Clamping device for bending property test

Abstract

The utility model provides a clamping device for bending performance testing, and the clamping device comprises a first pressing assembly which comprises a plurality of first pressing heads; the second pressing assembly comprises a plurality of second pressing heads, and the first pressing assembly and the second pressing assembly are matched to be used for pressing and clamping the to-be-tested sample; the multiple first pressing heads are arranged on the first supporting part in the first direction, and the first pressing heads can slide relative to the first supporting part in the first direction and can be fixed in position; the second supporting part and the first supporting part are oppositely arranged in the second direction perpendicular to the first direction, the multiple second pressing heads are arranged on the second supporting part in the first direction, and the second pressing heads can slide in the first direction relative to the second supporting part and can be fixed in position. According to the clamping device, the positions of the first pressing head and the second pressing head can be adjusted according to the structure and the shape of the to-be-tested sample, so that the bending performance test of the to-be-tested sample with a large size and a special-shaped complex structure is realized.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of composite material mechanical property testing, in particular to a clamping device for bending property testing. BACKGROUND

[0002] At present, the structural sample for component-level bending property testing of new material and new product is generally spliced or bonded with other components to be tested new product to prepare a component-level structural sample for bending property testing, which can simulate the bending property of new product under working conditions. The traditional test tooling is for testing of conventional plate-shaped standard sample, the measurable sample size is small, the span cannot be adjusted, the neutral plane is uncontrollable, the test process is easy to slip, resulting in deviation of test results, and the bending property testing and evaluation of special-shaped complex structural sample cannot be realized. CONTENT OF THE INVENTION

[0003] In order to solve the above technical problems, the present disclosure provides a clamping device for bending property testing, comprising:

[0004] A first pressing assembly comprising a plurality of first pressing heads;

[0005] A second pressing assembly comprising a plurality of second pressing heads, the first pressing assembly and the second pressing assembly cooperate to press and clamp the sample to be tested;

[0006] A first support portion, a plurality of first pressing heads are arranged on the first support portion along a first direction, the first pressing heads are in sliding cooperation with the first support portion, the first pressing heads can slide along the first direction relative to the first support portion and can be positionally fixed by a first fixing member;

[0007] A second support portion is arranged opposite to the first support portion along a second direction perpendicular to the first direction, a plurality of second pressing heads are arranged on the second support portion along the first direction, the second pressing heads are in sliding cooperation with the second support portion, the second pressing heads can slide along the first direction relative to the second support portion and can be positionally fixed by a second fixing member.

[0008] In some embodiments of the present disclosure, the clamping device further comprises:

[0009] A first adapter portion is arranged on a side of the first support portion away from the first pressing heads, the first adapter portion is used to connect the first support portion with a testing device;

[0010] A second adapter portion is arranged on a side of the second support portion away from the second pressing heads, the second adapter portion is used to connect the second support portion with the testing device.

[0011] In some embodiments of the present disclosure, the clamping device further comprises:

[0012] a first fixed plate arranged between the first adapter and the first support portion, the first adapter being detachably connected with the first fixed plate;

[0013] a second fixed plate arranged between the second adapter and the second support portion, the second adapter being detachably connected with the second fixed plate.

[0014] In some embodiments of the present disclosure, one end of the first pressing head is connected with the first support portion, and the other end of the first pressing head abuts against the sample to be tested during the test; the first pressing head has a first semi-cylindrical surface facing the surface of the sample to be tested, and the axis of the first semi-cylindrical surface extends along a third direction, the third direction, the second direction and the first direction are perpendicular to each other in pairs.

[0015] In some embodiments of the present disclosure, the first pressing head comprises a first seat body and a first pressing portion connected with the first seat body, and the first semi-cylindrical surface is arranged on the first pressing portion, and the first pressing portion can rotate about the axis of the first semi-cylindrical surface as the rotation axis.

