Device for testing bonding performance of fiber composite and steel interface

Abstract

The utility model provides a fiber composite material and steel interface bonding performance testing device which comprises a force holding plate and a positioning plate, a first clamping groove and a second clamping groove are formed in the force holding plate, the second clamping groove is formed in the bottom face of the first clamping groove, the width of the first clamping groove is larger than that of the second clamping groove, and a steel plate is embedded in the first clamping groove. The fiber composite material is adhered to one surface of the steel plate and is embedded into the second clamping groove; the second clamping groove penetrates through the upper end of the force holding plate; the positioning plate is detachably installed on the force holding plate, and the steel plate is fixed between the positioning plate and the first clamping groove. According to the utility model, the steel plate is fixed and the tension displacement of the steel plate is counteracted through the first clamping groove and the positioning plate on the force holding plate, the fiber composite material is embedded into the second clamping groove and extends out of the upper end of the force holding plate, and the universal testing machine is clamped at the upper end of the fiber composite material and is loaded, so that the research on the bonding performance of the fiber composite material and the steel plate can be realized. The device is simple in structure, easy to assemble, capable of avoiding assembly errors and widely applicable to universal testing machines commonly used in laboratories.

Description

Technical Field

[0001] The utility model relates to the technical field of steel plate repair detection equipment, in particular to a fiber composite material and steel interface bonding performance testing device. Background Art

[0002] The use of bonded fiber composite materials (FRP) to reinforce steel plates can achieve rapid, efficient and non-destructive repair and upgrading of steel components. At the same time, fiber composites have significant advantages such as light weight, high strength, corrosion resistance and convenient processing.

[0003] The fiber composite is bonded to the damaged steel plate surface by structural adhesive, and the fiber composite / steel interface is the main force transmission path of the reinforced component. A large number of tests have shown that the peeling of the fiber composite / steel interface is still the main cause of the damage of the fiber composite reinforced steel plate, so it is necessary to accurately test the bonding performance of the interface.

[0004] At present, the double-lap shear test is a commonly used test method in China and abroad because the double-lap shear test has low requirements for the test device. However, the manufacturing process of its components is complicated, and fiber composites need to be pasted on both sides. Since the fiber composites on both sides cannot be pasted at the same time, it is easy to cause differences in the performance of the adhesive layers on both sides, causing uneven force and measurement errors.

[0005] Relatively speaking, the tensile shear test of single-lap joints is more time-efficient and accurate. However, the clamping devices of single-lap joints are currently more complicated and the assembly is more cumbersome, so they cannot be directly applied to the universal testing machine available in the laboratory.

[0006] Prior art, such as Chinese patent CN108007768A published on May 8, 2018, discloses an axial tensile test device and test method for a fiber mesh or a cloth sheet, which measures the tensile properties by clamping the fiber mesh or the cloth sheet, but cannot measure the interfacial bonding properties between the fiber composite and the steel. Utility Model Content

[0007] The utility model aims to provide a fiber composite material and steel interface bonding performance testing device, which can be based on a single-layer overlap node test piece form and is suitable for a holding device of a universal testing machine.

[0008] The utility model provides a fiber composite and steel interface bonding performance testing device, comprising a force holding plate and a positioning plate, wherein the force holding plate is provided with a first card slot and a second card slot, wherein the second card slot is provided at the bottom surface of the first card slot, the width of the first card slot is greater than the width of the second card slot, a steel plate is embedded in the first card slot, a fiber composite is bonded to one side of the steel plate and embedded in the second card slot; the second card slot runs through the upper end of the force holding plate; the positioning plate is detachably mounted on the force holding plate, and the steel plate is fixed between the positioning plate and the first card slot.

[0009] Furthermore, the upper end of the force-bearing plate is fixedly connected to a force-bearing platform, the second slot passes through the force-bearing platform, and the upper end of the first slot is closed by the force-bearing platform.

[0010] Furthermore, when the steel plate moves upward, the top end contacts the load-bearing platform.

