Landing gear carbon disc tube expanding and stretching test tool

Abstract

The utility model discloses landing gear carbon disc pipe expansion and drawing test tool, this test tool includes: pull rod, it includes integrative connection's connecting section and expansion and drawing section, and the connecting section is connected with first connecting rod, and the expansion and drawing section is equipped with the axle head in the one end away from the connecting section, and the axle head is equipped with the expansion and drawing piece, and sets up locking piece and locks the relative position of expansion and drawing piece and axle head, and the guide assembly includes guide seat and pressure -bearing block, and the pressure -bearing block is connected in the first end of guide seat, and the second end of guide seat is connected with second connecting rod, and the pressure -bearing block is equipped with the guide hole, and the guide seat is equipped with the test cavity that is communicated in the guide hole, and the expansion and drawing section of pull rod passes through the guide hole and extends to the test cavity. The present technology provides a kind of special expansion and drawing test tool of landing gear carbon disc pipe expansion, after using this test tool, tensile testing machine can open the distance between pull rod and guide seat by two clamps, to meet the condition of expansion and drawing test to pipe expansion test piece.

Description

Technical Field

[0001] This utility model relates to the technical field of aerospace manufacturing, and in particular to a landing gear carbon disc expansion and stretching test fixture. Background Technology

[0002] One of the key components of an aircraft is its landing gear, and a crucial part of the landing gear is the expander. The structure of the expander is as follows: Figure 1 As shown, the expansion tube bears the load and medium pressure of the landing gear under conditions such as takeoff, landing, and taxiing.

[0003] In order to verify the performance of the tube expander, it is necessary to set expansion test conditions by simulating the expansion of the tube throughout its entire life cycle in actual use, so as to examine the deformation performance of the tube expander radially to the specified diameter and to show its defects.

[0004] To conduct expansion tests, using specialized expansion test fixtures can achieve twice the result with half the effort. However, the existing technology does not disclose the fixtures related to expansion tests of landing gear carbon discs. Utility Model Content

[0005] The present invention aims to provide a landing gear carbon disc expansion and stretching test fixture to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0006] According to a first aspect embodiment of the present invention, the landing gear carbon disc expansion and stretching test fixture includes:

[0007] A pull rod includes an integrally connected connecting section and an expanding section. The connecting section is connected to a first connecting rod. The expanding section is used to fit into the inner hole of an expanding tube specimen. The expanding tube specimen has a straight section and an outwardly expanding flared mouth. The expanding section has a shaft head at one end away from the connecting section. The shaft head is fitted with an expanding member, and a locking member is provided to lock the relative position of the expanding member and the shaft head. The radial dimension of the expanding section is smaller than the inner diameter of the straight section, and the expanding member has a radial dimension larger than the inner diameter of the straight section.

[0008] A guide assembly includes a guide seat and a pressure block. The pressure block is connected to a first end of the guide seat, and a second connecting rod is connected to a second end of the guide seat. The pressure block has a guide hole, and the guide seat has a test cavity communicating with the guide hole. The expansion section of the pull rod passes through the guide hole and extends into the test cavity. The radial dimension of the test cavity is greater than the outer diameter of the flared mouth, and the radial dimension of the guide hole is smaller than the outer diameter of the straight section.

[0009] The landing gear carbon disc expansion and stretching test fixture according to the present invention has at least the following beneficial effects: In use, the expansion section of the pull rod is sequentially inserted into the guide hole of the pressure block and the inner hole of the expansion specimen, so that the shaft end of the expansion section is close to the flared end of the expansion specimen. After that, the expansion piece is inserted into the shaft end of the expansion section and locked with the locking piece. Then, the expansion section connected with the expansion specimen is placed into the test cavity of the guide seat, and the pressure block and the guide seat are assembled. Finally, the first connecting rod of the pull rod and the second connecting rod of the guide seat are respectively connected to the two clamps of the tensile testing machine. Compared with the prior art, the present invention provides a special expansion and stretching test fixture for landing gear carbon disc expansion. After using the test fixture, the tensile testing machine can open the distance between the pull rod and the guide seat through the two clamps, thereby meeting the conditions for expanding and stretching the expansion specimen. The test fixture has a simple structure, is easy to operate, has stable performance, and is easy to mass produce.

