A non-contact thermal shock high temperature mechanical testing device

Abstract

The invention discloses a non-contact thermal shock high-temperature mechanical testing device, which belongs to the field of high-temperature mechanical performance testing. The device comprises a base, a mechanical experiment module, a middle crossbeam, an outer-cavity upper clamp and a spherical cavity. The spherical cavity is fixed on a guide rail by a cavity bracket, and is provided with an upper pull rod, an upper vacuum bellows, a vacuum gauge, an infrared lamp heating module, a laser heating module, a sample injection door with an observation window, an infrared temperature measurement module, a dynamic testing module, a vacuum exhaust module, an air intake module, a lower pull rod and a lower vacuum bellows. An extensometer, an inner-cavity upper clamp, an inner-cavity lower clamp and a test piece are provided inside the spherical cavity. The device can provide a freely switchable thermal load environment, a vacuum or inert gas environment and a laser thermal shock environment, is easy to assemble and disassemble, and has high flexibility and sealing performance. Dynamic and multi-angle observation can be realized.

Description

Technical Field

[0001] The present invention belongs to the field of experimental equipment for high-temperature materials, and specifically relates to a non-contact thermal shock high-temperature mechanical testing device, which can realize testing environments such as laser shock, high temperature, vacuum, and inert gas. Background Art

[0002] With the development of strategic technologies such as hypersonic space vehicles and high thrust-to-weight ratio engines, the study of mechanical problems of material structures in high-temperature extreme environments (especially high-temperature oxidizing environments above 2000℃) has raised a series of challenging problems that need to be urgently solved. The high-temperature three-dimensional stress state, micro-nanostructure evolution, and dynamic behavior of atomic-electronic systems of materials under high-temperature extreme conditions have a crucial impact on the service performance of the structure and the damage resistance of the functional system. However, it is very difficult and costly to directly carry out mechanical and structural performance tests of standard specimens in such high-temperature extreme environments, especially in the temperature range above 2000℃; the corresponding theoretical analysis methods and means lack experimental support, so it is necessary to develop a high-temperature experimental device that can simulate the real thermal field environment.

[0003] On July 31, 2018, Chinese patent document CN 108344644 ​​A disclosed “High temperature tensile test device and method thereof”, which mainly includes a static loading system, a sample clamping system, a sample heating system, a graphics acquisition system, etc. Its heating system adopts resistance heating and uses thermocouples to measure temperature, which can capture the damage and deformation of the sample under high temperature tensile load; Chinese patent document CN 208140498 U disclosed “High temperature multi-load loading in-situ test device” on November 23, 2018, which mainly includes a high temperature loading module, a multi-load loading module, an in-situ observation module and a support module, which can realize multi-load loading tests in a vacuum or inert gas environment, and the high temperature heating furnace induction heats the graphite heating element through an induction coil; Chinese patent document CN 108760525 On November 6, 2018, A disclosed "an in-situ ultra-high temperature tensile test device based on a computer tomography system", which mainly includes a test system for in-situ observation of ultra-high temperature tensile specimens, a load loading system, a loading control system, a heating system, a temperature measurement system, a protective gas device for simulating the gas environment under the service conditions of the specimen, etc. The heating system adopts resistance heating and uses infrared temperature measurement.

[0004] Comprehensive analysis of the above devices shows that the above existing detection devices have the following shortcomings: 1) The above devices are heated by resistance furnaces, graphite furnaces, etc., with a large heating area and high power consumption, and the experimental fixture is set in the high temperature zone, which makes material selection and design difficult; those heated by high-temperature induction furnaces can only heat highly conductive samples, and the interchangeability and adaptability of induction components are poor, and are not suitable for use on some complex-shaped specimens and composite materials; 2) It is difficult to conduct thermal shock, thermal fatigue, laser damage and other test experiments simultaneously with mechanical tests; 3) For fracture and other experiments, only pre-processed incisions and pre-cracks can be made, and local controllable damage cannot be introduced during the test; 4) The heating cavity is large and sealed, which makes the observation window small, making it difficult to achieve multi-angle real-time observation. Summary of the invention

[0005] In response to the above problems, the present invention provides a non-contact thermal shock high-temperature mechanical testing device, which can provide a conventional thermal load environment, a vacuum or inert gas environment, and a laser thermal shock environment, and these complex environments can be applied and switched freely at the same time, and has the characteristics of high flexibility.

