CN118090466A - Carbon fiber interface strength testing method - Google Patents
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- CN118090466A CN118090466A CN202410518417.0A CN202410518417A CN118090466A CN 118090466 A CN118090466 A CN 118090466A CN 202410518417 A CN202410518417 A CN 202410518417A CN 118090466 A CN118090466 A CN 118090466A
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 103
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 103
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 238000012360 testing method Methods 0.000 title claims abstract description 40
- 239000011347 resin Substances 0.000 claims abstract description 110
- 229920005989 resin Polymers 0.000 claims abstract description 110
- 239000011248 coating agent Substances 0.000 claims abstract description 34
- 238000000576 coating method Methods 0.000 claims abstract description 34
- 238000007711 solidification Methods 0.000 claims abstract description 6
- 230000008023 solidification Effects 0.000 claims abstract description 6
- 230000009471 action Effects 0.000 claims abstract description 4
- 238000012797 qualification Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 22
- 238000001125 extrusion Methods 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 8
- 238000002955 isolation Methods 0.000 claims description 7
- 230000005484 gravity Effects 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000006872 improvement Effects 0.000 description 6
- 230000035882 stress Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000003733 fiber-reinforced composite Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004005 microsphere Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a carbon fiber interface strength testing method in the field of carbon fiber detection, which comprises the following working steps: s1, vertically embedding carbon fibers to be detected into resin, and waiting for solidification; s2, after the resin is cured, testing the curing qualification degree by using a clamp, and after the resin is tested to be qualified, performing the next step, and returning the unqualified test to S1; s3, coating a coating on the surface of the carbon fiber exposed outside the resin after curing, and carrying out marking treatment; s4, hooking one end of the carbon fiber by utilizing an external traction structure, and then horizontally moving along the direction deviating from the cured resin; s5, fixing two blades which are symmetrically arranged on one side of the resin after the resin is qualified in curing, and recording traction force F when the carbon fiber is separated from the resin under the traction action in S4; and S6, calculating according to a formula to obtain the interfacial shear strength, and ensuring the accuracy of the carbon fiber interfacial shear strength test data.
Description
Technical Field
The invention relates to a carbon fiber interface strength testing method, in particular to a carbon fiber interface strength testing method applied to the field of carbon fiber detection.
Background
The requirements for fiber reinforced composite materials are increasing at the same time as the requirements for the comprehensive properties of the fiber reinforced composite materials are more stringent due to the rapid development of high technologies such as aerospace and the like. The interface between the fiber and the matrix is one of the key components of the fiber reinforced or toughened composite material, and plays an important role in the micromechanics of the composite material. The interfacial shear strength is the most important mechanical parameter in the interfacial bonding strength, the stress transfer between the fiber and the matrix is carried out through the interface, and the interfacial bonding strength directly influences the stress transfer so as to influence the macroscopic mechanical property of the composite material.
The specification of Chinese patent No. 110967296A discloses a method for testing the interfacial shear strength of a connecting rod composite material, which solves the problem of difficult interfacial shear strength test of the existing composite material, wherein the composite material comprises a resin matrix and carbon fibers, and the method comprises the following steps: s1, preparing a composite material into a sample; s2, connecting the sample with a micro-loading unit, enabling an upper cutter and a lower cutter to be close to the carbon fiber as much as possible but not contact with the carbon fiber, enabling the cutters to be motionless under the micro-loading effect, enabling the carbon fiber to slowly move along the stress direction and contact with the resin ball, enabling the resin ball to be debonded and slide along the carbon fiber under the effect of the cutters along with the gradual increase of the loading value, and recording the maximum debonded force Fmax generated by the resin drop by a sensor; s3, substituting the numerical value measured in the step S2 into the interfacial shear strength IFSS obtained through calculation, d represents the diameter of the carbon fiber monofilament, and l represents the carbon fiber in the resin ball.