[0010] According to some embodiments of the present invention, the expanding member is provided with a central hole that can be fitted into the shaft head, and the expanding member has a variable radial dimension and a smooth transition surface connecting different radial dimensions.

[0011] According to some embodiments of this utility model, the shape of the expanding member includes a sphere, a hemisphere, an ellipsoid, a semi-ellipsoid, or a frustum.

[0012] According to some embodiments of the present invention, when the pressure-bearing block is connected to the first end of the guide seat, the center line of the guide hole is coaxial with the center line of the test chamber.

[0013] According to some embodiments of the present invention, the shaft head has a screw, and the locking member is provided with an internal thread that cooperates with the screw.

[0014] According to some embodiments of the present invention, the guide seat has a built-in heater, which is used to heat the test chamber.

[0015] According to some embodiments of this utility model, the guide seat has a built-in temperature detector.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the existing expansion tube structure;

[0019] Figure 2This is a schematic diagram of the structure of the landing gear carbon disc expansion and stretching test fixture provided in this embodiment of the utility model.

[0020] In the attached diagram: 100-pull rod, 200-guide assembly, 110-connecting section, 120-expansion section, 111-first connecting rod, 11-straight section, 12-flare mouth, 10-expansion tube specimen, 121-shaft head, 300-expansion component, 310-locking component, 210-guide seat, 220-pressure block, 211-second connecting rod, 221-guide hole, 212-test chamber, 400-heater, 213-heating chamber, 410-first mounting component, 214-detection chamber, 500-temperature detector, 510-second mounting component. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0022] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0025] like Figure 2As shown, the landing gear carbon disc expansion test fixture according to the first aspect of this utility model includes a tie rod 100 and a guide assembly 200. As an expansion test fixture, the tie rod 100 and the guide assembly 200 are ultimately connected to two clamps of a tensile testing machine (not shown in the figures). In this embodiment, the tensile testing machine can be an electronic universal tensile testing machine to facilitate measurement readings. During operation, the upper clamp of the tensile testing machine moves away from the lower clamp in the vertical direction, thereby increasing the distance between the tie rod 100 and the guide assembly 200.

[0026] Therefore, the tie rod 100 includes an integrally formed connecting section 110 and an expansion section 120. The connecting section 110 is provided with a first connecting hole, and a first connecting rod 111 is connected to the first connecting hole. The upper clamp of the tensile testing machine controls the position of the tie rod 100 by connecting with the first connecting rod 111.

[0027] The structure of the expansion tube is as follows Figure 1 As shown, it has a straight segment 11 and an outwardly expanding flared opening 12, the radial dimension of the flared opening 12 being larger than the radial dimension of the straight segment 11, and the radial dimension on the straight segment 11 being equal everywhere. For example... Figure 2 As shown, since the expansion section 120 of the tie rod 100 needs to be fitted into the inner hole of the expansion tube specimen 10, the radial dimension of the expansion section 120 cannot be greater than the inner diameter of the straight section 11 of the expansion tube specimen 10. Since the connecting section 110 is the force-bearing end, and the radial dimension of the expansion section 120 is limited by the expansion tube specimen 10, in order to enhance the structural strength of the connecting section 110, the radial dimension of the connecting section 110 must be greater than the radial dimension of the expansion section 120.

[0028] Specifically, the expanding section 120 is a long rod, longer than the connecting section 110. At the end of the expanding section 120 furthest from the connecting section 110, a shaft head 121 is provided. The shaft head 121 has a threaded rod, and its radial dimension is smaller than that of the expanding section 120, naturally forming a shoulder at the connection between the shaft head 121 and the expanding section 120. The threaded rod allows the expanding member 300 to be fitted into it. After the threaded rod is fitted into the expanding member 300, a locking member 310 with internal threads locks the relative position of the expanding member 300 and the shaft head 121, ensuring that the expanding member 300 remains in contact with the shoulder. In this embodiment, the locking member 310 can be a locking nut.