[0006] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0007] A non-contact thermal shock high-temperature mechanical testing device comprises a base 11 and a mechanical experiment module 1 fixed on the base 11; the mechanical experiment module 1 and the base 11 form a cavity, a middle crossbeam 2 is arranged transversely in the cavity, and both ends of the middle crossbeam 2 are fixedly connected to the mechanical experiment module; two symmetrical guide rails 7 are arranged longitudinally in the cavity, one end of the two guide rails 7 is fixedly connected to the mechanical experiment module, and the other end of the two guide rails 7 is fixedly connected to the base 11; an outer-cavity upper clamp 3 is fixedly arranged below the middle crossbeam 2, and an outer-cavity lower clamp 10 is correspondingly arranged on the upper surface of the base 11;

[0008] The spherical cavity 15 is slidably connected to the two guide rails 7 through the cavity bracket 16. Both ends of the cavity bracket 16 are slidably connected to the guide rails 7, slide up and down along the guide rails 7 and can be locked at any position of the guide rails 7; the spherical cavity 15 is a hollow spherical cavity, and the upper vacuum bellows 13 and the lower vacuum bellows 18 are symmetrically arranged on the spherical cavity 15, and are both sealed and connected to the spherical cavity 15 through flanges; an upper pull rod 12 is provided through the upper vacuum bellows 13, one end of the upper pull rod 12 matches the upper clamp 3 outside the cavity, and the other end matches the upper clamp inside the cavity 19 is connected by threads; a lower pull rod 9 is provided in the lower vacuum bellows 18; one end of the lower pull rod 9 matches the lower fixture 10 outside the cavity, and the other end is connected by threads to the lower fixture 22 inside the cavity; the spherical cavity 15 is respectively connected to the vacuum gauge 4, the infrared heating module 5, the laser heating module 6, the infrared temperature measurement module 23, the dynamic test module 24, the vacuum exhaust module 8, the air intake module 17, and the injection door 14 through a flange that penetrates the surface of the spherical cavity 15; the injection door 14 is provided with an observation window, and the air intake module 17 is provided with a flow meter;

[0009] The spherical cavity 15 is provided with a matching upper cavity fixture 19 and a lower cavity fixture 22 , and the test piece 21 is located between the upper cavity fixture 19 and the lower cavity fixture. An extensometer 20 is also fixedly provided on the inner wall of the spherical cavity 15 .

[0010] Furthermore, the spherical cavity 15 is provided with a total of sixteen flanges that penetrate the surface of the spherical cavity 15, among which four middle flanges are symmetrically arranged on the spherical cavity 15, and they (i.e., the four middle flanges) divide the spherical cavity 15 into symmetrical upper and lower parts. A top flange is provided at the top of the upper part of the spherical cavity 15, and the top flange is sealed and connected to the upper vacuum bellows 13; a bottom flange is provided at the bottom end of the lower part of the spherical cavity 15, and the bottom flange is sealed and connected to the lower vacuum bellows 18; four upper flanges are symmetrically arranged at the upper part of the spherical cavity 15; four lower flanges are symmetrically arranged at the lower part of the spherical cavity 15; and two side flanges are symmetrically arranged at the lower part of the spherical cavity 15 and are located on both sides of the lower vacuum bellows 18.

[0011] Furthermore, the four middle flanges are respectively connected to the laser heating module 6 (for introducing the outgoing laser), the infrared temperature measurement module 23 (measuring temperature through infrared and colorimeter), the sample injection door 14 (for rapid sample injection and observation of the specimen 21), and the dynamic test module 24.

[0012] Furthermore, the two side flanges are connected to the air intake module 17 and the vacuum pumping module 8 respectively.

