CN111751213A - Device for testing tensile rigidity and adhesive force of coating - Google Patents
Device for testing tensile rigidity and adhesive force of coating Download PDFInfo
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- CN111751213A CN111751213A CN202010670162.1A CN202010670162A CN111751213A CN 111751213 A CN111751213 A CN 111751213A CN 202010670162 A CN202010670162 A CN 202010670162A CN 111751213 A CN111751213 A CN 111751213A
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- stretching rod
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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
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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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
- G01N3/02—Details
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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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
Abstract
The invention provides a device for testing the tensile rigidity and the adhesive force of a coating, and belongs to the technical field of measurement. This tensile rigidity of coating and adhesive force testing arrangement, include the screw rod, revolve twist the handle, change the groove, tensile pole, protective housing, ball-type draw-in groove, coating glue head, FBG optic fibre, Fabry-Perot optic fibre, reflector, liftable support, optic fibre protective housing, fixing bolt, instrument shell and connecting piece. The device is based on the optical fiber sensing principle, and the optical fiber sensor is adopted to accurately test the tensile rigidity and the adhesive force of the coating at the same time, so that the properties of the coating material are truly reflected. The method has the advantages of high sensitivity, simple operation, strong practicability, wide application prospect and wide popularization market.
Description
Technical Field
The invention belongs to the technical field of measurement, and particularly relates to a device for testing the tensile rigidity and the adhesive force of a coating.
Background
In recent years, with the continuous maturity of science and technology, coatings are widely applied to various industries and are mainly used for protection, insulation and decoration of metal and non-metal materials. However, different coating materials have different properties that often determine the intended effectiveness, useful life and durability of the coating, thereby affecting the use of the coated material. Therefore, the properties of the coating material can be known as much as possible, the use efficiency can be greatly improved, and a better protection effect can be achieved.
Among the properties associated with the use of coatings, tensile stiffness and adhesion are particularly important, which determine the degree of resistance of the coating material to external damage and to falling off. Therefore, the mechanical property and the protective capability of the material can be better known by measuring the tensile rigidity and the adhesive force of the coating material. At present, many commercial coating adhesion testers can only measure the coating adhesion singly, and cannot measure the tensile deformation and the tensile rigidity of the coating under the action of tensile force.
Due to the advantages of high sensitivity, strong adaptability and datamation, various optical fiber sensors are developed for measuring deformation, temperature and corrosion. The Fabry-Perot optical fiber sensor can accurately measure the nano deformation, so that the Fabry-Perot optical fiber sensor can be used for measuring the micro tensile deformation of the coating under the action of external force. The FBG optical fiber sensor can accurately measure the strain, so that the tensile force can be measured by measuring the strain of the stressed part in the tensile test. Compared with other testing methods, the device for testing the tensile rigidity and the adhesive force of the coating has the advantages of higher precision, convenience and simplicity in operation, low testing cost, clear obtained data and the like, can be used for testing the tensile rigidity and the adhesive force of the coating at the same time, and is better suitable for application in the aspect of coating materials.
Disclosure of Invention
In order to solve the technical problems, the invention provides a device for testing the tensile rigidity and the adhesive force of a coating, which is based on the optical fiber sensing principle and has the greatest characteristic that the tensile rigidity and the adhesive force of the coating can be simultaneously measured, and the properties of the coating material can be more accurately and comprehensively known.
The technical scheme of the invention is as follows:
a device for testing the tensile rigidity and the adhesive force of a coating comprises a screw rod 1, a screwing handle 2, a rotary groove 3, a stretching rod 4, a protective shell 5, a spherical clamping groove 6, a coating adhesive head 7, an FBG optical fiber 8, a Fabry-Perot optical fiber 9, a reflector 10, a lifting support 11, an optical fiber protective shell 12, a fixing bolt 13, an instrument shell 14 and a connecting piece 15;
the instrument shell 14 is of a door-shaped structure;
the Fabry-Perot optical fiber 9 is a coating tensile deformation monitoring unit; the FBG optical fiber 8 is a coating tensile force monitoring unit;
the screw rod 1 penetrates through the instrument shell 14, and the part of the screw rod, which is positioned outside the instrument shell 14, is clamped and fixed through the rotary groove 3; the lower end of the screw rod 1 is connected with a stretching rod 4 through a connecting piece 15; the outer part of the stretching rod 4 is sleeved with a protective shell 5, the lower end of the stretching rod is connected with a spherical clamping groove 6, and the connecting piece 15 is clamped in the door frame and can only move up and down to connect the screw rod 1 and the stretching rod 4;
the rotary groove 3 is fixed in the instrument shell 14, the internal thread on the rotary groove is matched with the screw rod 1 and is used for clamping the screw rod 1, and the lower part of the rotary groove 3 and the instrument shell 14 are provided with spherical rollers to reduce the rotary resistance of the rotary groove 3 in the instrument shell 14;
the coating adhesive head 7 is arranged in the spherical clamping groove 6;
one end of the FBG optical fiber 8 is stuck on the stretching rod 4, and the strain of the stretching rod 4 is measured;
one end of the Fabry-Perot optical fiber 9 is arranged in the optical fiber protective shell 12 and fixed on the lifting bracket 11; the lower end of the Fabry-Perot optical fiber 9 is aligned with a reflector 10 fixed on the coating bonding head 7 to form an F-P optical fiber interferometer;
the lifting support 11 is arranged on a supporting leg of an instrument shell 14, and a fixing bolt 13 is arranged on the lifting support.