[0016] In some embodiments of the present disclosure, the first pressing portion is connected with the first seat body through a plug-in portion, and the plug-in portion is inserted into the first seat body; a rotating shaft is arranged on the middle line of the plug-in portion and the first seat body in the plug-in area, the rotating shaft penetrates the plug-in portion and the first seat body, the plug-in portion can rotate about the axis of the rotating shaft as the rotation axis, and the axis of the rotating shaft is parallel to the first direction.

[0017] In some embodiments of the present disclosure, one end of the second pressing head is connected with the second support portion, and the other end of the second pressing head abuts against the sample to be tested during the test; the second pressing head has a second semi-cylindrical surface facing the surface of the sample to be tested, and the axis of the second semi-cylindrical surface extends along a third direction, the third direction, the second direction and the first direction are perpendicular to each other in pairs.

[0018] In some embodiments of the present disclosure, the second pressing head comprises a second seat body and a second pressing portion connected with the second seat body, and the second semi-cylindrical surface is arranged on the second pressing portion, and the second pressing portion can rotate about the axis of the second semi-cylindrical surface as the rotation axis.

[0019] In some embodiments of the present disclosure, a groove is arranged above the second pressing portion, and the length of the groove in the third direction is greater than or equal to the width of the sample to be tested.

[0020] In some embodiments of the present disclosure, the first support part and the second support part are provided with length scale mark structures on the side surfaces thereof.

[0021] The present disclosure has at least the following effects:

[0022] The first pressing assembly and the second pressing assembly in the clamping device for bending performance test provided by the present disclosure can press and clamp the sample to be tested in cooperation, the first pressing head in the first pressing assembly can slide relative to the first support part, and the second pressing head in the second pressing assembly can slide relative to the second support part, so that the positions of the first pressing head and the second pressing head can be adjusted according to the structure and shape of the sample to be tested, thereby realizing the bending performance test of the sample to be tested with large size and complex special-shaped structure. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative effort.

[0024] Figure 1 The structure diagram of the clamping device for bending performance test in an exemplary embodiment of the present disclosure.

[0025] In the drawings:

[0026] 10 - first pressing assembly; 11 - first pressing head; 12 - first seat body; 13 - first pressing part; 14 - rotating shaft; 20 - second pressing assembly; 21 - second pressing head; 22 - second seat body; 23 - second pressing part; 30 - first support part; 40 - second support part; 50 - sample to be tested; 60 - plug-in part; 71 - first adapter part; 72 - second adapter part; 81 - first fixed plate; 82 - second fixed plate; 100 - clamping device. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present disclosure will be described clearly and completely in combination with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only some embodiments of the present disclosure, not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present disclosure.

[0028] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the disclosure. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated in a combination of embodiments.

[0029] The conventional test tool for testing the bending performance of a new material is for testing a regular plate-shaped standard sample, the sample size to be measured is small, the span cannot be adjusted, the centering is uncontrollable, and the bending performance test and evaluation of a sample of a special-shaped complex structure cannot be achieved.

[0030] To solve the problems in the related art, the disclosure provides a clamping device for bending performance test, the first pressing assembly and the second pressing assembly in the clamping device can press and clamp a sample to be tested in cooperation, the first pressing head in the first pressing assembly can slide relative to the first support part, the second pressing head in the second pressing assembly can slide relative to the second support part, so the positions of the first pressing head and the second pressing head can be adjusted according to the structure and shape of the sample to be tested, thereby realizing the bending performance test of a large-size and special-shaped complex structure sample to be tested.

[0031] The embodiment of the disclosure provides a clamping device for bending performance test, as shown in Figure 1 The clamping device 100 includes a first pressing assembly 10, a second pressing assembly 20, a first support part 30 and a second support part 40. The first pressing assembly 10 includes a plurality of first pressing heads 11 (for example, the number of first pressing heads 11 shown in Figure 1 may be 2), the second pressing assembly 20 includes a plurality of second pressing heads 21 (for example, the number of second pressing heads 21 shown in Figure 1 may be 2), the first pressing assembly 10 and the second pressing assembly 20 cooperate to press and clamp a sample to be tested 50. The plurality of first pressing heads 11 are arranged in a first direction on the first support part 30, for example, the x direction in Figure 1 , the first pressing head 11 is in sliding cooperation with the first support part 30, the first pressing head 11 can slide relative to the first support part 30 in the first direction and can be positionally fixed by a first fixing member. The second support part 40 is oppositely arranged with the first support part 30 in a second direction perpendicular to the first direction, for example, the z direction in Figure 1 , the plurality of second pressing heads 21 are arranged in the first direction on the second support part 40, the second pressing head 21 is in sliding cooperation with the second support part 40, the second pressing head 21 can slide relative to the second support part 40 in the first direction and can be positionally fixed by a second fixing member.

