A static pressure strength failure test device and test method for thin-walled brittle pipe fittings

Abstract

The present invention relates to the technical field of mechanical property testing, and in particular to a static pressure strength destruction test device and test method for thin-walled pipe fittings. The test device includes a pair of side plates, each of which is provided with a clamping assembly for clamping the thin-walled pipe fitting, and the clamping assembly clamps the thin-walled pipe fitting between the two side plates, and at least one connecting rod is horizontally connected between the two side plates; the clamping assembly includes a coaxially arranged pressurizing seat and a locking piece; the locking piece is sleeved on the thin-walled pipe fitting and is threadedly matched with the pressurizing seat; one of the pressurizing seats is axially through, and is used to input high-pressure liquid into the thin-walled pipe fitting, and the corresponding end of the thin-walled pipe fitting is provided with a corresponding pressure inlet. Compared with the prior art, the test device of the present invention can be used as a universal test device for thin-walled pipe fittings, which can firmly clamp the two ends of the thin-walled pipe fittings, and perform static pressure strength destruction test on the thin-walled pipe fittings after the high-pressure liquid is introduced.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical performance testing, and in particular to a static pressure strength destruction testing device and a testing method for thin-wall brittle pipe fittings. Background Art

[0002] In order to ensure the safe development of nuclear power, countries around the world are developing a new generation of nuclear fuel cladding materials that can replace zirconium alloys. f / SiC composite materials have excellent mechanical properties and thermal shock resistance under neutron irradiation and high temperature environment, especially after the loss of coolant, they can still ensure the integrity of the cladding tube structure and improve the accident resistance. In addition, its high specific strength, high specific modulus, oxidation resistance, fatigue creep resistance, insensitivity to cracks, and no catastrophic damage have attracted much attention and become the key innovation direction of future nuclear fuel accident-resistant cladding.

[0003] To ensure SiC f In order to ensure the safety and effectiveness of SiC composite cladding tubes during operation, it is necessary to comprehensively characterize the performance of the cladding tubes, including mechanical properties, thermal conductivity, radiation resistance, hydrothermal corrosion resistance, etc. The mechanical properties tests mainly include the axial tensile properties and circumferential compressive properties of the cladding tubes. For the test of circumferential strength, the industry currently mainly uses expansion plug test and circumferential tensile test. However, the expansion plug method is suitable for testing the circumferential strength of non-brittle materials, but not suitable for SiC f / SiC composite cladding tubes and zirconium tubes and other thin-walled materials. During the ring pull test, the bending of the tube is prone to cause local stress concentration, which affects the accuracy of the test results. Therefore, it is necessary to design a static pressure strength failure tool to accurately detect SiC f Mechanical properties of SiC composite cladding tubes, zirconium tubes and other brittle pipes.

[0004] The static pressure destructive performance test of thin-walled tubes is to measure the ability of thin-walled tubes to withstand internal pressure by loading incompressible liquids such as water and oil into the thin-walled tubes until they burst. One end of the test fixture is connected to a high-pressure incompressible liquid to fix the thin-walled tube and input the high-pressure liquid into the thin-walled tube to cause the tube to burst. Therefore, high requirements are placed on the sealing performance of the test fixture. The related paper "Design and Application of New Sealing Components for Thin-walled Tube Burst Test" (Wang Wei, Yu Junhui. Metal World, 2020(1):3) proposed an end sealing method using a metal end conical inner cone and a metal plug. However, due to the high hardness and modulus of metal materials, sealing can only be guaranteed by metal connection. When the burst pressure is relatively large, there is a problem of pressure relief.

[0005] Therefore, it is urgent to develop a static pressure strength destruction testing device for thin-walled pipe fittings to perform static pressure destruction performance testing on thin-walled pipe fittings. Summary of the invention

[0006] The purpose of the present invention is to provide a thin-walled pipe static pressure strength failure test device and a test method in order to overcome the defect that the prior art cannot perform static pressure strength failure test on thin-walled brittle pipes.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] The present invention provides a static pressure strength destruction test device for thin-walled pipe fittings, which is used for clamping thin-walled pipe fittings and performing static pressure strength destruction tests. The device comprises a pair of side plates, each of which is provided with a clamping assembly for clamping the thin-walled pipe fittings. The clamping assembly clamps the thin-walled pipe fittings between the two side plates, and at least one connecting rod is horizontally connected between the two side plates.