The screwing handle 2 is arranged on the rotary groove 3 to drive the rotary groove 3 to rotate together, so that the screw rod 1 rises due to the groove line rotation, and the connecting piece 15, the stretching rod 4, the spherical clamping groove 6 and the coating bonding head 7 are driven to rise, so that the bonding coating falls off.
The stretching rod 4 is made of a material with known stretching rigidity, and can generate micro deformation when being stretched, so that the FBG optical fiber 8 adhered to the surface of the stretching rod can feel strain, the other end of the FBG optical fiber 8 except the working end is connected with a spectrum demodulator, spectrum change is obtained through a spectrometer, and a coating adhesion force value is obtained through corresponding calculation.
When the coating sticky head 7 is pulled up, the reflecting mirror 10 is driven, so that the distance between the reflecting mirror 10 and the Fabry-Perot optical fiber 9 is slightly changed, interference is generated on light propagation in the Fabry-Perot optical fiber 9, the other end of the Fabry-Perot optical fiber 9 except the working end is connected with a spectrum demodulator, spectrum change is obtained through a spectrometer, and a coating tensile deformation value is obtained through corresponding calculation.
The lifting support 11 can freely move along the vertical direction to adjust the position of the Fabry-Perot optical fiber 9, and the position of the lifting support 11 can be fixed by a fixing bolt 13.
The upper end of the coating adhesive head 7 is spherical, so that the transmission of bending moment during stretching is avoided, and the stretching force is perpendicular to the surface of the coating.
The working principle of the invention is as follows:
the core principle of the invention is to combine the working principles of the Fabry-Perot optical fiber sensor and the Bragg optical fiber grating sensor.
The adhesion test of the coating material applies the working principle of the Bragg fiber grating sensor. When the light source emits laser light to the FBG fiber 8, light passing through the fiber grating is refracted due to the refractive index change, and the remaining light is transmitted except for light satisfying the bragg condition which is reflected. The reflected light must have a wavelength that satisfies the Bragg condition, i.e.
λ＝2neffΛ(1)
Where λ is the Bragg wavelength, neffIs the effective index, Λ is the grating period by measuring the change in grating period Λ, the amount of change Δ λ in the Bragg wavelength λ can be found, and the FBG fiber 8 strain can be found, i.e., the FBG fiber 8 strain
In which the FBG fiber 8 is strained. Therefore, when the screwing handle 2 is rotated, the stretching rod 4 is pulled through the connecting piece 15, meanwhile, the adhesive force of the coating provides a reaction force through the coating sticking head 7, so that the stretching rod 4 is stretched to generate strain, the grating period lambada is increased, the change of the corresponding Bragg wavelength lambada is obtained on a spectrometer, and the strain generated by the Bragg wavelength lambada can be reversely deduced through the spectrum change. Since the stretch rod 4 is a material with a known modulus of elasticity E and cross-sectional area a, the strain according to which it is subjected can be determined as the tensile force to which it is subjected, i.e. the adhesion of the coating:
F＝EA (3)
the tensile deformation test of the coating material applies the working principle of an external Fabry-Perot interferometer single-mode optical fiber sensor. When incident light propagates in the core of the fabry-perot fiber 9, the light will encounter the first reflecting surface (the lower end of the fabry-perot fiber 9) and the reflecting mirror 10, i.e., the second reflecting surface, and the light will be reflected back from the two interfaces. The light reflected by the first reflecting surface and the light reflected by the second reflecting surface interfere with each other, and the interference signal I can be expressed as:
wherein I1And I2The light intensity reflected by the first reflecting surface and the second reflecting surface respectively; n is the refractive index of the medium between the two interfaces (for air, n ═ 1.0),
the initial phase difference is the length of the Fabry-Perot interference cavity, namely the distance between the lower end of the Fabry-Perot optical fiber 9 and the reflector 10. The interference spectrum is approximated as a sine wave with discrete minima and the distance between two successive minima is the Free Spectral Range (FSR), i.e.
