CN210953671U

CN210953671U - Shear test device for testing CFRP/steel interface bonding performance

Info

Publication number: CN210953671U
Application number: CN201921851693.XU
Authority: CN
Inventors: 徐善华; 王友德; 李晗; 宋翠梅; 夏敏
Original assignee: Xian University of Architecture and Technology
Current assignee: Xian University of Architecture and Technology
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-07-07
Anticipated expiration: 2029-10-30

Abstract

The utility model discloses a shear test device for testing CFRP steel interface adhesion performance, include: the device comprises a base, a test piece base, a position calibration plate, a tension sensor, a sliding block, a track and a loading device; the test piece base is mounted on the base in a height-adjustable manner and is used for fixedly mounting a steel plate in the CFRP/steel combined test piece; a track is arranged on the base, and a sliding block is arranged on the track; one end of the tension sensor is connected with the sliding block, and the other end of the tension sensor is used for connecting a CFRP plate in the CFRP/steel combined test piece; the position calibration plate is fixedly arranged on the base; the position calibration plate is provided with a through hole for penetrating through a CFRP plate in the CFRP/steel combined test piece; the loading device is arranged on the base and is used for enabling the sliding block to move on the track. The utility model discloses can solve the problem of the easy skew loading axis of CFRP steel combination test piece in the test process, can make the test piece only receive the shear load effect, improve experimental accuracy nature.

Description

Shear test device for testing CFRP/steel interface bonding performance

Technical Field

The utility model belongs to the technical field of carbon-fibre composite consolidates the steel construction, in particular to a shear test device for testing CFRP steel interface bonding performance.

Background

Carbon fiber reinforced Composites (CFRP), as a new material, have high strength, light weight, fatigue resistance, corrosion resistance, etc., and have been widely used to reinforce steel structures. By attaching the CFRP outside the surface of the steel, the bearing performance and the durability of the steel can be effectively improved. Research shows that the interface of the CFRP externally attached reinforced steel member is mainly influenced by shear stress, and the main failure mode is that the CFRP material is debonded from the steel surface, which indicates that the weak area is the CFRP/steel interface.

According to the stress characteristics of the CFRP reinforced steel member, the interface is mainly influenced by the shear stress. Therefore, in the research of the CFRP/steel interface shearing resistance, how to make the test piece receive the ideal shearing load is very important. At present, scholars at home and abroad mainly adopt a tensile testing machine or a fatigue testing machine for testing, and the centering degree of a fixing clamp of the scholars at home and abroad cannot meet the requirement.

In summary, a new CFRP/steel interface shear test device is needed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a shear test device for testing CFRP steel interface adhesion performance to solve the above-mentioned one or more technical problem who exists. The utility model discloses can solve the problem of the easy skew loading axis of CFRP steel combination test piece in the test process, can make the test piece only receive the shear load effect, improve experimental accuracy nature.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model discloses a shear test device for testing CFRP steel interface adhesion performance, include: the device comprises a base, a test piece base, a position calibration plate, a tension sensor, a sliding block, a track and a loading device; the test piece base is mounted on the base in a height-adjustable manner and is used for fixedly mounting a steel plate in the CFRP/steel combined test piece; a track is arranged on the base, and a sliding block is arranged on the track; one end of the tension sensor is connected with the sliding block, and the other end of the tension sensor is used for connecting a CFRP plate in the CFRP/steel combined test piece; the position calibration plate is fixedly arranged on the base; the position calibration plate is provided with a rectangular through hole for penetrating through a CFRP plate in the CFRP/steel combined test piece; the loading device is arranged on the base and is used for enabling the sliding block to move on the track; the moving direction of the sliding block is parallel to the length direction of the CFRP plate in the CFRP/steel combined test piece.

The utility model discloses a further improvement lies in, still includes: a splint; one end of the clamping plate is connected with the free end of the tension sensor, and the other end of the clamping plate is used for being connected with a CFRP (carbon fiber reinforced plastics) plate in the CFRP/steel combined test piece.

The utility model is further improved in that the loading device is a hydraulic jack; the fixed end of the hydraulic jack is installed on the base, and the driving end of the hydraulic jack is fixedly connected with the sliding block.

The utility model discloses a further improvement lies in, still includes: CFRP/steel combination test piece;

the CFRP/steel combined test piece comprises: steel plates and CFRP plates;

the CFRP plate is bonded on the steel plate through an epoxy bonding layer;

the width of the steel plate is larger than that of the CFRP plate;

a plurality of connecting holes are respectively formed in the two long side sides of the steel plate along the length direction of the steel plate;

a steel plate in the CFRP/steel combined test piece is fixed on the test piece base through a connecting hole and a fastening bolt; and a CFRP plate in the CFRP/steel combined test piece passes through a through hole arranged on the position calibration plate and is connected with the tension sensor.

