A tensile-bending coupling experimental device and experimental method

Abstract

The application discloses a kind of experimental devices of drawing-bending coupling, comprising: drawing clamp module, support module, the drawing clamp module is connected with the support module;The drawing clamp module includes tenon clamp, rotating shaft, the rotating shaft is arranged in the both sides of tenon clamp, the inside of tenon clamp is equipped with clamping groove, it is characterized in that, the tenon clamp and rotating shaft are integrally formed, the clamping groove extends to the end position of at least one rotating shaft in the direction of rotating shaft.This device in drawing clamp module simple structure, can make the test piece directly slip into clamping groove, it is convenient to dismount, improve experimental efficiency.The application also discloses experimental method using the device, by connecting external loading device to carry out experiment, to a certain extent, the structure of the experimental device is optimized, to be suitable for different testing machine and external loading device.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of experimental equipment, and particularly relates to an experimental device and an experimental method for a tension-bending coupling experiment. BACKGROUND

[0002] In reality and engineering, there is often a tension-bending coupling load working condition of a long block-shaped test piece, but there is currently a lack of a general and simple device to complete this experiment.

[0003] A document with Chinese Patent No. CN111855413A discloses a tension-bending coupling strength experimental system for a composite fan blade root element level sample, which can be applied to tension-bending coupling strength experiments of a root tenon. The specific structure is shown in Figure 1 The device includes a mounting shaft 1, a system base 2, a tenon clamp 3, a tenon test piece 4, a cross beam pull rod 5, a blade clamp 6, a pull hook 7, a limiting block 8, a limiting rack 9 containing a force sensor, a hydraulic cylinder 10, a hydraulic cylinder mounting rack 11, and a connecting rod 12 containing a force sensor. As shown in Figure 2 One end of the tenon test piece 4 is fixed by being clamped in the clamping groove of the tenon clamp 3. After the tenon test piece 4 is installed in the clamping groove of the tenon clamp 3, a rotating shaft 13 is installed. The rotating shaft 13 is arranged on a bearing and is fixed to the tenon clamp 3 through a flange 16 to realize the rotating function of the tenon clamp 3. The other end of the tenon test piece 4 is fixed to the blade clamp 6 through eight bolts. The blade clamp 6 is connected to the limiting block 8 through the cross beam pull rod 5 and the pull hook 7. After the pull hook 7 is connected to a tensile testing machine, the height is adjusted so that the tenon part of the test piece is placed in the mortise and is in a natural hanging state. The cross beam pull rod 5 is adjusted so that the tensile center is aligned with the center of the test piece.

[0004] Although the structure of this test system can complete the measurement of the tension coupling of the test piece, it is relatively complex and troublesome to disassemble and assemble, which affects the experimental efficiency, the coaxiality is not high, and it needs to be matched with a specific testing machine. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the defects of the prior art, such as complex structure, low efficiency, and the need to be matched with a specific testing machine. The present application provides an experimental device and an experimental method for a tension-bending coupling experiment, which is convenient to install, has high experimental efficiency, and does not need to be matched with a specific testing machine.

[0006] The present application solves the above technical problems by the following technical solutions:

[0007] The utility model provides an experimental device of test piece tensile bending coupling, comprising: a tensile clamp module, a support module, the tensile clamp module is connected with the support module, the tensile clamp module includes a tenon clamp, rotation shaft is arranged in both sides of the tenon clamp, the inside of tenon clamp is equipped with the clamping groove, the tenon clamp and rotation shaft are integrally formed, the clamping groove extends to the end position of at least one rotation shaft along the axial extension direction of rotation shaft.

[0008] In the technical solution, the clamping groove can extend to the end position of at least one rotation shaft along the direction of the rotation shaft, so that the test piece can be directly inserted into the clamping groove, facilitating the loading and unloading of the test piece.

[0009] Preferably, the clamping groove extends to the end position of both rotation shafts along the axial extension direction of the rotation shaft.

[0010] In the technical solution, compared with extending to one end, extending to the end position of both rotation shafts can make the fixation of the test piece more stable, which is beneficial to the accuracy of subsequent test results.

[0011] Preferably, the cross-sectional shape of the clamping groove on the tenon clamp is one of hammer-shaped, square-shaped, and circular-shaped.

[0012] In the technical solution, the cross section of the clamping groove has several shapes to choose from to adapt to the end shape of different test pieces.

