A tensile bending and thermal stress combined test device and method

Abstract

The present invention discloses a combined tensile, bending, and thermal stress test device and method, belonging to the field of material testing technology. The device includes a support frame provided with a mechanical tensile device and a three-point bending device; the mechanical tensile device includes a first sliding base, a second sliding base, a bidirectional threaded rod, a first clamping assembly, and a second clamping assembly; the middle portions of the first sliding base and the second sliding base are connected to the bidirectional threaded rod via a threaded structure; the top ends of the first sliding base and the second sliding base are fixedly connected with the first clamping assembly and the second clamping assembly, respectively; the sample is fixed between the first clamping assembly and the second clamping assembly, and the tensile force of the sample is detected by rotating the bidirectional threaded rod; the three-point bending device is provided at the top of the support frame, and the bending force of the sample is detected by pressing down on the three-point bending device. The present invention conducts a combined tensile-bending-thermal stress aging test on a hot-melt adhesive bonded sample under set conditions to examine the performance of the hot-melt adhesive layer under long-term operating conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of material testing, and in particular to a tensile bending and thermal stress combined testing device and method. Background Art

[0002] The frequent occurrence of buffer layer ablation failures of corrugated aluminum sheathed cables in China in recent years has brought opportunities for the development of smooth aluminum sheathed cables. Research on smooth aluminum sheathed high-voltage / ultra-high-voltage XLPE cables has also become a hot topic in the field of power transmission cables. In order to ensure the mechanical properties of smooth aluminum sheathed cables, the aluminum layer and the non-metallic outer sheath must be tightly and firmly bonded. Among them, the hot melt adhesive used to bond the two plays a vital role. The hot melt adhesive bonds the aluminum layer and the non-metallic outer sheath to form a whole, significantly improving the overall bending, compression, and tensile properties of the cable. In order to adapt to the actual operation needs of the cable, the hot melt adhesive must not only achieve effective bonding, but also have sufficient heat resistance and anti-aging properties to ensure the long-term operation reliability of the smooth aluminum sheathed cable. This is the key to current related research.

[0003] Existing technical problems:

[0004] 1. Currently, there is limited research on hot melt adhesives for smooth aluminum-sheathed cables. This research typically focuses solely on the room-temperature bonding strength of hot melt adhesives, without examining the impact of other factors on the adhesive's bonding strength and the cable's bending performance. In actual high-voltage cable operation, varying installation environments and line operating conditions can affect the adhesive's bonding quality and the cable's mechanical properties.

[0005] 2. Current aging research only considers a single factor and mainly studies the performance of hot melt adhesives through artificial accelerated aging methods. It cannot simulate the long-term combined effects of tensile, bending and thermal stresses that the hot melt adhesive is subjected to between the aluminum layer and the non-metallic outer sheath during the operation of actual smooth aluminum sheathed cables.

[0006] 3. Currently, there is no test device or test method suitable for simultaneously applying tensile-bending-thermal stress to hot melt adhesive bonding specimens. Summary of the Invention

[0007] In order to address the deficiencies in the prior art, the present invention provides an aging test device and a test method for subjecting smooth aluminum sheathed cable hot melt adhesive bonding samples to a combined tensile-bending-thermal stress aging test. Based on the typical cable laying and operating environment, a combined tensile-bending-thermal stress aging test is carried out on the hot melt adhesive bonding samples under set conditions to test whether the hot melt adhesive layer is damaged or falls off under the combined tensile-bending-thermal stress of simulating the long-term operating conditions of high-voltage smooth aluminum sheathed XLPE cables.

[0008] The present invention adopts the following technical solutions.

[0009] The first aspect of the present invention discloses a combined tensile bending and thermal stress test device, comprising a support frame, wherein the support frame is provided with a mechanical tensile device and a three-point bending device; the mechanical tensile device is used to detect tensile force, and comprises a first sliding base, a second sliding base, a bidirectional threaded rod, a first clamping assembly and a second clamping assembly, the middle parts of the first sliding base and the second sliding base are connected to the bidirectional threaded rod through a threaded structure, the top ends of the first sliding base and the second sliding base are fixedly connected with the first clamping assembly and the second clamping assembly respectively, the sample is fixed between the first clamping assembly and the second clamping assembly, and the tensile force of the sample is detected by rotating the bidirectional threaded rod; the three-point bending device is arranged at the top of the support frame, and the bending force of the sample is detected by pressing down the three-point bending device.