[0029] The expanding member 300 has a central hole through which the screw can pass. The expanding member 300 has a varying radial dimension and a smooth transition surface connecting different radial dimensions. In this embodiment, the shape of the expanding member 300 includes, but is not limited to, a sphere, a hemisphere, an ellipsoid, a semi-ellipsoid, or a frustum. Since the expanding member 300 is used to expand the straight segment 11 of the expanding tube specimen 10, the expanding member 300 has a radial dimension larger than the inner diameter of the straight segment 11. However, the maximum radial dimension of the expanding member 300 is not greater than the maximum inner diameter of the flared opening 12, so that the expanding member 300 can smoothly enter the flared opening 12 and use the flared opening 12 as the starting point to expand the straight segment 11.

[0030] The expander 300 has varying radial dimensions to allow expansion of the straight segment 11 of the expander specimen 10 from a single-dimensional surface during the expansion test. This effectively reduces the stress-bearing area of ​​the expander specimen 10. According to the pressure formula, to achieve the same pressure, a smaller stress-bearing area requires less tensile force, thus preventing the tie rod 100 from breaking or the expander specimen 10 from tearing due to excessive tensile force. If the expander 300 had sharp edges, it would damage the expander specimen 10 during the expansion test and cause stress concentration and other problems.

[0031] Among the shapes listed above, the shape of the expanding member 300 is preferably selected as a hemisphere. The hemisphere not only has the advantages of the sphere being easy to measure and process, but also has a plane that abuts against the locking member 310 to enhance the stability of the expanding member 300 when subjected to force.

[0032] However, this utility model does not specifically limit the shape of the expanding member 300. As long as the expanding member 300 can expand the straight segment 11 of the expanding tube test piece 10, the expanding member 300 is within the protection scope of this utility model, regardless of its shape.

[0033] On the other side, the guide assembly 200 includes a guide seat 210 and a pressure block 220. The first end of the guide seat 210 has a mounting hole for fixed connection with the pressure block 220, and the second end of the guide seat 210 has a second connecting hole. A second connecting rod 211 is connected to the second connecting hole. The lower clamp of the tensile testing machine controls the position of the guide seat 210 by connecting to the second connecting rod 211. If the guide seat 210 is arranged vertically, then its first end refers to the upper end, and its second end refers to the lower end.

[0034] The pressure block 220 is provided with a guide hole 221, the radial dimension of which is almost equal to the radial dimension of the expansion section 120. When the expansion section 120 of the tie rod 100 is inserted into the guide hole 221, the guide hole 221 provides a guide for the expansion section 120 to limit the direction of movement of the tie rod 100. Before conducting the expansion test, the expansion tube specimen 10 and the test fixture need to be assembled. During assembly, the expansion section 120 of the tie rod 100 is sequentially inserted into the guide hole 221 of the pressure block 220 and the inner hole of the expansion tube specimen 10, so that the shaft end 121 of the expansion section 120 is close to the flared mouth 12 of the expansion tube specimen 10. After that, the expansion member 300 is inserted into the shaft end 121 of the expansion section 120 and locked with the locking member 310. Since the radial dimension of the guide hole 221 is smaller than the outer diameter of the straight section 11 of the expanded tube specimen 10, when the pull rod 100 is pulled outward from the guide hole 221 of the pressure block 220, the straight section 11 of the expanded tube specimen 10 can maintain contact with the pressure block 220. At this time, the pull rod 100, the expanded pull member 300, the locking member 310, the expanded tube specimen 10 and the pressure block 220 together constitute an assembly.

[0035] Correspondingly, the guide seat 210 is provided with a test cavity 212 communicating with the guide hole 221. The radial dimension of the test cavity 212 is larger than the outer diameter of the bell mouth 12. That is to say, the test cavity 212 of the guide seat 210 can accommodate the entire expansion tube specimen 10. Before conducting the expansion test, the pressure block 220 and the guide seat 210 need to be assembled. During assembly, the assembly consisting of the tie rod 100, the expansion member 300, the locking member 310, the expansion tube specimen 10, and the pressure block 220 is inserted into the test cavity 212 of the guide seat 210. Since the pressure block 220 cannot enter the test cavity 212, only the expansion tube specimen 10, the expansion member 300, the locking member 310, and part of the expansion section 120 enter the test cavity 212. The pressure block 220 is fixedly connected to the guide seat 210 through the connector, thereby realizing the assembly of the expansion tube specimen 10 and the test fixture.

