Nondestructive drawing test tool for non-metal composite pipe

Abstract

The utility model relates to the field of non-metallic composite material drawing tests, and provides a non-destructive non-metallic composite material pipe drawing test tool which comprises a flange assembly, an upper fixing disc, a lower fixing disc, an upper sliding block structure, a lower sliding block structure and a chuck. The upper flange and the lower flange are symmetrically mounted on the upper side and the lower side of the pipe, the upper fixing disc and the upper sliding block structure form a first mounting cavity, and the upper flange is fixed in the first mounting cavity; the lower flange is fixed on the test platform through the lower fixing disc and the lower sliding block structure, the chuck is installed at the central position of the upper fixing disc, and the test machine conducts drawing test on the pipe by clamping the chuck. According to the non-destructive drawing test tool for the non-metal composite material pipe, the pipe cannot be damaged during test, the drawing test of the non-metal composite material pipe can be realized, and the test method has the advantages of high reliability and accurate measured data.

Description

Technical Field

[0001] This utility model relates to the field of pull-out testing of non-metallic composite materials, and more specifically, to a non-destructive pull-out testing fixture for non-metallic composite material pipes. Background Technology

[0002] Non-metallic composite materials possess advantages such as high specific strength, corrosion resistance, and good fatigue resistance, and are widely used in aerospace, shipbuilding, and automotive fields. As non-metallic composite materials increasingly become key structural materials, the experimental characterization of these materials is becoming increasingly important.

[0003] Pull-out testing of composite material pipes is a test method for evaluating the tensile strength of specimens, used to assess the mechanical properties of the specimen itself or the reliability of different connection methods. Metal pipes are generally subjected to pull-out tests using testing machine fixtures, drilling, welding, etc. However, due to the molding characteristics of non-metallic composite materials, clamping and drilling methods on the pipe can easily cause damage to the reinforcing fibers in the clamping area and at the drilling points, severely affecting the test results and reliability of the specimen.

[0004] Therefore, it is essential to design a non-destructive drawing tool for non-metallic composite pipes.

[0005] In view of the above, this utility model is hereby proposed. Utility Model Content

[0006] The purpose of this invention is to propose a non-destructive pull-out test fixture for non-metallic composite pipes, so as to solve the problem of the lack of non-destructive pull-out fixtures for non-metallic composite pipes in the prior art.

[0007] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0008] A non-destructive pull-out testing fixture for non-metallic composite pipes is disclosed. The testing machine performs pull-out tests on the pipes using this fixture. The fixture includes a flange assembly, an upper fixed plate, a lower fixed plate, an upper slider structure, a lower slider structure, and a clamp. The flange assembly includes an upper flange and a lower flange, which are symmetrically installed on the upper and lower sides of the pipe. The upper fixed plate and the upper slider structure form a first mounting cavity, and the upper flange is fixed inside the first mounting cavity. The lower flange is fixed to the testing platform via the lower fixed plate and the lower slider structure. The clamp is installed at the center of the upper fixed plate. The testing machine transmits tensile load to the pull-out testing fixture through the clamp to perform the pull-out test on the pipe.

[0009] The present invention discloses a non-destructive pull-out testing fixture for non-metallic composite pipes, which is used to measure the structural stiffness and strength of non-metallic composite pipes. When using the pull-out testing fixture, there is no need to drill holes or clamp the pipe specimen under test, and it will not cause damage to the pipe body. It can realize the pull-out test of non-metallic composite pipes, and the testing method has the advantages of high reliability and accurate measurement data.

[0010] Furthermore, the pipe, upper flange, and lower flange are manufactured by bonding or integral molding.

[0011] Furthermore, the flange assembly includes a straight segment and a curved segment, wherein the thickness of the curved segment is set to be smaller at both ends and larger in the middle.

[0012] Furthermore, the inner arc of the curve segment and the outer arc of the curve segment are not concentrically set. The radius of the inner arc of the curve segment is R1, and the radius of the outer arc of the curve segment is R2. R1 and R2 satisfy: R1 <R2。

[0013] Furthermore, the maximum outer diameter of the straight segment is D21, and the maximum outer diameter of the curved segment is denoted as D22. A second clearance hole is provided at the center of the lower fixed plate, and the diameter of the second clearance hole is denoted as D4. D21, D22, and D4 satisfy: D21 <D4<D22。

[0014] Furthermore, a first arc-shaped contact surface is provided on the outer surface of the curved segment, and a second arc-shaped contact surface is provided on the upper slider structure, the second arc-shaped contact surface cooperating with the first arc-shaped contact surface of the upper flange; a third arc-shaped contact surface is provided on the lower slider structure, the third arc-shaped contact surface cooperating with the first arc-shaped contact surface of the lower flange.

