A tensile-bending-torsion coupling test device for CFRP unidirectional plate

Abstract

The application discloses a tension-bending-torsion coupling test device for CFRP unidirectional plate, which comprises a transmission assembly, a movable connecting assembly, a fixing assembly, a transverse tension assembly, a longitudinal pressure assembly and a torsion assembly; the torsion assembly is connected with the CFRP unidirectional plate and connected with the movable connecting assembly at different angles to apply torsion load; the transverse tension assembly, the movable connecting assembly and the fixing assembly are coaxially connected through the transmission assembly, the transverse tension assembly applies horizontal tension to apply tensile load to the CFRP unidirectional plate; the longitudinal pressure assembly is sleeved on the CFRP unidirectional plate, and an external control assembly is connected with the longitudinal pressure assembly, and the longitudinal pressure assembly is driven by the external control assembly to apply bending load to the CFRP unidirectional plate. The device is used for studying the mechanical properties of the CFRP unidirectional plate under complex stress conditions, solving the problem that the current test device has a single loading mode and cannot meet the requirements of the test device for characterizing the material properties in actual engineering, and providing technical support for the mechanical property test of the CFRP unidirectional plate.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, specifically to a tension-bending-torsion coupling test device for CFRP one-way plates. Background Technology

[0002] Carbon fiber reinforced plastic (CFRP) has advantages such as light weight, high strength, corrosion resistance, fatigue resistance, and ease of transportation, and is currently widely used in the reinforcement and maintenance of bridges and various building components. Due to installation precision or actual working conditions, CFRP materials may be under a state of combined tension-bending-torsion stress in actual engineering projects.

[0003] Existing CFRP one-way plate mechanical property testing devices are mainly unidirectional loading devices, which are difficult to apply tension, bending and torsion to the specimen at the same time. Moreover, it is difficult to avoid the mutual influence between the tension-bending-torsion mechanisms, thus making it difficult to guarantee high tension and torsion loading accuracy. They cannot be applied to the application of tension-bending-torsion coupled stress and the complex stress scenarios of cables in actual service.

[0004] Therefore, there is an urgent need for a tension-bending-torsion coupled loading device for CFRP one-way plates to verify the mechanical properties of CFRP one-way plates, and to reduce the mutual stress of tension, bending and torsion. Summary of the Invention

[0005] To address the technical problems existing in the mechanical property testing devices for CFRP one-way plates, this invention provides a tension-bending-torsion coupled loading device for CFRP one-way plates. This device can simultaneously apply tensile loads, bending loads, and torsional loads to the specimen, and can simultaneously measure the axial linear deformation, bending deformation, and torsional angular deformation of the specimen, thereby achieving effective tension-bending-torsion coupled testing of CFRP one-way plates.

[0006] To achieve the above objectives, the present invention provides a tension-bending-torsion coupling test device for a CFRP one-way plate, comprising a first loading unit and a second loading unit, wherein the first loading unit and the second loading unit are arranged opposite to each other, forming a loading area for the CFRP one-way plate in the middle, for placing the CFRP one-way plate to be tested.

[0007] The first or second loading unit includes a transmission assembly, a movable connection assembly, a fixing assembly, a lateral tension assembly, a longitudinal compression assembly, and a torsion assembly;

[0008] The torsion assembly is connected to the CFRP one-way plate and is connected to the movable connection assembly at different angles, enabling the CFRP one-way plate connected to the torsion assembly to perform torsion operations to apply torsional loads.

[0009] The lateral tension component is sleeved on the transmission component, and the lateral tension component, the movable connecting component and the fixed component are coaxially connected through the transmission component. The lateral tension component applies a horizontal thrust, which causes the movable connecting component to drive the CFRP to perform a tensile operation relative to the fixed component, so as to apply a tensile load.

[0010] The longitudinal pressure application component is sleeved on the CFRP one-way plate, and its external control component drives the longitudinal pressure application component to perform a pressure operation on the CFRP in order to apply bending load.

[0011] Furthermore, the fixing component includes a reaction frame, a first reaction column, and a second reaction column; the first reaction column and the second reaction column are arranged opposite each other along a first direction, and the first reaction column and the second reaction column are arranged opposite each other to the reaction frame along a second direction. The first reaction column, the second reaction column, and the reaction frame form an installation area for a movable connection component. The first reaction column, the second reaction column, the movable connection component, and the reaction frame are sequentially connected by a transmission component.