[0032] In this embodiment, the first pressing component 10 and the second pressing component 20 in the clamping device 100 can cooperate to press and clamp the test sample 50. The first pressing head 11 in the first pressing component 10 can slide relative to the first support part 30, and the second pressing head 21 in the second pressing component 20 can slide relative to the second support part 40. Therefore, the positions of the first pressing head 11 and the second pressing head 21 can be adjusted according to the structure and shape of the test sample 50, thereby realizing the bending performance test of the large-sized and irregularly shaped complex structure test sample 50.

[0033] For example, the clamping device 100 provided in this embodiment can test the bending performance of a test sample 50 with dimensions of length (0.5-2m) * width (0.05-0.15m) * thickness (0.06-0.1m).

[0034] For example, the first and second fixing members can be bolts. For instance, after adjusting the sliding position of the first pressing head 11 on the first support 30 and the sliding position of the second pressing head 21 on the second support 40 according to the structure and shape of the sample to be tested, the first pressing head 11 and the second pressing head 21 are fixed by bolts.

[0035] For example, the first support 30 and the second support 40 can be lightweight, high-strength structures spliced ​​together from lightweight aluminum profile square tubes. Their overall weight is light, which will not excessively increase the weight of the testing device and cause testing errors in the bending performance of the test sample 50, and they are easy to lift and install.

[0036] For example, in this embodiment, all components can be connected by bolts to facilitate disassembly, assembly, and transportation.

[0037] In one embodiment, such as Figure 1 As shown, the clamping device also includes a first adapter 71 and a second adapter 72. The first adapter 71 is disposed on the side of the first support 30 opposite to the first pressing head 11, and is used to connect the first support 30 to the testing device. The second adapter 72 is disposed on the side of the second support 40 opposite to the second pressing head 21, and is used to connect the second support 40 to the testing device.

[0038] In the embodiment, the first adapter 71 and the second adapter 72 are respectively used to connect the first support 30 and the second support 40 with the testing device. The first adapter 71 and the second adapter 72 are respectively detachably connected with the first support 30 and the second support 40, so that the first adapter 71 and the second adapter 72 can be replaced according to different testing devices connected with the clamping device 100, so as to realize that the clamping device 100 is adaptable to testing devices with various bending properties, such as a bending property fatigue testing machine and a static testing machine. Exemplarily, the first adapter 71 and the second adapter 72 can be high-strength steel adapters.

[0039] In an embodiment, as shown in Figure 1 The clamping device further includes a first fixed plate 81 and a second fixed plate 82. The first fixed plate 81 is arranged between the first adapter 71 and the first support 30, and the first adapter 71 is detachably connected with the first fixed plate 81. The second fixed plate 82 is arranged between the second adapter 72 and the second support 40, and the second adapter 72 is detachably connected with the second fixed plate 82.

[0040] In the embodiment, the first fixed plate 81 can be fixedly connected to a side of the first support 30 away from the first pressing head 11, and the second fixed plate 82 can be fixedly connected to a side of the second support 40 away from the second pressing head 21. The first fixed plate 81 and the second fixed plate 82 can be reinforced high-strength steel plates, so as to improve the bending strength of the first support 30 and the second support 40. The thickness of the first fixed plate 81 and the second fixed plate 82 is set to be not more than 3 mm, so that the first fixed plate 81 and the second fixed plate 82 are relatively light in weight and do not excessively increase the weight of the clamping device 100 to cause a bending property testing error, and the clamping device 100 is convenient to lift and install. The first adapter 71 is detachably connected to the first fixed plate 81, and the second adapter 72 is detachably connected to the second fixed plate 82, so as to facilitate replacement of the first adapter 71 and the second adapter 72 when the clamping device 100 is applied to different testing devices.