However, in the above test method, the curing of the resin cannot be tested in a qualified manner, if the resin is in a state of being cured on the surface but not completely cured inside, when the resin with the carbon fiber embedded therein is pulled to move close to the soft collapsed resin ball and the carbon fiber is separated from the inside of the resin to measure Fmax, the measurement value of Fmax is easy to be inaccurate, the result of the interface shear strength IFSS test is further inaccurate, and the resin lacks a corresponding clamping and restraining mechanism in the moving process, so that the direction of Fmax and the horizontal moving direction of the resin have errors possibly, and the effectiveness of Fmax in the subsequent calculation of the interface shear strength IFSS is further indirectly affected.
Disclosure of Invention
Aiming at the prior art, the invention aims to solve the technical problem of ensuring the accuracy of test data when the section shear strength of the carbon fiber is tested by using a microsphere debonding method.
In order to solve the problems, the invention provides a carbon fiber interface strength testing method, which comprises the following working steps:
s1, vertically embedding carbon fibers to be detected into resin, and waiting for solidification;
s2, after the resin is cured, testing the curing qualification degree by using a clamp, and after the resin is tested to be qualified, performing the next step, and returning the unqualified test to S1;
S3, coating a coating on the surface of the carbon fiber exposed outside the resin after curing, and carrying out marking treatment;
s4, hooking one end of the carbon fiber by utilizing an external traction structure, and then horizontally moving along the direction deviating from the cured resin;
S5, fixing two blades which are symmetrically arranged on one side of the resin after being cured, and recording traction force F when the cured resin embedded with the carbon fibers is close to the blades and the carbon fibers are separated from the resin under the traction action in S4;
S6, calculating to obtain interface shear strength IFSS according to a formula, wherein the IFSS is determined by the following formula:
；
where d is the diameter of the carbon fiber and l is the effective length of the carbon fiber embedded in the resin.
In the carbon fiber interface strength testing method, the clamp and the clamp are used for extruding and detecting the cured resin to ensure the curing completeness of the resin and the accuracy of the interface shear strength testing data between the resin and the carbon fiber.
As a further improvement of the application, the surfaces of the two clamps, which deviate from each other, are connected with movable expansion plates, the surfaces of the two clamps, which deviate from each other, are connected with expansion cylinders, the surfaces of the two clamps, which are close to each other, are respectively provided with symmetrical cylindrical grooves, deformation warning units are respectively arranged in the cylindrical grooves, each deformation warning unit comprises an extrusion spring connected with the inner wall of each cylindrical groove, the end parts of the extrusion springs are connected with pressure sensors, the surfaces of the pressure sensors, which deviate from the extrusion springs, are connected with rubber plugs, fluorescent lamp sheets electrically connected with the pressure sensors are embedded in the rubber plugs, the surfaces of the two clamps, which deviate from each other, are respectively provided with symmetrical electromagnetic ring columns, the tops of the two clamps are respectively provided with a restriction seat, a lock chain, the surfaces of which are sleeved with rubber sleeves, is sleeved in the inside the restriction seats, and the tail ends of the lock chain extend to the upper parts of the electromagnetic ring columns.
As a still further improvement of the application, the length value of the chain is larger than that of the rubber pipe sleeve, the length value of the rubber pipe sleeve is larger than that of the horizontal distance between the two clamps, and the surface of the tail end of the chain is coated with a magnetic attraction coating which is attracted with the electromagnetic loop column.
The gravity value of the chain and the rubber sleeve between the two clamps is larger than the friction effect between the rubber sleeve and the constraint seat, and the magnetic attraction force between the chain and the electromagnetic loop column is larger than the gravity value of the chain and the rubber sleeve between the two clamps.
As a still further improvement of the present application, the sectional height value of the resin in S2 is larger than the vertical distance value between the chain and the bottom of the jig in a straightened state, and the resin in S2 is symmetrically arranged with respect to the jig when clamped inside the jig.
As a further improvement of the application, the distance between the two deformation warning units on the surface of the clamp is not more than one third of the value of the section length of the resin in S2.
As a further improvement of the application, the movable expansion plate comprises a C-shaped bottom plate with the surface coated with a silica gel sleeve, the surfaces of the bottom plates, which are close to each other, are connected with expansion plates with the tail ends fixedly connected with the surfaces of the clamps, and the surfaces of the bottom plates, which are positioned at the top of the inner side part of the clamps, are in fit contact with the bottom of the resin.