[0015] Furthermore, the upper fixing plate is disposed above the upper flange, and the upper sliding block structure is disposed below the upper flange.

[0016] Furthermore, a second mounting cavity is provided below the lower fixed plate, the lower slider structure is installed inside the second mounting cavity, and the lower slider structure is positioned above the lower flange.

[0017] Furthermore, a weight-reduction structure is provided on the pull-out test fixture.

[0018] Furthermore, the upper slider structure, the lower fixed plate, and the lower slider structure are all composed of at least two parts spliced ​​together.

[0019] Compared with the prior art, the non-destructive pull-out testing fixture for non-metallic composite pipes described in this utility model has the following advantages:

[0020] The present invention discloses a non-destructive pull-out testing fixture for non-metallic composite pipes, which can be used to measure the structural stiffness and strength of various non-metallic composite pipes. When using the pull-out testing fixture, there is no need to drill holes or clamp the pipe specimen under test, and it will not cause damage to the pipe body. It can realize the pull-out test of non-metallic composite pipes. The testing method has the advantages of high reliability, accurate measurement data, and simple operation. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of a non-destructive pull-out test fixture for non-metallic composite pipes according to an embodiment of the present invention.

[0022] Figure 2 This is a front view schematic diagram of a non-destructive pull-out test fixture for non-metallic composite pipes according to an embodiment of the present invention.

[0023] Figure 3 This is a top view schematic diagram of a non-destructive pull-out test fixture for non-metallic composite pipes according to an embodiment of the present invention.

[0024] Figure 4 For along Figure 3 A schematic diagram of the cross-sectional structure along the mid-section line AA;

[0025] Figure 5 This is a bottom-view three-dimensional structural diagram of the upper fixing plate of a non-destructive pull-out test fixture for non-metallic composite pipes according to an embodiment of this utility model.

[0026] Figure 6 This is a top-view three-dimensional structural diagram of the upper slider structure of a non-destructive pull-out test fixture for non-metallic composite pipes according to an embodiment of the present invention.

[0027] Figure 7 This is a bottom-view three-dimensional structural diagram of the lower fixing plate of a non-destructive pull-out test fixture for non-metallic composite pipes according to an embodiment of this utility model.

[0028] Figure 8 This is a top view of the lower fixing plate of a non-destructive pull-out test fixture for non-metallic composite pipes according to an embodiment of the present invention.

[0029] Figure 9 This is a top-view three-dimensional structural diagram of the lower slider structure of a non-destructive pull-out test fixture for non-metallic composite pipes according to an embodiment of this utility model.

[0030] Figure 10 This is a three-dimensional structural diagram of the upper flange of a non-destructive pull-out test fixture for non-metallic composite pipes according to an embodiment of this utility model.

[0031] Figure 11 This is a bottom view of the upper flange of a non-destructive pull-out test fixture for non-metallic composite pipes according to an embodiment of the present invention.

[0032] Figure 12 For along Figure 11 A schematic diagram of the cross-sectional structure along the mid-section line AA;

[0033] Figure 13 This is a three-dimensional structural diagram of the upper and lower flanges of a non-destructive pull-out test fixture for non-metallic composite pipes, as described in an embodiment of this utility model, installed together with the pipe.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Pipe; 2. Flange assembly; 21. Upper flange; 22. Lower flange; 201. Straight section; 2011. Adhesive surface; 2012. Limiting boss; 202. Curved section; 2021. First arc-shaped contact surface; 31. Upper fixing plate; 311. First connecting hole; 312. First mounting hole; 313. First weight-reducing groove; 314. First mounting cavity; 32. Lower fixing plate; 321. Third connecting hole; 322. Second clearance hole; 323. Second weight-reducing groove; 324. Second mounting cavity; 3201 1. First disc body; 3202. Second disc body; 41. Upper slider structure; 412. Second arc-shaped contact surface; 413. Second connecting hole; 414. First clearance hole; 4101. First upper slider; 4102. Second upper slider; 42. Lower slider structure; 421. Third arc-shaped contact surface; 422. Third weight reduction groove; 423. Fourth connecting hole; 424. Third clearance hole; 4201. First lower slider; 4202. Second lower slider; 7. Clamp; 81. First connector; 82. Second connector. Detailed Implementation

[0036] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The descriptions of "first," "second," etc., mentioned in the embodiments of this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0037] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Example 1

[0038] There is a lack of non-destructive drawing tools for non-metallic composite pipes in the current technology.