[0013] Furthermore, the model of the middle flange is CF100, the models of the top flange and the bottom flange are both CF32, the models of the upper flange and the lower flange are both CF63, and the model of the side flange is CF15.

[0014] Furthermore, the heating system is composed of an infrared heating module 5 and a laser heating module 6. Among them, the infrared heating module 5 includes at least one infrared lamp, and can also be composed of one, two, four or more sets of focused infrared lamp groups. The focus of the infrared lamp is concentrated on the heating part of the specimen 21. The focused infrared lamp is a common commercially available product, such as a 150W to 450W infrared lamp of the HT60 type with a water-cooled radiator. The infrared lamp is powered by a commercial constant current power supply, and the power supply is controlled in real time through the Labview program (or other conventional methods or programs in the field) to achieve power adjustment of the focused infrared lamp. The focused infrared lamp is confocal on the sample heating part, and the sample placed at the center of the cavity can be infrared heated. The infrared lamp radiator is connected to a conventional water cooler with a flow rate of more than 10L / min through a 6mm water pipe to ensure that the temperature of each connecting component is always within a safe range during the heating process. The heating temperature of the infrared module can reach up to 1650°C.

[0015] The laser heating module 6 is composed of a carbon dioxide laser 27, a reflector 26 and an adjustable ZnSe focusing mirror 25, wherein the carbon dioxide laser 27 is a commercial product, such as NT1000SM or NT2000SM of Nanjing Optics Valley Nuotai Company. The reflector 26 and the ZnSe focusing mirror 25 form an L-shaped optical path, and the outer wall of the optical path is protected by a stainless steel sleeve to prevent laser leakage; the ZnSe focusing mirror 25 is provided with a fine-tuning structure that can adjust the position in three directions of XYZ. The laser beam focused by the ZnSe focusing mirror is introduced into the sample part through the middle flange of the spherical cavity 15.

[0016] Furthermore, the environmental control system includes a vacuum pumping module 8 and an air intake module 17. The vacuum pumping module 8 is a composite vacuum pumping system commonly used in the art, such as an Edwards T-Station 85 turbomolecular pump group including a mechanical pump, a molecular pump, and a composite vacuum gauge; the air intake module 17 includes a solenoid valve and a proton flowmeter. The proton flowmeter is a conventional flowmeter, such as the Sevenstar Huachuang D07 flowmeter, which can perform precise control of the intake flow at the sccm level according to experimental needs.

[0017] The heating method of the test piece of the present invention adopts infrared lamp heating and laser heating. Both of these heating methods belong to non-contact local heating, which can be used separately or simultaneously to achieve a higher heating temperature.

[0018] In addition, there are four symmetrically distributed CF63 flanges at the bottom of the spherical cavity 15, which can also be used to install more infrared lamps or for other extended purposes.

[0019] When the laser heating module 6 is working, by controlling the power, frequency and focal size of the laser, the heating temperature range can cover the range from room temperature to above 2000℃, and the test piece can be subjected to thermal pulse shock test. The environmental control system equipped in the experimental device can achieve 10 -4 pa vacuum environment.

[0020] In the above modules, the mechanical experiment module 1, the middle crossbeam 2, the guide rail 7, the base 11, the cavity support 16, etc. are made of conventional steel (45 or 40Cr) or stainless steel (302 or 304); the vacuum cavity, vacuum bellows and flange are made of 304 stainless steel, the flange seal uses oxygen-free copper gaskets, and the flange window is made of quartz glass or ZnSe glass. The intracavity fixture uses tungsten steel (YG15 or YG20C) or high-temperature alloy (GH4145 or GH4049).

[0021] The spherical cavity 15 in the present invention is connected to the testing machine through the cavity bracket 16. Since the cavity itself is not subject to a large external load, the connection meets the strength requirements and can be easily assembled and disassembled. The spherical design can minimize the mutual interference of the modules in the spatial position, and also make the cavity itself have higher mechanical strength. Each working module is tightly connected to the cavity through a flange, which maximizes the vacuum degree during the test. The material of the sample installation door and window in the present invention is high temperature resistant glass, and the glass window ensures that non-contact digital graphics correlation methods can be used to perform dynamic in-situ observation of samples within a large angle range.