As a further improvement of the application, the specific working steps in S3 are as follows:
S31, after the carbon fiber is cured to be qualified, tensioning the two ends of the carbon fiber exposed outside the resin respectively, so that the part of the carbon fiber exposed outside the resin and the part of the carbon fiber embedded in the resin keep the same horizontal line;
S32, carrying out landfill coating operation on the rough part of the carbon fiber exposed on the outer surface of the resin, and forming isolation treatment on the part of the carbon fiber embedded in the resin;
S33, after the coating in S32 is cured, polishing the surface of the carbon fiber in S32, and cutting the cured coating protruding out of the surface of the carbon fiber in S32;
And S34, brushing a release coating with the thickness not exceeding one tenth of the diameter value of the carbon fiber on the surface of the coating, and carrying out the step S4 after the release coating is cured.
In summary, before the carbon fiber is pulled to separate from the inside of the resin, the curing strength of the resin is tested, so that the resin can be prevented from directly performing subsequent traction force testing operation under the condition that the surface curing is completed and the curing of the inner core is not completed, the F test accuracy is prevented from being reduced, meanwhile, the value of the L can be effectively measured by utilizing the isolation mark mode, and the accuracy of the test result is comprehensively ensured.
Drawings
FIG. 1 is a flow chart of the method of embodiments 1 and 2 of the present application;
FIG. 2 is a schematic view of the mounting of the clamp, resin, and blade and resin of embodiments 1 and 2 of the present application;
FIG. 3 is a side view of a modified warning unit of embodiments 1 and 2 of the present application;
FIG. 4 is a state diagram of the natural bending of the chain on the resin surface according to embodiments 1 and 2 of the present application;
FIG. 5 is a view showing the state of the interception constraint on the resin when the chain of the 1 st and 2 nd embodiments of the present application is straightened;
FIG. 6 is a prior art operation diagram of embodiments 1 and 2 of the present application;
FIG. 7 is a view showing an arrangement of a carbon fiber surface marking coating according to embodiment 2 of the present application;
fig. 8 is a schematic diagram showing an increase in drag resistance due to an excessively thick surface coating of the carbon fiber according to embodiment 2 of the present application.
The reference numerals in the figures illustrate:
1. A clamp; 2. moving the expansion plate; 3. an electromagnetic ring column; 4. a rubber tube sleeve; 5. a chain; 6. a deformation warning unit; 61. fluorescent lamp sheets; 62. a rubber plug; 63. a pressure sensor; 64. the spring is pressed.
Detailed Description
2 Embodiments of the present application will be described in detail with reference to the accompanying drawings.
Embodiment 1:
fig. 1-6 show a carbon fiber interface strength testing method, which comprises the following working steps:
s1, vertically embedding carbon fibers to be detected into resin, and waiting for solidification;
S2, after the resin is cured, testing the curing qualification degree by using the clamp 1, and after the resin is tested to be qualified, performing the next step, and returning the failed test to the S1;
S3, coating a coating on the surface of the carbon fiber exposed outside the resin after curing, and carrying out marking treatment;
s4, hooking one end of the carbon fiber by utilizing an external traction structure, and then horizontally moving along the direction deviating from the cured resin;
S5, fixing two blades which are symmetrically arranged on one side of the resin after being cured, and recording traction force F when the cured resin embedded with the carbon fibers is close to the blades and the carbon fibers are separated from the resin under the traction action in S4;
S6, calculating to obtain interface shear strength IFSS according to a formula, wherein the IFSS is determined by the following formula:
；
where d is the diameter of the carbon fiber and l is the effective length of the carbon fiber embedded in the resin.
