Dynamic bending fatigue test clamp and system

Abstract

The utility model discloses a dynamic bending fatigue test clamp. The dynamic bending fatigue test clamp comprises a first clamping plate, a second clamping plate, a plurality of first limiting structures arranged on the first clamping plate and a plurality of second limiting structures arranged on the second clamping plate, the first clamping plate and the second clamping plate are rotationally connected, and the first limiting structures and the second limiting structures are arranged in a one-to-one correspondence mode. Each first limiting structure and each corresponding second limiting structure are used for limiting a single sample on the first clamping plate and the second clamping plate and enabling the sample to be arranged in a bent shape. According to the technical scheme provided by the utility model, the fatigue life detection result of the flexible plate is more reliable; and a plurality of flexible plates can be simultaneously placed on each dynamic bending fatigue test fixture for simultaneous detection, so that the service life conditions of a plurality of flexible plates of the same type or different types can be better obtained, the accuracy of a detection result is ensured, and the detection efficiency can be better improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of flexible board test equipment, concretely relates to a dynamic bending fatigue test fixture and system. BACKGROUND

[0002] With the sinking of the electronic consumer market, novel folding screen, flexible screen terminal becomes the new industry consumption hotspot, while driving the development of the flexible circuit board industry, also puts forward new requirements for the bending resistance of the flexible circuit board. The failure of the flexible circuit board in the dynamic bending process is often due to the mechanical fatigue of the copper foil. The current industry mainly uses test methods to study the dynamic bending performance of FPC copper foil. The fixture of the test is very important to obtain accurate test results. Currently, for multiple samples with the same bending radius, and for samples with different bending radii, multiple fixtures with different designs are used, and batches are carried out. However, this process involves errors of different fixtures and personnel operation errors, which affect the test results, so it is urgent to design a fixture to reduce errors and obtain more accurate experimental results. SUMMARY

[0003] In order to solve the above technical problems, the main purpose of the utility model is to provide a dynamic bending fatigue test fixture and system, which aims to solve the problems of large detection error of traditional fatigue life, many error factors in measurement, low detection efficiency and unreliable detection results.

[0004] In order to achieve the above purpose, the utility model provides a dynamic bending fatigue test fixture, which comprises a first clamping plate and a second clamping plate connected in rotation, a plurality of first limiting structures provided on the first clamping plate, and a plurality of second limiting structures provided on the second clamping plate, the plurality of first limiting structures and the plurality of second limiting structures are one-to-one corresponding, each first limiting structure and the corresponding second limiting structure are used to limit a single sample on the first clamping plate and the second clamping plate, and the sample is arranged in a bent state.

[0005] Optionally, the first clamping plate and the second clamping plate are consistent in structure, and are both arranged in a long strip shape, so as to have two long side edges arranged oppositely and two short side edges arranged oppositely, a plurality of first limiting structures are arranged along the extension direction of the long side edge of the first clamping plate, and a plurality of second limiting structures are arranged along the extension direction of the long side edge of the second clamping plate.

[0006] Optionally, one of the long side edges of the first clamping plate is rotatably connected with one of the long side edges of the second clamping plate, the first clamping plate and the second clamping plate are rotatable relative to each other to adjust the bending angle of the sample limited in the corresponding first limiting structure and second limiting structure.

[0007] Optionally, each of the first limiting structures comprises a first limiting groove arranged along the extension direction of the short side of the first clamping plate, and a plurality of the first limiting grooves are arranged at intervals along the extension direction of the long side of the first clamping plate.

[0008] Each of the second limiting structures comprises a second limiting groove arranged along the extension direction of the short side of the second clamping plate, and a plurality of the second limiting grooves are arranged at intervals along the extension direction of the long side of the second clamping plate.

[0009] Each of the first limiting grooves and the corresponding second limiting groove jointly define a containing region for containing a single sample.

[0010] Optionally, the first limiting structure and the second limiting structure each further comprise a plurality of pressing plates, and each of the pressing plates is correspondingly arranged at the opening of each of the first limiting grooves and each of the second limiting grooves.

[0011] Optionally, the depths of the plurality of first limiting grooves are consistent, and the depths of the plurality of second limiting grooves are consistent.

[0012] Optionally, the depths of the plurality of first limiting grooves are inconsistent, the depths of the plurality of second limiting grooves are inconsistent, and the depths of each of the first limiting grooves and the corresponding second limiting groove are consistent.