[0009] The clamping assembly includes a coaxially arranged pressurizing seat and a locking piece; the pressurizing seat horizontally penetrates the side plate, and is provided with a multi-step structure for inserting the end of the thin-walled pipe along the axial direction, and the two ends of the thin-walled pipe are respectively inserted into the corresponding multi-step structure; the locking piece is sleeved on the thin-walled pipe and is threadedly matched with the pressurizing seat;

[0010] One of the pressurizing seats is axially penetrated and used for inputting high-pressure liquid to the corresponding end of the thin-walled pipe fitting, and the corresponding end of the thin-walled pipe fitting is provided with a corresponding pressure inlet.

[0011] Furthermore, the side panels are all mounted on the bottom plate via first fasteners to improve the stability of the entire testing device.

[0012] Furthermore, the pressurizing seat is fastened to the side plate by a second fastener to improve the stability of the entire testing device.

[0013] Furthermore, both ends of the connecting rod pass through the side plates on the corresponding sides and are installed on the side plates through a third fastener to ensure that the test device of this embodiment does not deform in the axial direction of the thin-walled pipe during static pressure destruction, thereby ensuring the effectiveness and safety of the test.

[0014] Furthermore, the number of the connecting rods is two, and the two connecting rods are at the same horizontal height and are symmetrically arranged with respect to the thin-walled pipe.

[0015] Furthermore, the pressurizing seat includes a first annular structure and a second annular structure which are coaxially arranged.

[0016] Furthermore, the first annular structure is arranged on the inner side of the side plate and has an outer diameter greater than that of the second annular structure, and the locking member is threadedly matched with the inner side wall of the first annular structure.

[0017] Furthermore, the second annular structure passes through the side plate and partially extends to the outside of the side plate.

[0018] Furthermore, in the multi-step step structure, a first step is formed between the first annular structure and the second annular structure, and a second step and a third step are sequentially arranged in the second annular structure.

[0019] Furthermore, the locking member can abut against the first step after being threadedly matched with the first annular structure.

[0020] Furthermore, the clamping assembly also includes a gasket and a sealing member sleeved on the end of the thin-walled pipe.

[0021] After high-pressure liquid is introduced through the pressure inlet, the outer surface of the thin-walled pipe is coaxially matched with the surface of the internal step of the pressurizing seat and the seal, and a dynamic sealing cavity is formed between the end of the thin-walled pipe and the bottom of the multi-step structure in the pressurizing seat, giving the thin-walled pipe a certain amount of activity space at both ends of the axial direction. The coaxial match can eliminate stress concentration caused by assembly and other factors to ensure the authenticity of the test results, and the dynamic seal can eliminate the detection error caused by the axial force of the thin-walled pipe due to the Poisson effect under the internal pressure.

[0022] Furthermore, the gasket is arranged in the second annular structure and is adapted to the shape of the step structure in the second annular structure.

[0023] Furthermore, the sealing member is in contact with the gasket and can abut against the third step, and the sealing member is in a compressed state under the pressure of the gasket.

[0024] Furthermore, the sealing member may be a commonly used O-ring, and may be made of rubber or nitrile material.

[0025] Furthermore, the locking member comprises an integrally formed threaded portion and a locking portion, wherein the threaded portion can be threadably matched with the pressurizing seat.

[0026] The present invention provides a method for testing the static pressure strength of a thin-walled pipe, which adopts the above-mentioned static pressure strength testing device for thin-walled pipe, and specifically comprises the following steps:

[0027] S1: The thin-walled pipe to be tested is clamped and fixed between two side plates by a clamping assembly;

[0028] S2: Connect the pressure inlet of the thin-walled pipe fitting to the external pressure source and introduce high-pressure liquid;

[0029] S3: Observe the state changes of thin-walled pipes as pressure increases to confirm the static pressure breaking strength of thin-walled pipes.