Specifically, when the cross-section shear strength test of the carbon fiber is tested by using the microsphere debonding method, the curing strength of the resin is tested before the carbon fiber is pulled to be separated from the inside of the resin, so that the subsequent traction force test operation can be avoided when the surface curing of the resin is completed and the inner core curing is not completed, when the curing of the resin is not completed, the force of the carbon fiber in the carbon fiber pulled away from the resin is smaller than the traction force of the resin in the complete curing aging, which easily leads to the error of an F test value, in addition, when the resin is not completely cured, the carbon fiber is extruded by a blade under the traction effect and can deform, and further, the carbon fiber partially exposed is embedded into the inside of the carbon fiber, which leads to the error of a test value (the test is usually carried out according to the part of the carbon fiber surface coated with the resin residue, if the l is to be measured in advance, the effective length of the carbon fiber actually embedded in the resin is not easy to be controlled, and is designed to be measured after the pulling out), and meanwhile, the numerical value of the l can be effectively measured by using the way of the isolation mark;
in addition, by means of the design of the clamp 1, the resin after solidification can be restrained, the moving direction of the resin and the moving direction of the carbon fiber can be located on the same horizontal axis, the problem that an included angle exists between F and the horizontal direction is solved, and the effectiveness of F is guaranteed.
The surface that two anchor clamps 1 deviate from each other is connected with and removes expansion plate 2, and the surface that anchor clamps 1 deviate from each other all is connected with telescopic cylinder, the surface that two anchor clamps 1 deviate from each other all is equipped with symmetrical arrangement's cylindricality groove, and the inside in cylindricality groove all has been arranged and has been deformed warning unit 6, deformation warning unit 6 is including the extrusion spring 64 of being connected with cylindricality inslot wall, the end connection of extrusion spring 64 has pressure sensor 63, the surface that pressure sensor 63 deviates from extrusion spring 64 has rubber cock stem 62, the fluorescent lamp piece 61 with pressure sensor 63 electric connection is inlayed in the inside of rubber cock stem 62, symmetrical arrangement's electromagnetic ring post 3 is all installed to the surface that two anchor clamps 1 deviate from each other, and the restriction seat is all installed at the top of two anchor clamps 1, the inside of restriction seat runs through and installs the chain 5 that the surface cover is equipped with rubber tube sleeve 4, and the tail end of chain 5 extends to electromagnetic ring post 3 top.
The length value of the lock chain 5 is larger than that of the rubber pipe sleeve 4, the length value of the rubber pipe sleeve 4 is larger than that of the horizontal distance between the two clamps 1, and the surface of the tail end of the lock chain 5 is coated with a magnetic coating which is mutually attracted with the electromagnetic loop column 3.
The gravity value of the chain 5 and the rubber sleeve 4 between the two clamps 1 is larger than the friction effect between the rubber sleeve 4 and the restraint seat, and the magnetic attraction force between the chain 5 and the electromagnetic loop column 3 is larger than the gravity value of the chain 5 and the rubber sleeve 4 between the two clamps 1.
The section height value of the resin in S2 is larger than the vertical distance value between the chain 5 and the bottom of the clamp 1 in a straightened state, and the resin in S2 is symmetrically arranged about the clamp 1 when clamped inside the clamp 1.
The distance between the two deformation warning units 6 on the surface of the clamp 1 is not more than one third of the length of the resin section in S2.
The movable expansion plate 2 comprises a C-shaped bottom plate with a silica gel sleeve coated on the surface, the surfaces of the bottom plates close to each other are connected with expansion plates with the tail ends fixedly connected with the surface of the clamp 1, and the surfaces of the bottom plates, which are positioned at the top of the inner side part of the clamp 1, are in fit contact with the bottom of the resin.
Specifically, when the resin curing degree test is performed, the telescopic cylinder is started, so that the two clamps 1 are close to each other, the extrusion effect is further achieved on the resin positioned between the two clamps 1, if the resin is cured qualified, the end part of the resin is extruded on the surface of the clamp 1, the deformation warning unit 6 does not work and the resin is not deformed, the electromagnetic loop column 3 is started, the tail end of the chain 5 is enabled to move downwards, the part of the chain 5 and the rubber sleeve 4 positioned between the two clamps 1 is enabled to be straight, the part of the chain 5 and the rubber sleeve 4 are attached to the surface of the resin, corresponding interception constraint processing is achieved, and the possibility that the resin is collapsed upwards in the extrusion process is avoided;
In the initial state, the chain 5 and the rubber sleeve 4 positioned between the two clamps 1 are in a natural bending state, and are lapped on the surface of the resin to wait for the subsequent straightening interception operation;
if the curing is failed, the resin is deformed and the nearby rubber plugs 62 are extruded, so that the pressure sensor 63 senses the extrusion and then sends a starting signal to the fluorescent lamp sheet 61, and at the moment, the fluorescent lamp sheet 61 emits light to prompt a tester that the resin needs to be remanufactured.