The utility model discloses a further improvement lies in, the test piece base passes through adjusting bolt installation on the base, adjusting bolt is used for adjusting the mounting height of test piece base.

The utility model discloses a further improvement lies in, the test piece base includes: mounting a platform and a level gauge; the mounting platform is provided with a groove, the groove is provided with a plurality of mounting holes, and the groove is used for mounting a steel plate of the CFRP/steel combined test piece; the mounting platform is provided with a plug, the base is provided with a jack, and the plug is used for being inserted into the jack of the base; the mounting platform is provided with a level gauge.

The utility model is further improved in that the through hole is arranged at the geometric center of the position calibration plate; the center line of the through hole is coincident with the loading axis of the loading device; the width and the height of the rectangular through hole are respectively 1mm larger than the width and the thickness of the CFRP plate.

Compared with the prior art, the utility model discloses following beneficial effect has:

in the shearing device of the utility model, the test piece base and the tension sensor are respectively used for connecting the steel plate and the CFRP plate of the test piece; providing a test load through a loading device, and measuring a load value in the loading process by a tension sensor; the sliding block is constrained by the track and can only move horizontally along the length direction of the CFRP plate under the pushing of the loading device; by adjusting the test piece base, the CFRP plate passes through the through hole on the position calibration plate, so that the CFRP/steel combined test piece is ensured to be superposed with the loading axis in the whole loading process, the test piece is prevented from bending out of plane, and the test piece is always under the shearing load; the utility model discloses the simple structure of device, the dependable performance works as CFRP steel combination test piece is fixed and is adjusted the position when on the test piece base, the CFRP board passes the clearing hole and with tension sensor is located the loading axis jointly, can guarantee loading effect and accuracy nature and raise the efficiency.

Furthermore, in the loading process, out-of-plane bending of the test piece can occur at present, so that the test piece deviates from the loading axis to influence the loading effect; the utility model discloses respectively open a row of holes and use fastening bolt to fix it on the test piece base in the position that is close to the long limit of steel sheet, and connect the CFRP board through splint, can prevent that CFRP steel combination test piece from taking place the plane bending outward at the loading in-process.

Further, a rectangular through hole is provided at the geometric center of the position calibration plate, the center line of the through hole coincides with the loading axis of the loading device, and the width and height of the through hole are respectively 1mm larger than the width and thickness of the CFRP plate. When the CFRP/steel combination test piece is fixed on the test piece base with the adjusted position, the CFRP plate passes through the through hole and is positioned on the loading axis together with the tension sensor.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic structural diagram of a shear test apparatus for testing CFRP/steel interface adhesion performance according to an embodiment of the present invention;

fig. 2 is a schematic longitudinal sectional view of a shear test apparatus for testing the adhesion performance of a CFRP/steel interface according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a CFRP/steel interface combination test piece according to an embodiment of the present invention; wherein, fig. 3 (a) is a front view structure diagram, and fig. 3 (b) is a top view structure diagram;

FIG. 4 is a schematic structural diagram of a test piece base in an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a position calibration plate according to an embodiment of the present invention;

in fig. 1 to 5, 1, a base; 2. a test piece base; 3. adjusting the bolt; 4. CFRP/steel combination test piece; 5. fastening a bolt; 6. a position calibration plate; 7. clamping the bolt; 8. a splint; 9. a pin; 10. a tension sensor; 11. a slider; 12. a track; 13. a hydraulic jack; 14. a CFRP board; 15. an epoxy adhesive layer; 16. a steel plate; 17. a level gauge; 18. mounting a platform; 19. a plug; 20. through the aperture.

Detailed Description

In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following description, with reference to the drawings in the embodiments of the present invention, clearly and completely describes the technical solution in the embodiments of the present invention; obviously, the described embodiments are some of the embodiments of the present invention. Based on the embodiments disclosed in the present invention, other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to fig. 1 and fig. 2, a shear test apparatus for testing CFRP/steel interface adhesion performance according to an embodiment of the present invention includes: the device comprises a base 1, a test piece base 2, an adjusting bolt 3, a CFRP/steel combined test piece 4, a fastening bolt 5, a position calibration plate 6, a clamping bolt 7, a clamping plate 8, a pin 9, a tension sensor 10, a sliding block 11, a rail 12 and a hydraulic jack 13.

