Picture frame test apparatus for flexible fabric in-plane shear deformation evaluation

Abstract

The present application relates to the flexible fabric in-plane shear deformation evaluation of the photo frame test device.The present application belongs to the model test device technical field of the in-plane shear deformation process of the fabric due to the yarn stress in the process of the flexible fabric ballistic penetration;The photo frame test device comprises a test photo frame, the test photo frame is in a rectangular frame structure, and a test assembly is arranged on the test photo frame;In order to realize the purpose of directly observing the in-plane shear deformation of the flexible fabric by naked eyes, a test assembly is arranged on the test photo frame;When the flexible fabric is fixed above the sliding block through the fixing assembly, the flexible fabric will be deformed when impacted by external force, and the sliding block will move when the flexible fabric is deformed;When the sliding block moves, the block-shaped pencil core slides on the surface of the test photo frame to form an indicating line;By observing the length of the indicating line, the in-plane shear deformation of the flexible fabric can be directly observed by naked eyes.

Description

Technical Field

[0001] The invention belongs to the technical field of modeling test devices for shear deformation of flexible fabrics due to yarn force during ballistic penetration, and particularly relates to a frame test device for evaluating shear deformation of flexible fabrics. Background Art

[0002] Aramid fiber fabrics are widely used in the field of bulletproof equipment preparation due to their high modulus, high strength, high temperature resistance, corrosion resistance and other advantages. However, the ballistic penetration performance measurement experimental process of bulletproof equipment occurs too quickly and can only macroscopically evaluate its anti-ballistic performance. There is no way to classify and quantitatively analyze the mechanical response of the fabric.

[0003] In the invention patent entitled "Photo Frame Testing Device and Testing Method for Evaluating In-Plane Shear Deformation of Flexible Fabrics" (patent application number: CN201810279052.5), a shear stress-shear strain conversion method is used to more specifically evaluate the in-plane shear deformation resistance of flexible fabrics. However, the calculation method is complex and the amount of in-plane shear deformation of the flexible fabric cannot be directly and quantitatively determined by the naked eye.

[0004] Therefore, a photo frame testing device for evaluating the in-plane shear deformation of flexible fabrics is proposed to solve the above-mentioned drawbacks. Summary of the Invention

[0005] The purpose of the present invention is to provide a photo frame testing device with a simple structure and reasonable design in order to solve the above problems.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] A frame testing device for evaluating in-plane shear deformation of flexible fabric includes a test frame having a rectangular frame structure. The test frame is provided with a test assembly, the test assembly including a sliding block slidably arranged on the surface of the test frame and an indicator line arranged on the upper surface of the test frame. The lower surface of the sliding block is provided with a block-shaped pencil lead. A fixing assembly for fixing the flexible fabric is provided above the sliding block. The fixing assembly fixes the flexible fabric to the test frame, with the flexible fabric shielded on one side of the rectangular frame structure. When the flexible fabric is impacted by an external force, the sliding block is driven to slide along the surface of the test frame. The block-shaped pencil lead on the lower surface of the sliding block slides on the upper surface of the test frame to form an indicator line. The amount of in-plane shear deformation of the flexible fabric is obtained by the length of the indicator line.

[0008] As a further optimization scheme of the present invention, a positioning plate is fixedly provided on the inner wall of the rectangular frame, a second magnetic block is fixedly provided on the upper end of the positioning plate, and a first magnetic block is fixedly connected to the upper end of the sliding block, and the first magnetic block and the second magnetic block repel each other.

[0009] In order to achieve the purpose of being able to directly observe the shear deformation of the flexible fabric surface with the naked eye, the present invention provides a test component on the test frame. When the flexible fabric is fixed above the sliding block by the fixing component, the flexible fabric will be deformed when an external force impacts the flexible fabric, and the deformation of the flexible fabric will pull the sliding block to move. When the sliding block moves, the block-shaped pencil lead slides on the surface of the test frame to form an indicator line. By observing the length of the indicator line, the amount of shear deformation of the flexible fabric surface can be directly observed with the naked eye.

[0010] Furthermore, the second magnetic block repels the first magnetic block, and when the sliding block moves on the upper surface of the test frame, there is resistance formed between the second magnetic block and the first magnetic block, so that the sliding block does not move over a large range when moving on the upper surface of the test frame, which facilitates the determination of the amount of shear deformation in the surface of the flexible fabric through observation over a limited length. The resistance between the first magnetic block and the second magnetic block can be determined through limited experiments and will not be elaborated here.