[0022] Compared with the existing experimental devices, the non-contact thermal shock high temperature mechanical testing device provided by this application has the following advantages:

[0023] 1. The experimental device of this application adopts focused infrared and laser non-contact heating, so that the heat part can be concentrated on the sample specimen area, reducing the overall power consumption and cooling difficulty, so that conventional fixtures can be used for high-temperature mechanical testing, and increasing testing flexibility.

[0024] 2. By changing the focus, pulse frequency, power and other parameters of infrared and laser, rapid thermal shock, thermal fatigue and laser damage experiments can be performed simultaneously with dynamic mechanical tests such as tension, compression and fatigue, solving the problem that existing devices cannot perform these tests simultaneously.

[0025] 3. For the test specimens, in addition to pre-processing cuts and pre-cracks for fracture damage experiments, the sample can also be cut by focusing the laser during the tensile test to introduce local damage and perform dynamic damage tests.

[0026] 4. Non-contact heating concentrates the heat in a cubic centimeter-level space. A large number of observation windows can be set in the entire vacuum environment cavity to achieve multi-functional, multi-angle, and real-time observation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 It is a vertical partial cross-section of the spherical experimental cavity;

[0029] Figure 3 It is the transverse section of the spherical test cavity and the laser light path diagram;

[0030] Figure 4 Labview program to control infrared light

[0031] In the figure: 1-mechanical experiment module, 2-middle crossbeam, 3-upper fixture outside the cavity, 4-vacuum gauge, 5-infrared lamp heating module, 6-laser heating module, 7-guide rail, 8-exhaust module, 9-lower pull rod, 10-lower fixture outside the cavity, 11-base, 12-upper pull rod, 13-upper vacuum bellows, 14-fast sampling door with observation window, 15-spherical cavity, 16-cavity bracket, 17-intake module with flow meter, 18-lower vacuum bellows, 19-upper fixture inside the cavity, 20-extensometer, 21-test piece, 22-lower fixture inside the cavity, 23-infrared temperature measurement module, 24-dynamic test module, 25-laser focusing lens group, 26-laser reflector, 27-laser generator. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1 Focused infrared lamp experiment

[0034] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a non-contact thermal shock high temperature mechanical testing device of the present invention. Figure 1It can be seen that the non-contact thermal shock high-temperature mechanical testing device includes a base 11 and a mechanical experiment module 1 fixed on the base 11, a cavity is formed between the mechanical experiment module 1 and the base 11, a middle crossbeam 2 is arranged horizontally in the cavity, and both ends of the middle crossbeam 2 are fixedly connected to the mechanical experiment module; two symmetrical guide rails 7 are arranged longitudinally in the cavity, one end of the guide rail 7 is fixedly connected to the mechanical experiment module, and the other end is fixedly connected to the base 11; an outer cavity upper clamp 3 is fixedly arranged below the middle crossbeam 2, and an outer cavity lower clamp 10 is correspondingly arranged on the upper surface of the base 11; the spherical cavity 15 is slidably connected to the two guide rails 7 through a cavity bracket 16, and both ends of the cavity bracket 16 are slidably connected to the guide rail 7, slide up and down along the guide rail 7 and can be locked at any position of the guide rail 7;