[0010] Preferably, the mechanical stretching device further comprises a slideway, which passes through both ends of the first sliding base and the second sliding base respectively and is fixed to the support base of the support frame.

[0011] Preferably, the three-point bending device includes a cylinder and a pressure head. The cylinder is fixed to the middle of the top of the support frame. The driving end of the cylinder is fixedly connected to the pressure head. When the cylinder is started, the pressure head is driven downward to press the sample.

[0012] Preferably, the mechanical stretching device further comprises a nut, one end of the bidirectional threaded rod is fixedly connected to the nut, and the nut is rotatably connected to one end of the support seat.

[0013] Preferably, the bidirectional threaded rod is rotated by rotating the nut, and the threads on both sides of the bidirectional threaded rod rotate in opposite directions, synchronously driving the first sliding base and the second sliding base to move closer to or away from each other.

[0014] Preferably, the first sliding base and the second sliding base are embedded with tension sensors, and the tension value of the sample is monitored by the tension sensors.

[0015] Preferably, the first clamping assembly includes a first lower pressing plate, a sliding frame, a first knob and a first upper pressing plate;

[0016] One side of the first lower pressing plate is fixedly connected to the sliding frame, the top of the sliding frame is connected to the knob through a threaded structure, and the bottom of the first knob is rotatably connected to the first upper pressing plate.

[0017] Preferably, the second clamping assembly includes a second lower pressing plate, a limiting frame, a second knob and a second upper pressing plate;

[0018] One side of the second lower pressing plate is connected to the limiting frame, the top of the limiting frame is connected to the knob through a threaded structure, and the bottom of the second knob is rotatably connected to the second upper pressing plate.

[0019] Preferably, the second clamping assembly further includes bolts, and the height of the lower pressing plate of the second clamping assembly can be adjusted according to the size of the bonding sample, and is fixed to the limiting frame by the bolts.

[0020] The second aspect of the present invention discloses a combined tensile bending and thermal stress test method, based on the combined tensile bending and thermal stress test device, comprising the following steps:

[0021] According to the length of the bonding sample, rotate the bidirectional threaded rod to adjust the first sliding base and the second sliding base to an appropriate position, and fix the bonding sample between the first clamping assembly and the second clamping assembly;

[0022] The bidirectional threaded rod is rotated to apply the set shear stress to the sample according to the tensile force value monitored by the tensile sensor embedded in the sliding base to detect the tensile force of the sample;

[0023] Start the three-point bending device, apply bending stress to the sample to make it reach the required bending radius, and test the bending force of the sample;

[0024] Place the device with the bonded sample in an oven at a preset temperature. After a preset time, remove the device from the oven and remove the bonded sample from the device.

[0025] After standing at room temperature, the samples were subjected to a bonding strength test to obtain the tensile bending and thermal stress test results of the samples.

[0026] Compared with the prior art, the beneficial effects of the present invention include at least:

[0027] The present invention proposes an aging test device and a test method for subjecting smooth aluminum sheathed cable hot melt adhesive bonding samples to a combined tensile-bending-thermal stress aging test. Based on the typical cable laying and operating environment, a combined tensile-bending-thermal stress aging test is carried out on the hot melt adhesive bonding samples under set conditions to test whether the hot melt adhesive layer is damaged or falls off under the combined tensile-bending-thermal stress of simulating the long-term operating conditions of high-voltage smooth aluminum sheathed XLPE cables, so as to verify its long-term performance.

[0028] 1. It can ensure that the horizontal force and tensile stress of the sample are adjustable: the bonding sample is clamped and fixed by a clamping assembly with an adjustable lower pressure plate height to ensure that only horizontal shear stress is applied to the bonding sample. At the same time, by rotating the two-way threaded rod to adjust the position of the clamping assembly, the shear stress on the bonding sample can be controlled to meet different test requirements.

[0029] 2. Different bending stresses can be applied to the specimen: After the bonded specimen is effectively fixed by the clamping assembly, the pressure head can be moved vertically downward by the cylinder to a set distance, thereby applying different bending stresses to the specimen, so that the specimen can be bent at three points according to the set bending radius to meet different test requirements.