[0011] As a further optimization scheme of the present invention, a sliding groove is provided on the upper surface of the test photo frame, a sliding bracket is slidably provided in the sliding groove, the upper end of the sliding bracket extends above the test photo frame, and a third magnetic block is fixedly provided on the end of the sliding bracket extending above the test photo frame, and an eraser is provided below the third magnetic block.

[0012] Furthermore, the eraser is used to erase the indicator line drawn on the surface of the test frame when the block pencil lead slides, which is convenient for next use and has strong practicality.

[0013] As a further optimization solution of the present invention, a second spring is fixedly provided on the lower surface of the third magnetic block, a movable support plate is fixedly provided on the lower end of the second spring, and the lower surface of the movable support plate is bonded and fixed to the eraser.

[0014] The eraser can be pressed against the surface of the test frame in real time by the force of the movable support plate pushed by the second spring, thereby ensuring that the eraser can still be used to erase the indicator line after being worn out.

[0015] As a further optimization scheme of the present invention, an indicator line is provided on the upper surface of the test photo frame, and the indicator line is distributed along the length direction of the sliding groove. The third magnetic block and the first magnetic block repel each other, and an internal groove is provided on the side of the sliding groove away from the positioning plate. The end of the internal groove away from the sliding groove is fixedly connected to a third spring that pulls the sliding bracket to move toward the sliding block position.

[0016] Furthermore, the third magnetic block repels the first magnetic block, causing the eraser to initially be located on a side away from the block-shaped pencil lead. When the flexible fabric above the sliding block and the first magnetic block are removed, the fixing screw loses its repulsive effect. At this time, the third spring pulls the sliding bracket toward the sliding block, and the eraser can move along the indicator line to automatically erase the indicator line on the surface of the test frame without the need for manual erasing, thereby avoiding the phenomenon of wasting time when erasing many indicator lines when multiple sets of test components are set up simultaneously.

[0017] As a further optimization solution of the present invention, an external support frame is fixedly welded to the outer wall of the rectangular frame structure, and a telescopic rod for holding the sliding block is fixedly provided on the external support frame.

[0018] The telescopic rod is a common telescopic rod, which is used to provide a guide for the sliding block when it slides.

[0019] As a further optimization solution of the present invention, a first spring is provided on the lower surface of the sliding block, a telescopic hole is fixedly provided on the inner wall of the upper end of the first spring, and the lower end of the telescopic hole is bonded and fixed to the block-shaped pencil lead.

[0020] The telescopic hole can elevate the block pencil lead to always adhere to the surface of the test frame, thereby avoiding the phenomenon that the block pencil lead cannot be used up once and then cannot draw an indicator line on the surface of the test frame.

[0021] As a further optimization scheme of the present invention, the fixing component includes a fixing screw, and a threaded hole is provided on the upper surface of the sliding block. The upper end of the threaded hole passes through the upper and lower surfaces of the first magnetic block at the same time. The threaded hole corresponds to the fixing screw, and the fixing screw includes a screw part and a nut part. The screw part and the threaded hole are connected by threaded cooperation, and the nut part is integrally arranged at the upper end of the screw part.

[0022] The screw part is connected to the threaded hole through threaded fitting, and the nut part presses and fixes the edges and corners of the flexible fabric to achieve fixation of the flexible fabric.

[0023] Furthermore, when the fixing screw rotates in the threaded hole and loosens the flexible fabric, the flexible fabric can be removed, making it convenient to first observe the indicator line on the surface of the test frame. When the fixing screw is completely removed from the threaded hole, the first magnetic block can be removed from above the sliding block. At this time, the third magnetic block loses its repulsive effect and uses the pulling force of the third spring to approach one side of the sliding block. When the third magnetic block approaches the sliding block, the indicator line is automatically erased by the eraser.

[0024] As a further optimization solution of the present invention, a raised tooth is fixedly provided on the lower surface of the nut portion, and a plurality of raised teeth are provided, and the plurality of raised teeth are distributed at equal distances.

