High-temperature stress endurance testing device for aviation pipeline connecting piece

Abstract

The invention belongs to the technical field of pipeline tests, and particularly relates to a high-temperature stress endurance testing device for an aviation pipeline connecting piece. The device comprises a tensile testing machine, a high-temperature environment box and a video extensometer, the tensile testing machine comprises a stand column and an upper moving platform sliding on the stand column, the upper moving platform is connected with an upper straight-through connector of a pipeline test piece through an upper switching unit, and a transverse plate at the bottom end of the stand column is connected with a lower straight-through connector of the pipeline test piece through a lower switching unit. Hydraulic oil flow channels are arranged in the upper adapter unit and the lower adapter unit, one end of each hydraulic oil flow channel is connected with a pipeline of the pipeline test piece, and the other end is connected with the pump set unit; the high-temperature environment box sleeves the pipeline test piece and is used for providing a high-temperature environment; the video extensometer is located outside the high-temperature environment box and collects deformation data of the pipeline test piece in the test process through a transparent temperature-resistant glass window of the high-temperature environment box. The application can more accurately simulate and reproduce the use condition of the aviation pipeline piece in the high-temperature environment.

Description

Technical Field

[0001] This application belongs to the field of pipeline testing technology, specifically relating to a high-temperature stress endurance testing device for aviation pipeline connectors. Background Technology

[0002] Piping connections are a crucial component of aircraft design, widely used in hydraulic, fuel, and lubricating systems. The piping system provides energy to these systems, and the performance of piping connections significantly impacts aircraft performance. Performance qualification tests for piping connections include pressure resistance, air pressure leakage, constant stress bending fatigue, pulse testing, system pressure testing, and burst testing. However, except for the pulse and burst pressure tests, which were conducted at a maximum temperature of 135°C according to Type II temperature classification (-55°C to 135°C) specified in GJB456, all other tests were performed at room temperature. With the increasing performance requirements and cruise speeds of aircraft, the temperature of the entire fuselage surface and cabin areas has significantly increased, rising above 200°C, and even reaching 400°C. Existing testing requirements are no longer sufficient for aircraft operation.

[0003] Connection strength test and bending fatigue test represent the safety and reliability of pipeline system use, respectively. Existing pipeline connection strength test is carried out under normal temperature conditions. The test process is to stretch the component at a constant rate until the pipeline component fails, and the connection strength value is determined. Existing test equipment and test methods have the disadvantages of not being able to measure and monitor strength under high temperature conditions, and ignoring the influence of working time under high temperature conditions on material performance degradation and creep, and failing to accurately characterize the actual use condition. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a high-temperature stress endurance testing device for aviation pipeline connectors. This device can both heat and continuously monitor the temperature of pipeline connector components, and test information such as deformation, performance degradation, pressure drop, and stress endurance time of pipeline components while maintaining a high temperature, thus providing performance data support for the application of high-temperature pipeline systems.

[0005] The high-temperature stress endurance testing device for aviation pipeline connections provided in this application mainly includes:

[0006] A tensile testing machine includes a column and an upper moving platform that slides on the column. The upper moving platform is connected to the upper straight connector of the pipeline test piece via an upper adapter unit. The horizontal plate at the bottom of the column is connected to the lower straight connector of the pipeline test piece via a lower adapter unit. Both the upper adapter unit and the lower adapter unit have hydraulic oil channels. One end of the hydraulic oil channel is connected to the pipeline of the pipeline test piece, and the other end is connected to a pump unit via a hose.

[0007] A high-temperature environment chamber, fitted onto a pipeline test piece, is used to provide a high-temperature environment. The high-temperature environment chamber has a transparent, heat-resistant glass window.

[0008] The video extensometer is located outside the high-temperature environmental chamber and collects deformation data of the pipeline test specimen during the test through the transparent heat-resistant glass window.

[0009] Preferably, the upper adapter unit and the lower adapter unit have the same structure, both including a platform adapter, a tension adapter cylinder and a tension hydraulic head. One end of the platform adapter is fixed below the upper moving platform or above the horizontal plate at the bottom of the column, and the other end is connected to the tension adapter cylinder.

[0010] The bottom of the stretching adapter has a groove, and the side of the groove has a notch. One end of the stretching hydraulic head has a stretching threaded adapter. The screw head of the stretching threaded adapter enters the groove through the notch to rotate with the stretching adapter.