Where λ is the wavelength.
The length of the Fabry-Perot interference cavity can be determined by the formula (2), and the interference spectrum can be shifted along with the change of the length of the Fabry-Perot interference cavity. Therefore, the change of the cavity can be inversely calculated according to the displacement of the FSR,
wherein FSR1、FSR2The FSR values before and after the cavity change are respectively.
Laser enters the Fabry-Perot interference cavity through the Fabry-Perot optical fiber 9 and is continuously and directly reflected between the first reflecting surface and the second reflecting surface to form multi-beam optical interference. Along with the rotation of the screwing handle 2, the connecting piece 15, the stretching rod 4 and the coating sticky head 7 are driven to ascend, so that the reflector 10 ascends, the length of the Fabry-Perot interference cavity is changed, the propagation of optical signals is influenced, a changed spectrum image is formed, the length variation of the Fabry-Perot interference cavity can be deduced according to the formula relation, namely the stretching deformation of the coating is large, and the stretching rigidity K of the coating material can be deduced:
the invention has the beneficial effects that:
1. the invention can simultaneously test the tensile rigidity and the adhesive force of the coating, and more comprehensively test the properties of the coating material;
2. the invention adopts the optical fiber sensing technology, has high sensitivity, can reach nanometer precision and realize more accurate measurement;
3. the coating bonding heads are connected in a spherical manner, so that the transmission of bending moment during stretching is avoided, and the measured data is more accurate;
4. the invention has small volume, portability, simple operation, easy operation, no limitation by geographical factors and convenient test.
Drawings
FIG. 1 is a three-dimensional construction diagram of a coating tensile stiffness and adhesion testing apparatus;
FIG. 2 is a front view of the coating tensile stiffness and adhesion testing apparatus;
FIG. 3 is a front cross-sectional view of a coating tensile stiffness and adhesion testing apparatus;
FIG. 4 is a schematic view of a bond head of the coating tensile stiffness and adhesion testing apparatus;
FIG. 5 is a cross-sectional view taken along line A-A of a coating tensile stiffness and adhesion testing apparatus;
FIG. 6 is a cross-sectional view B-B of a coating tensile stiffness and adhesion testing apparatus;
in the figure: 1, a screw rod; 2 screwing a handle; 3, turning the groove; 4 stretching the rod; 5, a protective shell; 6, a spherical clamping groove; 7 coating and sticking head; 8FBG optical fibers; 9 Fabry-Perot fiber; 10 a reflective mirror; 11 a lifting bracket; 12 a protective optical fiber case; 13 fixing the bolt; 14 an instrument housing; 15 connecting piece.
Detailed Description
The following describes a specific embodiment of a device for testing the tensile stiffness and adhesion of a coating with reference to the accompanying drawings.
As shown in the figure, the invention provides a device for testing the tensile rigidity and the adhesive force of a coating, which comprises a screw rod 1, a screwing handle 2, a rotating groove 3, a stretching rod 4, a protective shell 5, a spherical clamping groove 6, a coating bonding head 7, an FBG optical fiber 8, a Fabry-Perot optical fiber 9, a reflector 10, a lifting support 11, an optical fiber protective shell 12, a fixing bolt 13, an instrument shell 14 and a connecting piece 15;
the Fabry-Perot optical fiber 9 is a coating tensile deformation monitoring unit; the FBG optical fiber 8 is a coating tensile force monitoring unit;
the lower part of the screw rod 1 is connected with a stretching rod 4 through a connecting piece 15 and is arranged in the rotary groove 3, and the lower end of the stretching rod 4 is connected with the spherical clamping groove 6;
the lower part of the rotary groove 3 is arranged in an instrument shell 14, a threaded rod 1 is clamped in the groove, and a roller is arranged at the lower part of the rotary groove for rotating;
the coating adhesive head 7 is arranged in the spherical clamping groove 6;
one end of the FBG optical fiber 8 is stuck to the stretching rod 4, and the strain of the stretching rod 4 is measured;
one end of the Fabry-Perot optical fiber 9 is arranged in the optical fiber protective shell 12 and is fixed on the lifting bracket 11; the lower end of the Fabry-Perot optical fiber 9 is aligned with a reflector 10 fixed on the coating bonding head 7 to form an F-P optical fiber interferometer;
the lifting support 11 is arranged on the supporting leg of the instrument shell 3, and a fixing bolt 13 is arranged on the lifting support.