[0012] Furthermore, the transmission assembly includes a first screw and a second screw, which are respectively arranged opposite to each other;

[0013] The first or second screw component includes a screw and a plurality of nuts. The screw passes through the first / second reaction column, the movable connecting assembly and the reaction frame in sequence. The screw connects the first / second reaction column, the movable connecting assembly and the reaction frame coaxially. The plurality of nuts are disposed on the screw.

[0014] Furthermore, there is a maneuverable space between the movable connecting component and the reaction frame, within which the movable connecting component can move axially relative to the reaction frame.

[0015] Furthermore, the movable connecting component has reserved holes at both ends for installing the transmission component, and the movable component has a first connecting hole symmetrically arranged in the middle for cooperating with the torsion component.

[0016] Furthermore, the lateral tension assembly includes a first jack and a second jack, which are respectively located between the movable connecting assembly and the first reaction column and the second reaction column, and are sleeved on the first screw member and the second screw member.

[0017] Furthermore, the torsion assembly includes a multi-angle conversion head, a conversion head, a first pin, a second pin, and an anchor; the anchor is connected to the CFRP one-way plate, the anchor is movably connected to the conversion head via the second pin, and the conversion head is movably connected to the multi-angle conversion head via the first pin.

[0018] Furthermore, the multi-angle conversion head is connected to the movable connecting assembly. The connection end of the multi-angle conversion head and the movable connecting assembly has a second connecting hole, which mates with the first connecting hole on the movable connecting assembly. By combining the second connecting hole on the multi-angle conversion head with the first connecting hole on the movable connecting assembly at different relative angles, an initial displacement angle can be applied to the CFRP unidirectional plate connected to the multi-angle conversion head. Furthermore, the longitudinal pressure application assembly includes a rotating block, a steering roller, and a fixed block. The fixed block has a slot at its center, through which the longitudinal pressure application assembly can be mounted on the CFRP unidirectional plate. The rotating block is located around the fixed block and can rotate along its circumference. The steering roller is mounted on the rotating block.

[0019] Furthermore, the rotating block includes a block body and several rollers. The block body has a through hole in the middle and forms a circumferential mounting groove with the periphery of the fixed block. The several rollers are disposed in the mounting groove and are fitted to the fixed block. The several rollers enable the block body to rotate along the circumference of the fixed block.

[0020] The CFRP one-way plate tension-bending-torsion coupling loading device provided by this invention is used to study the mechanical properties of CFRP one-way plates under complex stress conditions. It solves the problem that the current test devices have a single loading method and cannot meet the test device requirements for characterizing material properties in actual engineering. It provides technical support for the mechanical property testing of CFRP one-way plates. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a schematic diagram of the tension-bending-torsion coupling test device for this CFRP plate;

[0023] Figure 2 This is a schematic diagram of the movable connection component structure in the tension-bending-torsion coupling test device for this CFRP board;

[0024] Figure 3 This is a schematic diagram of the torsion assembly structure in the tension-bending-torsion coupling test device for this CFRP plate;

[0025] Figure 4 This is a schematic diagram of the conversion head structure in the tension-bending-torsion coupling test device for this CFRP plate;

[0026] Figure 5 This is a schematic diagram of the multi-angle conversion head structure in the tension-bending-torsion coupling test device for this CFRP plate;

[0027] Figure 6This is a partial view of the longitudinal pressure component in the tension-bending-torsion coupling test apparatus for this CFRP plate;

[0028] Figure 7 This is a schematic diagram of the disassembly of the longitudinal pressure component in the tension-bending-torsion coupling test device for this CFRP board.

[0029] The following are the component labels in the attached diagram:

[0030] 100. Fixing assembly; 110. Reaction frame; 120. First reaction column; 130. Second reaction column; 200. Transmission assembly; 210. Screw; 220. First nut; 230. Second nut; 240. Third nut; 300. Movable connection assembly; 310. Reserved hole; 320. First connecting hole; 400. Lateral tension assembly; 410. First jack; 420. Second jack; 500. Torsion assembly; 510. Multi-angle conversion head; 511. First pin hole; 512. Second connecting hole; 513. First pin; 520. Conversion head; 521. Second pin; 522. Second pin hole; 523. Third pin hole; 530. Anchor; 600. Longitudinal pressure assembly; 610. Rotating block; 611. Block; 612. Roller; 613. Mounting groove; 614. Cage; 615. Mounting groove; 620. Fixing block; 621. Groove; 630. Steering roller; 700. CFRP one-way plate. Detailed Implementation

[0031] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0032] Existing CFRP one-way plate mechanical property testing devices mostly use torsion testing machines, universal testing machines, etc., which restrict the placement of specimens, are not conducive to space utilization and specimen adjustment, and cannot effectively realize tension-torsion coupling tests.