[0030] 3. Tensile and bending stresses can be applied to the sample at the same time: After the bonded sample is effectively fixed by the clamping assembly, the set shear stress is applied to the sample through the bidirectional threaded rod; on this basis, the cylinder is used to press the pressure head vertically downward to apply bending stress to the sample; through the above operation, tensile and bending stresses can be applied to the sample at the same time.

[0031] 4. Simultaneous application of tensile, bending, and thermal stresses to the specimen: After effectively securing the bonded specimen with the clamping assembly, a bidirectional threaded rod applies a set shear stress to the specimen. Furthermore, a cylinder forces the pressure head downward vertically to apply bending stress to the specimen. The specimen-clamping device is placed in an oven at different temperatures to subject the specimen to thermal stress. Through these operations, tensile, bending, and thermal stresses can be applied simultaneously to the specimen.

[0032] 5. This device solves the clamping problem for bonding samples and can apply tensile, bending and thermal stress to the samples individually or simultaneously. It effectively solves the problem that the existing technology cannot simultaneously achieve stretching, bending and heating of bonding samples to evaluate the stress and aging performance of the smooth aluminum-sheathed cable adhesive layer. It provides strong support for comprehensively evaluating the performance of hot melt adhesives under test conditions that are more in line with the actual operating conditions of the cable.

[0033] 6. In addition to bonding specimens, the device can also be used for other single or composite metal and non-metal specimens. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of the test device of the present invention;

[0035] Figure 2 Schematic diagram of the structure of the first clamping assembly in the test device of the present invention;

[0036] Figure 3 Schematic diagram of the structure of the second clamping assembly in the test device of the present invention;

[0037] Figure 4 This is a schematic diagram of the test device of the present invention for bonding specimens;

[0038] 1. Support frame; 2. Slide; 3. First sliding base; 4. Second sliding base; 5. Bidirectional threaded rod; 6. Nut; 7. First clamping assembly; 8. Second clamping assembly; 9. Cylinder; 10. Press head; 71. First lower pressure plate; 72. Sliding frame; 73. First knob; 74. First upper pressure plate; 81. Second lower pressure plate; 82. Second knob; 83. Limiting frame; 84. Second upper pressure plate; 85. Bolt; 11. Bonding specimen. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] The embodiment of the present invention discloses a tensile bending and thermal stress combined test device, comprising a support frame 1, wherein a mechanical tensile device and a three-point bending device are provided inside the support frame;

[0041] like Figure 1-2 As shown, the mechanical stretching device includes a slide 2, a first sliding base 3, a second sliding base 4, a bidirectional threaded rod 5, a nut 6, a first clamping assembly 7 and a second clamping assembly 8. The slide 2 passes through the two ends of the first sliding base 3 and the second sliding base 4 respectively, and is fixed to both sides of the top surface of the support base of the support frame 1. The middle parts of the first sliding base 3 and the second sliding base 4 are connected to the bidirectional threaded rod 5 through a threaded structure. One end of the bidirectional threaded rod 5 is fixedly connected to the nut 6, and the nut 6 is rotatably connected to one end of the support base;

[0042] The tops of the first sliding base 3 and the second sliding base 4 are respectively fixedly connected with a first clamping assembly 7 and a second clamping assembly 8. The first clamping assembly 7 includes a first lower pressing plate 71, a sliding frame 72, a first knob 73 and a first upper pressing plate 74. One side of the first lower pressing plate 71 is fixedly connected to the sliding frame 72. The top of the sliding frame 72 is connected to the knob 73 through a threaded structure. The bottom of the knob 73 is rotatably connected to the first upper pressing plate 74.

[0043] like Figure 3 As shown, the second clamping assembly 8 includes a second lower pressing plate 81, a bolt 85, a limiting frame 83, a second knob 82 and a second upper pressing plate 84. One side of the second lower pressing plate 84 is fixedly connected to the limiting frame 83 by a bolt 85. The top of the limiting frame 83 is connected to the knob 82 through a threaded structure. The bottom of the knob 82 is rotatably connected to the second upper pressing plate 84.