The screwing handle 2 can drive the rotary groove 3 to rotate together, so that the screw rod 1 rises due to the groove rotation, and the connecting piece 15, the stretching rod 4, the spherical clamping groove 6 and the coating bonding head 7 are driven to rise, and the bonding coating falls off.
The stretching rod 4 is made of a material with known stretching rigidity, and can generate micro deformation when being stretched, so that the FBG optical fiber 8 adhered to the surface of the stretching rod can feel strain, the other end of the FBG optical fiber 8 except the working end is connected with a spectrum demodulator, spectrum change is obtained through a spectrometer, and a coating adhesion force value is obtained through corresponding calculation.
When the coating sticky head 7 is pulled up, the reflecting mirror 10 is driven, so that the distance between the reflecting mirror 10 and the Fabry-Perot optical fiber 9 is slightly changed, interference is generated on light propagation in the Fabry-Perot optical fiber 9, the other end of the Fabry-Perot optical fiber 9 except the working end is connected with a spectrum demodulator, spectrum change is obtained through a spectrometer, and a coating tensile deformation value is obtained through corresponding calculation.
The lifting support 11 can freely move along the vertical direction to adjust the position of the Fabry-Perot optical fiber 9, and the position of the lifting support 11 can be fixed by a fixing bolt 13.
The upper end of the coating adhesive head 7 is spherical, so that the transmission of bending moment during stretching is avoided, and the stretching force is perpendicular to the surface of the coating.
When the instrument is used, firstly, the coating attached to other materials is firmly bonded with the coating bonding head 7, after the instrument is stabilized, the optical fiber is connected with the spectrometer and the computer, the screwing handle 2 is rotated at a low speed, the computer displays the numerical value of the tensile rigidity according to a calculation program until the coating falls off, and the computer displays the adhesive force of the coating.
Claims (10)
1. The device for testing the tensile rigidity and the adhesive force of the coating is characterized by comprising a screw rod (1), a screwing handle (2), a rotary groove (3), a stretching rod (4), a protective shell (5), a spherical clamping groove (6), a coating bonding head (7), FBG optical fibers (8), Fabry-Perot optical fibers (9), a reflector (10), a lifting support (11), an optical fiber protective shell (12), a fixing bolt (13), an instrument shell (14) and a connecting piece (15);
the instrument shell (14) is of a structure shaped like a Chinese character 'men';
the Fabry-Perot optical fiber (9) is a coating tensile deformation monitoring unit; the FBG optical fiber (8) is a coating tensile force monitoring unit;
the screw (1) penetrates through the instrument shell (14), and the part of the screw, which is positioned outside the instrument shell (14), is clamped and fixed through the rotary groove (3); the lower end of the screw rod (1) is connected with the stretching rod (4) through a connecting piece (15); the outer part of the stretching rod (4) is sleeved with a protective shell (5), the lower end of the protective shell is connected with the spherical clamping groove (6), the connecting piece (15) is clamped in the door frame and can only move up and down, and is used for connecting the screw rod (1) and the stretching rod (4), when the screw rod (1) slightly rotates, the lower stretching rod (4) cannot be affected, and the stretching rod is used for transmitting stretching force between the screw rod (1) and the stretching rod (4);
the rotary groove (3) is fixed in the instrument shell (14), internal threads on the rotary groove are matched with the screw (1) and used for clamping the screw (1), and spherical rollers are arranged in the lower part of the rotary groove (3) and the instrument shell (14) to reduce the rotation resistance of the rotary groove (3) in the instrument shell (14);
the coating adhesive head (7) is arranged in the spherical clamping groove (6);
one end of the FBG optical fiber (8) is stuck to the stretching rod (4) to measure the strain of the stretching rod (4);
one end of the Fabry-Perot optical fiber (9) is arranged in the optical fiber protective shell (12) and fixed on the lifting bracket (11); the lower end of the Fabry-Perot optical fiber (9) is aligned with a reflector (10) fixed on the coating adhesive head (7) to form an F-P optical fiber interferometer;
the lifting support (11) is arranged on a supporting leg of the instrument shell (14), and a fixing bolt (13) is arranged on the lifting support.