[0033] To address this issue, the present invention provides a tension-bending-torsion coupling loading device for CFRP one-way plates, which can be used to study the mechanical properties of CFRP one-way plates under complex stress conditions. This solves the problem that the current test devices have a single loading method and cannot meet the requirements of test devices for characterizing material properties in actual engineering, thus providing technical support for the mechanical property testing of CFRP one-way plates.

[0034] The innovative design of this CFRP one-way plate tension-bending-torsion coupled loading device enables simultaneous tension, bending, and torsion operations. This allows for the simultaneous application of tensile, bending, and torsional loads to the specimen, and simultaneous measurement of the axial linear deformation, bending deformation, and torsional angular deformation of the specimen. This enables effective tension-bending-torsion coupled testing of CFRP one-way plates.

[0035] In this CFRP one-way plate tension-bending-torsion coupled loading device, when tension, bending and torsion operations are applied to the sample simultaneously, the mutual influence between the corresponding operating mechanisms is small, which can ensure the accuracy of tension and torsion loading.

[0036] See Figure 1 The diagram shows an example of the configuration of the CFRP unidirectional plate tension-bending-torsion coupling loading device provided in this solution.

[0037] As shown in the figure, the CFRP one-way plate tension-bending-torsion coupling loading device includes a first loading unit and a second loading unit. The first loading unit and the second loading unit are arranged opposite to each other, forming a loading area of ​​the CFRP one-way plate in the middle. The two ends of the CFRP one-way plate are connected to the first loading unit and the second loading unit respectively. Tensile load, bending load and torsional load can be applied to the CFRP one-way plate simultaneously through the first loading unit and the second loading unit.

[0038] See Figure 1 The first or second loading component includes a transmission component 200, a movable connection component 300, a fixing component 100, a lateral tension component 400, a longitudinal pressure component 600, and a torsion component 500.

[0039] The fixing component 100 includes a reaction frame 110, a first reaction column 120, and a second reaction column 130.

[0040] In this scheme, the reaction frame 110 is preferably a triangular reaction frame. Theoretically, a triangle has stability, which can ensure the stability of the test device when it is placed.

[0041] The first reaction column 120 and the second reaction column 130 are arranged opposite to the reaction frame and are symmetrically arranged. There is a gap between the first reaction column 120 and the second reaction column 130 and the reaction frame to form the installation area of ​​the movable connection component 300. The first reaction column 120, the second reaction column 130, the movable connection component 300 and the reaction frame 110 are connected in sequence through the transmission component 200.

[0042] The transmission assembly 200 includes a first screw and a second screw, which are respectively arranged opposite to each other. The first and second screws connect the first reaction column 120 and the second reaction column 130 to the reaction frame 110.

[0043] The first or second screw component includes a screw 210, a first nut 220, a second nut 230, and a third nut 240.

[0044] The screw 210 passes through the first reaction column 120, the second reaction column 130, the movable connecting assembly 300, and the reaction frame 110 in sequence. The screw 210 connects the first reaction column 120, the second reaction column 130, the movable connecting assembly 300, and the reaction frame 110 coaxially. At the same time, the first nut 220, the second nut 230, and the third nut 240 are all provided on the screw 210.

[0045] The first nut 220 is disposed on the first side of the reaction frame 110 and is fitted to the reaction frame 110 to limit the reaction frame 110 and prevent the reaction frame 110 from detaching from the screw 210 during the driving tension process, thus affecting the reliability of the loading device during operation.

[0046] The third nut 240 is disposed on the first side of the first reaction column 120 / second reaction column 130 and is fitted to the first reaction column 120 / second reaction column 130 to lock and limit the first reaction column 120 / second reaction column 130, preventing the first reaction column 120 / second reaction column 130 from detaching from the screw and affecting the operation of this loading device.