Referring to fig. 3, the CFRP/steel combination test piece 4 is a single-side lap joint test piece of a CFRP plate 14, an epoxy resin adhesive layer 15, and a steel plate 16; wherein the width of the steel plate 16 is greater than the width of the CFRP plate 14. In order to prevent the CFRP/steel combined test piece from bending out of plane in the loading process, a row of holes are respectively formed at the positions close to the long edges of the steel plates and are fixed in the grooves of the test piece base 2 by fastening bolts 5.

Referring to fig. 4, the specimen base 2 is composed of a level gauge 17, a mounting platform 18 with a groove and four plugs 19, the steel plate 16 of the CFRP/steel combined specimen 4 is fixed in the groove, and the plugs 19 are inserted into the insertion holes on the base 1 and fixed by the adjusting bolts 3. Wherein, the height of the test piece base 2 is controlled and adjusted by the adjusting bolt 3.

Preferably, the test piece base 2 is inserted on the base 1, the installation height is adjusted through the adjusting bolt 3, the steel plate 16 of the CFRP/steel combined test piece 4 is fixed in the groove of the test piece base 2 through the fastening bolt 5, the CFRP plate 14 passes through the through hole 20 of the position calibration plate 6 and then is clamped by the clamping bolt 7 and the clamping plate 8 and is connected with the tension sensor 10 and the slide block 11 through the pin 9, and the slide block 11 is restrained by the rail 12 and translates along the length direction of the CFRP plate under the action of the hydraulic jack 13.

Referring to fig. 5, the position calibration plate 6 has a through hole 20 with a size slightly larger than the cross section of the CFRP plate, and only allows the CFRP plate to vertically pass through.

The loading process of the test device is as follows: the hydraulic jack pushes the sliding block to slide along the track, and the sliding block pulls the tension sensor and the CFRP plate to apply shearing load to the CFRP/steel combined test piece. And the load value in the loading process is obtained by the tension sensor.

The utility model provides a loading test device for testing the interface shear resistance of a CFRP/steel combined test piece specially, which can ensure the coincidence of the CFRP/steel combined test piece and a loading axis in the whole loading process, prevent the test piece from bending out of plane and enable the test piece to be always under the shear load; the device has simple structure and reliable performance, and can ensure the loading effect and improve the efficiency.

The utility model discloses a CFRP steel interface shear test device's use specifically includes following step:

(1) the CFRP plate 14 on the CFRP/steel combination test piece 4 is passed through the through hole 20 on the position calibration plate 6.

(2) The CFRP plate 14 is connected with the tension sensor 10 and the slider 11 by the clamp bolt 7, the clamp plate 8, and the pin 9. Wherein, the slide block 11 is restrained by the rail 12 and can only translate along the length direction of the CFRP plate 14 under the pushing of the hydraulic jack 13.

(3) Screwing the adjusting bolt 3 to enable the height of the test piece base 2 to be the same as that of the steel plate 16 and fixing the test piece base by the fastening bolt 5; the test piece base is leveled by means of the adjusting screw 3 and the level 17, so that the CFRP plate 14, the passage opening 20, the tension sensor 10 and the slide 11 are aligned on one axis.

(4) The hydraulic jack 13 is pressed to push the slide block 11 to slide along the track 12, and the slide block 11 pulls the tension sensor 10 and the CFRP plate 14 to apply a shearing load to the CFRP/steel combination test piece 4. The load value in the loading process is acquired by the tension sensor 10.

To sum up, the utility model provides a can accurate control loading axis and effectively prevent crooked CFRP steel interface shear test device and method outside the plane. The utility model discloses a shear test device, mainly include base, test piece base, adjusting bolt, CFRP/steel combination test piece, fastening bolt, position calibration board, clamping bolt, splint, pin, force transducer, slider, track and hydraulic jack; the CFRP/steel combined test piece is fixed on the test piece base through a fastening bolt, passes through the position calibration plate and is connected with the tension sensor and the sliding block through a clamping bolt, a clamping plate and a pin, the sliding block is restrained by the rail, and only translates along the length direction of the CFRP plate under the action of the hydraulic jack. The utility model discloses the structure is reliable, easy operation, can accurate control loading axis and prevent the out-of-plane bending of test piece, makes the test piece receive shear load all the time, guarantees loading effect and raises the efficiency. The loading axis of the test device is adjusted by the test piece base, the adjusting bolt and the position calibration plate, and the method specifically comprises the following steps: firstly, a CFRP plate of a CFRP/steel combined test piece penetrates through a through hole in a position calibration plate and is connected with a tension sensor and a sliding block; then screwing an adjusting bolt to ensure that the height of the test piece base is the same as that of the CFRP/steel combined test piece and the test piece base is fixed by a fastening bolt; and finally, leveling the test piece base by using an adjusting bolt and a level gauge, so that the CFRP plate, the through hole, the tension sensor and the sliding block are adjusted to be on the same axis.