[0011] The hydraulic oil passage of the upper or lower adapter unit is an L-shaped hydraulic passage, which is located inside the tensile hydraulic head. The L-shaped hydraulic passage has an internal thread at the end of the tensile hydraulic head that connects to the pipeline test piece, for threaded connection with the upper or lower straight connector. The other end of the L-shaped hydraulic passage is located inside the protruding plug on the side of the tensile hydraulic head, which has an external thread for threaded connection with the hose of the pump unit.

[0012] Preferably, the platform adapter has a sleeve at one end, and the tension adapter cylinder has a column at one end that can extend into the sleeve. Both the sleeve and the column have holes, and the platform adapter and the tension adapter cylinder are connected by a through tension adapter pin.

[0013] Preferably, the root of the internal thread has a tapered contraction opening, and one end of the upper or lower straight connector has a tapered sealing end. When the L-shaped hydraulic passage is threadedly connected to the upper or lower straight connector, sealing is achieved by compression between the tapered contraction opening and the tapered sealing end.

[0014] Preferably, the upper straight connector and the lower straight connector have the same structure, both including a conical sealing end for connecting to the upper or lower adapter unit, and a variable end for connecting to the pipeline test piece. The variable end has an inner conical surface at its end and a step at its bottom. A sleeve is fixed to the end of the conduit of the pipeline test piece. One end of the sleeve is a first outer conical surface that mates with the inner conical surface of the variable end, and the other end of the sleeve is a second outer conical surface that mates with an outer nut. The outer nut is threaded to the outside of the variable end. The variable end also has a shape memory alloy connector inside. One end of the shape memory alloy connector abuts against the step at the bottom of the variable end, and the other end extends into the conduit of the pipeline test piece. The outer wall of the shape memory alloy connector also has an outer ring step surface that abuts against the end of the conduit. The shape memory alloy connector is configured to expand upon heating, so that the inner wall of the conduit is pressed together to form a compressive force.

[0015] Preferably, the end of the conduit is connected to the unflared tube sleeve by a rolling connection process.

[0016] Preferably, a hydraulic oil recovery unit is provided outside the connection between the lower adapter unit and the lower straight connector. The hydraulic oil recovery unit includes a recovery tray with protrusions in the middle and around the periphery to form an annular cavity. The middle protrusion has a through hole for penetrating the end of the stretching hydraulic head of the lower adapter unit and is sealed to the stretching hydraulic head by a rubber sealing ring.

[0017] This application can more accurately simulate and reproduce the operating conditions of aviation piping components under high-temperature environments; shape memory alloys are added to the non-observation end to strengthen the local connection strength, ensuring that the test piping components do not leak or pull-out within the observation window; the test components can be heated in a high-temperature environment chamber according to the test requirements; and hydraulic oil can be recovered to prevent contamination of the test equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a preferred embodiment of the high-temperature stress endurance testing device for aviation pipeline connectors of this application.

[0019] Figure 2 This application Figure 1 The illustrated embodiment is a structural schematic diagram without a high-temperature environment chamber.

[0020] Figure 3 This is a schematic diagram of the video extensometer observation window.

[0021] Figure 4 This is a schematic diagram of the upper connection unit structure.

[0022] Figure 5 This is a schematic diagram of the structure of a tension hydraulic head.

[0023] Figure 6 This is a schematic diagram of the unit structure of the test component.

[0024] Figure 7 This is a schematic diagram of the upper straight connector structure.

[0025] Figure 8 Schematic diagram of hydraulic oil recovery unit structure

[0026] Among them, 1-tensile testing machine, 11-upper moving platform, 100-transparent heat-resistant glass window;

[0027] 2-Video extensometer;

[0028] 3-High Temperature Environment Chamber;

[0029] 4-Pump unit;

[0030] 5-Upper adapter unit, 7-Lower adapter unit, 51-Platform adapter, 52-Tension adapter pin, 53-Tension adapter cylinder, 54-Tension threaded adapter, 55-Tension hydraulic head, 551-Blind hole internal thread, 552-External thread, 553-Side conical surface, 554-Conical contraction opening, 555-Internal thread, 556-L-shaped hydraulic flow channel

