CN219369536U - Double lap joint for evaluating CFRP-steel interface mixed mode bonding performance - Google Patents
Double lap joint for evaluating CFRP-steel interface mixed mode bonding performance Download PDFInfo
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- CN219369536U CN219369536U CN202320556755.4U CN202320556755U CN219369536U CN 219369536 U CN219369536 U CN 219369536U CN 202320556755 U CN202320556755 U CN 202320556755U CN 219369536 U CN219369536 U CN 219369536U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
Abstract
The utility model discloses a double lap joint for evaluating the bonding performance of a CFRP-steel interface mixed mode, which comprises a first CFRP plate, a second CFRP plate, a first steel plate, a second steel plate, a third steel plate, a steel plate for controlling a peeling angle and a structural adhesive, wherein the second steel plate and the third steel plate are respectively fixed on two sides of the steel plate for controlling the peeling angle through high-strength bolts, the same ends of the first CFRP plate and the second CFRP plate are respectively fixed on two sides of the first steel plate through the structural adhesive, the other end of the first CFRP plate is fixed on the outer side of the second steel plate through the structural adhesive, the other end of the second CFRP plate is fixed on the outer side of the third steel plate through the structural adhesive, and strain gauges are distributed on the outer side of the first CFRP plate along the length direction of the first CFRP plate. The utility model solves the defect that the existing double lap joint can only carry out a mode II loading test and can not realize a mode I/II mixed loading test, and the mixed loading mode with the stripping angle can be more consistent with the stress condition of an actual engineering structure, so that the bonding performance of the CFRP-steel interface can be effectively evaluated.
Description
Technical Field
The utility model relates to the technical field of double lap joints, in particular to a double lap joint for evaluating the bonding performance of a CFRP-steel interface mixed mode.
Background
The carbon fiber reinforced composite material (Carbon Fiber Reinforced Polymer, CFRP) is used as a reinforcing material, has the advantages of light weight, high strength, excellent fatigue resistance and durability, and easy construction and maintenance, and is widely applied to the fields of military, automobiles, ocean, civil engineering and the like. The CFRP reinforcement technology is fully developed, compared with the traditional steel structure reinforcement technology, the CFRP does not increase the dead weight and the size of the original structure, does not weaken the original structure or cause stress concentration, and has lower reinforcement cost. However, since the discontinuity of the reinforcing fibers at the bonding interface during reinforcement repair is usually the weakest part of the structure at the lap joint, which directly affects the connection strength and the reinforcement quality, it is highly desirable to evaluate the bonding performance at the bonding interface to ensure the reinforcement effect. However, the existing lap joint can only implement a single loading mode, such as mode I peel type or mode II shear loading, can not perform mixed mode I/II loading and testing (shear and peel coupling loading) on a bonding interface, cannot conform to stress conditions in an actual engineering structure, and cannot effectively evaluate the bonding performance of a CFRP-steel interface.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model aims to provide a double lap joint for evaluating the bonding performance of a CFRP-steel interface mixed mode, which has the advantage of being capable of simultaneously carrying out a mode I/II mixed loading test on the bonding interface, solves the problem that the conventional double lap joint cannot simultaneously realize the short plates of two loading modes (shearing and stripping coupling loading) in one sample, is more consistent with the stress condition in an actual engineering structure, and can be used for more effectively evaluating the bonding performance of the CFRP-steel interface.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the utility model provides an evaluate two overlap joint of CFRP-steel interface mixed mode adhesive property, includes first CFRP board, second CFRP board, first steel sheet, second steel sheet, third steel sheet, peel angle control steel sheet and structural adhesive, second steel sheet and third steel sheet are fixed respectively through high strength bolt in the both sides of peel angle control steel sheet, and the same end of first CFRP board and second CFRP board is fixed respectively through structural adhesive in the both sides of first steel sheet, and the other end of first CFRP board is fixed in the second steel sheet outside through structural adhesive, and the other end of second CFRP board is fixed in the third steel sheet outside through structural adhesive, the outside of first CFRP board is along the length direction equidistance distribution of first CFRP board has the foil gage.