[0011] Furthermore, the top end of the fiber composite material extends out of the load-bearing platform.

[0012] Furthermore, the force-bearing plate is clamped on the lower chuck of the universal testing machine, and the top end of the fiber composite material is clamped on the upper chuck of the universal testing machine.

[0013] Furthermore, the load-bearing platform extends out of the top end of the load-bearing plate, and a rib is provided between the top end of the load-bearing plate and the load-bearing platform.

[0014] Furthermore, the bottom of the second slot passes through the holding plate

[0015] Furthermore, a fixing groove is provided on one side of the positioning plate adjacent to the force holding plate, and the position and width of the fixing groove correspond to the position and width of the first clamping groove.

[0016] Furthermore, one end surface of the steel plate protrudes from the first slot, and the depth of the fixing slot is not greater than the thickness of the steel plate protruding from the first slot.

[0017] Furthermore, screw holes are provided on both sides of the first slot on the force holding plate, screw holes are provided on both sides of the positioning plate, and the positioning plate and the screw holes of the force holding plate are connected by bolts.

[0018] The technical solution of the utility model uses the first slot and the positioning plate on the holding plate to fix the steel plate and offset the tensile displacement of the steel plate, and the fiber composite material bonded to the steel plate is embedded in the second slot and extends out of the upper end of the holding plate, and is clamped on the upper end of the fiber composite material and loaded by the universal testing machine, so as to realize the study of the bonding performance between the fiber composite material and the steel plate. The device has a simple structure and is easy to assemble, which can avoid assembly errors and is widely applicable to universal testing machines commonly used in laboratories. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the rear structure of the utility model;

[0022] Figure 3 It is a schematic diagram of the explosion structure of the utility model;

[0023] Figure 4 It is a side view of the utility model;

[0024] Figure 5 For this utility model Figure 4 AA section view;

[0025] Description of reference numerals:

[0026] 1- bearing plate; 2- positioning plate; 3- first slot; 4- second slot; 5- steel plate; 6- fiber composite material; 7- bearing platform; 8- fixing slot; 9- screw hole; 10- bolt; DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] Example 1

[0031] like Figure 1-Figure 5 As shown, the utility model provides a fiber composite and steel interface bonding performance testing device, including a holding plate 1 and a positioning plate 2, the holding plate 1 is provided with a first card slot 3 and a second card slot 4, the second card slot 4 is provided at the bottom surface of the first card slot 3, the width of the first card slot 3 is greater than the width of the second card slot 4, the steel plate 5 is embedded in the first card slot 3, the fiber composite 6 is bonded to one side of the steel plate 5 and embedded in the second card slot 4; the second card slot 4 runs through the upper end of the holding plate 1; the positioning plate 2 is detachably mounted on the holding plate 1, and the steel plate 5 is fixed between the positioning plate 2 and the first card slot 3.

[0032] Specifically, the device consists of two parts: a holding plate 1 and a positioning plate 2:

[0033] The force-bearing plate 1 is a thicker steel plate, and its thickness is large to offset the possible eccentric deformation during the test; the interior of the force-bearing plate 1 is processed into a hollow structure by the first slot 3 and the second slot 4, the first slot 3 and the second slot 4 are stepped slots, and the slot opening of the second slot 4 is opened at the bottom of the first slot 3, the slot opening of the first slot 3 is wider than the steel plate 5 to facilitate the embedding of the steel plate 5, and the slot opening of the second slot 4 is narrower than the steel plate 5 to support the steel plate 5.

[0034] The positioning plate 2 is a thin steel plate. The positioning plate 2 is close to the steel plate 5 and fixed to the holding plate 1 with bolts 10 to suppress the deflection of the steel plate 5 in the initial stage of the test and prevent torsional deviation. The steel plate 5 is embedded in the first slot 3 of the holding plate 1 and the fixing slot 8 of the positioning plate 2 for positioning before loading and fixing during loading. The center line of the holding plate 1 and the center line of the fiber composite 6 are on the same horizontal plane to prevent measurement errors caused by bending under eccentric loads.