[0025] The raised teeth on the lower surface of the nut portion allow the flexible fabric to be stably fixed between the nut portion and the first magnetic block, and it is unlikely that the flexible fabric will slip out from between the first magnetic block and the nut portion.

[0026] As a further optimization solution of the present invention, the test components are provided in multiple groups, and the multiple groups of test components are distributed at equal distances along the surface of the rectangular frame structure, and fixing holes are provided at the four corners of the rectangular frame structure.

[0027] When multiple test components are provided, the periphery of the flexible fabric can be fixed at equal distances to facilitate observation of the amount of internal shear deformation of the flexible fabric in multiple directions.

[0028] The beneficial effects of the present invention are as follows: the present invention includes a test frame, the test frame has a rectangular frame structure, a test assembly is provided on the test frame, the test assembly includes a sliding block slidably provided on the surface of the test frame and an indicator line provided on the upper surface of the test frame, the lower surface of the sliding block is provided with a block-shaped pencil lead, and in order to achieve the purpose of being able to directly observe the shear deformation amount of the flexible fabric surface by the naked eye, the present invention is provided with the test assembly on the test frame, when the flexible fabric is fixed above the sliding block by the fixing assembly, the external force impacting the flexible fabric will cause the flexible fabric to deform, and when the flexible fabric is deformed, it will pull the sliding block to move, and when the sliding block moves, the block-shaped pencil lead slides on the surface of the test frame to form an indicator line, and by observing the length of the indicator line, the amount of the shear deformation of the flexible fabric surface can be directly observed by the naked eye.

[0029] In the present invention, the second magnetic block and the first magnetic block repel each other. When the sliding block moves on the upper surface of the test frame, there is resistance formed between the second magnetic block and the first magnetic block, so that the sliding block does not move over a large range when moving on the upper surface of the test frame, making it convenient to obtain the amount of shear deformation in the surface of the flexible fabric through observation over a limited length.

[0030] The eraser of the invention is used for erasing the indicator line drawn on the surface of the test frame when the block-shaped pencil lead slides, which is convenient for next use and has strong practicality.

[0031] In the present invention, the eraser can be adhered to the surface of the test frame in real time by the force of the second spring pushing the movable support plate, ensuring that the eraser can still be used to erase the indicator line after being worn out.

[0032] In the present invention, the third magnetic block and the first magnetic block repel each other, so that the initial position of the eraser is located on the side away from the block-shaped pencil lead. When the flexible fabric above the sliding block and the first magnetic block are removed, the fixing screw loses its repulsive effect. At this time, the third spring pulls the sliding bracket toward the sliding block, and the eraser can move along the indicator line to automatically erase the indicator line on the surface of the test frame. Manual erasing is unnecessary, avoiding the time-consuming process of erasing many indicator lines when multiple test components are installed simultaneously.

[0033] In the present invention, when multiple groups of test components are provided, the periphery of the flexible fabric can be fixed at equal distances, so as to facilitate observation of the amount of internal shear deformation of the flexible fabric in multiple directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic structural diagram of a photo frame testing device for evaluating in-plane shear deformation of flexible fabrics according to the present invention;

[0035] Figure 2 A top view of a photo frame testing device for evaluating in-plane shear deformation of a flexible fabric according to the present invention;

[0036] Figure 3 A front view of a picture frame testing device for evaluating in-plane shear deformation of a flexible fabric according to the present invention;

[0037] Figure 4 A cross-sectional view of a picture frame test device for evaluating in-plane shear deformation of a flexible fabric according to the present invention;

[0038] Figure 5 A sectional view of the three-dimensional structure of a photo frame testing device for evaluating the in-plane shear deformation of a flexible fabric according to the present invention;

[0039] Figure 6 For the present invention Figure 4 A schematic diagram of the structure at center A;

[0040] Figure 7 For the present invention Figure 5 A magnified schematic diagram of the structure at point B in the middle;

[0041] Figure 8 It is a schematic diagram of the fixing screw structure of the present invention.