[0047] The second nut 230 is disposed on the second side of the reaction frame 110. An adjustable gap is left between the second nut 230 and the second side of the reaction frame 110. The second nut 230 can move axially relative to the second side of the reaction frame 110 in a relaxed state.

[0048] The movable connection assembly 300 is used to connect the CFRP one-way plate 700 to the screw 210, see [reference]. Figure 2 The movable connecting component 300 has reserved holes 320 at both ends for installing screws 210. The movable connecting component 300 is positioned between the first reaction column 120 / second reaction column 130 and the reaction frame 110 by passing the screws 210 through the reserved holes 230 and is connected to the first reaction column 120 / second reaction column 130 and the reaction frame 110.

[0049] Meanwhile, since there is an adjustable space between the second nut 230 and the second side of the reaction frame 110, the movable connecting component 300 provided between the reaction frame 110 and the second nut 230 can move axially along the screw 210 relative to the second side of the reaction frame 110 in the same way as the second nut 230 when the second nut 230 is relaxed, and can stretch the CFRP one-way plate 700 connected to the movable connecting component 300 longitudinally.

[0050] Meanwhile, the movable connection component 300 is symmetrically provided with a first connection hole 320 in the middle for connecting with the torsion component 500.

[0051] The lateral tension assembly 400 cooperates with the movable connection assembly 300 to apply a lateral tension to the CTRP plate 700. The lateral tension assembly 400 includes a first jack 410 and a second jack 420. The first jack 410 and the second jack 420 are respectively located between the movable connection assembly 300 and the first reaction column 120 and the second reaction column 130 and are sleeved on the first screw member and the second screw member.

[0052] The first jack 410 and the second jack 420 apply a horizontal thrust, causing the movable connecting component 300 to move axially toward the reaction tripod 110. At the same time, they pull the CFRP one-way plate 700 connected to the movable connecting component 300 to apply a lateral tensile force, ultimately causing the CFRP one-way plate 700 to be in a tensile stress state.

[0053] See Figure 3 The torsion assembly 500 includes a multi-angle conversion head 510, a conversion head 520, and an anchor 530. The torsion assembly 500 is connected to the movable connection assembly 300 through the multi-angle conversion head 510. The torsional load of the CFRP one-way plate 700 connected to the torsion assembly 500 is realized through the multi-angle connection between the multi-angle conversion head 510 and the movable connection assembly 300.

[0054] Furthermore, the anchor 530 includes an upper clamping plate and a lower clamping plate, which are arranged opposite to each other, and a clamping area adapted to the CFRP one-way plate 700 is formed between their first ends.

[0055] See Figure 4 The adapter 520 has a square groove structure formed by a rear plate and symmetrically distributed side walls on the upper and lower sides. A corresponding mounting groove area is formed in the middle region of the side walls. This mounting groove area is adapted to the anchor 530 and can accommodate the anchor 530. Simultaneously, corresponding second pin holes 522 are formed in the middle region of the side walls. This facilitates placing one end of the anchor 530 in the mounting groove, and with the second pin 521 passing through the adapter 520 and the anchor 530, the adapter 520 and the anchor 530 are movably connected, allowing the anchor 530 to rotate in a first direction relative to the adapter 520 around the second pin 521.

[0056] Meanwhile, the adapter 520 has a connecting plate on its rear plate, which has a third pin hole 523. The first pin 513 is used to connect the adapter 510 to the multi-angle adapter 510.

[0057] For details, see Figure 5 The multi-angle converter head 510 has a square groove structure formed by the back plate and the side walls symmetrically distributed on both sides.

[0058] The two side walls are provided with first pin holes 511. By setting a first pin 513 to pass through the first pin hole 513 of the multi-angle conversion head 510 and the third pin hole 523 on the conversion head 520, the conversion head 520 and the multi-angle conversion head 510 are movably connected, so that the anchor 530 can rotate in a second direction relative to the multi-angle conversion head 510 around the first pin 513.

