficient, the strain sensing coefficient S in each direction is obtained through fitting, and the multi-direction monitoring of the strain of the fiber composite material is realized through visually observing the change of the strain sensing coefficient S.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.
Claims (2)
1. A method for monitoring the strain of a fiber composite material in multiple directions by a carbon nano paper sensor is characterized by comprising the following steps:
(1) uniformly arranging 24 electrodes on the surface of the carbon nano paper in a shape of a centrosymmetric graph on a circumference taking the center point of the carbon nano paper as the center of a circle;
(2) setting: two leads are respectively connected to two electrodes which are symmetrical about the center point of the carbon nano paper and are used for monitoring the strain in a determined direction;
the conducting wire is fixed on the electrode by conductive silver adhesive;
(3) selecting the direction needing strain monitoring according to the actual mechanical experiment requirements of the fiber composite material to be monitored, selecting two leads to be respectively connected to corresponding electrodes in each selected direction to form a carbon nano paper sensor, pasting the carbon nano paper sensor on the central position of the surface of the fiber composite material to be monitored, and then curing and molding by utilizing a vacuum bag molding process;
(4) respectively collecting by using universal meterThe resistance change value delta R of the carbon nano paper sensor in each direction is used for obtaining a resistance change delta R-fiber composite material strain epsilon relation curve of the fiber composite material to be monitored in the process of carrying out a mechanical experiment; according to the formula
Wherein, Delta R is the resistance change value of the carbon nano-paper sensor, epsilon is the strain value of the fiber composite material to be monitored, R0The initial resistance of the carbon nano paper sensor is used, S is a strain sensing coefficient, the strain sensing coefficient S in each direction is obtained through fitting, and multi-direction monitoring of the strain of the fiber composite material is achieved.
2. The method for multidirectional monitoring of fiber composite strain by using carbon nanopaper sensors according to claim 1, wherein the method comprises the following steps: the carbon nanopaper is round carbon nanopaper.
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| CN109808113A (en) * | 2019-01-28 | 2019-05-28 | 沈阳航空航天大学 | A kind of preparation method of the flexibility sensor based on carbon nanometer paper |
| CN111175352B (en) * | 2020-01-08 | 2022-07-08 | 沈阳航空航天大学 | Micro-nano sensor structure health monitoring method combined with flexible circuit |
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