2. The device for testing the tensile rigidity and the adhesive force of the coating according to claim 1, wherein the screwing handle (2) is installed on the rotary groove (3) and drives the rotary groove (3) to rotate together, so that the screw rod (1) ascends due to the flute rotation, and the connecting piece (15), the stretching rod (4), the spherical clamping groove (6) and the coating sticking head (7) are driven to ascend, so that the adhesive coating falls off.
3. The coating tensile rigidity and adhesion force testing device according to claim 1 or 2, characterized in that the stretching rod (4) is made of a material with known tensile rigidity, and when stretched, the stretching rod generates a small deformation to make the FBG (fiber Bragg Grating) fiber (8) adhered to the surface of the stretching rod feel strain, the other end of the FBG fiber (8) except the working end is connected with a spectrum demodulator, spectrum change is obtained through a spectrometer, and corresponding calculation is carried out to obtain a coating adhesion force value.
4. The coating tensile rigidity and adhesion force testing device according to claim 1 or 2, wherein the coating sticky head (7) drives the reflective mirror (10) when being pulled upwards, so that the distance between the reflective mirror (10) and the Fabry-Perot optical fiber (9) is slightly changed, interference is generated on light transmission in the Fabry-Perot optical fiber (9), the other end of the Fabry-Perot optical fiber (9) except the working end is connected with a spectrum demodulator, spectrum change is obtained through a spectrometer, and a coating tensile deformation value is obtained through corresponding calculation.
5. The device for testing the tensile rigidity and the adhesive force of the coating according to claim 3, wherein when the coating sticky head (7) is subjected to a tensile force to rise, the reflective mirror (10) is driven, so that the distance between the reflective mirror (10) and the Fabry-Perot optical fiber (9) is slightly changed, interference is generated on light transmission in the Fabry-Perot optical fiber (9), the other end of the Fabry-Perot optical fiber (9) except the working end is connected with a spectrum demodulator, spectrum change is obtained through a spectrometer, and a coating tensile deformation value is obtained through corresponding calculation.
6. The coating tensile rigidity and adhesion force testing device according to claim 1, 2 or 5, wherein the liftable support (11) can freely move in the vertical direction to adjust the position of the Fabry-Perot optical fiber (9), and the liftable support (11) is fixed by a fixing bolt (13).
7. The coating tensile rigidity and adhesion force testing device according to claim 3, wherein the liftable support (11) can freely move in the vertical direction to adjust the position of the Fabry-Perot optical fiber (9), and the liftable support (11) is fixed by a fixing bolt (13).
8. The coating tensile rigidity and adhesion force testing device according to claim 4, wherein the liftable support (11) can freely move in the vertical direction to adjust the position of the Fabry-Perot optical fiber (9), and the liftable support (11) is fixed by a fixing bolt (13).
9. The coating tensile rigidity and adhesion testing device according to claim 1, 2, 5, 7 or 8, characterized in that the upper end of the coating bonding head (7) is spherical, so as to avoid the transmission of bending moment during stretching and ensure that the tensile force is perpendicular to the coating surface.
10. The coating tensile rigidity and adhesion force testing device according to claim 6, wherein the upper end of the coating bonding head (7) is spherical, so that the transmission of bending moment during stretching is avoided, and the tensile force is perpendicular to the surface of the coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010670162.1A CN111751213A (en) | 2020-07-13 | 2020-07-13 | Device for testing tensile rigidity and adhesive force of coating |
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| CN202010670162.1A CN111751213A (en) | 2020-07-13 | 2020-07-13 | Device for testing tensile rigidity and adhesive force of coating |
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| CN202010670162.1A Pending CN111751213A (en) | 2020-07-13 | 2020-07-13 | Device for testing tensile rigidity and adhesive force of coating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117054239A (en) * | 2023-10-09 | 2023-11-14 | 四川吉盛印铁有限公司 | Adhesive force testing device and method for surface coating of metal packaging plate |
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2020
- 2020-07-13 CN CN202010670162.1A patent/CN111751213A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117054239A (en) * | 2023-10-09 | 2023-11-14 | 四川吉盛印铁有限公司 | Adhesive force testing device and method for surface coating of metal packaging plate |
| CN117054239B (en) * | 2023-10-09 | 2023-12-19 | 四川吉盛印铁有限公司 | Adhesive force testing device and method for surface coating of metal packaging plate |
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