[0059] By cooperating with the converter head 520 and the multi-angle converter head 510, the anchor 530 can rotate in two dimensions. During tensile and / or torsional operations, when the coaxiality between the anchor 530 and the converter head 520 and multi-angle converter head 510 changes, the anchor 530 will adjust its position relative to the converter head 520 and multi-angle converter head 530 according to the force changes. This ensures that the tension exerted by the converter head 520 and multi-angle converter head 510 on the anchor 530 remains coaxial with the anchor 530. This guarantees that the CFRP one-way plate 700 always receives coaxial tension, effectively preventing stress in other directions, improving the stability of the CFRP one-way plate 700 during testing, avoiding damage to the CFRP one-way plate 700, and ensuring the accuracy of subsequent performance test results.

[0060] The rear plate of the multi-angle converter 510 has a second connecting hole 512 around its circumference, which cooperates with the first connecting hole 320 on the movable connecting assembly 300. By combining the second connecting hole on the multi-angle converter 510 with the first connecting hole 320 on the movable connecting assembly 300 at different angles, the initial torsion of the CFRP unidirectional plate 700 connected to the multi-angle converter 510 can be achieved, ultimately causing the CFRP unidirectional plate 700 to generate a torsional stress state.

[0061] The longitudinal pressure assembly 600 is used to apply a downward load to the CFRP one-way plate 700, and the longitudinal pressure assembly 600 is disposed in the middle of the CFRP one-way plate 700.

[0062] See Figure 6 This is a partial structural diagram of the longitudinal pressure assembly without a cage in the tension-bending-torsion coupling test device for this CFRP plate. The longitudinal pressure assembly 600 includes a rotating block 610, a fixed block 620, and a steering roller 630.

[0063] The fixing block 620 has a slot 621 in the center. The size of the slot 621 is adapted to the CFRP one-way plate 700 and is used to install the CFRP one-way plate 700. The longitudinal pressure assembly 600 can be installed in the middle of the CFRP one-way plate 700 through the slot 621.

[0064] The rotating block 610 is located around the fixed block 620 and can rotate along the circumference of the fixed block 620.

[0065] See Figure 7 The rotating block 610 includes a block body 611, a plurality of roller bodies 612 and a retainer 614. The block body 611 has a through hole in the middle and forms a circumferential mounting groove 613 with the periphery of the fixed block 620. The retainer 614 is disposed in the mounting groove 613 and is fixedly connected to the fixed block 620.

[0066] The retainer 614 is provided with several mounting slots 615, and several rollers 612 are disposed in the mounting slots 615 and are fitted to the block 611. The block 611 can be rotated along the circumference of the fixed block 620 by the rollers 612.

[0067] By setting a retainer 614 in the placement groove 613, several rollers 612 can be evenly separated to avoid mutual interference and friction.

[0068] The steering roller 630 is mounted on the rotating block 610 and connected to common testing equipment such as actuators or jacks and loaded. The testing equipment applies pressure to the steering roller 630, causing the CFRP one-way plate 700 to be in a bending stress state.

[0069] Meanwhile, the steering roller 630, which is mounted on the rotating block 610, can rotate relative to the fixed block during the loading process, thereby offsetting the stress generated in other directions. This prevents the generation of stress in other directions when the steering roller 630 is loaded and drives the CFRP one-way plate 700 to bend, thus avoiding damage to the CFRP one-way plate 700, ensuring the accuracy of subsequent performance test results, and ensuring that the torque is not affected.

[0070] In summary, tensile load, bending load and torsional load are simultaneously applied to the CFRP one-way plate 700 through the first loading unit and the second loading unit.

[0071] Depending on the circumstances, this solution can also be configured with a transverse tension component 400, a longitudinal pressure component 600, and a torsion component 500 only in the first or second loading unit, which can apply unidirectional tension, bending, and torsion loading to the CFRP unidirectional plate 700.

[0072] Regarding the CFRP unidirectional plate tension-torsion coupling loading device given in this example, the specific implementation and application process of this CFRP unidirectional plate tension-torsion coupling loading device will be explained in detail below with reference to its specific structure.

[0073] In the implementation of this CFRP one-way plate tension-bending-torsion coupling loading device, in order to effectively test the mechanical properties of the CFRP one-way plate sample 700, a corresponding test control component can be further introduced. This test control component controls the first jack 410, the second jack 420, and the steering roller 630 in the CFRP one-way plate tension-bending-torsion coupling loading device, and is used to generate corresponding control commands according to the mechanical performance requirements of the CFRP one-way plate to control the organic coordination between the first jack 410, the second jack 420, and the steering roller 630.