[0039] To solve the above technical problems, such as Figures 1-13 As shown, this embodiment proposes a non-destructive pull-out test fixture for non-metallic composite pipes. The testing machine performs a pull-out test on pipe 1 using the non-destructive pull-out test fixture for non-metallic composite pipes. The pull-out test fixture for non-metallic composite pipes includes a flange assembly 2, an upper fixed plate 31, a lower fixed plate 32, an upper slider structure 41, a lower slider structure 42, and a clamp 7. The flange assembly 2 includes an upper flange 21 and a lower flange 22, which are symmetrically installed on the upper and lower sides of the pipe 1. The upper fixed plate 31 and the upper slider structure 41 form a first mounting cavity 314, and the upper flange 21 is fixed inside the first mounting cavity 314 and completely fixed by the first mounting cavity 314. The lower flange 22 is fixed on the test platform by the lower fixed plate 32 and the lower slider structure 42. The clamp 7 is installed at the center position of the upper fixed plate 31. The testing machine transmits tensile load to the pull-out test fixture by holding the clamp 7 to perform a pull-out test on the pipe 1.

[0040] The present invention discloses a non-destructive pull-out testing fixture for non-metallic composite pipes, which is suitable for testing the structural stiffness and strength of various non-metallic composite pipes 1. When using the pull-out testing fixture, there is no need to drill holes or clamp on the pipe 1 specimen to be tested. The testing machine only needs to clamp the chuck 7, which will not cause damage to the pipe 1 body. It can realize the pull-out test of non-metallic composite pipes 1. The testing method has the advantages of high reliability, accurate measurement data and simple operation.

[0041] Specifically, the pipe 1, upper flange 21 and lower flange 22 are manufactured by bonding or integral molding, which avoids the drawbacks of drilling or clamping on the pipe 1 in traditional testing methods and realizes non-destructive testing of the pipe 1.

[0042] More specifically, in this embodiment, the pipe 1, the upper flange 21, and the lower flange 22 are manufactured by bonding.

[0043] More specifically, in this embodiment, the upper flange 21 and the lower flange 22 are manufactured by bonding with adhesive.

[0044] Specifically, the overall appearance of the flange assembly 2 is trumpet-shaped. The flange assembly 2 includes a straight section 201 and a curved section 202. Inside the straight section 201, there is an adhesive surface 2011. The flange assembly 2 contacts the pipe 1 through the adhesive surface 2011. Inside the straight section 201, there is a limiting boss 2012, which is used to limit the pipe 1, and the limiting boss 2012 cooperates with the pipe 1.

[0045] Specifically, the length of the adhesive surface 2011 is L, the designed maximum load is F, the adhesive bonding strength is M, the outer diameter of the pipe 1 is D, and the circumference of the pipe 1 is S = π * D. Considering the safety factor k (k > 1) at the same time, L satisfies: L = k * F / M / S.

[0046] Specifically, according to the finite element simulation analysis results, in order to improve the structural strength of the flange assembly 2, the thickness of the curved section 202 is set to be smaller at both ends and larger in the middle.

[0047] More specifically, the wall thickness of the curved section 202 adopts a non-uniform thickness design. The inner and outer arcs of the curved section 202 are designed as two non-concentric circular curves. The inner arc of the curved section 202 and the outer arc of the curved section 202 are non-concentrically arranged. The radius of the inner arc of the curved section 202 is R1, and the radius of the outer arc of the curved section 202 is R2. R1 and R2 satisfy R1 < R2. The above settings make the thickness of the curved section 202 smaller at both ends and larger in the middle.

[0048] Specifically, the maximum outer diameter of the straight section 201 is D21, and the maximum outer diameter of the curved section 202 is denoted as D22. A second avoidance hole 322 is provided at the center of the lower fixing plate 32, and the diameter of the second avoidance hole 322 is denoted as D4. D21, D22, and D4 satisfy: D21 < D4 < D22; this setting can ensure that the lower fixing plate 32 can effectively fix the lower lower flange 22 and the lower slider structure 42.