[0013] Preferably, the tensile clamp module further comprises a bending moment loading arm, the tensile clamp module further comprises a bending moment loading arm, the rotation shaft is provided with a first connector, the bending moment loading arm is provided with a second connector, and the first connector and the second connector are connected in cooperation.

[0014] In the technical solution, the mortise and tenon structure can limit the twisting of components in all directions, ensure the fastening of components, facilitate loading and unloading, and avoid the problem of wasting time in loading and unloading using several bolts.

[0015] Preferably, the first connector and the second connector are hexagonal in shape.

[0016] In the technical solution, the first connector and the second connector are hexagonal, which is more solid and stable than other shapes. When subjected to pressure, the force is not concentrated in one point but evenly distributed on each side, which reduces the pressure on each side.

[0017] Preferably, the bending moment loading arm comprises a circular end and a square end; the second connector is arranged on the circular end, and the square end is used to connect with an external loading device.

[0018] The circular end of the bending moment loading arm and the second connector arranged on the circular end are matched with the shape of the rotating shaft and the first connector arranged on the rotating shaft.

[0019] Preferably, the number of the bending moment loading arms is two, and the square end is provided with a connecting component for connecting the bending moment loading arms.

[0020] In the technical solution, the bending moment loading arms can be synchronously rotated and uniformly stressed by arranging the connecting component, so that the accuracy of the test is ensured.

[0021] Preferably, the tensile clamp module further comprises a universal joint, and the end of the test piece away from the tenon clamp is connected to the tensile testing machine through the universal joint.

[0022] In the technical solution, the universal joint can eliminate the bending moment in the other two dimensions and prevent the occurrence of the tension-bending-torsion coupling.

[0023] Preferably, the test piece is provided with pads on both sides, the pads are located between the universal joint and the test piece, and the thickness of the pad on one side is different from that of the pad on the other side.

[0024] In the technical solution, the thickness of the pads on both sides is different so that the test piece is still on the same axis during the tension-bending process.

[0025] The application also provides a tension-bending coupling test method, which comprises the experimental device of any one of the above and specifically comprises the following steps.

[0026] S1, moving the upper head and the lower head of the testing machine to a suitable position to facilitate the installation and fixation of the testing machine and the clamp.

[0027] S2, connecting the connecting component for connecting the bending moment loading arms with the external equipment digital display jack; starting the test program and starting the test by turning on the electronic universal testing machine and the digital display jack.

[0028] The positive progress effect of the application is that the device can be applied to the tension-bending coupling test of a test piece with a large size; the bending moment error in the other two dimensions is eliminated by the universal joint during the tension process of the test piece, so that the influence on the test accuracy is avoided; the whole tension-bending coupling test can be used in combination with most testing machines on the market; the installation and disassembly of the whole device are facilitated due to the use of the mortise and tenon mechanism, the test efficiency is high, and the batch tension-bending coupling test of long block test pieces is easy to implement. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1It is the structural schematic view of the tensile-bending coupling strength experimental device in the prior art;

[0030] Figure 2 It is the structural schematic view of the tensile-bending coupling strength experimental device in the prior art;

[0031] Figure 3 It is the structural schematic view of the tensile-bending coupling strength experimental device in the prior art;

[0032] Figure 4 It is the structural schematic view of the tensile-bending coupling strength experimental device in the prior art;

[0033] Explanation of reference numerals

[0034] Prior art:

[0035] Mounting shaft 1

[0036] System base 2

[0037] Tenon clamp 3

[0038] Tenon sample piece 4

[0039] Cross beam pull rod 5

[0040] Blade clamp 6

[0041] Pull hook 7

[0042] Limiting block 8

[0043] Limiting frame containing force sensor 9

[0044] Hydraulic cylinder 10

[0045] Hydraulic cylinder mounting frame 11

[0046] Connecting rod 12

[0047] Rotary shaft 13

[0048] Flange 16

[0049] The present application:

[0050] One-way connecting head 1

[0051] Two-way connecting groove 2

[0052] Two-way connecting head 3

[0053] Connecting fastening block 4

[0054] Fastening bolt 5

[0055] First pad 6

[0056] Pin column 7

[0057] Second pad 8

[0058] Test piece 9

[0059] Bending moment loading arm 10

[0060] Connecting bolt 11

[0061] Support fixing tile box 12

[0062] Bearing 13

[0063] Test piece clamping shaft 14

[0064] Tenon clamp 141

[0065] Rotary shaft 142

[0066] Support fixing plate 15

[0067] Fastening bolt 16 Detailed Implementation

[0068] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0069] Example 1

[0070] like Figures 3 to 4 As shown, a tension-bending coupling experimental device includes: a tension clamp module and a support module, with the tension clamp module connected to the support module. The tension clamp module includes a tenon clamp 141 and a rotating shaft 142, with the rotating shaft 142 positioned on both sides of the tenon clamp 141. A slot is provided inside the tenon clamp 141, which mates with the end shape of the test piece to restrict the translational degrees of freedom in two dimensions and the rotational degrees of freedom in three dimensions of the test piece. This slot allows the test piece to slide directly into the slot, facilitating the loading and unloading of the test piece and improving experimental efficiency.

[0071] The tenon clamp 141 and the rotating shaft 142 are integrally formed as the test piece clamping shaft 14, and the slots extend along the axial extension direction of the rotating shaft 142 to the end positions of the two rotating shafts respectively.

[0072] The groove cross-section shape on the tenon clamp 141 can be hammer-shaped, square, or round. Since there are several possible shapes for the groove cross-section, it can be adapted to the end shape of different test pieces.

[0073] The stretching clamp module further comprises a bending moment loading arm 10, the rotating shaft 142 is provided with a first connector, the bending moment loading arm 10 is provided with a second connector, and the first connector and the second connector are connected in a matched mode. The first connector and the second connector are in a mortise and tenon structure, and are hexagonal in shape. The mortise and tenon structure can limit the twisting of components in all directions, ensure the fastening of components, and facilitate disassembly, thereby avoiding the problem of time waste caused by the use of a plurality of bolts for connection and disassembly. In addition, the first connector and the second connector are hexagonal, which is more solid and stable than other shapes. When subjected to extrusion, the force is not concentrated at a point, but is evenly distributed to each edge, thereby reducing the pressure on each edge.

[0074] The bending moment loading arm 10 is geometrically key-shaped, comprising a circular end and a square end, the second connector is arranged at the circular end, and the square end is used for connecting with an external loading device. The bending moment loading arms 10 are symmetrically arranged on both sides of the test piece 9, and the square head end is provided with a connecting component for connecting the bending moment loading arms, and the connecting component is a bolt. The connecting component can make the bending moment loading arms rotate synchronously and bear force uniformly, so as to ensure the accuracy of the test.

[0075] It should be noted that the bending moment loading arm can also be an integral whole, and the number of the bending moment loading arms is not limited here, as long as the bending moment loading arms can be connected with the external loading device and can be used for the tension-bending-torsion coupling test.

[0076] The stretching clamp module further comprises a universal joint, which can eliminate the bending moment in the other two dimensions and prevent the occurrence of tension-bending-torsion coupling. The end of the test piece 9 away from the tenon clamp 141 is connected to the tensile testing machine through the universal joint. The universal joint comprises a one-way joint 1, a two-way connecting groove 2, a two-way joint 3 and a connecting fastening block 4, and the one-way joint 1, the two-way connecting groove 2, the two-way joint 3 and the connecting fastening block 4 are connected in a matched mode.

[0077] The one-way joint 1 comprises a first cylinder and a second cylinder, and the top end of the two-way connecting groove 2 is provided with a through hole; the first cylinder is connected with the two-way connecting groove 2 through the through hole at the top end of the two-way connecting groove 2, and is clamped in the two-way connecting groove 2 through the second cylinder, a through hole is formed in the first cylinder and used for connecting with the electronic universal testing machine.

[0078] The lower side of the two-way connecting groove 2 comprises two ear-shaped protrusions, a through hole is formed in each protrusion, the two-way joint 3 is connected with the two-way connecting groove 2 through a pin 7, the pin 7 is in interference fit with the two-way connecting groove 2, and the pin 7 is connected with the connecting fastening block 4.

[0079] The connecting fastening block 4 comprises a circular end and a square end, the circular end is provided with a through hole, the square end is provided with a bolt hole, the bidirectional connecting head 3 is connected with the connecting fastening block 4 through the through hole, and the first pad 6 is further arranged between the bidirectional connecting head 3 and the through hole.

[0080] The second pad 8 is arranged on the two sides of the test piece 9 and is located between the universal connecting head and the test piece 9, and the pad on one side needs to be different from the pad on the other side. This is to make the test piece still on the same axis during the process of bending and tension, so as to avoid the axis offset and affect the experimental results.