[0013] Optionally, along the extension direction of the long side of the first clamping plate, the depths of the plurality of first limiting grooves are arranged in an increasing or decreasing manner; and along the extension direction of the long side of the second clamping plate, the depths of the plurality of second limiting grooves are arranged in an increasing or decreasing manner.

[0014] Optionally, the long sides of the first clamping plate and the second clamping plate, which are connected, are each provided with a clearance inclined surface.

[0015] The utility model further provides a dynamic bending fatigue test system, comprising the dynamic bending fatigue test fixture.

[0016] The technical scheme provided by the utility model has the following beneficial effects:

[0017] The dynamic bending fatigue testing fixture provided by this utility model includes a first clamping plate, a second clamping plate, a first limiting structure, and a second limiting structure. The first clamping plate and the second clamping plate are rotatably arranged to adjust the relative angle between them. The sample to be tested (such as a flexible plate) can be placed on the first clamping plate and the second clamping plate, such that one end of the flexible plate is on the first clamping plate and the other end is on the second clamping plate. By rotating the first clamping plate or the second clamping plate, the flexible plate can be bent. Moreover, the first limiting structure and the second limiting structure restrict and fix the flexible plate to the first clamping plate and the second clamping plate, ensuring that the flexible plate will not shift during bending. Furthermore, the bending angle of the flexible plate can be adjusted by adjusting the angle between the first clamping plate and the second clamping plate. The flexible plate can be electrically connected to both sides (i.e., the sides with copper foil) of the test device. By rotating the first or second clamp, the flexible plate is driven to bend repeatedly, and the parameters of the copper foil on both sides of the flexible plate (such as resistance value, stress value, etc.) are acquired in real time to obtain the fatigue life results of the foil on both sides. The corresponding stress curve can be plotted, so as to obtain a more detailed understanding of the life of the flexible plate during the bending process, making the test results more reliable. Moreover, multiple flexible plates can be placed on each dynamic bending fatigue test fixture for simultaneous testing, so as to obtain the life of multiple flexible plates of the same or different types. Since the test conditions of multiple samples are more consistent, the errors caused by different fixtures and different operators during the measurement process can be effectively reduced, which can better ensure the accuracy of the test results and improve the testing efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 An exploded structural diagram of an embodiment of a dynamic bending fatigue testing fixture provided by this utility model;

[0020] Figure 2 for Figure 1 Front view of the first clamping plate;

[0021] Figure 3 An exploded view of another embodiment of the dynamic bending fatigue testing fixture provided by this utility model;

[0022] Figure 4 for Figure 3 Main view and enlarged partial structural diagram of the first clamping plate;

[0023] Figure 5 For Figure 3 The side view of the dynamic bending fatigue test fixture in the exploded state.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 100-dynamic bending fatigue test fixture; 1-first clamping plate; 2-second clamping plate; 3-first limiting structure; 31-first limiting groove; 4-second limiting structure; 41-second limiting groove.

[0026] The realization, functional features and excellent effects of the utility model will be further described below in combination with specific embodiments and drawings. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings of the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0028] It should be noted that if the directionality indication is involved in the embodiments of the utility model, the directionality indication is only used to explain the relative position relationship, movement condition and the like between components in a certain specific posture, and if the specific posture changes, the directionality indication also changes accordingly.

[0029] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the description purpose, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes A scheme, or B scheme, or A and B schemes. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the person skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0030] The utility model provides a kind of dynamic bending fatigue test fixture 100, specifically, please refer to Figure 1 And Figure 3In the embodiment, the dynamic bending fatigue test fixture 100 comprises a first clamping plate 1 and a second clamping plate 2 in a rotary connection, a plurality of first limiting structures 3 arranged on the first clamping plate 1, and a plurality of second limiting structures 4 arranged on the second clamping plate 2, the plurality of first limiting structures 3 and the plurality of second limiting structures 4 are arranged in one-to-one correspondence, each first limiting structure 3 and each corresponding second limiting structure 4 are used to restrict a single sample on the first clamping plate 1 and the second clamping plate 2, and the sample is arranged in a bent shape.