[0035] like Figure 2 As shown, the spherical cavity 15 is a hollow spherical cavity, and the upper vacuum bellows 13 and the lower vacuum bellows 18 are symmetrically arranged on the spherical cavity 15, and are both sealed and connected to the spherical cavity 1) through flanges; an upper tie rod 12 is provided through the upper vacuum bellows 13, one end of the upper tie rod 12 matches the upper fixture 3 outside the cavity, and the other end is connected to the upper fixture 19 inside the cavity by threading; a lower tie rod 9 is provided through the lower vacuum bellows 18, one end of the lower tie rod 9 matches the lower fixture 10 outside the cavity, and the other end is connected to the lower fixture 22 inside the cavity by threading; The spherical cavity 15 is connected to the vacuum gauge 4, the infrared heating module 5, the laser heating module 6, the infrared temperature measurement module 23, the dynamic test module 24, the vacuum exhaust module 8, the air intake module 17, and the injection door 14 respectively through flanges penetrating the surface of the spherical cavity 15; the injection door 14 is provided with an observation window, and the air intake module 17 is provided with a flow meter; the interior of the spherical cavity 15 is provided with a matching upper cavity clamp 19 and a lower cavity clamp 22, and the specimen 21 is located between the upper cavity clamp 19 and the lower cavity clamp, and an extensometer 20 is also fixedly provided on the inner wall of the spherical cavity 15.

[0036] In this embodiment, the spherical cavity 15 is provided with a total of sixteen flanges penetrating the surface of the spherical cavity 15, among which four middle flanges are symmetrically arranged on the spherical cavity 15, and they (i.e., the four middle flanges) divide the spherical cavity 15 into symmetrical upper and lower parts. The top of the upper part of the spherical cavity 15 is provided with a top flange, and the top flange is sealed and connected to the upper vacuum bellows 13; the bottom of the lower part of the spherical cavity 15 is provided with a bottom flange, and the bottom flange is sealed and connected to the lower vacuum bellows 18; the upper part of the spherical cavity 15 is symmetrically provided with four upper flanges; the lower part of the spherical cavity 15 is symmetrically provided with four lower flanges; the two side flanges are symmetrically arranged at the lower part of the spherical cavity 15 and located on both sides of the lower vacuum bellows (18); the two side flanges are respectively connected to the air intake module 17 and the vacuum pumping module 8; the model of the middle flange is CF100, the model of the top flange and the bottom flange are both CF32, the model of the upper flange and the lower flange are both CF63, and the model of the side flange is CF15. The four middle flanges are respectively connected to the laser heating module 6 (for the introduction of the emitted laser), the infrared temperature measurement module 23 (temperature measurement by infrared and colorimeter), the sample injection door 14 (for rapid injection and observation of the specimen 21), and the dynamic test module 24. In a specific implementation, a plurality of flanges can also be provided on the surface of the spherical cavity 15 according to actual test needs.

[0037] In this embodiment, the heating module 5 includes 4 sets of focused infrared lamps (HT60 type from Heat-tech, power 150W-450W), the power of the infrared lamps is adjusted through the Labview program, and the infrared lamp radiator is connected to a conventional water cooler with a flow rate of more than 10L / min through a 6mm water pipe to ensure that the temperature of each connecting component is always within a safe range during the heating process. The infrared module heating temperature can reach up to 1650°C.

[0038] The laser heating module 6 is composed of a carbon dioxide laser 27, a reflector 26 and an adjustable ZnSe focusing mirror 25, wherein the carbon dioxide laser 27 is purchased from Nanjing Optics Valley Notai Company NT1000SM model, the reflector 26 and the ZnSe focusing mirror 25 (purchased from Thorlabs) form an L-shaped optical path, and the outer wall of the optical path is protected by a stainless steel sleeve to prevent laser leakage; the ZnSe focusing mirror 25 is provided with a fine-tuning structure that can adjust the position in three directions of XYZ, and the laser beam focused by the ZnSe focusing mirror is introduced into the sample part through the middle flange of the spherical cavity 15.

[0039] In this embodiment, the vacuum pumping module 8 adopts an Edwards T-Station 85 turbomolecular pump group including a mechanical pump, a molecular pump, and a compound vacuum gauge; the air intake module 17 adopts a proton flowmeter (Seven Star Huachuang D07, including a solenoid valve and a controller), which can accurately control the air intake flow rate at the sccm level according to experimental needs.

[0040] There are four symmetrically distributed CF63 flanges at the bottom of the spherical cavity (15).