In addition, the design of removing expansion plate 2 can make the bottom of the resin after the solidification and remove expansion plate 2's top surface contact, and then played comprehensive spacing out with the centre gripping of anchor clamps 1 and the interception of chain 5, avoided taking place to splash the accident in the extrusion process, the use of rubber tube cover 4 simultaneously can avoid chain 5 surface to cause and scratch the processing to the resin surface to this reduces the production of crack, avoids the change of resin internal stress, and then ensures the accuracy of F test value.
Embodiment 2:
Fig. 7 shows the specific working steps in S3 as follows:
S31, after the carbon fiber is cured to be qualified, tensioning the two ends of the carbon fiber exposed outside the resin respectively, so that the part of the carbon fiber exposed outside the resin and the part of the carbon fiber embedded in the resin keep the same horizontal line;
S32, carrying out landfill coating operation on the rough part of the carbon fiber exposed on the outer surface of the resin, and forming isolation treatment on the part of the carbon fiber embedded in the resin;
S33, after the coating in S32 is cured, polishing the surface of the carbon fiber in S32, and cutting the cured coating protruding out of the surface of the carbon fiber in S32;
And S34, brushing a release coating with the thickness not exceeding one tenth of the diameter value of the carbon fiber on the surface of the coating, and carrying out the step S4 after the release coating is cured.
Specifically, when the carbon fiber exposed outside the resin is subjected to the coating marking process, although the carbon fiber embedded portion and the exposed portion can be effectively subjected to the isolation process, so that the accuracy of the l value in ifss=f/pi dl is ensured, the thickness of the carbon fiber embedded portion is smaller than the exposed portion due to the coating, and a certain resistance is formed when the carbon fiber is pulled out of the resin in the following process (as shown in fig. 8), so that the embedded isolation marking process in the embodiment is adopted;
Because the surface of the carbon fiber is of a porous design, the holes on the surface of the exposed part of the carbon fiber are recessed to be filled, and polishing and anti-sticking coating treatment are carried out, so that the carbon fiber of the exposed part can play a role in marking, and meanwhile, the interference influence of the increase of the diameter value of the exposed part of the carbon fiber on the subsequent traction effect can be avoided.
The present application is not limited to the above-described embodiments, which are adopted in connection with the actual demands, and various changes made by the person skilled in the art without departing from the spirit of the present application are still within the scope of the present application.
Claims (8)
1. The carbon fiber interface strength testing method is characterized by comprising the following working steps:
s1, vertically embedding carbon fibers to be detected into resin, and waiting for solidification;
s2, after the resin is cured, testing the curing qualification degree by using a clamp (1), and after the resin is tested to be qualified, performing the next step, and returning the unqualified test to the S1;
S3, coating a coating on the surface of the carbon fiber exposed outside the resin after curing, and carrying out marking treatment;
s4, hooking one end of the carbon fiber by utilizing an external traction structure, and then horizontally moving along the direction deviating from the cured resin;
S5, fixing two blades which are symmetrically arranged on one side of the resin after being cured, and recording traction force F when the cured resin embedded with the carbon fibers is close to the blades and the carbon fibers are separated from the resin under the traction action in S4;
S6, calculating to obtain interface shear strength IFSS according to a formula, wherein the IFSS is determined by the following formula:
；
where d is the diameter of the carbon fiber and l is the effective length of the carbon fiber embedded in the resin.
2. The method for testing the interfacial strength of the carbon fiber according to claim 1, wherein the specific working steps in S3 are as follows:
S31, after the carbon fiber is cured to be qualified, tensioning the two ends of the carbon fiber exposed outside the resin respectively, so that the part of the carbon fiber exposed outside the resin and the part of the carbon fiber embedded in the resin keep the same horizontal line;
S32, carrying out landfill coating operation on the rough part of the carbon fiber exposed on the outer surface of the resin, and forming isolation treatment on the part of the carbon fiber embedded in the resin;
S33, after the coating in S32 is cured, polishing the surface of the carbon fiber in S32, and cutting the cured coating protruding out of the surface of the carbon fiber in S32;
And S34, brushing a release coating with the thickness not exceeding one tenth of the diameter value of the carbon fiber on the surface of the coating, and carrying out the step S4 after the release coating is cured.