[0031] In the embodiment, the first clamping plate 1 and the second clamping plate 2 are arranged in a rotary manner to adjust the relative angle between the first clamping plate 1 and the second clamping plate 2. The sample to be tested (such as a flexible plate) can be placed on the first clamping plate 1 and the second clamping plate 2, so that one end of the flexible plate is located on the first clamping plate 1 and the other end of the flexible plate is located on the second clamping plate 2. The flexible plate can be bent by rotating the first clamping plate 1 or the second clamping plate 2. Moreover, the first limiting structure 3 and the second limiting structure 4 are used to fix the flexible plate on the first clamping plate 1 and the second clamping plate 2, so as to prevent the flexible plate from moving during the bending process. Moreover, the bending angle of the flexible plate can be adjusted by adjusting the angle between the first clamping plate 1 and the second clamping plate 2. The two sides of the flexible plate (i.e., the two sides provided with copper foil) can be electrically connected to the detection device respectively. By rotating the first clamping plate 1 or the second clamping plate 2, the parameters (such as resistance value and stress value) of the copper foil on both sides of the flexible plate can be obtained in real time during the repeated bending process of the flexible plate. The fatigue life of the copper foil on both sides can be obtained, and the corresponding stress curve can be drawn. Therefore, the life of the flexible plate during the bending process can be obtained more accurately, and the detection result is more reliable. Moreover, a plurality of flexible plates can be placed on each dynamic bending fatigue test fixture 100 for simultaneous detection, so that the life of a plurality of flexible plates of the same type or different types can be obtained more accurately. Since the detection conditions of the plurality of samples are more consistent, the error caused by different fixtures and different operators during the measurement process can be effectively reduced, the accuracy of the detection result can be ensured, and the detection efficiency can be improved.

[0032] The shape and size of the first clamping plate 1 and the second clamping plate 2 are not limited. Preferably, the first clamping plate 1 and the second clamping plate 2 have the same structure and are arranged in a long strip shape, so as to have two long sides arranged in opposition and two short sides arranged in opposition. The first clamping plate 1 and the second clamping plate 2 are substantially flat. The plurality of first limiting structures 3 are arranged along the extension direction of the long side of the first clamping plate 1, and the plurality of second limiting structures 4 are arranged along the extension direction of the long side of the second clamping plate 2. During the fatigue life detection, a plurality of samples can be arranged in sequence along the length direction of the first clamping plate 1 and the second clamping plate 2, so as to be fixed on the dynamic bending fatigue test fixture 100 simultaneously for testing.

[0033] It should be noted that the direction in which the long side of the first clamping plate 1 and the long side of the second clamping plate 2 are located is the length direction of the dynamic bending fatigue test fixture 100, and the direction in which the short side of the first clamping plate 1 and the short side of the second clamping plate 2 are located is the width direction of the dynamic bending fatigue test fixture 100.

[0034] One of the long sides of the first clamping plate 1 is rotatably connected to one of the long sides of the second clamping plate 2, that is, the first clamping plate 1 and the second clamping plate 2 are rotatably connected on one side in the length direction, so that the connection of the first clamping plate 1 and the second clamping plate 2 is more stable, and there is enough space for multiple samples to be placed. By rotating the first clamping plate 1 and the second clamping plate 2 relative to each other, the bending angle of the sample confined in the corresponding first limiting structure 3 and the second limiting structure 4 can be adjusted. By acquiring the detection parameters on the sample in real time during the rotation of the first clamping plate 1 and / or the second clamping plate 2, the stress condition of the sample under each bending angle can be better detected, and when multiple samples of the same type are detected at the same time, the average value of the detection can be obtained, and the multiple detection results can be compared. On the one hand, the accuracy of the detection result can be known, and on the other hand, the most accurate detection result can be better obtained.

[0035] Furthermore, in combination with Figure 5 It is shown that the long side of the first clamping plate 1 and the long side of the second clamping plate 2 connected are provided with a slope, when the angle of the first clamping plate 1 and the second clamping plate 2 is relatively large, the first clamping plate 1 and the second clamping plate 2 will not interfere with each other, and the rotation range is larger.

[0036] Each first limiting structure 3 and corresponding second limiting structure 4 is used to limit and fix the sample on the corresponding first clamping plate 1 and second clamping plate 2, so as to ensure that the sample will not be displaced during detection, and to avoid affecting the accuracy of detection. Among them, the side of the first clamping plate 1 provided with the first limiting structure 3 is the first side, the side of the second clamping plate 2 provided with the second limiting structure 4 is the second side, and the included angle between the first side and the second side forms the included angle between the first clamping plate 1 and the second clamping plate 2.