[0030] Furthermore, the thin-walled tube includes SiC f / SiC thin-walled tubes, aluminum alloy tubes, corundum thin-walled tubes, C / C composite thin-walled tubes, carbon fiber reinforced resin composite thin-walled tubes and zirconium thin-walled tubes.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) The static pressure strength destruction test device for thin-walled pipe fittings of the present invention can firmly clamp the two ends of the thin-walled pipe fittings on the side plates, and ensure that the axial direction of the thin-walled pipe fittings does not change during the test process through the connecting rod, and the static pressure strength destruction test of the thin-walled pipe fittings can be performed after high-pressure liquid is introduced from one end of the thin-walled pipe fittings.

[0033] (2) After the high-pressure liquid is introduced through the pressure inlet of the present invention, the outer surface of the thin-walled pipe fitting is coaxially matched with the surface of the internal step of the pressurizing seat and the sealing member to form a dynamic seal. The coaxial matching can eliminate the stress concentration caused by factors such as assembly to ensure the authenticity of the detection result. The dynamic sealing can eliminate the detection error caused by the axial force of the thin-walled pipe fitting due to the Poisson effect under the action of internal pressure.

[0034] (3) The pressurizing seat of the present invention has a lightweight design with an internal multi-step structure and a tight fit between the gasket and the seal to achieve a better sealing effect.

[0035] (4) The static pressure strength failure test device of the thin-walled pipe of the present invention can meet the requirements of SiC pipes with an outer diameter of 5-30 mm, a wall thickness of 0.5-3 mm, and a length of 20-4000 mm. f The static pressure destruction test of C / C thin-walled tube, corundum thin-walled tube, C / C composite thin-walled tube, carbon fiber reinforced resin matrix composite thin-walled tube and zirconium thin-walled tube has the characteristics of simple structure, practicality and high efficiency, and can be used as a universal testing device for thin-walled pipe fittings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of the static pressure strength destruction testing device for thin-walled pipes of the present invention.

[0037] Figure 2 It is a cross-sectional view of the static pressure strength destruction testing device for thin-walled pipes of the present invention.

[0038] Figure 3 It is a schematic diagram of another side view of the static pressure strength destruction testing device for thin-walled pipes of the present invention.

[0039] Figure 4 This is a schematic structural diagram of a pressurizing seat according to Embodiment 4 of the present invention.

[0040] Figure 5 This is a schematic diagram of the structure of the locking member of Example 4 of the present invention.

[0041] Figure 6 This is a schematic diagram of the structure of the gasket of Example 5 of the present invention.

[0042] Description of the markings in the figure:

[0043] 1-thin-wall pipe fittings, 11-pressure inlet;

[0044] 2-side panels;

[0045] 3-clamping assembly, 31-pressing seat, 311-first annular structure, 312-second annular structure, 32-locking member, 321-threaded portion, 322-locking portion, 33-washer, 34-sealing member;

[0046] 4-Connecting rod;

[0047] 5- first fastener;

[0048] 6- bottom plate;

[0049] 7- second fastener;

[0050] 8- Third fastener. DETAILED DESCRIPTION

[0051] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0052] In the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0054] Example 1

[0055] This embodiment provides a thin-walled pipe static pressure strength failure test device, which is used to clamp a thin-walled pipe 1 and perform a static pressure strength failure test. Figure 1-2 As shown, the testing device includes a pair of side plates 2, each of which is provided with a clamping assembly 3 for clamping a thin-walled pipe 1. The clamping assembly 3 clamps the thin-walled pipe 1 between the two side plates 2, and at least one connecting rod 4 is horizontally connected between the two side plates 2.

[0056] The clamping assembly 3 includes a coaxially arranged pressurizing seat 31 and a locking member 32. The pressurizing seat 31 horizontally penetrates the side plate 2, and is provided with a multi-step structure for the end of the thin-walled pipe 1 to be inserted in the axial direction, and the two ends of the thin-walled pipe 1 are respectively inserted into the corresponding multi-step structure. The locking member 32 is sleeved on the thin-walled pipe 1 and is threadedly matched with the pressurizing seat 31.