[0049] Specifically, a first arc contact surface 2021 is provided on the outer surface of the curved section 202. A second arc contact surface 412 is provided on the upper slider structure 41, and the second arc contact surface 412 cooperates with the first arc contact surface 2021 of the upper flange 21; a third arc contact surface 421 is provided on the lower slider structure 42, and the third arc contact surface 421 cooperates with the first arc contact surface 2021 of the lower flange 22.

[0050] Specifically, the upper fixing plate 31 is arranged above the upper flange 21, and the upper slider structure 41 is arranged below the upper flange 21.

[0051] Specifically, a first connecting hole 311 is provided on the upper fixed plate 31, and a second connecting hole 413 is provided on the upper slider structure 41. The second connecting hole 413 cooperates with the first connecting hole 311, and the first connecting member 81 connects the upper fixed plate 31 and the upper slider structure 41 together in sequence through the first connecting hole 311 and the second connecting hole 413.

[0052] Specifically, a first mounting hole 312 is provided on the upper fixed plate 31. The first mounting hole 312 is located at the center of the upper fixed plate 31 and is used to install the chuck 7.

[0053] Specifically, a first clearance hole 414 is provided on the upper slider structure 41, which is used to avoid the upper flange 21.

[0054] Specifically, a second mounting cavity 324 is provided below the lower fixed plate 32, and the lower slider structure 42 is installed inside the second mounting cavity 324. The lower slider structure 42 is located above the lower flange 22; the diameter of the second mounting cavity 324 is larger than the diameter of the lower slider structure 42.

[0055] This configuration causes the upper and lower end faces of the lower slider structure 42 to be constrained by the lower fixed plate 32 and the lower flange 22, respectively, while there are gaps on the left and right end faces. During the pull-out test, the first arc-shaped contact surface 2021 can be moved in a limited manner according to the installation state and the stress state. On the one hand, this facilitates the adjustment of the installation state during tooling installation, and on the other hand, it avoids problems such as misalignment and poor coaxiality during the test.

[0056] Specifically, a third connecting hole 321 is provided on the lower fixed plate 32, and a fourth connecting hole 423 is provided on the lower sliding block structure 42. The fourth connecting hole 423 cooperates with the third connecting hole 321, and the second connecting member 82 connects the lower fixed plate 32 and the lower sliding block structure 42 together in sequence through the third connecting hole 321 and the fourth connecting hole 423.

[0057] Specifically, the lower slider structure 42 and the lower fixed plate 32 are connected by multiple second connectors 82.

[0058] Specifically, the first connector 81 and the second connector 82 are not specifically limited.

[0059] More specifically, in this embodiment, the first connector 81 and the second connector 82 are bolts, but are not limited thereto.

[0060] Specifically, a second clearance hole 322 is provided on the lower fixed plate 32, and a third clearance hole 424 is provided on the lower sliding block structure 42. The second clearance hole 322 and the third clearance hole 424 cooperate with each other, and both the second clearance hole 322 and the third clearance hole 424 are used to avoid the lower flange 22.

[0061] Specifically, a weight-reducing structure is provided on the pull-out test fixture to reduce the weight of the pull-out test fixture.

[0062] More specifically, a first weight-reducing groove 313 is provided on the upper fixed plate 31, a second weight-reducing groove 323 is provided on the lower fixed plate 32, and a third weight-reducing groove 422 is provided on the lower slider structure 42, in order to reduce the weight of the pull-out test fixture.

[0063] Specifically, the upper slider structure 41, the lower fixed plate 32, and the lower slider structure 42 are all assembled from at least two parts, which facilitates the installation and disassembly of the upper slider structure 41, the lower fixed plate 32, and the lower slider structure 42 after the pipe 1 is connected to the upper flange 21 and the lower flange 22.

[0064] Specifically, the upper slider structure 41 is composed of at least two parts spliced ​​together, which facilitates the installation and disassembly of the upper slider structure 41 after the pipe 1 and the upper flange 21 are connected.

[0065] More specifically, in this embodiment, the upper slider structure 41 is composed of two parts spliced ​​together, and the upper slider structure 41 includes a first upper slider 4101 and a second upper slider 4102.

[0066] Specifically, the lower fixing plate 32 is composed of at least two parts spliced ​​together, which facilitates the installation and disassembly of the lower fixing plate 32 after the pipe 1 and the lower flange 22 are connected.