[0081] The supporting module in the device comprises a bearing 13, a support fixed tile box 12, a support fixed plate 15, a fixed bolt 16, the bending moment loading arm 10 and the test piece clamping shaft 14 are installed on the support fixed tile box 12 through the bearing 13, the support fixed tile box 12 is connected with the support fixed plate 15 through the fixed bolt 16, and a plurality of bolt holes are arranged on the support fixed plate 15.

[0082] Embodiment 2

[0083] The application further provides an experimental method using the bending and tension coupling device in embodiment 1, and the experimental method comprises the following steps.

[0084] S1, the upper head and the lower head of the testing machine are moved to appropriate positions, so as to facilitate the installation and fixation of the testing machine and the clamp.

[0085] In S1, specifically, the upper head of the testing machine is moved to an appropriate position, so as to facilitate the installation of the testing machine and the clamp. First, the support fixed plate 15 is fastened to the lower head of the testing machine by the fastening bolt 16 and is centered. Then, the support fixed tile box 12 is fastened on the support fixed plate 15 by the fastening bolt 16. Finally, the upper head is moved to an appropriate position, and the upper head is fastened with the unidirectional connecting head 1 by the fastening bolt.

[0086] S2, the connecting part for connecting the bending moment loading arm is connected with the external equipment digital display jack; the whole process should keep the upper clamp and the lower clamp loose to the test piece, so as to prevent significant damage to the test piece before the experiment. The electronic universal testing machine and the digital display jack are started, the test program is started, and the test is started.

[0087] In this embodiment, the digital display jack is placed on the ground, so as to avoid that the reaction force of the digital display jack acts on the experimental device and damages the device.

[0088] Although the specific embodiments of the present application have been described above, it is understood by those skilled in the art that the present application is only illustrated by way of example, and the scope of protection of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to the embodiments without departing from the principles and essence of the present application, and such changes and modifications fall within the scope of protection of the present application.

Claims

1. An experimental setup for stretch-bend coupling, comprising: The stretching clamp module is connected with the supporting module; the stretching clamp module comprises a tenon clamp and rotating shafts arranged on both sides of the tenon clamp, and the tenon clamp is internally provided with a clamping groove; the tenon clamp and the rotating shafts are integrally formed, and the clamping groove extends to the end position of at least one of the rotating shafts along the axial extension direction of the rotating shafts. The stretching clamp module further comprises a bending moment loading arm, the rotating shafts are provided with first connectors, the bending moment loading arm is provided with second connectors, and the first connectors and the second connectors are connected in cooperation. The stretching clamp module further comprises a universal joint, and the end of the test piece away from the tenon clamp is connected to a tensile testing machine through the universal joint.

2. The experimental setup for the stretch-bending coupling as claimed in claim 1, wherein, The clamping groove extends to the end position of each of the rotating shafts along the axial extension direction of the rotating shafts.

3. The experimental setup for the stretch-bending coupling as claimed in claim 1, wherein, The cross section shape of the clamping groove on the tenon clamp is one of hammer-shaped, square-shaped and circular-shaped.

4. The experimental setup for the stretch-bending coupling of claim 1, wherein, The first connectors and the second connectors are hexagonal.

5. The experimental setup for the stretch-bending coupling as claimed in claim 1, wherein, The bending moment loading arm comprises a round head end and a square head end; the second connectors are arranged on the round head end, and the square head end is used for connecting with an external loading device.

6. The experimental setup for the stretch-bending coupling as claimed in claim 5, wherein, The number of the bending moment loading arms is two, and the square head end is provided with a connecting component for connecting the bending moment loading arms.

7. The experimental setup for the stretch-bending coupling of claim 1, wherein, The test piece is provided with pads on both sides, the pads are located between the universal joint and the test piece, and the thickness of the pad on one side is different from the thickness of the pad on the other side.

8. A method for testing the coupling of tension and bending, comprising using the testing device according to any one of claims 1-7, and specifically comprising the following steps: S1, moving the upper head and the lower head of the testing machine to a suitable position, so as to facilitate the installation and fixation of the testing machine and the clamp thereof; S2, connecting the connecting component for connecting the bending moment loading arm with an external digital display jack; Turning on the electronic universal testing machine and the digital display jack, starting the testing program, and starting the test.

Images