The first CFRP plate is close to the second steel plate and the second CFRP plate is close to the cover plate symmetrically outside one end of the third steel plate, screw holes are formed in the two cover plates, high-strength bolts penetrate through the screw holes, and the screw rod ends of the high-strength bolts sequentially penetrate through the cover plate on the upper side, the cover plate on the second steel plate, the cover plate on the third steel plate and the cover plate on the lower side and are fixed through nuts.
The thickness of the first steel plate is 6-10mm, the thickness of the second steel plate is 3-5mm, and the thickness of the third steel plate is 3-5mm.
The thickness of the adhesive was 1mm, the thickness of the first CFRP plate was 1.2mm, and the width of the first CFRP plate was 15mm.
According to the utility model, the first CFRP plate, the second CFRP plate, the first steel plate, the second steel plate, the third steel plate and the structural adhesive are arranged, the angle between the first CFRP plate and the second CFRP plate is obliquely arranged to form a stripping angle by arranging the stripping control steel plate between the second steel plate and the third steel plate, and the size of the stripping angle of the CFRP can be regulated by regulating the thickness of the stripping control steel plate, so that a coupling loading test experiment of a shearing loading mode and a stripping loading mode can be carried out, the defect that the traditional double-overlap joint can only carry out the shearing loading test and cannot realize the shearing and stripping coupling loading mixed test is overcome, and the loading mode for setting the stripping angle is more matched with the stress condition of an actual engineering structure, and the bonding performance of a CFRP-steel interface can be effectively evaluated.
Drawings
FIG. 1 is a schematic perspective view of the present utility model;
FIG. 2 is a schematic view of a three-dimensional exploded structure of the present utility model;
fig. 3 is an enlarged schematic view of the structure at a in fig. 2.
Detailed Description
The technical solutions in the examples of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the examples of the present utility model.
As shown in fig. 1 to 3, a double lap joint for evaluating the bonding performance of a CFRP-steel interface mixed mode comprises a first CFRP plate 1, a second CFRP plate 2, a first steel plate 3, a second steel plate 4, a third steel plate 5, a steel plate 6 for controlling peeling angle and a structural adhesive 7, wherein the second steel plate 4 and the third steel plate 5 are respectively fixed on both sides of the steel plate 6 for controlling peeling angle through high-strength bolts 11, the same ends of the first CFRP plate 1 and the second CFRP plate 2 are respectively fixed on both sides of the first steel plate 3 through the structural adhesive 7, the other end of the first CFRP plate 1 is fixed on the outer side of the second steel plate 4 through the structural adhesive 7, the other end of the second CFRP plate 2 is fixed on the outer side of the third steel plate 5 through the structural adhesive 7, and the outer side of the first CFRP plate 1 is equidistantly distributed with strain gauges 8 along the length direction of the first CFRP plate.
Cover plates 9 are symmetrically arranged on the outer sides of one ends, close to the third steel plate 5, of the first CFRP plate 1 and the second CFRP plate 2, respectively, screw holes 10 are formed in the two cover plates, high-strength bolts 11 penetrate through the screw holes 10, and the screw ends of the high-strength bolts 11 sequentially penetrate through the cover plates on the upper side, the second steel plate 4, the third steel plate 5 and the cover plates on the lower side and are fixed through nuts. By providing the cover plate 9, the first CFRP plate 1 and the second CFRP plate 2 can be prevented from being separated from the second steel plate 4 and the third steel plate 5 in advance during stretching, and the adhesive property is prevented from being influenced.
The thickness of the first steel plate 3 is 6-10mm, the thickness of the second steel plate 4 is 3-5mm, and the thickness of the third steel plate 5 is 3-5mm.
The thickness of the structural adhesive is 1mm, the thickness of the first CFRP plate 1 is 1.2mm, and the width of the first CFRP plate 1 is 15mm.