[0067] Specifically, in this embodiment, the lower fixing plate 32 is composed of two parts spliced ​​together, and the lower fixing plate 32 includes a first plate body 3201 and a second plate body 3202.

[0068] Specifically, the sliding block structure 42 is composed of at least two parts spliced ​​together, which facilitates the installation and disassembly of the sliding block structure 42 after the pipe 1 and the lower flange 22 are connected.

[0069] In this embodiment, the sliding block structure 42 is composed of two parts spliced ​​together, including a first sliding block 4201 and a second sliding block 4202.

[0070] This embodiment also provides an operation method for a non-destructive drawing test tooling of a non-metallic composite material pipe. The operation method for the non-destructive drawing test tooling of the non-metallic composite material pipe is used to operate any one of the above-mentioned drawing test toolings. The operation method for the non-destructive drawing test tooling of the non-metallic composite material pipe includes the following steps;

[0071] S1. The pipe 1, the upper flange 21 and the lower flange 22 are made by bonding with an adhesive, and wait for the adhesive to be completely cured;

[0072] S2. Install the upper slider structure 41 and the upper fixing plate 31 on the upper flange 21, and lock and fix the upper slider structure 41 and the upper fixing plate 31 through the first connecting piece 81;

[0073] S3. Install the lower slider structure 42 and the lower fixing plate 32 on the lower flange 22, and lock and fix the lower slider structure 42 and the lower fixing plate 32 through the second connecting piece 82;

[0074] S4. Start the testing machine without applying a tensile load. The testing machine only holds the chuck 7 in the middle of the upper fixing plate 31; then fix the lower fixing plate 32 on the test platform, check the installation state of the pipe 1 and the drawing test tooling, and start the test.

[0075] This embodiment relates to a non-destructive drawing test tooling for a non-metallic composite material pipe and an operation method thereof. The key points of the present invention are:

[0076] 1. The pipe 1, the upper flange 21 and the lower flange 22 are made by bonding or integrally molding, without clamping or punching the pipe 1, etc., and will not cause damage to the pipe 1 body.

[0077] 2. In order to improve the strength of the flange assembly 2, according to the finite element simulation analysis results, the thickness of the curve segment 202 is set to be small at both ends and large in the middle. The inner arc of the curve segment 202 and the outer arc of the curve segment 202 are not concentrically arranged. The radius of the inner arc of the curve segment 202 is R1, and the radius of the outer arc of the curve segment 202 is R2. R1 and R2 satisfy R1 < R2. The above settings make the thickness of the curve segment 202 small at both ends and large in the middle.

[0078] 3. A second mounting cavity 324 is provided below the lower fixed plate 32, and the sliding block structure 42 is installed inside the second mounting cavity 324. The sliding block structure 42 is located above the lower flange 22; the diameter of the second mounting cavity 324 is larger than the diameter of the sliding block structure 42. This arrangement ensures that the upper and lower end faces of the sliding block structure 42 are constrained by the lower fixed plate 32 and the lower flange 22, respectively, while there are gaps on the left and right end faces. During the pull-out test, it can move in a limited manner on the first arc-shaped contact surface 2021 according to the installation state and the stress state. This facilitates the adjustment of the installation state during tooling installation and avoids problems such as misalignment and poor coaxiality during the test.

[0079] 4. The upper slider structure 41 is composed of at least two parts, which facilitates the installation and disassembly of the upper slider structure 41 after the pipe 1 and the upper flange 21 are connected; the lower fixing plate 32 is composed of at least two parts, which facilitates the installation and disassembly of the lower fixing plate 32 after the pipe 1 and the flange 2 are connected; the lower slider structure 42 is composed of at least two parts, which facilitates the installation and disassembly of the lower slider structure 42 after the pipe 1 and the lower flange 22 are connected.

[0080] 5. The second arc-shaped contact surface 412 of the upper slider structure 41 cooperates with the first arc-shaped contact surface 2021 of the upper flange 21. At the same time, the upper flange 21 is completely fixed by the first mounting cavity 314 formed by the upper slider structure 41 and the upper fixed plate 31. The upper slider structure 41 and the upper fixed plate 31 are connected by multiple first connecting pieces 81. Example 2

[0081] In this embodiment, unlike in embodiment 1, the pipe 1 and the flange assembly 2 are manufactured by integral molding.