3. The method for testing the interfacial strength of the carbon fiber according to claim 1, wherein the method comprises the steps of: two the surface connection that anchor clamps (1) deviate from each other has movable expansion plate (2), and the surface that anchor clamps (1) deviate from each other all is connected with flexible cylinder, two the surface that anchor clamps (1) deviate from each other all is equipped with symmetrical arrangement's cylindricality groove, and the inside in cylindricality groove all is arranged and is warned unit (6) of deformation, deformation warning unit (6) including extrusion spring (64) with cylindricality inslot wall connection, the end connection of extrusion spring (64) has pressure sensor (63), the surface connection that pressure sensor (63) deviate from extrusion spring (64) has rubber stopper (62), the internally mounted of rubber stopper (62) have with pressure sensor (63) electric connection's fluorescent lamp piece (61), two the electromagnetism loop post (3) of symmetrical arrangement are all installed on the surface that anchor clamps (1) deviate from each other, and two the top of anchor clamps (1) all installs the restraint seat, the inside of restraint seat is run through and is installed surperficial cover and is equipped with chain (5) of rubber pipe sleeve (4), and tail end (5) extend to electromagnetic loop post (3).
4. A method for testing interfacial strength of carbon fiber according to claim 3, wherein: the length value of the chain (5) is greater than that of the rubber pipe sleeve (4), the length value of the rubber pipe sleeve (4) is greater than that of the horizontal distance between the two clamps (1), and the surface of the tail end of the chain (5) is coated with a magnetic attraction coating which is attracted with the electromagnetic loop column (3).
5. The method for testing the interfacial strength of the carbon fiber according to claim 4, wherein the method comprises the steps of: the gravity value of the chain (5) and the rubber sleeve (4) between the two clamps (1) is greater than the friction effect between the rubber sleeve (4) and the constraint seat, and the magnetic attraction force between the chain (5) and the electromagnetic loop column (3) is greater than the gravity value of the chain (5) and the rubber sleeve (4) between the two clamps (1).
6. The method for testing the interfacial strength of the carbon fiber according to claim 1, wherein the method comprises the steps of: the section height value of the resin in the S2 is larger than the vertical distance value between the chain (5) and the bottom of the clamp (1) in a straightened state, and the resin in the S2 is symmetrically arranged about the clamp (1) when clamped inside the clamp (1).
7. A method for testing interfacial strength of carbon fiber according to claim 3, wherein: the distance value between the two deformation warning units (6) on the surface of the clamp (1) is not more than one third of the resin section length value in the step S2.
8. A method for testing interfacial strength of carbon fiber according to claim 3, wherein: the movable expansion plate (2) comprises a C-shaped bottom plate with a silica gel sleeve coated on the surface, the surfaces of the bottom plates close to each other are connected with expansion plates with the tail ends fixedly connected with the surfaces of the clamps (1), and the surfaces of the bottom plates, which are positioned at the tops of the inner side parts of the clamps (1), are in fit contact with the bottoms of the resins.
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- 2024-04-28 CN CN202410518417.0A patent/CN118090466A/en active Pending
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| CN105928800A (en) * | 2016-04-19 | 2016-09-07 | 同济大学 | Device and method for testing interfacial shear strength of fiber reinforced thermosetting resin composite materials |
| CN109596464A (en) * | 2018-12-27 | 2019-04-09 | 北京航空航天大学 | A kind of interface performance test method of surface modification of carbon nanotube fiber |
| CN110967296A (en) * | 2019-12-24 | 2020-04-07 | 肇庆市海特复合材料技术研究院 | Method for testing interface shear strength of connecting rod composite material |
| KR20230135391A (en) * | 2022-03-16 | 2023-09-25 | 재단법인 한국탄소산업진흥원 | Measurement of bonding strength of between resin and fiber by micro-droplet method |
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