[0041] In this embodiment, the mechanical experiment module 1, the middle cross beam 2, the guide rail 7, the base 11, the cavity support 16, etc. are all made of 304 stainless steel; the vacuum cavity, the vacuum bellows and the flange are made of 304 stainless steel, the flange seal adopts an oxygen-free copper gasket, the flange window is made of quartz glass, and the intra-cavity fixture is tungsten steel (purchased from Zhuzhou Sanxin).

[0042] like Figure 3 As shown, the test piece 21 of this embodiment is a rod-shaped test piece.

[0043] The use of this device is as follows:

[0044] 1) Open the fast sampling door 14 with an observation window, select the appropriate upper clamp 17 in the cavity and the lower clamp 19 in the cavity according to the shape and size of the specimen 21, and assemble them on the upper pull rod 12 and the lower pull rod 9 respectively; install the specimen 21 according to the experimental requirements, clamp the upper clamp 17 in the cavity and the lower clamp 19 in the cavity at both ends of the experimental section of the specimen 21 respectively, then adjust the bracket of the extensometer to make the extensometer 20 against the specimen 21, and connect the extensometer 20 to the computer host, and close the fast sampling door 14 with an observation window.

[0045] 2) Turn on the vacuum pumping module 8 to evacuate the spherical cavity 15, and start the mechanical pump and the molecular pump in sequence until the vacuum degree in the cavity stabilizes to 10 -4 About pa.

[0046] 3) Start the infrared lamp heating module 5 and adjust the focal length of the four infrared lamps in a low power state so that they are focused on the central test area of ​​the test piece 21 .

[0047] 4) Start the mechanical experiment module 1, operate the loading system, and apply prestress to the specimen 21.

[0048] Through the Labview program (the Labview program used in this embodiment is programmed in the attached Figure 4 ) controls the infrared lamp driving power supply to gradually increase the current to heat the test piece 21, and at the same time the infrared temperature measuring device 23 monitors the temperature of the test piece 21 in real time.

[0049] When the temperature of the specimen 21 stabilizes to 1000° C., the loading system is operated to perform tensile loading on the specimen 21 . After the measurement is completed, the loading is stopped, each module is closed, and the experimental data is analyzed.

[0050] In specific applications, other conventional methods or procedures may also be used to achieve the purpose of controlling the temperature of the infrared lamp.

[0051] Example 2 Laser Experiment

[0052] The difference between this embodiment and embodiment 1 lies in the experimental environment and heating method. After the spherical cavity 15 is evacuated, the air inlet module 17 with a flow meter is turned on to fill the spherical cavity 15 with argon gas until the air pressure reaches 10 -2 pa.

[0053] Do not use the infrared lamp heating module, only the laser heating module is used. Turn on the laser heating module 6, adjust the laser light path in the visible light mode, and adjust the focal length of the laser in the low power state to focus on the test area of ​​the specimen 21. The laser driving power supply is remotely controlled by a computer. In the continuous output mode, the laser output power is gradually increased to 600W. At the same time, the infrared temperature measuring device 23 and the colorimeter monitor the temperature of the test piece. After reaching 1600°C, the laser maintains the temperature in a pulsed manner and performs mechanical testing.

[0054] The other parts and experimental process of this embodiment are the same as those of embodiment 1.

[0055] Example 3 Infrared-laser synchronous heating experiment

[0056] The experimental device of this embodiment is the same as that of the embodiment 1, except that the infrared module 5 and the laser module 6 are used simultaneously to heat the test piece 21 in the experimental steps.

[0057] Start the infrared lamp heating module 5, adjust the focal length of the four infrared lamps in the low power state, so that they are focused on the specimen 21. Then start the laser heating module 6, adjust the laser light path in the visible light mode, and adjust the focal length of the laser in the low power state so that it is focused on the specimen 21. Then control the infrared module to heat the sample surface to a constant temperature of 800°C. Then turn on the laser module, gradually increase the output power, and use infrared temperature measurement and colorimeter feedback to make the sample area temperature reach an ultra-high temperature state of more than 2000°C.

[0058] The other parts and experimental process of this embodiment are the same as those of embodiment 1.