[0074] The specific composition of the test control components is not limited here; it can be determined according to actual needs.

[0075] Therefore, when conducting mechanical property tests on CFRP one-way plates based on this tension-bending-torsion coupling loading device, the setup of the device is first completed, and the specific process is as follows:

[0076] S1: Install the first loading device and the second loading device, fix the reaction frame 110, the first reaction column 120 and the second reaction column 130 to the operating platform with anchor bolts, and make threaded holes on the reaction frame, the movable connecting component 300, the first reaction column 120 and the second reaction column 130 according to the diameter of the screw assembly.

[0077] S2: The first screw and the second screw are arranged opposite to each other and pass through the reaction frame 110, the movable connecting assembly 300, the first reaction column 120 and the second reaction column 130 in sequence, connecting the reaction frame 110, the movable connecting assembly 300 and the first reaction column 120 and the second reaction column 130 into a whole. The first nut 220, the second nut 230 and the third nut 240 are respectively set on the screw 210 to limit the reaction frame 110, the first reaction column 120 and the second reaction column 130.

[0078] S3: The first jack 410 and the second jack 420 are respectively fitted between the first reaction column 120, the second reaction column 130 and the movable connecting assembly 300. The CFRP one-way plate 700 is connected to the multi-angle conversion head 510 through the anchor 530; the multi-angle conversion head 510 and the movable connecting assembly 300 are connected.

[0079] S5: The slot 621 on the longitudinal pressure assembly 600 is fitted onto the CFRP unidirectional plate 700, and the top steering roller 630 is set in conjunction with the test control assembly.

[0080] After the device is installed, the CFRP one-way plate 700 can be initially torn by combining different angles of the second connecting hole 512 on the multi-angle conversion head 510 and the first connecting hole 320 on the movable connecting frame 300, and finally the CFRP one-way plate 700 will be in a torsional stress state.

[0081] Secondly, the first jack 410, the second jack 420, and the steering roller 630 in the CFRP one-way plate tension-bending-torsion coupling loading device are controlled by the corresponding test control components. This is used to generate corresponding control commands based on the mechanical performance requirements of the CFRP one-way plate to control the organic coordination between the first jack 410, the second jack 420, and the steering roller 630.

[0082] Specifically, the test control component first controls the movement of the first jack 410 and the second jack 420, synchronously driving the movable connection component 300 to move axially in the direction of the reaction frame 110, while simultaneously pulling the CFRP one-way plate 700 connected to the movable connection component 300 to apply a lateral tensile force, ultimately causing the CFRP one-way plate 700 to generate a tensile stress state.

[0083] Because the anchors 530 clamping and connecting the two ends of the CFRP one-way plate 700 are pin-connected (i.e., oscillating connections) to the multi-angle conversion head 510 and the conversion head 520 respectively, the anchors 530 can rotate in two dimensions. Thus, when the coaxiality between the anchors 530 and the conversion heads 520 and 510 changes during the tension and / or torsion operations, the anchors 530 will oscillate and adjust relative to the conversion heads 520 and 510 according to the force changes. This ensures that the tension and torsion operations do not affect each other, and also avoids the generation of negative bending moments in the CFRP one-way plate 700 at the anchor connection, ensuring the accuracy of subsequent performance test results.

[0084] Secondly, the test control component applies pressure to the steering roller 630, causing the steering roller 630 to apply downward / upward pressure to the CFRP one-way plate 700, causing the CFRP one-way plate 700 to bend.

[0085] When the steering roller 630 is pressed under the drive of the test control component, the steering roller 630 can rotate relative to the CFRP one-way plate 700 through the internal roller body 612 to achieve adaptive adjustment, effectively avoid the CFRP one-way plate 700 from generating stress in other directions, and ensure that it does not interfere with the tension and torque, thus ensuring the accuracy of tension and torque loading.

[0086] As can be seen, the tension-bending-torsion coupled loading device for CFRP one-way plates presented in this example can provide tension-bending-torsion coupled loads for CFRP one-way plates, thereby studying the mechanical properties of CFRP one-way plates under complex stress conditions. This solves the problem that the current test devices have a single loading method and cannot meet the test device requirements for characterizing material properties in actual engineering, and provides technical support for the mechanical property testing of CFRP one-way plates.