The working principle and the using flow of the utility model are as follows: when the CFRP plate is used, the left end parts of the first CFRP plate 1 and the second CFRP plate 2 can be stably adhered to the two sides of the first steel plate 3 through the structural adhesive 7, the second steel plate 4 and the third steel plate 5 are respectively fixed to the two sides of the steel plate 6 for controlling the peeling angle through the high-strength bolts 11, the right end parts of the first CFRP plate 1 and the second CFRP plate 2 are respectively adhered to the outer sides of the second steel plate 4 and the third steel plate 5 through the structural adhesive 7 and are reinforced through the cover plate 9 and the high-strength bolts 11, so that the first CFRP plate 1, the second CFRP plate 2, the second steel plate 4 and the third steel plate 5 are prevented from being debonded in advance to fail during stretching, the data under the two mixed mode loading can be measured through the strain gauge 8, the effect that the mode I/II (shear and peeling coupling loading) mixed loading can be carried out on the joint at the same time is achieved, the defect that the mode I/II mixed loading test (shear coupling loading) can not be realized through the conventional double-lap joint can only be carried out, and the bonding performance of the CFRP-steel interface can be effectively evaluated.
Claims (4)
1. A double lap joint for evaluating CFRP-steel interface mixed mode bonding performance, characterized by: including first CFRP board (1), second CFRP board (2), first steel sheet (3), second steel sheet (4), third steel sheet (5), peel angle control steel sheet (6) and structural adhesive (7), second steel sheet (4) and third steel sheet (5) are fixed in the both sides of peel angle control steel sheet (6) through high strength bolt (11) respectively, the same end of first CFRP board (1) and second CFRP board (2) is fixed in the both sides of first steel sheet (3) through structural adhesive (7) respectively, the other end of first CFRP board (1) is fixed in second steel sheet (4) outside through structural adhesive (7), the other end of second CFRP board (2) is fixed in third steel sheet (5) outside through structural adhesive (7), the outside of first CFRP board (1) is along the length direction equidistance distribution of first CFRP board has foil gage (8).
2. A double lap joint for evaluating CFRP-steel interface mixed mode bonding performance in accordance with claim 1, wherein: the first CFRP plate (1) is close to one end outside symmetry that second steel sheet (4) and second CFRP plate (2) are close to third steel sheet (5) and is equipped with apron (9), all is equipped with screw (10) on two apron, wears to be equipped with high strength bolt (11) in the screw, and the screw rod end of high strength bolt (11) is in proper order run through apron (9) of upside, second steel sheet (4), third steel sheet (5) and downside and are fixed with the nut.
3. The double lap joint for evaluating CFRP-steel interface mixed mode adhesive performance of claim 1 wherein: the thickness of the first steel plate (3) is 6-10mm, the thickness of the second steel plate (4) is 3-5mm, and the thickness of the third steel plate (5) is 3-5mm.
4. The double lap joint for evaluating CFRP-steel interface mixed mode adhesive performance of claim 1 wherein: the thickness of the structural adhesive (7) is 1mm, the thickness of the first CFRP plate (1) is 1.2mm, and the width of the first CFRP plate (1) is 15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320556755.4U CN219369536U (en) | 2023-03-20 | 2023-03-20 | Double lap joint for evaluating CFRP-steel interface mixed mode bonding performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320556755.4U CN219369536U (en) | 2023-03-20 | 2023-03-20 | Double lap joint for evaluating CFRP-steel interface mixed mode bonding performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219369536U true CN219369536U (en) | 2023-07-18 |
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ID=87138576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320556755.4U Active CN219369536U (en) | 2023-03-20 | 2023-03-20 | Double lap joint for evaluating CFRP-steel interface mixed mode bonding performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219369536U (en) |
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2023
- 2023-03-20 CN CN202320556755.4U patent/CN219369536U/en active Active
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