[0031] 6-Pipeline test piece; 61-Upper straight connector; 62-Lower straight connector; 63-Test body; 611-Variable end; 612-Conical sealing end; 631-Outer nut; 632-Pipe sleeve; 633-Conduit; 64-Shape memory alloy connector;

[0032] 8-Hydraulic oil recovery unit, 81-Recovery tray, 82-Rubber seal ring Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0034] This application provides a high-temperature stress endurance testing device for aviation pipeline connections, such as... Figures 1-4 and Figure 6 As shown, it mainly includes:

[0035] Tensile testing machine 1 includes a column and an upper moving platform 11 that slides on the column. The upper moving platform 11 is connected to the upper straight connector 61 of the pipeline test piece 6 through an upper adapter unit 5. The horizontal plate at the bottom of the column is connected to the lower straight connector 62 of the pipeline test piece 6 through a lower adapter unit 7. Both the upper adapter unit 5 and the lower adapter unit 7 have hydraulic oil channels. One end of the hydraulic oil channel is connected to the pipeline of the pipeline test piece 6, and the other end is connected to the pump unit 4 through a hose.

[0036] A high-temperature environment chamber 3 is fitted onto the pipeline test piece 6 to provide a high-temperature environment. The high-temperature environment chamber 3 has a transparent heat-resistant glass window 100.

[0037] The video extensometer 2 is located outside the high-temperature environmental chamber 3 and collects the deformation data of the pipeline test piece 6 during the test through the transparent heat-resistant glass window 100.

[0038] In addition to including the pipeline test piece 6, the high-temperature environment chamber 3 of this application can also include the lower part of the upper adapter unit 5 and the upper part of the lower adapter unit 7, so as to realize the overall temperature adjustment of the pipeline test piece 6. The high-temperature environment chamber has a front transparent heat-resistant glass window 100, and the deformation and strain of the pipeline test piece 6 can be observed through the video extensometer 2.

[0039] In this embodiment, the tensile testing machine 1 has a vertical structure. The upper adapter unit 5 is connected to the upper moving platform 11 of the tensile testing machine 1. The upper moving platform 11 is driven by a drive mechanism (conventional structure, not shown) to move linearly up and down in the slide rail of the column to provide tensile force to the pipeline test piece 6. The pump unit is connected to the pipeline test piece 6 through a hose and the hydraulic oil channels in the upper adapter unit 5 and the lower adapter unit 7 to realize the flow of hydraulic oil and the transmission of pressure, and to monitor the internal pressure changes of the pipeline components in real time.

[0040] In some alternative implementations, such as Figure 4 and Figure 5 As shown, the upper adapter unit 5 and the lower adapter unit 7 have the same structure, both including a platform adapter 51, a tension adapter cylinder 53 and a tension hydraulic head 55. One end of the platform adapter 51 is fixed below the upper moving platform 11 or above the horizontal plate at the bottom of the column, and the other end is connected to the tension adapter cylinder 53.

[0041] The bottom of the stretching adapter cylinder 53 has a groove, and the side of the groove has a notch. One end of the stretching hydraulic head 55 has a stretching threaded adapter 54. The screw head of the stretching threaded adapter 54 enters the groove through the notch to rotate with the stretching adapter cylinder 53.

[0042] The hydraulic oil flow channel of the upper adapter unit 5 or the lower adapter unit 7 is an L-shaped hydraulic flow channel 556, which is set inside the tensile hydraulic head 55. The L-shaped hydraulic flow channel 556 has an internal thread 555 at one end of the tensile hydraulic head 55 that connects to the pipeline test piece 6, for threaded connection with the upper straight connector 61 or the lower straight connector 62. The other end of the L-shaped hydraulic flow channel 556 is located in the plug protruding from the side of the tensile hydraulic head 55. The plug has an external thread 552 for threaded connection with the hose of the pump unit 4.

[0043] This embodiment illustrates the specific connection method between the platform adapter 51 and the stretching adapter cylinder 53. The stretching adapter cylinder 53 has interconnected slots on its side wall and bottom. Each slot includes a stepped notch on the side wall and a straight opening on the bottom. The stretching threaded adapter 54 is a stepped shaft-shaped structure. Its upper end is stepped and is inserted into the slot of the stretching adapter cylinder 53, locking it within the cylinder for connection. Its lower end has a threaded structure and is threadedly connected to the upper stretching hydraulic head 55.