[0042] In the figure: 1. Test frame; 2. Test assembly; 3. Fixing hole; 4. Sliding groove; 5. Eraser; 6. Flexible fabric; 7. Fixing screw; 8. Telescopic hole; 9. First spring; 10. Block pencil lead; 11. First magnetic block; 12. Sliding block; 13. Internal groove; 14. Third spring; 15. Movable support plate; 16. Second spring; 17. Third magnetic block; 18. Sliding bracket; 19. Positioning plate; 20. Second magnetic block; 21. Indicator line; 22. Telescopic rod; 23. External support frame; 24. Screw part; 25. Nut part; 26. Raised teeth; 27. Threaded hole. DETAILED DESCRIPTION

[0043] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0044] like Figures 1 to 8 As shown, a photo frame testing device for evaluating in-plane shear deformation of a flexible fabric includes a test frame 1 having a rectangular frame structure. A test assembly 2 is provided on the test frame 1. The test assembly 2 includes a sliding block 12 slidably provided on the surface of the test frame 1 and an indicator line 21 provided on the upper surface of the test frame 1. A block-shaped pencil lead 10 is provided on the lower surface of the sliding block 12. A fixing assembly for fixing a flexible fabric 6 is provided above the sliding block 12. The fixing assembly fixes the flexible fabric 6 to the test frame 1. The flexible fabric 6 is shielded on one side of the rectangular frame structure. When the flexible fabric 6 is impacted by an external force, it drives the sliding block 12 to slide along the surface of the test frame 1. The block-shaped pencil lead 10 on the lower surface of the sliding block 12 slides on the upper surface of the test frame 1 to form an indicator line. The amount of in-plane shear deformation of the flexible fabric 6 is obtained by the length of the indicator line.

[0045] A positioning plate 19 is fixedly provided on the inner wall of the rectangular frame. A second magnetic block 20 is fixedly provided on the upper end of the positioning plate 19. The upper end of the sliding block 12 is fixedly connected to the first magnetic block 11. The first magnetic block 11 and the second magnetic block 20 repel each other.

[0046] In order to achieve the purpose of being able to directly observe the in-plane shear deformation of the flexible fabric 6 with the naked eye, the present invention provides a test assembly 2 on the test frame 1. When the flexible fabric 6 is fixed above the sliding block 12 by the fixing assembly, the flexible fabric 6 is deformed when an external force impacts the flexible fabric 6. When the flexible fabric 6 is deformed, the sliding block 12 is pulled to move. When the sliding block 12 moves, the block-shaped pencil lead 10 slides on the surface of the test frame 1 to form an indicator line. By observing the length of the indicator line, the in-plane shear deformation of the flexible fabric 6 can be directly observed with the naked eye.

[0047] Furthermore, the second magnetic block 20 repels the first magnetic block 11. When the sliding block 12 moves on the upper surface of the test frame 1, there is resistance formed between the second magnetic block 20 and the first magnetic block 11, so that the sliding block 12 does not move over a large range when moving on the upper surface of the test frame 1, which facilitates the determination of the amount of shear deformation of the flexible fabric 6 in the plane through observation over a limited length. The resistance between the first magnetic block 11 and the second magnetic block 20 can be determined through limited experiments and will not be elaborated here.

[0048] A sliding groove 4 is provided on the upper surface of the test photo frame 1, and a sliding bracket 18 is slidably provided in the sliding groove 4. The upper end of the sliding bracket 18 extends above the test photo frame 1, and a third magnetic block 17 is fixedly provided at the end of the sliding bracket 18 extending above the test photo frame 1, and an eraser 5 is provided below the third magnetic block 17.

[0049] Furthermore, the eraser 5 is used to erase the indicator line drawn on the surface of the test frame 1 when the block-shaped pencil lead 10 slides, which is convenient for next use and has strong practicality.

[0050] A second spring 16 is fixedly provided on the lower surface of the third magnetic block 17 , a movable support plate 15 is fixedly provided on the lower end of the second spring 16 , and the lower surface of the movable support plate 15 is bonded and fixed to the eraser 5 .

[0051] The eraser 5 can be immediately attached to the surface of the test frame 1 by the force of the second spring 16 pushing the movable support plate 15, ensuring that the eraser 5 can still be used to erase the indicator line after being worn out.

[0052] An indicator line 21 is provided on the upper surface of the test photo frame 1, and the indicator line 21 is distributed along the length direction of the sliding groove 4. The third magnetic block 17 and the first magnetic block 11 repel each other. An internal groove 13 is provided on the side of the sliding groove 4 away from the positioning plate 19. The end of the internal groove 13 away from the sliding groove 4 is fixedly connected to a third spring 14 that pulls the sliding bracket 18 to move toward the position of the sliding block 12.