[0044] The three-point bending device includes a cylinder 9 and a pressure head 10. The cylinder 9 is fixed to the middle of the top end of the support frame 1, and the driving end of the cylinder 9 is fixedly connected to the pressure head 10.

[0045] Another embodiment of the present invention provides a combined tensile bending and thermal stress test method, comprising the following steps:

[0046] Step 1: According to the length of the bonding sample, rotate the bidirectional threaded rod 5 to adjust the first sliding base 3 and the second sliding base 4 to the appropriate position, operate the first knob 73 to fix the bonding sample to the first clamping assembly 7, adjust the second clamping assembly lower pressure plate 82 to the appropriate height, and operate the second knob 82 to fix the bonding sample to the test device;

[0047] Step 2: Rotate the bidirectional threaded rod 5 to apply a set shear stress to the sample according to the tension value monitored by the tension sensor embedded in the sliding base;

[0048] Step 3: Start the cylinder 9 to drive the pressure head 10 downward to apply bending stress to the sample to achieve the required bending radius;

[0049] Step 4: placing the device with the bonded sample in an oven at a specific temperature. After a preset time, the device is removed from the oven and the bonded sample is removed from the device.

[0050] Step 5: After standing at room temperature for 24 hours, the sample is subjected to a bonding strength test.

[0051] Example 1:

[0052] Reference Figure 4 This example provides a tensile stress-thermal stress combined aging platform for the hot melt adhesive layer of a smooth aluminum sheathed cable.

[0053] Adjust the height of the second clamping assembly's lower pressure plate 81 according to the size of the adhesive specimen 11 and secure it to the limit frame 83 with bolts 85. Rotate the bidirectional threaded rod 5 to adjust the first and second sliding bases 3 and 4 to the appropriate position. Place the ends of the adhesive specimen to be aged on the lower pressure plates of the first and second clamping assemblies 7 and 8, respectively, and clamp and secure the specimen using the operating knobs. Rotate the bidirectional threaded rod 5 to adjust the shear force applied to the adhesive specimen based on the tensile force measured by the tensile force sensor embedded in the sliding bases.

[0054] The device with the bonded sample installed is placed in an oven at a specific temperature. After a preset time, the device is taken out of the oven and the bonded sample is removed from the device. After standing at room temperature for 24 hours, the sample is subjected to a bonding strength test.

[0055] One end of the bidirectional threaded rod 5 is fixedly connected to a nut 6, and the nut is rotated to connect one end of the support seat. By rotating the nut, the bidirectional threaded rod is driven to rotate. The threads on both sides of the bidirectional threaded rod rotate in opposite directions, thereby synchronously driving the first sliding base 3 and the second sliding base 4 to move closer to or away from each other.

[0056] Tension sensors are fixedly installed in the first sliding base 3 and the second sliding base 4. The shear force generated by the corresponding first clamping assembly 7 and the second clamping assembly 8 on the bonding sample is monitored by the tension sensors, which facilitates the control of the shear force exerted on the bonding sample.

[0057] It is worth noting that the special design of the clamping assembly in the present invention can be adapted to the shape of the bonding specimen to avoid vertical stress, such as Figure 4 As shown in the figure, the bonding sample is to bond two plate-like materials together by hot melt adhesive, and for the convenience of clamping, the two ends of the plate-like materials are bonded. Figure 4 During clamping, the second lower plate 81 should be higher than the first lower plate 71 by a height equal to the thickness of the plate plus the hot-melt adhesive. This prevents the hot-melt adhesive from being subjected to additional stress. The hot-melt adhesive is typically 0.2-0.4mm thick, the outer sheath is approximately 3mm thick, and the aluminum sheath is approximately 2.35mm thick. This asymmetry of the left and right clamping components allows for adjustable misalignment, preventing stress perpendicular to the bonding surface and causing additional damage to the bonded specimen, which could distort test results.

[0058] Example 2:

[0059] Reference Figure 4 ,This example provides a bending-thermal stress combined aging platform for the hot melt adhesive layer of a smooth aluminum sheathed cable.

[0060] Adjust the height of the second clamping assembly's lower pressure plate 81 according to the size of the bonding specimen and secure it in place with bolts 85. Rotate the bidirectional threaded rod 5 to adjust the first and second sliding bases 3 and 4 to the desired position. Place the ends of the bonding specimen on the lower pressure plates of the first and second clamping assemblies 7 and 8, respectively, and clamp and secure the specimen using the operating knobs. Rotate the bidirectional threaded rod 5 until the tension value monitored by the tension sensor embedded in the sliding bases reaches zero.