[0041] In an embodiment, as shown in Figure 1 One end of the first pressing head 11 is connected with the first support 30, and the other end of the first pressing head 11 abuts against the sample 50 to be tested during the testing process. The surface of the first pressing head 11 facing the sample 50 to be tested is a first semi-cylindrical surface, and the axis of the first semi-cylindrical surface extends along a third direction. The third direction is, for example, the y direction in Figure 1 The third direction, the second direction, and the first direction are perpendicular to each other in pairs.

[0042] In the embodiment, the surface of the first pressing head 11 abutting against the sample 50 during the test is a first semi-cylindrical surface, which is beneficial to keep the contact area between the first pressing head 11 and the sample 50 unchanged after the sample 50 is bent and deformed under the load during the test, thereby avoiding the load change of the sample 50 during the test, and affecting the test result of the bending performance of the sample 50.

[0043] In an embodiment, as shown in Figure 1 the first pressing head 11 comprises a first seat body 12 and a first pressing part 13 connected with the first seat body 12, and the first semi-cylindrical surface is arranged on the first pressing part 13, and the first pressing part 13 can rotate around the axis of the first semi-cylindrical surface as the rotation axis.

[0044] In the embodiment, the surface of the first pressing head 11 abutting against the sample 50 during the test is a first semi-cylindrical surface, which is arranged on the first pressing part 13, and after the sample 50 is bent and deformed under the load during the test, the first pressing part 13 can rotate around the axis of the first semi-cylindrical surface as the rotation axis along the direction of the bending of the sample 50, so that the first pressing part 13 can still fit the surface of the sample 50, and the test process can continue to run smoothly.

[0045] In an embodiment, as shown in Figure 1 the first pressing part 13 is connected with the first seat body 12 through a plug-in part 60, and the plug-in part 60 is inserted into the first seat body 12. A rotation shaft 14 is arranged on the middle line of the plug-in part 60 and the first seat body 12, and the rotation shaft 14 penetrates the plug-in part 60 and the first seat body 12. The plug-in part 60 can rotate around the axis of the rotation shaft 14 as the rotation axis, and the axis of the rotation shaft 14 is parallel to the first direction.

[0046] In the embodiment, the plug-in part 60 can rotate around the axis of the rotation shaft 14 as the rotation axis, so when the surface of the sample 50 abutting against the first pressing part 13 is an uneven surface, the plug-in part 60 can rotate along the direction of the concave part of the sample 50, so that the first pressing part 13 can fit the surface of the sample 50 to the greatest extent, and the gap between the sample 50 and the first pressing part 13 caused by the uneven surface of the sample 50 is avoided, so that the stress of the sample 50 is more uniform, and the error caused by the uneven stress during the test is avoided.

[0047] In an embodiment, as shown in Figure 1As shown, one end of the second pressing head 21 is connected with the second supporting part 40, and the other end of the second pressing head 21 abuts against the sample 50 to be tested during the test; the surface of the second pressing head 21 facing the sample 50 to be tested is a second semi-cylindrical surface, and the axis of the second semi-cylindrical surface extends along a third direction, the third direction, the second direction and the first direction are perpendicular to each other in pairs.

[0048] In this embodiment, the surface of the second pressing head 21 abutting against the sample 50 to be tested during the test is a second semi-cylindrical surface, which is beneficial to keeping the contact area between the second pressing head 21 and the sample 50 to be tested unchanged after the sample 50 to be tested is bent and deformed by the load during the test, thereby avoiding the load change of the sample 50 to be tested during the test, and affecting the test result of the bending performance of the sample 50 to be tested.

[0049] In one embodiment, as shown in Figure 1 The second pressing head 21 includes a second seat body 22 and a second pressing part 23 connected with the second seat body 22, and the second semi-cylindrical surface is arranged on the second pressing part 23, and the second pressing part 23 can rotate about the axis of the second semi-cylindrical surface as a rotation axis.