[0057] In the test device of this embodiment, one of the pressurizing seats 31 is axially penetrated and used to input high-pressure liquid to the corresponding end of the thin-walled pipe 1, and the corresponding end of the thin-walled pipe 1 is provided with a corresponding pressure inlet 11. The outer side of the pressurizing seat 31 on the other side is sealed, such as Figure 3 shown.

[0058] This embodiment uses the above-mentioned testing device to perform static pressure strength destructive test on the thin-walled pipe 1. The specific testing method is as follows:

[0059] S1: The thin-walled pipe 1 to be tested is clamped and fixed between two side plates 2 by a clamping assembly 3;

[0060] S2: Connect the pressure inlet 11 of the thin-walled pipe 1 to an external pressure source and introduce high-pressure liquid;

[0061] S3: Observe the state change of the thin-walled pipe 1 as the pressure increases, and confirm the static pressure breaking strength of the thin-walled pipe 1.

[0062] Example 2

[0063] The present embodiment provides a static pressure strength failure test device for thin-walled pipe fittings, which is used to clamp a thin-walled pipe fitting 1 and perform a static pressure strength failure test. The test device of the present embodiment includes a pair of side plates 2, each of which is provided with a clamping assembly 3 for clamping the thin-walled pipe fitting 1, and the clamping assembly 3 clamps the thin-walled pipe fitting 1 between the two side plates 2, and at least one connecting rod 4 is horizontally connected between the two side plates 2.

[0064] The difference from the first embodiment is that the two side panels 2 of the present embodiment are mounted on the bottom panel 6 by the first fastener 5 to enhance the overall stability of the entire test device. The first fastener 5 can be a commonly used hexagonal bolt. The pressure seat 31 is fastened and mounted on the side panel 2 by the second fastener 7 arranged vertically to enhance the connection stability between the pressure seat 31 and the side panel 2. The second fastener 7 can be a commonly used locking bolt. Through the above arrangement, the stability of the entire test device can be greatly improved.

[0065] Example 3

[0066] The present embodiment provides a static pressure strength failure test device for thin-walled pipe fittings, which is used to clamp a thin-walled pipe fitting 1 and perform a static pressure strength failure test. The test device of the present embodiment includes a pair of side plates 2, each of which is provided with a clamping assembly 3 for clamping the thin-walled pipe fitting 1, and the clamping assembly 3 clamps the thin-walled pipe fitting 1 between the two side plates 2, and at least one connecting rod 4 is horizontally connected between the two side plates 2.

[0067] The difference from the first embodiment is that the two ends of the connecting rod 4 of the present embodiment pass through the side plates 2 of the corresponding sides respectively, and the passing part is provided with external threads, which can be threadedly connected by the third fastener 8 on the outside of the side plate to be fastened and installed on the side plate 2. The third fastener 8 can be a commonly used hexagonal nut.

[0068] Furthermore, the number of connecting rods 4 in this embodiment is two, and the two connecting rods 4 are at the same horizontal height and are symmetrically arranged about the thin-walled pipe 1 to ensure that the testing device of this embodiment does not deform in the axial direction of the thin-walled pipe 1 during the static pressure destruction process, thereby ensuring the effectiveness and safety of the test.

[0069] Example 4

[0070] The present embodiment provides a static pressure strength failure test device for thin-walled pipe fittings, which is used to clamp a thin-walled pipe fitting 1 and perform a static pressure strength failure test. The test device of the present embodiment includes a pair of side plates 2, each of which is provided with a clamping assembly 3 for clamping the thin-walled pipe fitting 1, and the clamping assembly 3 clamps the thin-walled pipe fitting 1 between the two side plates 2, and at least one connecting rod 4 is horizontally connected between the two side plates 2.