[0044] This embodiment achieves a rotatable connection between the platform adapter 51 and the tensile hydraulic head 55, giving the pipeline test piece 6 rotational freedom and preventing factors such as vibration during the test from applying torque to the pipeline test piece 6. Furthermore, this application constructs the hydraulic oil passage of the pipeline test piece 6 based on the tensile hydraulic head 55.

[0045] It should also be noted that the hydraulic oil flow channel provided by the upper adapter unit 5 or the lower adapter unit 7 is an L-shaped hydraulic flow channel 556, so as to form a plug with external threads 552 on the side for connection with the hose, such as... Figure 5 As shown, the top of the upper adapter unit 5 or the bottom of the lower adapter unit 7 is provided with a blind hole internal thread 551, which is not connected to the L-shaped hydraulic flow channel 556. The blind hole internal thread 551 is connected to the external thread of the tension thread adapter for bearing.

[0046] In some alternative implementations, such as Figure 4 As shown, the platform adapter 51 has a sleeve at one end, and the tension adapter cylinder 53 has a column at one end that can extend into the sleeve. Both the sleeve and the column have holes, and the platform adapter 51 and the tension adapter cylinder 53 are connected by a through tension adapter pin 52.

[0047] In this embodiment, the platform adapter 51 is connected to the upper moving platform 11 by a thread, and the lower end is a hollow cylindrical structure containing two through holes that are perpendicular to each other. The platform adapter 51 is connected to the tension adapter cylinder 53 by a tension adapter pin 52 that passes through the through hole.

[0048] In some alternative embodiments, the root of the internal thread 555 has a tapered contraction opening 554, and one end of the upper straight connector 61 or the lower straight connector 62 has a tapered sealing end 612. When the L-shaped hydraulic flow channel 556 is threadedly connected to the upper straight connector 61 or the lower straight connector 62, sealing is achieved by compression between the tapered contraction opening 554 and the tapered sealing end 612.

[0049] In this embodiment, the tapered constriction port 554 and the tapered sealing end 612 have a taper of 74°, effectively achieving a seal between the connecting structures. In addition, the protruding plug end of the tension hydraulic head 55 has a lateral tapered surface 553, also with a taper of 74°, to achieve a sealed connection with the hose.

[0050] In some alternative implementations, such as Figure 7 As shown, the upper straight connector 61 and the lower straight connector 62 have the same structure, both including a conical sealing end 612 for connecting to the upper adapter unit 5 or the lower adapter unit 7, and a variable end 611 for connecting to the pipeline test piece 6. The variable end 611 has an inner conical surface at its end and a step at its bottom. The conduit 633 of the pipeline test piece 6 is fixed with a sleeve 632. In some optional embodiments, the end of the conduit 633 is connected to the sleeve 632 without flaring by a rolling connection process. One end of the sleeve 632 is connected to the inner conical surface of the variable end 611. The first outer conical surface is mated with the sleeve 632, and the other end of the sleeve 632 is a second outer conical surface that mates with the outer nut 631. The outer nut 631 is threaded to the outside of the variable end 611. The variable end 611 also has a shape memory alloy connector 64 inside. One end of the shape memory alloy connector 64 abuts against the step at the bottom of the variable end 611, and the other end extends into the conduit 633 of the pipeline test piece 6. The outer wall of the shape memory alloy connector 64 also has an outer ring step surface that abuts against the end of the conduit 633. The shape memory alloy connector 64 is configured to expand after heating, so that the inner wall of the conduit 633 is pressed together to form a compressive force.

[0051] In this embodiment, the upper straight connector 61 and the lower straight connector 62 are specially made connectors, including a variable end 611 and a conical sealing end 612. The variable end 611 can be adjusted and replaced according to the specifications of the test conduit 633. The 74° conical sealing end 612 is connected to the upper and lower tensile hydraulic heads, and its size and specifications are fixed.

[0052] The conduit 633 is connected to the unflared sleeve 632 via a rolling connection process, during which the inner diameter of the conduit 633 is slightly increased. The shape memory alloy connector 64 is placed inside the conduit 633 and has a hollow thin-walled structure. The outer diameter of the thin wall at one end is approximately the same as the inner diameter of the conduit 633 and is inserted into the conduit 633. The insertion depth matches the deformation area of ​​the inner diameter during the rolling connection. The outer wall of the shape memory alloy connector 64 has a shoulder structure, namely an outer ring stepped surface, which is used to limit the contact with the end of the conduit 633 after the end is inserted into the conduit 633.