[0036] With the above structure, when the tensile testing machine pulls the distance between the pull rod 100 and the guide seat 210 apart through the upper clamp, the pull rod 100 applies an upward force to the bell mouth 12 of the expanded tube specimen 10 through the expanding member 300. Since the pressure block 220 is fixedly connected to the guide seat 210, and the guide seat 210 has a fixed position under the connection of the lower clamp, the pressure block 220 needs to withstand the upward pulling force of the expanded tube specimen 10 driven by the pull rod 100. Since the expanding member 300 is located in the inner hole of the expanded tube specimen 10, the distance between the pull rod 100 and the guide seat 210 can drive the expanding member 300 to expand the straight segment 11 of the expanded tube specimen 10 in a direction away from the bell mouth 12, thereby simulating the expansion situation of the expanded tube throughout its entire life cycle during actual use, and different test conditions can be set by changing the dimensional parameters of the expanding member 300.

[0037] It should be noted that when the pressure block 220 is connected to the first end of the guide seat 210, the center line of the guide hole 221 is coaxial with the center line of the test chamber 212, so as to prevent the upper and lower clamps of the tensile testing machine from generating destructive torque on the test fixture during the tensile test.

[0038] In some embodiments of this invention, in order to simulate the temperature conditions after aircraft braking, two test modes are established. One is a test mode under natural conditions, and the other is a test mode simulating the high-temperature environment generated after aircraft braking, with a temperature of 150°C to 200°C. The above embodiments are sufficient for simulating the natural environment, but for simulating the high-temperature environment, a heater 400 is required to heat the guide seat 210.

[0039] Specifically, the guide seat 210 is provided with a heating chamber 213. A first mounting member 410 is connected to the inlet of the heating chamber 213. The first mounting member 410 is used to install the heater 400 so that the heater 400 can extend into the heating chamber 213. In this embodiment, the heater 400 can be a conventional resistance heating device or other types of heating devices, without special requirements or limitations. When it is necessary to simulate a high-temperature environment, the heater 400 is powered to generate heat, which is transferred from the heating chamber 213 to the test chamber 212, thereby heating the test chamber 212 to a specified temperature, and thus simulating the high-temperature environment after aircraft braking.

[0040] Generally speaking, when conducting experiments, the natural environment should be tested first, followed by the high-temperature environment. This can save the waiting time for the test equipment to cool down.

[0041] To detect the temperature of the test chamber 212, the guide seat 210 is also provided with a detection chamber 214. A second mounting component 510 for mounting a temperature detector 500 is connected to the entrance of the detection chamber 214, allowing the temperature detector 500 to extend into the detection chamber 214. In this embodiment, the temperature detector 500 can be a conventional thermocouple or other type of temperature sensor, without special requirements. Although the temperature detector 500 does not directly detect the temperature of the test chamber 212, it can indirectly obtain the temperature of the test chamber 212 through calibration.

[0042] Of course, in some other embodiments, the heater 400 and / or temperature detector 500 may also be directly disposed in the test chamber 212, and are not limited to the above embodiments. However, since the test chamber 212 is susceptible to various adverse effects during the test due to the expansion tube specimen 10 not meeting material requirements, it is best to isolate the electronic control components from the test chamber 212 to avoid damage to the electronic control components.

[0043] It is understood that this utility model does not limit the specific structure of the first mounting component 410 and the second mounting component 510, nor does it limit their placement. The first mounting component 410 and the second mounting component 510 can be adhesive seats, threaded seats, card seats, etc., and can be placed in different positions according to the characteristics of the electronic control components, rather than necessarily at the entrance of the cavity.

[0044] The tube expansion and stretching test method according to the second aspect of the present invention, which applies the landing gear carbon disc tube expansion and stretching test fixture according to the first aspect of the present invention, includes the following steps:

[0045] I. Preparatory Stage

[0046] S100. Based on the structural characteristics of the expansion tube component, select a suitable expansion tube specimen 10. The number of expansion tube specimens 10 shall be at least 3. Record the expansion tube specimen 10 number, expansion tube parameters (expansion amount, material grade, etc.) and initial dimensions (gauge length diameter, length) of the expansion tube specimen 10.