[0087] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A tension-bending-torsion coupling test device for CFRP one-way plates, characterized in that, It includes a first loading unit and a second loading unit, which are arranged opposite to each other, forming a loading area for a CFRP unidirectional board in the middle, used to place the CFRP unidirectional board to be tested; The first or second loading unit includes a transmission assembly, a movable connection assembly, a fixing assembly, a lateral tension assembly, a longitudinal compression assembly, and a torsion assembly; The torsion assembly is connected to the CFRP one-way plate and is connected to the movable connection assembly at different angles, enabling the CFRP one-way plate connected to the torsion assembly to perform torsion operations to apply torsional loads. The lateral tension component is sleeved on the transmission component, and the lateral tension component, the movable connecting component and the fixed component are coaxially connected through the transmission component. The lateral tension component applies a horizontal thrust, which causes the movable connecting component to drive the CFRP to perform a tensile operation relative to the fixed component, so as to apply a tensile load. The longitudinal pressure application assembly is mounted on the CFRP one-way plate and is connected to an external control assembly. The external control assembly drives the longitudinal pressure application assembly to apply pressure to the CFRP to apply bending load. The longitudinal pressure application assembly includes a rotating block, a steering roller, and a fixed block. The fixed block has a slot in its center, through which the longitudinal pressure application assembly can be mounted on the CFRP one-way plate. The rotating block is located around the fixed block and can rotate along the circumference of the rotating block. The steering roller is located on the rotating block. The rotating block includes a block body and several rollers. The block body has a through hole in its center and forms a circumferential mounting groove with the periphery of the fixed block. The several rollers are located in the mounting groove and fit against the fixed block, allowing the block body to rotate along the circumference of the fixed block.

2. The tension-bending-torsion coupling test device for a CFRP unidirectional plate according to claim 1, characterized in that, The fixing component includes a reaction frame, a first reaction column, and a second reaction column; the first reaction column and the second reaction column are arranged opposite each other along a first direction, and the first reaction column and the second reaction column are arranged opposite each other to the reaction frame along a second direction. The first reaction column, the second reaction column, and the reaction frame form an installation area for a movable connecting component. The first reaction column, the second reaction column, the movable connecting component, and the reaction frame are sequentially connected by a transmission component.

3. The tension-bending-torsion coupling test device for a CFRP unidirectional plate according to claim 1, characterized in that, The transmission assembly includes a first screw and a second screw, which are respectively arranged opposite to each other; The first or second screw component includes a screw and a plurality of nuts. The screw passes through the first / second reaction column, the movable connecting assembly and the reaction frame in sequence. The screw connects the first / second reaction column, the movable connecting assembly and the reaction frame coaxially. The plurality of nuts are disposed on the screw.

4. The tension-bending-torsion coupling test device for a CFRP unidirectional plate according to claim 2, characterized in that, There is a maneuverable space between the movable connecting component and the reaction frame, within which the movable connecting component can move axially relative to the reaction frame.

5. The tension-bending-torsion coupling test device for a CFRP unidirectional plate according to claim 1, characterized in that, The movable connecting component has reserved holes at both ends for installing the transmission component, and a first connecting hole symmetrically provided in the middle of the movable connecting component for connecting with the torsion component.

6. The tension-bending-torsion coupling test device for a CFRP unidirectional plate according to claim 3, characterized in that, The lateral tension assembly includes a first jack and a second jack, which are located between the movable connecting assembly and the first reaction column and the second reaction column, respectively, and are sleeved on the first screw and the second screw.

7. The tension-bending-torsion coupling test device for a CFRP unidirectional plate according to claim 1, characterized in that, The torsion assembly includes a multi-angle conversion head, a conversion head, a first pin, a second pin, and an anchor; the anchor is connected to a CFRP one-way plate, the anchor is movably connected to the conversion head via the second pin, and the conversion head is movably connected to the multi-angle conversion head via the first pin.

8. The tension-bending-torsion coupling test device for a CFRP unidirectional plate according to claim 7, characterized in that, The multi-angle converter head is connected to the movable connection component. The connection end of the multi-angle converter head and the movable connection component is provided with a second connection hole, which cooperates with the first connection hole on the movable connection component. By installing the second connection hole on the multi-angle converter head and the first connection hole on the movable connection component at different relative angles, an initial displacement angle can be applied to the CFRP unidirectional plate connected to the multi-angle converter head.

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