[0053] The other end of the shape memory alloy connector 64 of this application contacts or maintains a small gap with the bottom step of the variable end 611 of the specially designed straight connector, ensuring that the shape memory alloy body is located inside the conduit during the test. Under normal temperature conditions, both ends of the shape memory alloy connector 64 do not contact the inner wall of the conduit or the inner wall of the specially designed straight connector. After reaching the test temperature, the shape memory alloy connector expands after exceeding the "phase change temperature". The end located inside the conduit 633 expands and fits tightly against the inner wall of the conduit, forming a compressive force. The other end does not contact the specially designed straight connector, so as to ensure that the end with the shape memory alloy does not pull off or leak first during the stress endurance tensile test, and that pull-off and leakage occur within the observation window.

[0054] In some alternative implementations, such as Figure 8 As shown, a hydraulic oil recovery unit 8 is provided outside the connection between the lower adapter unit 7 and the lower straight connector 62. The hydraulic oil recovery unit 8 includes a recovery tray 81. The recovery tray 81 has a central and peripheral protrusion to form an annular cavity. The central protrusion has a through hole for penetrating the end of the tension hydraulic head 55 of the lower adapter unit 7 and is sealed to the tension hydraulic head 55 through a rubber sealing ring 82.

[0055] In this embodiment, the upper end of the opening of the recycling tray is a slope, and the inner side is flush with the upper surface of the lower stretching hydraulic head. After the hydraulic oil flows down, it enters the recycling tray along the slope.

[0056] The test methods of this application include:

[0057] a) Connect the pipeline test piece to the upper and lower transfer units respectively, and connect it to the hydraulic oil recovery unit;

[0058] b) Connect the upper adapter unit to the pump unit via the upper adapter unit and the lower adapter unit to the pump unit via the lower adapter unit.

[0059] c) Evacuate the pipeline test specimen using the pump unit and supply oil to the specified test pressure;

[0060] d) Raise the temperature of the pipeline test specimen to the specified operating temperature using a high-temperature environmental chamber, and maintain the temperature to ensure uniformity of the pipeline test specimen temperature;

[0061] e) The deformation and leakage of the pipeline test specimen within the observation window are monitored using a video extensometer;

[0062] f) Apply the axial load specified in the technical conditions to the pipeline test specimen using a tensile testing machine, and keep the load constant;

[0063] g) Record the time when the pipeline test piece shows obvious deformation and leakage, clean the hydraulic oil in the recovery tray, and the test ends.

[0064] Compared with traditional connection strength testing methods, it has the following advantages:

[0065] 1) It can more accurately simulate and reproduce the operating conditions of aviation pipeline components under high temperature environment; 2) Shape memory alloy is added to the non-observation end to strengthen the local connection strength and ensure that the test pipeline components do not leak or pull-out within the observation window; 3) The test components can be heated in a high temperature environment chamber according to the test requirements; 4) Hydraulic oil can be recovered to prevent contamination of the test equipment.

[0066] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An aircraft tubing connection high temperature stress-rupture testing apparatus, characterized by, The utility model relates to a pipeline test device, which comprises: a tensile testing machine (1) including a column and an upper moving platform (11) sliding on the column, the upper moving platform (11) is connected with the upper straight joint (61) of a pipeline test piece (6) through an upper adapter unit (5), the bottom end transverse plate of the column is connected with the lower straight joint (62) of the pipeline test piece (6) through a lower adapter unit (7), the upper adapter unit (5) and the lower adapter unit (7) are provided with hydraulic oil flow channels, one end of the hydraulic oil flow channels is connected with the pipeline of the pipeline test piece (6), and the other end is connected with a pump group unit (4) through a hose; a high-temperature environment box (3) sleeved on the pipeline test piece (6) for providing a high-temperature environment, the high-temperature environment box (3) is provided with a transparent temperature-resistant glass window (100); a video extensometer (2) located outside the high-temperature environment box (3) and collecting deformation data of the pipeline test piece (6) during the test through the transparent temperature-resistant glass window (100).