[0035] The steel plate 5 with the fiber composite material 6 is embedded in the holding plate 1, and the steel plate 5 is fixed and provided with a limiting force through the first slot 3 in the holding plate 1. Then, the positioning plate 2 and the holding plate 1 are detachably connected by bolts 10 or snaps, and the bonding performance of the interface is tested by applying a tensile force at the free end of the fiber composite material 6.

[0036] In the prior art, fiber composite / steel bonding performance test devices based on single-layer lap joints are generally fixed with a support device by screws, which makes the assembly of the support device more complicated; at the same time, the tension balanced by bolts is prone to assembly errors, which in turn leads to torsional offset of the node. At the same time, the existing device bolts the steel plate 5 and assumes that the steel plate 5 has no axial deformation, but in fact, the steel plate 5 inevitably has axial deformation during the test. This device abandons the use of bolts to balance the tension, and instead offsets the tensile displacement of the steel plate 5 through the force-bearing platform of the force-bearing plate 1, and ensures that the lap-jointed steel plate 5 can be deformed freely during the force-bearing process, and then the deformation of the steel plate 5 can be determined by the theoretical equation, and then the bonding-slip relationship of the interface can be derived, which makes it easy to estimate the axial deformation of the steel plate 5.

[0037] Example 2

[0038] like Figure 1-Figure 5 As shown, the upper end of the bearing plate 1 is fixedly connected with the bearing platform 7, the second slot 4 penetrates the bearing platform 7, and the upper end of the first slot 3 is closed by the bearing platform 7. When the steel plate 5 moves upward, the top end abuts against the bearing platform 7. The top end of the fiber composite material 6 extends out of the bearing platform 7. The bearing plate 1 is clamped in the lower chuck of the universal testing machine, and the top end of the fiber composite material 6 is clamped in the upper chuck of the universal testing machine. The bearing platform 7 extends out of the top end of the bearing plate 1, and a rib is provided between the top end of the bearing plate 1 and the bearing platform 7.

[0039] Specifically, the upper end of the bearing plate 1 offsets the tension applied to the fiber composite material 6 through the bearing platform 7 .

[0040] The load-bearing platform 7 is fixedly connected to the upper end of the bearing plate 1, blocking the first slot 3 but not the second slot 4, so that the upper end of the fiber composite 6 is extended as a free end to be connected to the universal testing machine. When the universal testing machine is loaded, the fiber composite 6 lifts the steel plate 5 upward through the bonding interface, and the steel plate 5 is abutted by the load-bearing platform 7, so that the bonding performance of the interface can be tested.

[0041] The load-bearing platform 7 extends outward and is connected to the top of the bearing plate 1 through ribs to enhance the load-bearing performance.

[0042] Example 3

[0043] like Figure 1-Figure 5 As shown, the bottom of the second slot 4 passes through the force-holding plate 1 .

[0044] Specifically, the first clamping groove 3 and the second clamping groove 4 integrally form a stepped groove penetrating the force-bearing plate 1 , so as to facilitate the placement of the bonding member between the fiber composite material 6 and the steel plate 5 .

[0045] Example 4

[0046] like Figure 1-Figure 5 As shown, a fixing groove 8 is provided on one side of the positioning plate 2 adjacent to the force holding plate 1, and the position and width of the fixing groove 8 correspond to the position and width of the first clamping groove 3. One end surface of the steel plate 5 protrudes from the first clamping groove 3, and the depth of the fixing groove 8 is not greater than the thickness of the steel plate 5 protruding from the first clamping groove 3.

[0047] Specifically, the width of the fixing groove 8 is slightly larger than the width of the steel plate 5 to facilitate the positioning of the steel plate 5; the depth / thickness of the fixing groove 8 is slightly smaller than the protruding thickness of the steel plate 5 to ensure that the steel plate 5 is firmly assembled. The fixing groove 8 and the first clamping groove 3 cooperate to form a hole for fixing the steel plate 5.