[0047] The S200 tensile testing machine's range must cover the expected maximum load of the expanded tube specimen. An electronic universal tensile testing machine with a range of 0-1000 kN and an accuracy of ±1% can be selected, and prior calibration is required to ensure the metrology certificate is valid. Depending on the material properties, stress control (e.g., 0.00025 / s to 0.0025 / s) or displacement control (e.g., 1 mm / min to 10 mm / min) should be used to ensure uniform load application. Finally, the testing environment should be selected at 23℃±5℃ and humidity 50%±10% to avoid environmental factors affecting the test results.

[0048] II. Assembly Stage

[0049] S300. Insert the expansion section 120 of the pull rod 100 into the guide hole 221 of the pressure block 220 and the inner hole of the expansion tube specimen 10 in sequence, so that the shaft head 121 of the expansion section 120 is close to the flared mouth 12 of the expansion tube specimen 10. Then, insert the expansion member 300 into the shaft head 121 and lock the relative position of the expansion member 300 and the shaft head 121 with the locking member 310 to prevent the expansion member 300 from loosening during the test.

[0050] S400. The assembly consisting of the tie rod 100, the expansion member 300, the locking member 310, the expansion tube specimen 10, and the pressure block 220 is inserted into the test cavity 212 of the guide seat 210. Since the pressure block 220 cannot enter the test cavity 212, only the expansion tube specimen 10, the expansion member 300, the locking member 310, and part of the expansion section 120 enter the test cavity 212. The pressure block 220 is fixedly connected to the guide seat 210 through the connector, thereby realizing the assembly of the expansion tube specimen 10 and the test fixture.

[0051] S500. Adjust the position of the clamps of the tensile testing machine so that the two clamps of the tensile testing machine are respectively connected to the first connecting rod 111 of the tie rod 100 and the second connecting rod 211 of the guide seat 210. Since the position of the lower clamp of the tensile testing machine remains unchanged, when installing the testing fixture, first connect the second connecting rod 211 of the guide seat 210 to the lower clamp, and then adjust the position of the upper clamp so that the upper clamp can connect to the first connecting rod 111 of the tie rod 100, and ensure that the axis of the expanded tube specimen 10 is coaxial with the tensile force direction of the tensile testing machine, with a deviation of ≤1°, to avoid additional bending stress.

[0052] III. Experiment Preparation Stage

[0053] S600. Open the tensile testing machine testing system software, select the expansion test module, input the diameter parameters of the expansion part 300 according to the actual product, and select the moving speed during tensioning. First, apply a small load (about 5% of the expected yield load), check whether the expansion tube specimen 10 is aligned and whether the extensometer is working properly, and eliminate the gap between the expansion tube specimen 10 and the fixture. After everything is normal, start the test.

[0054] IV. Room Temperature Test Phase

[0055] S700. Continuously load at the set rate, and record the load (kN) and displacement (mm) or strain (%) data in real time. Divide the length of the expanded tube specimen 10 into four equal test lengths, and perform segmented tensile tests on the four test lengths using the tensile testing machine. The tensile test is performed in four expansion stages, pausing once after each stage reaches 1 / 4 of the expanded tube specimen 10's length. Record the tensile force and moving speed of the tensile testing machine during the four tensile tests.

[0056] S800. If the tensile testing machine maintains a uniform tensile force and moving speed in each expansion test segment, the expanded tube specimen 10 is deemed a qualified specimen; otherwise, it is deemed an unqualified specimen. The expansion test should be completed according to the test requirements, and the expanded tube specimen 10 should not exhibit defects such as cracks or bending. A qualified expanded tube can maintain a constant speed (e.g., 1 mm / min) throughout the entire expansion test, from start to finish, and the tensile force value should not change significantly. If the moving speed of the measured data remains consistent, but the tensile force value fluctuates beyond the threshold, it indicates that the performance distribution of the expanded tube specimen 10 is too large, its performance is unstable, and its use is unstable; therefore, it should be deemed unqualified.

[0057] V. High Temperature Test Phase

[0058] S900. Heater 400 is connected to the power supply to heat up the test fixture. The temperature of the test fixture is monitored by temperature detector 500 until it reaches 200°C and is kept at that temperature for 10 minutes. After the temperature stabilizes, the test can begin.