[0050] In this embodiment, the surface of the second pressing head 21 abutting against the sample 50 to be tested during the test is a second semi-cylindrical surface, and the second semi-cylindrical surface is arranged on the second pressing part 23. After the sample 50 to be tested is bent and deformed by the load during the test, the second pressing part 23 can rotate about the axis of the second semi-cylindrical surface as a rotation axis, and rotate along the bending direction of the sample 50 to be tested, so that the second pressing part 23 can still fit the surface of the sample 50 to be tested, and ensure the continuous and stable operation of the test process.

[0051] In one embodiment, as shown in Figure 1 The upper side of the second pressing part 23 is provided with a groove, and the length of the groove in the third direction is greater than or equal to the width of the sample 50 to be tested.

[0052] In this embodiment, the groove with a length greater than or equal to the width of the sample 50 to be tested is arranged above the second pressing part 23 in the third direction, which can avoid the displacement of the sample 50 to be tested in the third direction when the sample 50 to be tested is subjected to the load pressure during the test, and affect the test precision of the bending performance of the sample 50 to be tested.

[0053] Exemplarily, the second pressing part 23 can be connected with the second seat body 22 through a cylindrical pin, so as to replace the second pressing part 23 with different lengths of grooves according to different widths of the sample 50 to be tested.

[0054] In an embodiment, length scale mark structures are provided on the side surfaces of the first support part 30 and the second support part 40, which facilitate adjustment of the sliding positions of the first pressing head 11 relative to the first support part 30 and the sliding positions of the second pressing head 21 relative to the second support part 40, so as to ensure the centration of the clamping position of the sample 50 to be tested and improve the test precision of the bending performance of the sample 50 to be tested.

[0055] Exemplarily, the length scale mark structures provided on the side surfaces of the first support part 30 and the second support part 40 can be scale schematic lines printed by laser.

[0056] In order to more clearly explain the technical solutions of the present disclosure, the following will be described in combination with Figure 1 As shown in the figure, the following will give a specific example of the application of the clamping device for bending performance test provided by the embodiment of the present disclosure to the bending performance test.

[0057] The first support part 30 and the second support part 40 are respectively connected and installed with the bending performance test tester through the first adapter 71 and the second adapter 72.

[0058] According to the size of the sample 50 to be tested and the upper and lower span test requirements of the test, the first pressing head 11 and the second pressing head 21 are accurately adjusted to the specified positions according to the scales on the side surfaces of the first support part 30 and the second support part 40, and are respectively fixed in position by the first fixing part and the second fixing part.

[0059] The sample 50 to be tested is fixed in the groove of the second pressing part 23, and the centration of the sample 50 to be tested is ensured according to the scale on the side surface of the second support part 40.

[0060] According to the loading speed and the loading mode required by the test, the bending performance test tester drives the first support part 30 to move towards the second support part 40, or drives the second support part 40 to move towards the first support part 30, until the sample 50 to be tested is broken and fails, i.e. the test is completed. During the test, the center position of the sample 50 to be tested can be measured by the displacement sensor to obtain the maximum stroke of the sample 50 to be tested, and then the difference between the maximum deformation value and the deformation value at the beginning of the test (i.e. when the first pressing head 11 just contacts the sample 50 to be tested) is the total deformation value of the sample 50 to be tested. The state when the first pressing head 11 just contacts the sample 50 to be tested is set as the initial point of the test start, and the bending performance test tester simultaneously records the time, displacement and force value at the beginning of the test. When the sample 50 to be tested is broken or reaches the target displacement, i.e. the test is completed, the recording of the time, displacement and force value parameters is stopped, and the parameters are displayed on the display of the bending performance test tester. Then the bending strength and modulus of the sample 50 to be tested are calculated.