[0071] like Figure 4-5As shown, the clamping assembly 3 of this embodiment includes a coaxially arranged pressurizing seat 31 and a locking member 32. The pressurizing seat 31 horizontally penetrates the side plate 2, and a multi-step step structure is axially provided in the pressurizing seat 31 for the end of the thin-walled pipe 1 to be inserted, and the two ends of the thin-walled pipe 1 are respectively inserted into the corresponding multi-step step structure. Specifically, the pressurizing seat 31 includes a coaxially arranged first annular structure 311 and a second annular structure 312. The first annular structure 311 is arranged on the inner side of the side plate 2 and has an outer diameter greater than that of the second annular structure 312, and the locking member 32 is threadedly engaged with the inner wall of the first annular structure 311. The second annular structure 312 penetrates the side plate 2 and partially extends to the outside of the side plate 2. In the above-mentioned multi-step step structure, a first step is formed between the first annular structure 311 and the second annular structure 312, and a second step and a third step are sequentially provided in the second annular structure 312.

[0072] The locking member 32 of this embodiment is sleeved on the thin-walled pipe 1, and specifically includes an integrally formed threaded portion 321 and a locking portion 322. The threaded portion 321 can be threadedly matched with the first annular structure 311 of the pressurizing seat 31, and the locking portion 322 can drive the threaded portion 321 to threadably match with the first annular structure 311 with the assistance of an external tool, thereby playing a locking role. After the threaded portion 321 of the locking member 32 is threadedly matched with the first annular structure 311, it can abut against the first step, thereby playing a limiting role.

[0073] The clamping assembly 3 of this embodiment further includes a gasket 33 and a sealing member 34 which are sleeved on the end of the thin-walled pipe 1. Figure 6 As shown, the gasket 33 is arranged in the second annular structure 312 and is adapted to the shape of the second step in the second annular structure 312. The sealing member 34 forms a surface contact with the gasket 33 and can abut against the third step. The sealing member 34 is in a compressed state under the pressure of the gasket 33 to achieve a better sealing effect. The sealing member 34 of this embodiment can be a commonly used O-ring, and can be made of rubber or nitrile material.

[0074] In this embodiment, after the high-pressure liquid is introduced, the outer surface of the thin-walled pipe 1 is coaxially matched with the multi-step structure surface of the pressurizing seat 31 and the seal 34, and a dynamic sealing cavity is formed between the end of the thin-walled pipe 1 and the bottom of the multi-step structure in the pressurizing seat 31. The coaxial matching can eliminate the stress concentration caused by assembly and other factors to ensure the authenticity of the test results, and the dynamic sealing can eliminate the test error caused by the axial force of the thin-walled pipe 1 due to the Poisson effect under the internal pressure.

[0075] Example 5

[0076] This embodiment provides a thin-walled pipe static pressure strength failure test device and a specific test method. The test device of this embodiment specifically includes an O-ring (i.e., seal 34), a gasket 33, a pressurizing seat 31, a locking nut (i.e., locking member 32), a side plate 2, a bottom plate 6, a screw (i.e., a connecting rod 4), and common fasteners such as a hexagonal bolt (i.e., a first fastener 5), a locking bolt (i.e., a second fastener 7), and a hexagonal nut (i.e., a third fastener 8). The test device of this embodiment can be used for SiC pipes with an outer diameter of 5-30mm, a wall thickness of 0.5-3mm, and a length of 20-4000mm. f Static pressure strength destructive tests were carried out on thin-walled tubes made of carbon fiber reinforced resin, aluminum alloy, corundum, C / C composite materials, and zirconium.

[0077] In this embodiment, the pressurizing seat 31, the gasket 33, the locking member 32, the thin-walled pipe 1 and the sealing member 34 are coaxial. After the high-pressure liquid is introduced through the pressure inlet 11, the outer surface of the thin-walled pipe 1 is coaxially matched with the surface of the internal step of the pressurizing seat 31 and the sealing member 34, and a dynamic sealing cavity of about 2-5 mm is formed between the end of the thin-walled pipe 1 and the bottom of the multi-step structure in the pressurizing seat 31 (such as Figure 2 As shown in (d), the dynamic sealing cavity can give the two ends of the thin-walled pipe 1 a certain axial movement space. The coaxial fit can eliminate the stress concentration caused by assembly and other factors to ensure the authenticity of the test results. The dynamic seal can eliminate the detection error caused by the axial force of the thin-walled pipe 1 due to the Poisson effect under the internal pressure. The O-ring of this embodiment can be made of rubber or nitrile material, and the materials of the remaining parts are stainless steel. The locking piece 32 and the pressurizing seat 31 are threadedly matched, and the gasket 33 is used for transition. The thin-walled pipe 1 and the seal 34 are fixed to the tooling by tightening the threads, and the seal 34 is given a certain amount of compression to achieve a better sealing effect.