[0059] S1000. Continuously load at the set rate, and record the load (kN) and displacement (mm) or strain (%) data in real time. Divide the length of the expanded tube specimen 10 into four equal test lengths, and perform segmented tensile tests on the four test lengths using the tensile testing machine. The tensile test is performed in four expansion stages, pausing once after each stage reaches 1 / 4 of the expanded tube specimen 10's length. Record the tensile force and moving speed of the tensile testing machine during the four tensile tests.

[0060] S1100. If the tensile testing machine maintains a uniform tensile force and moving speed in each expansion test segment, the expanded tube specimen 10 is deemed a qualified specimen; otherwise, it is deemed an unqualified specimen. The expansion test should be completed according to the test requirements, and the expanded tube specimen 10 should not exhibit defects such as cracks or bending. A qualified expanded tube can maintain a constant speed (e.g., 1 mm / min) throughout the entire expansion test, from the start to the end, and the tensile force value should not change significantly. If the moving speed of the measured data remains consistent, but the tensile force value fluctuates beyond the threshold, it proves that the performance distribution of the expanded tube specimen 10 is too large, its performance is unstable, and its use is unstable; therefore, it should be deemed unqualified.

[0061] It is understandable that, in addition to dividing the length of the expanded tube specimen 10 into four equal test lengths, the number of equal segments can be expanded to three, five, or six segments, etc., and is not limited to the above embodiment. Alternatively, unequal division can be used, that is, dividing the length of the expanded tube specimen 10 into multiple segments of different test lengths. However, this operation significantly increases the difficulty of the test and is influenced by subjective factors, making it suitable for special tests but not universally applicable.

[0062] Since the tube expansion and stretching test method adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be repeated here.

[0063] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A landing gear carbon disc expansion and stretching test fixture, characterized in that, include: A pull rod (100) includes an integrally connected connecting section (110) and an expanding section (120). The connecting section (110) is connected to a first connecting rod (111). The expanding section (120) is used to fit into the inner hole of an expanding tube specimen (10). The expanding tube specimen (10) has a straight section (11) and an outwardly expanding flared mouth (12). The expanding section (120) has a shaft head (121) at one end away from the connecting section (110). The shaft head (121) is fitted with an expanding member (300) and a locking member (310) is provided to lock the relative position of the expanding member (300) and the shaft head (121). The radial dimension of the expanding section (120) is smaller than the inner diameter of the straight section (11), and the expanding member (300) has a radial dimension larger than the inner diameter of the straight section (11). A guide assembly (200) includes a guide seat (210) and a pressure block (220). The pressure block (220) is connected to a first end of the guide seat (210), and a second connecting rod (211) is connected to a second end of the guide seat (210). The pressure block (220) has a guide hole (221), and the guide seat (210) has a test chamber (212) communicating with the guide hole (221). The expansion section (120) of the pull rod (100) passes through the guide hole (221) and extends into the test chamber (212). The radial dimension of the test chamber (212) is greater than the outer diameter of the flared mouth (12), and the radial dimension of the guide hole (221) is smaller than the outer diameter of the straight section (11).

2. The landing gear carbon disc expansion and stretching test fixture according to claim 1, characterized in that: The expanding member (300) has a central hole that can be fitted into the shaft head (121), and the expanding member (300) has a varying radial dimension and a smooth transition surface connecting different radial dimensions.

3. The landing gear carbon disc expansion and stretching test fixture according to claim 2, characterized in that: The shape of the expansion member (300) includes a sphere, a hemisphere, an ellipsoid, a semi-ellipsoid, or a frustum.

4. The landing gear carbon disc expansion and stretching test fixture according to claim 1, characterized in that: When the pressure block (220) is connected to the first end of the guide seat (210), the center line of the guide hole (221) is coaxial with the center line of the test chamber (212).

5. The landing gear carbon disc expansion and stretching test fixture according to claim 1, characterized in that: The shaft head (121) has a screw, and the locking member (310) has an internal thread that mates with the screw.

6. The landing gear carbon disc expansion and stretching test fixture according to claim 1, characterized in that: The guide seat (210) has a built-in heater (400) for heating the test chamber (212).

7. The landing gear carbon disc expansion and stretching test fixture according to claim 6, characterized in that: The guide seat (210) has a built-in temperature detector (500).

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