[0053] Furthermore, the third magnetic block 17 repels the first magnetic block 11, causing the initial position of the eraser 5 to be located on the side away from the block-shaped pencil lead 10. When the flexible fabric 6 and the first magnetic block 11 above the sliding block 12 are removed, the fixing screw 7 loses its repulsive effect. At this time, the third spring 14 pulls the sliding bracket 18 toward the sliding block 12, and the eraser 5 can move along the direction of the indicator line 21 to automatically erase the indicator line on the surface of the test frame 1, eliminating the need for manual erasure. This avoids the phenomenon of needing to erase many indicator lines and wasting time when multiple sets of test components 2 are set simultaneously.

[0054] An external support frame 23 is fixedly welded to the outer wall of the rectangular frame structure, and a telescopic rod 22 for holding the sliding block 12 is fixedly provided on the external support frame 23 .

[0055] The telescopic rod 22 is a common telescopic rod, which is used to provide a guide for the sliding block 12 when it slides.

[0056] A first spring 9 is provided on the lower surface of the sliding block 12 , a telescopic hole 8 is fixedly provided on the inner wall of the upper end of the first spring 9 , and the lower end of the telescopic hole 8 is bonded and fixed to the block-shaped pencil lead 10 .

[0057] The telescopic hole 8 can elevate the block pencil lead 10 to always adhere to the surface of the test frame 1, thereby preventing the block pencil lead 10 from being unable to draw an indicator line on the surface of the test frame 1 after being consumed once.

[0058] The fixing assembly includes a fixing screw 7, and a threaded hole 27 is provided on the upper surface of the sliding block 12. The upper end of the threaded hole 27 passes through the upper and lower surfaces of the first magnetic block 11 at the same time. The threaded hole 27 corresponds to the fixing screw 7. The fixing screw 7 includes a screw portion 24 and a nut portion 25. The screw portion 24 and the threaded hole 27 are connected by threaded cooperation, and the nut portion 25 is integrally arranged at the upper end of the screw portion 24.

[0059] The screw portion 24 is connected to the threaded hole 27 by threaded engagement, and the nut portion 25 presses and fixes the corners of the flexible fabric 6 to achieve fixation of the flexible fabric 6 .

[0060] Furthermore, when the fixing screw 7 rotates in the threaded hole 27 and loosens the flexible fabric 6, the flexible fabric 6 can be removed, which makes it convenient to first observe the indicator line on the surface of the test frame 1. When the fixing screw 7 is completely removed from the threaded hole 27, the first magnetic block 11 can be removed from above the sliding block 12. At this time, the third magnetic block 17 loses its repulsive effect and uses the pulling force of the third spring 14 to approach one side of the sliding block 12. When the third magnetic block 17 approaches the sliding block 12, the eraser 5 is used to automatically erase the indicator line.

[0061] A plurality of raised teeth 26 are fixedly provided on the lower surface of the nut portion 25 , and the plurality of raised teeth 26 are distributed at equal distances.

[0062] The raised teeth 26 on the lower surface of the nut portion 25 allow the flexible fabric 6 to be stably fixed between the nut portion 25 and the first magnetic block 11 , making it difficult for the flexible fabric 6 to slip out from between the first magnetic block 11 and the nut portion 25 .

[0063] There are multiple groups of test components 2, and the multiple groups of test components 2 are distributed at equal distances along the surface of the rectangular frame structure. Fixing holes 3 are provided at the four corners of the rectangular frame structure.

[0064] When multiple groups of test components 2 are provided, the periphery of the flexible fabric 6 can be fixed at equal distances to facilitate observation of the amount of internal shear deformation of the flexible fabric 6 in multiple directions.