[0078] The side plate 2 of this embodiment is fixed to the bottom plate 6 by hexagonal bolts. The pressure seat 31 penetrates the side plate 2 from the inside of the side plate 2, and is matched with the opening on the side plate 2 through clearance. A threaded hole is opened in the middle of the top of the side plate 2, and the pressure seat 31 is fixed to the side plate 2 by a locking bolt. The connecting rod 4 passes through the side plate 2 and is connected to the hexagonal nut on the outside of the side plate 2. By tightening the hexagonal nut, it is ensured that the tooling does not deform in the axial direction of the thin-walled pipe 1 during the static pressure destruction process.

[0079] In this embodiment, SiC f / SiC composite material thin-walled tube was used as an example to conduct static pressure strength destructive test. The specific test method is as follows:

[0080] (1) Sample loading:

[0081] Fix the side plate 2 to the bottom plate 6 with hexagonal bolts, insert one end of the thin-walled pipe 1 into the seal 34, the washer 33 and the locking piece 32 in sequence, and then penetrate into the inner side of the side plate 2, tighten the locking piece 32 to fix the SiC f The / SiC composite pipe fitting is fixed on the pressurizing seat 31, and the locking bolt is tightened from the threaded hole above the side plate 2 to fix the pressurizing seat 31 axially. The thin-walled pipe fitting 1 at the other end is fixed in the same way. The connecting rod 4 passes through the side plate 2 and is connected to the hexagonal nut outside the side plate 2. The hexagonal nut is tightened to ensure that the tooling does not deform in the axial direction of the thin-walled pipe fitting 1 during the static pressure destruction process.

[0082] (2) Test:

[0083] Connect the pressure inlet 11 to the external pressure source interface, and then place the test device in the safety cover. Turn on the switch and pass high-pressure liquid. When the pressure rises to 1.8MPa, SiC f Water droplets seep out from the outside of the SiC composite pipe, indicating that SiC f There are voids inside the / SiC composite pipe, and its static pressure failure strength is 1.8MPa.

[0084] Example 6

[0085] This embodiment provides a static pressure strength destructive test device and a specific test method for thin-walled pipe fittings. The difference from Embodiment 5 is that this embodiment performs a static pressure strength destructive test on aluminum alloy pipe fittings.

[0086] The pressure inlet 11 is connected to the external pressure source interface, and then the test device is placed in the safety cover. The switch is turned on, and high-pressure liquid is introduced. When the pressure rises to 38MPa, it is found that the aluminum alloy pipe expands from the inside to the outside, which indicates that the static pressure breaking strength of the aluminum alloy pipe is 38MPa.

[0087] Through Examples 5-6 of the present invention, it is proved that the static pressure strength destruction test device for thin-walled pipe fittings of the present invention can meet the static pressure strength destruction test of thin-walled pipe fittings 1, and can be used as a universal testing device for thin-walled pipe fittings.