[0037] Preferably, as Figure 1 and Figure 3As shown in the drawings, each of the first limiting structures 3 comprises a first limiting groove 31 arranged along the extension direction of the short side of the first clamping plate 1, and a plurality of first limiting grooves 31 are arranged at intervals along the extension direction of the long side of the first clamping plate 1, that is, each of the first limiting grooves 31 extends along the width direction of the first clamping plate 1, and a plurality of first limiting grooves 31 are arranged side by side on the first clamping plate 1; each of the second limiting structures 4 comprises a second limiting groove 41 arranged along the extension direction of the short side of the second clamping plate 2, and a plurality of second limiting grooves 41 are arranged at intervals along the extension direction of the long side of the second clamping plate 2, that is, each of the second limiting grooves 41 extends along the width direction of the second clamping plate 2, and a plurality of second limiting grooves 41 are arranged side by side on the second clamping plate 2; preferably, the slot of each of the first limiting grooves 31 is arranged outward from the first side thereof, and the slot of each of the second limiting grooves is arranged outward from the second side thereof, and each of the first limiting grooves 31 and the corresponding second limiting grooves 41 cooperatively define a containing region for containing a single sample, and the two ends of the sample can be clamped in the corresponding first limiting grooves 31 and second limiting grooves 41 respectively, thereby ensuring the position of the sample on the corresponding first clamping plate 1 and second clamping plate 2.

[0038] Further, the first limiting structure 3 and the second limiting structure 4 each further comprise a plurality of pressing plates (not shown in the drawings), and each of the pressing plates corresponds to the slot of each of the first limiting grooves 31 and the slot of each of the second limiting grooves 41. By pressing the sample with a plurality of pressing plates, the sample is prevented from coming out of the first limiting grooves 31 and the second limiting grooves 41, thereby ensuring reliable fixation of the sample, and the sample will not be displaced at any bending angle, thereby ensuring the accuracy and reliability of the detection result.

[0039] Specifically, a plurality of first mounting holes can be provided on the first clamping plate 1 and the second clamping plate 2, a plurality of second mounting holes are provided on each of the pressing plates, and the plurality of first mounting holes and the plurality of first mounting holes are arranged in one-to-one correspondence. By screwing or bolting the corresponding first mounting holes and second mounting holes, the pressing plate can be fixed on the first clamping plate 1 or the second clamping plate 2.

[0040] Further, a plurality of positioning columns can be provided on the first clamping plate 1 and the second clamping plate 2, and a plurality of positioning holes are provided on each of the pressing plates, and the plurality of positioning columns and the plurality of positioning holes are arranged in one-to-one correspondence. By cooperating the plurality of positioning columns and the plurality of positioning holes, the positioning of each of the pressing plates on the first clamping plate 1 or the second clamping plate 2 is more accurate and faster, thereby facilitating the assembly of screws or bolts.

[0041] In another embodiment, each of the pressing plate and the first clamping plate 1 or the second clamping plate 2 can be connected through a buckle structure or a magnetic attraction structure. The fixing mode of the pressing plate is more, which is not described here.

[0042] Moreover, due to the different depths of the first limiting groove 31 and the second limiting groove 41, the bending radii of the corresponding samples are also different when the first clamping plate 1 and the second clamping plate 2 are rotated. The side opposite to the slot of the first limiting groove 31 is the groove bottom, and the depth of the first limiting groove 31 is the distance between the slot and the groove bottom. Similarly, the side opposite to the slot of the second limiting groove 41 is the groove bottom, and the depth of the second limiting groove 41 is the distance between the slot and the groove bottom.

[0043] Therefore, in an embodiment, in combination with Figure 1 and Figure 2 It is shown that the depths of the plurality of first limiting grooves 31 are consistent, and the depths of the plurality of second limiting grooves 41 are consistent, so that the dynamic bending fatigue test fixture 100 can simultaneously detect a plurality of samples under the same detection state, so that the detection conditions of the plurality of samples are consistent, and the accuracy of the sample detection result can be better ensured.