[0065] The above embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A photo frame testing device for evaluating in-plane shear deformation of flexible fabrics, comprising a test photo frame (1), characterized in that: The test frame (1) is a rectangular frame structure. A test component (2) is provided on the test frame (1). The test component (2) comprises a sliding block (12) slidably provided on the surface of the test frame (1) and an indicator line (21) provided on the upper surface of the test frame (1). A block-shaped pencil lead (10) is provided on the lower surface of the sliding block (12). A fixing component for fixing a flexible fabric (6) is provided above the sliding block (12). The fixing component fixes the flexible fabric (6) on the test frame (1). The flexible fabric (6) is shielded on one side of the rectangular frame structure. When the flexible fabric (6) is impacted by an external force, the sliding block (12) is driven to slide along the surface of the test frame (1). The block-shaped pencil lead (10) on the lower surface of the sliding block (12) slides on the upper surface of the test frame (1) to form an indicator line. The amount of shear deformation in the plane of the flexible fabric (6) is obtained by the length of the indicator line.

2. The photo frame testing device for evaluating in-plane shear deformation of flexible fabrics according to claim 1, characterized in that: A positioning plate (19) is fixedly provided on the inner wall of the rectangular frame, a second magnetic block (20) is fixedly provided on the upper end of the positioning plate (19), and a first magnetic block (11) is fixedly connected to the upper end of the sliding block (12), and the first magnetic block (11) and the second magnetic block (20) repel each other.

3. The photo frame testing device for evaluating in-plane shear deformation of flexible fabrics according to claim 2, characterized in that: The upper surface of the test frame (1) is provided with a sliding groove (4), a sliding bracket (18) is slidably provided in the sliding groove (4), the upper end of the sliding bracket (18) extends above the test frame (1), and a third magnetic block (17) is fixedly provided at the end of the sliding bracket (18) extending above the test frame (1), and an eraser (5) is provided below the third magnetic block (17).

4. The photo frame testing device for evaluating in-plane shear deformation of flexible fabrics according to claim 3, characterized in that: A second spring (16) is fixedly provided on the lower surface of the third magnetic block (17), a movable support plate (15) is fixedly provided on the lower end of the second spring (16), and the lower surface of the movable support plate (15) is bonded and fixed to the rubber (5).

5. The photo frame testing device for evaluating in-plane shear deformation of flexible fabrics according to claim 4, characterized in that: The upper surface of the test photo frame (1) is provided with an indicator line (21), which is distributed along the length direction of the sliding groove (4). The third magnetic block (17) and the first magnetic block (11) repel each other. The side of the sliding groove (4) away from the positioning plate (19) is provided with an internal groove (13). The end of the internal groove (13) away from the sliding groove (4) is fixedly connected to a third spring (14) for pulling the sliding bracket (18) toward the position of the sliding block (12).

6. The photo frame testing device for evaluating in-plane shear deformation of flexible fabrics according to claim 5, characterized in that: An external support frame (23) is fixedly welded to the outer wall of the rectangular frame structure, and a telescopic rod (22) for pulling the sliding block (12) is fixedly arranged on the external support frame (23).

7. The photo frame testing device for evaluating in-plane shear deformation of flexible fabrics according to claim 6, characterized in that: A first spring (9) is provided on the lower surface of the sliding block (12); a telescopic hole (8) is fixedly provided on the inner wall of the upper end of the first spring (9); and the lower end of the telescopic hole (8) is bonded and fixed to the block-shaped pencil lead (10).

8. The photo frame testing device for evaluating in-plane shear deformation of flexible fabrics according to claim 7, characterized in that: The fixing assembly includes a fixing screw (7), and a threaded hole (27) is provided on the upper surface of the sliding block (12). The upper end of the threaded hole (27) simultaneously passes through the upper and lower surfaces of the first magnetic block (11). The threaded hole (27) corresponds to the fixing screw (7). The fixing screw (7) includes a screw portion (24) and a nut portion (25). The screw portion (24) and the threaded hole (27) are connected by threaded fitting, and the nut portion (25) is integrally arranged at the upper end of the screw portion (24).

9. The photo frame testing device for evaluating in-plane shear deformation of flexible fabrics according to claim 8, characterized in that: The lower surface of the nut portion (25) is fixedly provided with a raised tooth (26), and a plurality of raised teeth (26) are provided, and the plurality of raised teeth (26) are distributed at equal distances.

10. The photo frame testing device for evaluating in-plane shear deformation of flexible fabrics according to claim 9, characterized in that: The test components (2) are provided in multiple groups, and the multiple groups of test components (2) are distributed at equal distances along the surface of the rectangular frame structure. Fixing holes (3) are provided at the four corners of the rectangular frame structure.

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