[0061] Activate cylinder 9, driving pressure head 10 downward to press the bonding sample down to the required bending radius. The device with the bonding sample is then placed in an oven at a specific temperature. After a preset time, the device is removed from the oven and the bonding sample is removed from the device. After standing at room temperature for 24 hours, the sample undergoes a bonding strength test.

[0062] By adjusting the position of the sliding base, the present invention can, on the one hand, apply shear forces of different sizes parallel to the bonding surface to the bonding sample to stretch the sample; it can also fix the sample and cooperate with the cylinder and the pressure head to achieve three-point bending of the bonding sample; the above operations are coordinated to achieve the application of tensile or bending stress to the sample alone, or the application of bending-tensile stress at the same time, simulating the stress state of the bonding layer under different cable operating conditions to meet the needs of multiple scenarios.

[0063] Furthermore, all components in the experimental device described in the present invention can withstand a high temperature of 300°C. After the sample is clamped in the device and the required stress is applied, the entire device with the sample can be placed in an oven to achieve tensile-bending-thermal stress combined aging of the bonded sample, which is beneficial to assess and verify the performance of the hot-melt adhesive layer during the long-term operation of the high-voltage smooth aluminum-sheathed XLPE cable.

[0064] Compared with the prior art, the beneficial effects of the present invention include at least:

[0065] 1. It can ensure that the horizontal force and tensile stress of the sample are adjustable: the bonding sample is clamped and fixed by a clamping assembly with an adjustable lower pressure plate height to ensure that only horizontal shear stress is applied to the bonding sample. At the same time, by rotating the two-way threaded rod to adjust the position of the clamping assembly, the shear stress on the bonding sample can be controlled to meet different test requirements.

[0066] 2. Different bending stresses can be applied to the specimen: After the bonded specimen is effectively fixed by the clamping assembly, the pressure head can be moved vertically downward by the cylinder to a set distance, thereby applying different bending stresses to the specimen, so that the specimen can be bent at three points according to the set bending radius to meet different test requirements.

[0067] 3. Tensile and bending stresses can be applied to the sample at the same time: After the bonded sample is effectively fixed by the clamping assembly, the set shear stress is applied to the sample through the bidirectional threaded rod; on this basis, the cylinder is used to press the pressure head vertically downward to apply bending stress to the sample; through the above operation, tensile and bending stresses can be applied to the sample at the same time.

[0068] 4. Simultaneous application of tensile, bending, and thermal stresses to the specimen: After effectively securing the bonded specimen with the clamping assembly, a bidirectional threaded rod applies a set shear stress to the specimen. Furthermore, a cylinder forces the pressure head downward vertically to apply bending stress to the specimen. The specimen-clamping device is placed in an oven at different temperatures to subject the specimen to thermal stress. Through these operations, tensile, bending, and thermal stresses can be applied simultaneously to the specimen.

[0069] 5. This device solves the clamping problem for bonding samples and can apply tensile, bending and thermal stress to the samples individually or simultaneously. It effectively solves the problem that the existing technology cannot simultaneously achieve stretching, bending and heating of bonding samples to evaluate the stress and aging performance of the smooth aluminum-sheathed cable adhesive layer. It provides strong support for comprehensively evaluating the performance of hot melt adhesives under test conditions that are more in line with the actual operating conditions of the cable.