[0082] The operation method of the non-destructive pull-out test fixture for non-metallic composite tubes includes the following steps;

[0083] S1. Pipe 1, upper flange 21 and lower flange 22 are manufactured by integral molding;

[0084] S2. Install the upper slider structure 41 and the upper fixed plate 31 on the upper flange 21, and lock and fix the upper slider structure 41 and the upper fixed plate 31 through the first connecting piece 81.

[0085] S3. Install the lower slider structure 42 and the lower fixed plate 32 on the lower flange 22, and lock and fix the lower slider structure 42 and the lower fixed plate 32 through the second connector 82.

[0086] S4. First, fix the lower fixed plate 32 on the test platform and check the installation status of the pipe 1 and the pull-out test fixture; then start the test machine. The test machine only clamps the middle clamp 7 of the upper fixed plate 31 to apply tensile load and start the test.

[0087] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A non-metallic composite pipe non-destructive tensile testing fixture, characterized by, The testing machine carries out the drawing test on the pipe (1) through the drawing test tool, the drawing test tool comprises a flange assembly (2), an upper fixing disc (31), a lower fixing disc (32), an upper sliding block structure (41), a lower sliding block structure (42) and a chuck (7), the flange assembly (2) comprises an upper flange (21) and a lower flange (22), the upper flange (21) and the lower flange (22) are symmetrically installed on the upper and lower sides of the pipe (1), the upper fixing disc (31) and the upper sliding block structure (41) form a first installation cavity (314), and the upper flange (21) is fixed in the first installation cavity (314); the lower flange (22) is fixed on the test platform through the lower fixing disc (32) and the lower sliding block structure (42), and the chuck (7) is installed at the center position of the upper fixing disc (31); the testing machine carries out the drawing test on the pipe (1) by transmitting the tensile load to the drawing test tool through the chuck (7).

2. A non-metallic composite pipe non-destructive tensile testing tooling according to claim 1, wherein, The pipe (1), the upper flange (21) and the lower flange (22) are made by bonding or one-piece forming.

3. A non-metallic composite pipe non-destructive tensile testing tooling according to claim 1, wherein, The flange assembly (2) comprises a straight line segment (201) and a curved line segment (202), and the thickness of the curved line segment (202) is set to be small at both ends and large in the middle.

4. A non-metallic composite pipe non-destructive tensile testing tooling according to claim 3, wherein, The inner arc line of the curved line segment (202) is arranged off-center with the outer arc line of the curved line segment (202), the radius of the inner arc line of the curved line segment (202) is R1, the radius of the outer arc line of the curved line segment (202) is R2, and R1 and R2 satisfy R1 < R2.

5. A non-metallic composite pipe non-destructive tensile testing tooling according to claim 3, wherein, The maximum outer diameter of the straight line segment (201) is D21, the maximum outer diameter of the curved line segment (202) is D22, a second avoiding hole (322) is arranged at the center of the lower fixing disc (32), the diameter of the second avoiding hole (322) is D4, and D21, D22 and D4 satisfy D21 < D4 < D22.

6. A non-metallic composite pipe non-destructive tensile testing tooling according to claim 3, wherein, A first arc-shaped contact surface (2021) is arranged on the outer surface of the curved line segment (202), a second arc-shaped contact surface (412) is arranged on the upper sliding block structure (41), and the second arc-shaped contact surface (412) cooperates with the first arc-shaped contact surface (2021) of the upper flange (21); a third arc-shaped contact surface (421) is arranged on the lower sliding block structure (42), and the third arc-shaped contact surface (421) cooperates with the first arc-shaped contact surface (2021) of the lower flange (22).

7. A non-metallic composite pipe non-destructive tensile testing tooling according to claim 1, wherein, The upper fixing disc (31) is arranged above the upper flange (21), and the upper sliding block structure (41) is arranged below the upper flange (21).

8. A non-metallic composite pipe non-destructive tensile testing tooling according to claim 1, wherein, A second installation cavity (324) is arranged below the lower fixing disc (32), the lower sliding block structure (42) is arranged inside the second installation cavity (324), and the lower sliding block structure (42) is arranged above the lower flange (22).

9. A non-metallic composite pipe non-destructive tensile testing tooling according to claim 1, wherein, A weight-reducing structure is arranged on the drawing test tool.

10. A non-metallic composite pipe non-destructive tensile testing tooling according to claim 1, wherein, The upper sliding block structure (41), the lower fixing disc (32) and the lower sliding block structure (42) are all spliced by at least two parts.

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