The above embodiments are only used to illustrate the technical solution of the present invention and not to limit the same, although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify or equally replace the specific embodiments of the present invention, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention is within the protection scope of the claims of the present invention.

Claims

1. A shear test device for testing the bonding performance of a CFRP/steel interface, comprising: the device comprises a base (1), a test piece base (2), a position calibration plate (6), a tension sensor (10), a sliding block (11), a track (12) and a loading device;

the test piece base (2) is mounted on the base (1) in a height-adjustable manner, and the test piece base (2) is used for fixedly mounting a steel plate (16) in the CFRP/steel combined test piece (4);

a track (12) is arranged on the base (1), and a sliding block (11) is arranged on the track (12); one end of the tension sensor (10) is connected with the sliding block (11), and the other end of the tension sensor (10) is used for connecting a CFRP plate (14) in the CFRP/steel combined test piece (4);

the position calibration plate (6) is fixedly arranged on the base (1); the position calibration plate (6) is provided with a rectangular through hole (20), and the through hole (20) is used for penetrating through a CFRP plate (14) in the CFRP/steel combined test piece (4);

the loading device is arranged on the base (1) and is used for enabling the sliding block (11) to move on the track (12); the moving direction of the sliding block (11) is parallel to the length direction of a CFRP plate (14) in the CFRP/steel combined test piece (4).

2. The shear test device for testing the bonding performance of the CFRP/steel interface of claim 1, which is characterized by further comprising: a splint (8);

one end of the clamping plate (8) is connected with the free end of the tension sensor (10), and the other end of the clamping plate (8) is used for being connected with a CFRP plate (14) in the CFRP/steel combined test piece (4).

3. A shear test device for testing the adhesion properties of a CFRP/steel interface according to claim 1, characterized in that the loading device is a hydraulic jack (13);

the fixed end of the hydraulic jack (13) is installed on the base (1), and the driving end of the hydraulic jack (13) is fixedly connected with the sliding block (11).

4. The shear test device for testing the bonding performance of the CFRP/steel interface of claim 1, which is characterized by further comprising: a CFRP/steel combined test piece (4);

the CFRP/steel combination test piece (4) comprises: a steel plate (16) and a CFRP plate (14);

the CFRP plate (14) is bonded on the steel plate (16) through an epoxy resin bonding layer (15);

the width of the steel plate (16) is larger than that of the CFRP plate (14);

a plurality of connecting holes are respectively formed in the two long edge sides of the steel plate (16) along the length direction of the steel plate (16);

a steel plate (16) in the CFRP/steel combined test piece (4) is fixed on the test piece base (2) through a connecting hole and a fastening bolt (5); the CFRP plate (14) in the CFRP/steel combination test piece (4) passes through a through hole (20) arranged on the position calibration plate (6) to be connected with the tension sensor (10).

5. The shear test device for testing the bonding performance of the CFRP/steel interface of claim 1, wherein the test piece base (2) is mounted on the base (1) through an adjusting bolt (3), and the adjusting bolt (3) is used for adjusting the mounting height of the test piece base (2).

6. A shear test device for testing CFRP/steel interfacial adhesion according to claim 1, characterized in that the specimen mount (2) comprises: a mounting platform (18) and a level (17);

the mounting platform (18) is provided with a groove, the groove is provided with a plurality of mounting holes, and the groove is used for mounting a steel plate (16) of the CFRP/steel combined test piece (4);

the mounting platform (18) is provided with a plug (19), the base (1) is provided with a jack, and the plug (19) is used for being inserted into the jack of the base (1);

the mounting platform (18) is provided with a level gauge (17).

7. A shear test device for testing the adhesion properties of a CFRP/steel interface according to claim 1, characterized in that the through hole (20) is provided at the geometric center of the position calibration plate (6); the centre line of the passage hole (20) coincides with the loading axis of the loading device;

the width and the height of the rectangular through hole are respectively 1mm larger than the width and the thickness of the CFRP plate (14).