2. The aircraft conduit connection high temperature stress-rupture testing device of claim 1, wherein, The upper adapter unit (5) and the lower adapter unit (7) are the same in structure and each include a platform adapter (51), a tensile adapter cylinder (53) and a tensile hydraulic head (55), one end of the platform adapter (51) is fixed below the upper moving platform (11) or above the bottom end transverse plate of the column, and the other end is connected with the tensile adapter cylinder (53); the tensile adapter cylinder (53) is provided with a clamping groove in the bottom, the side of the clamping groove is provided with an opening, one end of the tensile hydraulic head (55) is provided with a tensile threaded adapter (54), the screw head of the tensile threaded adapter (54) enters the clamping groove from the opening to be rotationally connected with the tensile adapter cylinder (53); the hydraulic oil flow channel of the upper adapter unit (5) or the lower adapter unit (7) is an L-shaped hydraulic flow channel (556) arranged in the tensile hydraulic head (55), the L-shaped hydraulic flow channel (556) is provided with an internal thread (555) in the end of the tensile hydraulic head (55) connected with the pipeline test piece (6) and is used for being threadedly connected with the upper straight joint (61) or the lower straight joint (62), the other end of the L-shaped hydraulic flow channel (556) is located in the plug protruding from the side of the tensile hydraulic head (55) and is provided with an external thread (552) for being threadedly connected with the hose of the pump group unit (4).

3. The aerospace tubing connection high temperature stress-rupture testing apparatus of claim 2, wherein, the end of the platform adapter (51) is provided with a sleeve, the end of the tensile adapter cylinder (53) is provided with a column body capable of extending into the sleeve, the sleeve and the column body are both provided with holes, and the platform adapter (51) and the tensile adapter cylinder (53) are connected through a tensile adapter pin (52) penetrating the holes.

4. The aircraft conduit connection high temperature stress-rupture testing device of claim 2, wherein, the root of the internal thread (555) is provided with a tapered shrinkage opening (554), one end of the upper straight joint (61) or the lower straight joint (62) is provided with a tapered sealing end (612), and when the L-shaped hydraulic flow channel (556) is threadedly connected with the upper straight joint (61) or the lower straight joint (62), the tapered shrinkage opening (554) and the tapered sealing end (612) are extruded to be sealed.

5. The aerospace tubing connection high temperature stress-rupture testing apparatus of claim 1, wherein, The upper through joint (61) and the lower through joint (62) are structurally identical, both including a tapered sealing end (612) for connecting with the upper adapter unit (5) or the lower adapter unit (7), and a variable end (611) for connecting with the pipeline test piece (6), the variable end (611) has an inner tapered surface at the end, and the variable end (611) has a step at the bottom, the guide pipe (633) of the pipeline test piece (6) is fixed with a sleeve (632) at the end, one end of the sleeve (632) is a first outer tapered surface matched with the inner tapered surface of the end of the variable end (611), the other end of the sleeve (632) is a second outer tapered surface matched with the outer sleeve nut (631), the outer sleeve nut (631) is threadedly connected outside the variable end (611), and the variable end (611) further has a memory alloy joint (64) inside, one end of the memory alloy joint (64) abuts against the step at the bottom of the variable end (611), the other end of the memory alloy joint (64) extends into the guide pipe (633) of the pipeline test piece (6), and the outer wall of the memory alloy joint (64) further has an outer ring step surface abutting against the end of the guide pipe (633), the memory alloy joint (64) is configured to expand after being heated to adhere to the inner wall of the guide pipe (633) and form an extrusion force.

6. The aerospace tubing connection high temperature stress-rupture testing apparatus of claim 5, wherein, The end of the guide pipe (633) is connected with the unexpanding sleeve (632) through a rolling connection process.

7. The aerospace tubing connection high temperature stress-rupture testing apparatus of claim 1, wherein, The lower adapter unit (7) is provided with a hydraulic oil recovery unit (8) outside the connection with the lower through joint (62), the hydraulic oil recovery unit (8) includes a recovery tray (81), the middle and periphery of the recovery tray (81) are protruded to form an annular disc cavity, the middle protrusion has a through hole for penetrating the end of the stretching hydraulic head (55) of the lower adapter unit (7) and being sealingly connected with the stretching hydraulic head (55) through a rubber sealing ring (82).

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