[0048] Example 5

[0049] like Figure 1-Figure 5 As shown, screw holes 9 are provided on both sides of the first slot 3 on the force holding plate 1 , screw holes 9 are provided on both sides of the positioning plate 2 , and the positioning plate 2 and the screw holes 9 of the force holding plate 1 are connected by bolts 10 .

[0050] Specifically, there are multiple screw holes 9 that are evenly arranged along the length direction of the positioning plate 2 , and the positioning plate 2 is pressed onto the holding plate 1 by inserting bolts 10 into the screw holes 9 of the positioning plate 2 and the holding plate 1 .

[0051] Working mode of the utility model:

[0052] Take the fiber composite material 6 and the steel plate 5 bonded together:

[0053] Step 1: Use the lower chuck of the universal testing machine to hold the force plate 1.

[0054] Step 2: Place the steel plate 5 of the lap joint into the holding plate 1 , with the steel plate 5 close to the first slot 3 .

[0055] Step three, cover the positioning plate 2 on the holding plate 1 and tighten it with bolts 10.

[0056] Step 4: The fiber composite material 6 plate is clamped on the upper end of the universal testing machine.

[0057] Step 5: The universal testing machine starts loading and measures the surface strain of the fiber composite material 6 .

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. Fiber composite and steel interface bonding performance testing device, characterized in that: It comprises a force holding plate and a positioning plate, wherein the force holding plate is provided with a first slot and a second slot, wherein the second slot is provided at the bottom surface of the first slot, and the width of the first slot is greater than the width of the second slot, wherein the steel plate is embedded in the first slot, and the fiber composite material is bonded to one side of the steel plate and embedded in the second slot; The second slot passes through the upper end of the force-holding plate; The positioning plate is detachably mounted on the force holding plate, and the steel plate is fixed between the positioning plate and the first slot.

2. The fiber composite and steel interface bonding performance testing device according to claim 1, characterized in that: The upper end of the force-bearing plate is fixedly connected to a force-bearing platform, the second slot passes through the force-bearing platform, and the upper end of the first slot is closed by the force-bearing platform.

3. The fiber composite and steel interface bonding performance testing device according to claim 2, characterized in that: When the steel plate moves upward, the top end contacts the load-bearing platform.

4. The fiber composite and steel interface bonding performance testing device according to claim 3, characterized in that: The top end of the fiber composite material extends out of the load-bearing platform.

5. The fiber composite and steel interface bonding performance testing device according to claim 4, characterized in that: The force holding plate is clamped on the lower clamp of the universal testing machine, and the top end of the fiber composite material is clamped on the upper clamp of the universal testing machine.

6. The fiber composite and steel interface bonding performance testing device according to claim 2, characterized in that: The load-bearing platform extends out of the top end of the load-bearing plate, and a rib is provided between the top end of the load-bearing plate and the load-bearing platform.

7. The fiber composite and steel interface bonding performance testing device according to claim 1, characterized in that: The bottom of the second slot passes through the force-holding plate.

8. The fiber composite and steel interface bonding performance testing device according to claim 1, characterized in that: A fixing groove is formed on one side of the positioning plate adjacent to the force holding plate, and the position and width of the fixing groove correspond to the position and width of the first clamping groove.

9. The fiber composite and steel interface bonding performance testing device according to claim 8, characterized in that: One end surface of the steel plate protrudes from the first clamping groove, and the depth of the fixing groove is not greater than the thickness of the steel plate protruding from the first clamping groove.

10. The fiber composite and steel interface bonding performance testing device according to claim 1, characterized in that: The force holding plate is provided with screw holes on both sides of the first clamping groove, and the positioning plate is provided with screw holes on both sides. The positioning plate and the screw holes of the force holding plate are connected by bolts.

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