[0044] In another embodiment, the depths of the plurality of first limiting grooves 31 are inconsistent, the depths of the plurality of second limiting grooves 41 are inconsistent, and the depths of each of the first limiting grooves 31 and the corresponding second limiting grooves 41 are consistent. The placement depths of the two ends of each sample are consistent, and a plurality of detection samples can be simultaneously detected under different bending radii, so that the fatigue life detection result of the sample corresponding to the same detection condition when the bending radius is different can be obtained, and the detection result is more diverse.

[0045] Specifically, in combination with Figure 3 and Figure 4 It is shown that in the extension direction along the long side of the first clamping plate 1, the depths of the plurality of first limiting grooves 31 are arranged in an increasing or decreasing manner; in the extension direction along the long side of the second clamping plate 2, the depths of the plurality of second limiting grooves 41 are arranged in an increasing or decreasing manner. Of course, the increasing or decreasing directions of the depths of each limiting groove on the first clamping plate 1 and the second clamping plate 2 are consistent, so as to ensure the consistency of the placement of the two ends of each sample. By regularly arranging the depths, regular detection conclusions can be better obtained.

[0046] In an embodiment, the slot width of the first limiting slot 31 and the slot width of the second limiting slot 41 can also be set to be adjustable, so that the dynamic bending fatigue test fixture 100 can be more suitable for the detection needs of samples of different widths. Alternatively, the slot widths of a plurality of first limiting slots 31 and a plurality of second limiting slots 41 can be set to be increasing or decreasing, so that the fatigue life detection results of samples of different widths can be obtained under the same detection conditions.

[0047] Specifically, a plurality of limiting columns can be arranged in each first limiting slot 31, and the plurality of limiting columns are movably arranged to limit one side of the sample located in the first limiting slot 31. By adjusting the positions of the plurality of limiting columns along the length direction of the first clamping plate 1, the plurality of limiting columns can be limited to samples of different widths. A plurality of limiting columns can also be arranged in the second limiting slot 41, and the principle is similar to the above, which will not be described here.

[0048] The utility model also provides a kind of dynamic bending fatigue test system, which comprises the dynamic bending fatigue test fixture 100 described above, and the dynamic bending fatigue test fixture 100 can ensure the stability and reliability of sample detection, ensure the accuracy of detection results, and significantly improve the detection efficiency of samples. The dynamic bending fatigue test system can also include a bending machine and a finite element simulation program.

[0049] Specifically, taking a flexible board sample as an example, the steps of the dynamic bending fatigue test system for detection are as follows:

[0050] ①After receiving raw materials, a double-sided flexible circuit board with natural symmetry is produced after chemical cleaning, film pressing, exposure, DES and other processes; protective films are attached to both sides of the double-sided flexible board after window opening, film pressing, baking and external cutting, and a laboratory sample finished product is produced;

[0051] ②Finite element modeling simulation is performed on the bending process to find the dynamic bending fatigue test fixture 100 bending angle (about 5-20°) corresponding to the natural or slightly taut state of the sample during loading, and the dynamic bending fatigue test fixture 100 is adjusted to load the sample at the bending angle. After the sample is loaded on the first clamping plate 1 and the second clamping plate 2, the cylindrical foil on both sides of the flexible board is connected to the bending machine connection post through the wire soldering tin, and the line resistance on both sides of the bending is measured in real time. The copper foil resistance rise of 10% is used as the material failure threshold.

[0052] ③ Determine the mean stress effect of the copper foil. Finite element modeling and simulation of the bending process are performed to control the upper and lower stress ranges of the dynamic bending experiment. The bending angle of the dynamic bending fatigue test fixture 100° is found when the stress ranges of the copper layers on both sides are consistent in absolute value. The bending machine is adjusted, and a dynamic bending experiment is conducted at this bending angle. The number of failures on the inner and outer sides of the sample is counted. The data shows that the number of failures of the copper layers on both sides of the double-sided panel is similar, and the outer side subjected to tensile stress fails first. This verifies the mean stress effect of the copper foil, and the fatigue properties of the copper foil can be defined using the stress-life curve.

[0053] ④ Comparative analysis of the effects and differences in adhesive filler processes of different protective films on the fatigue life of copper foil. Symmetrical double-sided panels with protective films from different brands on both sides were used as samples, prepared according to the same procedure in step ①. Dynamic bending tests with the same bending angle were performed on the symmetrical samples prepared in steps ① and ④, and the test results were statistically analyzed. The results showed that the failure life of the samples increased significantly after changing the protective film, thus verifying that differences in adhesive filler formulations between different brands of protective films affect the lifespan of copper foil; and the more filler in the selected protective film model, the greater the impact on the lifespan of the copper foil.