[0061] In the specific example, the clamping device for bending performance test provided by the embodiments of the present disclosure is applied to the bending performance test, the first pressing head 11 in the first pressing assembly 10 can slide relative to the first support part 30, and the second pressing head 21 in the second pressing assembly 20 can slide relative to the second support part 40, so that the positions of the first pressing head 11 and the second pressing head 21 can be adjusted according to the structure and shape of the sample 50 to be tested, thereby realizing the bending performance test of the sample 50 to be tested with large size and complex structure.

[0062] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0063] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A clamping device for bend performance testing, characterized in that, The application relates to a clamping device for clamping a sample to be tested, comprising: a first pressing assembly comprising a plurality of first pressing heads; a second pressing assembly comprising a plurality of second pressing heads, the first pressing assembly and the second pressing assembly being matched to press and clamp the sample to be tested; a first supporting part, the first pressing heads being arranged along a first direction on the first supporting part, the first pressing heads being in sliding fit with the first supporting part, the first pressing heads being capable of sliding along the first direction relative to the first supporting part and being capable of being positionally fixed by a first fixing member; a second supporting part, the second pressing heads being arranged along the first direction on the second supporting part, the second pressing heads being in sliding fit with the second supporting part, the second pressing heads being capable of sliding along the first direction relative to the second supporting part and being capable of being positionally fixed by a second fixing member, the second supporting part being oppositely arranged to the first supporting part along a second direction perpendicular to the first direction.

2. The clamping device for bend performance testing according to claim 1, characterized in that, The clamping device further comprises: a first adapter part arranged on a side of the first supporting part away from the first pressing heads, the first adapter part being used to connect the first supporting part with a testing device; a second adapter part arranged on a side of the second supporting part away from the second pressing heads, the second adapter part being used to connect the second supporting part with the testing device.

3. The clamping device for bend performance testing of claim 2, wherein, The clamping device further comprises: a first fixing plate arranged between the first adapter part and the first supporting part, the first adapter part being detachably connected with the first fixing plate; a second fixing plate arranged between the second adapter part and the second supporting part, the second adapter part being detachably connected with the second fixing plate.

4. The clamping device for bend performance testing of claim 1, wherein, One end of the first pressing head is connected with the first supporting part, and the other end of the first pressing head abuts against the sample to be tested during testing; the surface of the first pressing head facing the sample to be tested is a first semi-cylindrical surface, the axis of the first semi-cylindrical surface extending along a third direction, the third direction, the second direction and the first direction being perpendicular to each other in pairs.

5. The clamping device for bend performance testing of claim 4, wherein, The first pressing head comprises a first seat body and a first pressing part connected with the first seat body, the first semi-cylindrical surface being arranged on the first pressing part, the first pressing part being capable of rotating about the axis of the first semi-cylindrical surface as a rotating axis.

6. The clamping device for bend performance testing of claim 5, wherein, The first pressing part is connected with the first seat body through a plug-in part, the plug-in part being inserted into the first seat body; a rotating shaft is arranged on the middle line of the plug-in part and the first seat body in the plug-in fit overlapping area, the rotating shaft penetrating through the plug-in part and the first seat body, the plug-in part being capable of rotating about the axis of the rotating shaft as a rotating axis, the axis of the rotating shaft being parallel to the first direction.

7. The clamping device for bend performance testing of claim 1, wherein, One end of the second pressing head is connected with the second supporting part, and the other end of the second pressing head abuts against the sample to be tested during testing; the surface of the second pressing head facing the sample to be tested is a second semi-cylindrical surface, the axis of the second semi-cylindrical surface extending along a third direction, the third direction, the second direction and the first direction being perpendicular to each other in pairs.

8. The clamping device for bend performance testing of claim 7, wherein, The second pressing head comprises a second seat body and a second pressing portion connected with the second seat body, the second semi-cylindrical surface is arranged on the second pressing portion, and the second pressing portion can rotate with the axis of the second semi-cylindrical surface as a rotation axis.

9. The clamping device for bend performance testing of claim 8, wherein, A groove is arranged above the second pressing portion, and the length of the groove in the third direction is greater than or equal to the width of the sample to be tested.

10. The clamping device for bend performance testing of claim 1, wherein, Length scale mark structures are arranged on the side surfaces of the first support portion and the second support portion.

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