[0070] 6. In addition to bonding specimens, the device can also be used for other single or composite metal and non-metal specimens.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A combined tensile bending and thermal stress test method, characterized in that: The method is implemented based on a tensile bending and thermal stress combined test device, the device comprising a support frame (1), the support frame (1) being provided with a mechanical tensile device and a three-point bending device; the mechanical tensile device being used for detecting tensile force, comprising a first sliding base (3), a second sliding base (4), a bidirectional threaded rod (5), a first clamping assembly (7) and a second clamping assembly (8), the middle portions of the first sliding base (3) and the second sliding base (4) being connected to the bidirectional threaded rod (5) via a threaded structure, the top ends of the first sliding base (3) and the second sliding base (4) being fixedly connected with the first clamping assembly (7) and the second clamping assembly (8), respectively, the sample being fixed between the first clamping assembly (7) and the second clamping assembly (8), and the tensile force of the sample being detected by rotating the bidirectional threaded rod (5); the three-point bending device being provided at the top of the support frame (1), and the bending force of the sample being detected by pressing down the three-point bending device; After the bonded sample is fixed by the first clamping assembly (7) and the second clamping assembly (8), a set shear stress is applied to the sample through the bidirectional threaded rod (5); on this basis, a bending stress is applied to the sample by vertically pressing downward through a three-point bending device; the device for clamping the sample is placed in an oven at different temperatures so that the sample is subjected to thermal stress. Through the above operations, tensile, bending and thermal stress are applied to the sample at the same time; The method specifically comprises the following steps: According to the length of the bonding sample, the bidirectional threaded rod (5) is rotated to adjust the first sliding base (3) and the second sliding base (4) to appropriate positions, and the bonding sample is fixed between the first clamping assembly (7) and the second clamping assembly (8); Rotate the bidirectional threaded rod (5) to apply a set shear stress to the sample according to the tensile force value monitored by the tensile force sensor embedded in the sliding base, and detect the tensile force of the sample; Start the three-point bending device, apply bending stress to the sample to make it reach the required bending radius, and test the bending force of the sample; Place the device with the bonded sample in an oven at a preset temperature. After a preset time, remove the device from the oven and remove the bonded sample from the device. After standing at room temperature, the samples were subjected to a bonding strength test to obtain the tensile bending and thermal stress test results of the samples.

2. A combined tensile bending and thermal stress test method according to claim 1, characterized in that: The mechanical stretching device further comprises a slideway (2), which passes through both ends of the first sliding base (3) and the second sliding base (4) respectively, and is fixed to the support base of the support frame (1).

3. The combined tensile bending and thermal stress test method according to claim 1, characterized in that: The three-point bending device comprises a cylinder (9) and a pressure head (10). The cylinder (9) is fixed to the middle of the top end of the support frame (1). The driving end of the cylinder (9) is fixedly connected to the pressure head (10). When the cylinder (9) is started, the pressure head (10) is driven downward to press the sample downward.

4. A combined tensile bending and thermal stress test method according to claim 1, characterized in that: The mechanical stretching device further comprises a nut (6), one end of the bidirectional threaded rod (5) is fixedly connected to the nut (6), and the nut (6) is rotatably connected to one end of the support seat.

5. A combined tensile bending and thermal stress test method according to claim 4, characterized in that: The bidirectional threaded rod (5) is driven to rotate by rotating the nut (6), and the threads on both sides of the bidirectional threaded rod (5) rotate in opposite directions, synchronously driving the first sliding base (3) and the second sliding base (4) to move closer to or away from each other.

6. The combined tensile bending and thermal stress test method according to claim 1, characterized in that: The first sliding base (3) and the second sliding base (4) are embedded with tension sensors, and the tension value of the sample is monitored by the tension sensors.

7. The combined tensile bending and thermal stress test method according to claim 1, characterized in that: The first clamping assembly (7) comprises a first lower pressing plate (71), a sliding frame (72), a first knob (73) and a first upper pressing plate (74); One side of the first lower pressing plate (71) is fixedly connected to the sliding frame (72), the top of the sliding frame (72) is connected to the first knob (73) via a threaded structure, and the bottom of the first knob (73) is rotatably connected to the first upper pressing plate (74).

8. The combined tensile bending and thermal stress test method according to claim 1, characterized in that: The second clamping assembly (8) comprises a second lower pressing plate (81), a limiting frame (83), a second knob (82) and a second upper pressing plate (84); One side of the second lower pressing plate (81) is connected to the limiting frame (83), the top of the limiting frame (83) is connected to the second knob (82) via a threaded structure, and the bottom of the second knob (82) is rotatably connected to the second upper pressing plate (84).

9. The combined tensile bending and thermal stress test method according to claim 6, characterized in that: The second clamping assembly (8) further includes a bolt (85). The height of the second lower pressing plate (81) can be adjusted according to the size of the bonding sample and is fixed to the limiting frame (83) via the bolt (85).

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