[0054] ⑤ When testing limiting grooves with different depths, specifically, using a bending radius of 0.6mm as the reference plane, the groove depth is increased by 0.2mm for every two sets of samples, corresponding to a 0.2mm increase in bending radius. By progressively increasing the bending radius in this way, the maximum stress level of the copper foil in the dynamic bending test is reduced. A total of five sets of samples can be loaded at once, with bending radii ranging from 0.6mm to 1.4mm, and dynamic bending tests can be conducted simultaneously.

[0055] ⑥ Simulate dynamic bending experiments at different radii to obtain the stress range σ corresponding to different loading groove depths of the bending fixture with multiple bending radii. range (Refers to the difference between the maximum and minimum stress during fatigue loading). A double-sided plate with the same type of low-filler protective film on both sides was selected as the specimen. Following the method in ②, the specimen was loaded according to specifications, and a dynamic bending test was conducted. The fatigue life (N) of the specimen was recorded. f The stress-life curve of the copper foil was plotted based on the results of the fatigue failure cycle count.

[0056] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structure made using the contents of the present utility model specification and drawings, or directly or indirectly applied to other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A dynamic bending fatigue testing fixture, characterized in that, It includes a first clamping plate and a second clamping plate that are rotatably connected, a plurality of first limiting structures disposed on the first clamping plate, and a plurality of second limiting structures disposed on the second clamping plate. The plurality of first limiting structures and the plurality of second limiting structures are arranged in a one-to-one correspondence. Each first limiting structure and each corresponding second limiting structure are used to restrict a single sample on the first clamping plate and the second clamping plate, and to make the sample bend in a bent position.

2. The dynamic bending fatigue testing fixture as described in claim 1, characterized in that, The first clamp and the second clamp have the same structure and are both elongated, with two long sides and two short sides arranged opposite each other. Multiple first limiting structures are arranged at intervals along the extension direction of the long side of the first clamp, and multiple second limiting structures are arranged at intervals along the extension direction of the long side of the second clamp.

3. The dynamic bending fatigue testing fixture as described in claim 2, characterized in that, One of the long sides of the first clamping plate is rotatably connected to one of the long sides of the second clamping plate. The first clamping plate and the second clamping plate rotate relative to each other to adjust the bending angle of the specimen confined within the corresponding first limiting structure and the corresponding second limiting structure.

4. The dynamic bending fatigue testing fixture as described in claim 2, characterized in that, Each of the first limiting structures includes a first limiting groove provided along the extension direction of the short side of the first clamping plate, and a plurality of the first limiting grooves are arranged at intervals along the extension direction of the long side of the first clamping plate. Each of the second limiting structures includes a second limiting groove provided along the extension direction of the short side of the second clamping plate, and a plurality of the second limiting grooves are arranged at intervals along the extension direction of the long side of the second clamping plate. The first limiting groove and the corresponding second limiting groove together define a receiving area for accommodating a single sample.

5. The dynamic bending fatigue testing fixture as described in claim 4, characterized in that, Both the first limiting structure and the second limiting structure include multiple pressure plates, each pressure plate correspondingly covering the opening of the first limiting groove and the opening of the second limiting groove.

6. The dynamic bending fatigue testing fixture as described in claim 4, characterized in that, The depth of the multiple first limiting grooves is the same, and the depth of the multiple second limiting grooves is the same.

7. The dynamic bending fatigue testing fixture as described in claim 4, characterized in that, The depths of the multiple first limiting grooves are not the same, the depths of the multiple second limiting grooves are not the same, and the depths of each first limiting groove and the corresponding second limiting groove are the same.

8. The dynamic bending fatigue testing fixture as described in claim 7, characterized in that, The depths of the plurality of first limiting grooves are arranged in an increasing or decreasing manner along the long side of the first clamping plate; the depths of the plurality of second limiting grooves are arranged in an increasing or decreasing manner along the long side of the second clamping plate.

9. The dynamic bending fatigue testing fixture as described in claim 2, characterized in that, Both the first clamping plate and the second clamping plate have a clearance slope on the long side where they are connected.

10. A dynamic bending fatigue testing system, characterized in that, Includes the dynamic bending fatigue testing fixture as described in any one of claims 1 to 9.

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