[0088] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A static pressure strength failure test device for thin-walled brittle pipe fittings, used for clamping thin-walled brittle pipe fittings (1) with a wall thickness of 0.5-3 mm and performing static pressure strength failure test, characterized in that: It comprises a pair of side plates (2), each of the side plates (2) being provided with a clamping assembly (3) for clamping a thin-walled brittle pipe (1), the clamping assembly (3) clamping the thin-walled brittle pipe (1) between the two side plates (2), and at least one connecting rod (4) being horizontally connected between the two side plates (2); The clamping assembly (3) comprises a coaxially arranged pressurizing seat (31) and a locking member (32); the pressurizing seat (31) horizontally penetrates the side plate (2) and is provided with a multi-step structure along the axial direction for the end of the thin-walled brittle pipe (1) to be inserted, and the two ends of the thin-walled brittle pipe (1) are respectively inserted into the corresponding multi-step structure; the locking member (32) is sleeved on the thin-walled brittle pipe (1) and is threadably matched with the pressurizing seat (31); The pressurizing seat (31) comprises a first annular structure (311) and a second annular structure (312) which are coaxially arranged; the first annular structure (311) is arranged on the inner side of the side plate (2) and has an outer diameter larger than that of the second annular structure (312); the locking member (32) is threadedly engaged with the inner wall of the first annular structure (311); the second annular structure (312) penetrates the side plate (2) and partially extends to the outer side of the side plate (2); in the multi-step step structure, a first step is formed between the first annular structure (311) and the second annular structure (312), and a second step and a third step are sequentially arranged in the second annular structure (312); the locking member (32) can abut against the first step after threadedly engaging with the first annular structure (311); The clamping assembly (3) further comprises a gasket (33) and a sealing member (34) sleeved on the end of the thin-walled brittle pipe (1); the gasket (33) is arranged in the second annular structure (312) and is adapted to the shape of the step structure in the second annular structure (312); the sealing member (34) is in contact with the gasket (33) and can abut against the third step, and the sealing member (34) is in a compressed state under the pressure of the gasket (33); One of the pressurizing seats (31) is axially penetrated and used to input high-pressure liquid to the corresponding end of the thin-walled brittle tube (1), and the corresponding end of the thin-walled brittle tube (1) is provided with a corresponding pressure inlet (11); after the high-pressure liquid is introduced, the outer surface of the thin-walled brittle tube (1) is coaxially matched with the surface of the internal step of the pressurizing seat (31) and the sealing member (34), and a dynamic sealing cavity is formed between the end of the thin-walled brittle tube (1) and the bottom of the multi-step structure in the pressurizing seat (31), thereby providing a certain amount of movable space at both axial ends of the thin-walled brittle tube (1).

2. A static pressure strength failure test device for thin-walled brittle pipes according to claim 1, characterized in that: The side panels (2) are mounted on the bottom panel (6) via first fasteners (5), and the pressure seat (31) is fastened and mounted on the side panels (2) via second fasteners (7).

3. The static pressure strength destructive testing device for thin-walled brittle pipes according to claim 1 is characterized in that: Both ends of the connecting rod (4) pass through the side plates (2) on the corresponding sides respectively and are mounted on the side plates (2) via third fasteners (8).

4. The static pressure strength failure testing device for thin-walled brittle pipes according to claim 1 is characterized in that: The number of the connecting rods (4) is two, and the two connecting rods (4) are at the same level and are symmetrically arranged with respect to the thin-walled brittle pipe (1).

5. The static pressure strength destructive testing device for thin-walled brittle pipes according to claim 1 is characterized in that: The locking member (32) comprises an integrally formed threaded portion (321) and a locking portion (322), wherein the threaded portion (321) can be threadably matched with the pressurizing seat (31).

6. A method for testing the static pressure strength of thin-walled pipes, characterized in that: The static pressure strength destruction testing device for thin-walled brittle pipes according to any one of claims 1 to 5 is used, which specifically comprises the following steps: S1: The thin-walled brittle pipe (1) to be tested is clamped and fixed between two side plates (2) by a clamping assembly (3); S2: connecting the pressure inlet (11) of the thin-walled brittle pipe (1) to an external pressure source and introducing high-pressure liquid; S3: Observe the state change of the thin-walled brittle pipe (1) as the pressure increases, and confirm the static pressure breaking strength of the thin-walled brittle pipe (1).

7. The static pressure strength destructive testing method for thin-walled pipes according to claim 6, characterized in that: The thin-walled brittle tube (1) is SiC f One of the thin-walled tubes made of carbon fiber reinforced resin, aluminum alloy tubes, corundum thin-walled tubes, C / C composite thin-walled tubes, carbon fiber reinforced resin composite thin-walled tubes and zirconium thin-walled tubes.

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