[0059] Example 4 Infrared and laser thermal damage experiment

[0060] The experimental device of this embodiment is the same as that of embodiment 1, except that in the experimental steps, the test piece 21 is subjected to laser hole opening processing during the loading process.

[0061] The infrared module was turned on to heat the plate sample to 500°C for fatigue testing. After 4 hours of testing, without unloading, the laser module was turned on to control the laser generator 27 to generate 800W continuous laser, and a through hole with a diameter of 2mm was instantly formed in the middle of the plate sample, and then the laser module was turned off. The fatigue test was continued at 500°C, and the force-displacement data of the whole process were recorded at the same time.

[0062] The other parts and experimental process of this embodiment are the same as those of embodiment 1.

[0063] Example 5 Infrared and laser thermal shock experiments

[0064] The difference between this embodiment and embodiment 1 is that the test piece 21 is impacted by laser pulses during the loading process.

[0065] The infrared module was turned on to heat the rod-shaped sample to 750°C for fatigue testing. After 4 hours of testing, without unloading, the laser module was turned on to control the laser generator 27 to generate 400W, 2Hz pulsed laser, and the pulsed laser was continuously applied for 30 seconds. Then the laser module was turned off, and the fatigue test was continued at 750°C, and the force-displacement data of the whole process were recorded at the same time.

[0066] The other parts and experimental process of this embodiment are the same as those of embodiment 1.

[0067] 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, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A non-contact thermal shock high temperature mechanical testing device, comprising a base (11) and a mechanical experiment module (1) fixed on the base (11), characterized in that: The mechanical experiment module (1) and the base (11) form a cavity, a middle crossbeam (2) is arranged transversely in the cavity, and both ends of the middle crossbeam (2) are fixedly connected to the mechanical experiment module; two symmetrical guide rails (7) are arranged longitudinally in the cavity, one end of the guide rail (7) is fixedly connected to the mechanical experiment module, and the other end is fixedly connected to the base (11); An outer cavity upper clamp (3) is fixedly provided below the middle cross beam (2), and an outer cavity lower clamp (10) is correspondingly provided on the upper surface of the base (11); The spherical cavity (15) is slidably connected to the two guide rails (7) via a cavity bracket (16); both ends of the cavity bracket (16) are slidably connected to the guide rails (7) and slide up and down along the guide rails (7); The spherical cavity (15) is a hollow spherical cavity, and is provided with a total of sixteen flanges penetrating the outer wall of the spherical cavity (15); among them, four middle flanges are symmetrically arranged on the spherical cavity (15), and they divide the spherical cavity (15) into symmetrical upper and lower parts. A top flange is provided at the top of the upper part of the spherical cavity (15), and the top flange is sealed and connected to the upper vacuum bellows (13); a bottom flange is provided at the bottom end of the lower part of the spherical cavity (15), and the bottom flange is sealed and connected to the lower vacuum bellows (18); the upper part of the spherical cavity (15) is symmetrically provided with four upper flanges; the lower part of the spherical cavity (15) is symmetrically provided with four lower flanges; two side flanges are symmetrically arranged at the lower part of the spherical cavity (15) and are located on both sides of the lower vacuum bellows (18); An upper vacuum bellows (13) and a lower vacuum bellows (18) are symmetrically arranged on the spherical cavity (15), and are both sealed and connected to the spherical cavity (15) through flanges; an upper pull rod (12) is provided through the upper vacuum bellows (13), one end of which matches the upper fixture (3) outside the cavity, and the other end is connected to the upper fixture (19) inside the cavity; a lower pull rod (9) is provided through the lower vacuum bellows (18), one end of which matches the lower fixture (10) outside the cavity, and the other end is connected to the lower fixture (22) inside the cavity; the spherical cavity (15) is respectively connected to the vacuum gauge (4), the infrared heating module (5), the laser heating module (6), the infrared temperature measurement module (23), the dynamic test module (24), the vacuum exhaust module (8), the air intake module (17), and the injection door (14) through flanges that penetrate the surface of the spherical cavity (15); The spherical cavity (15) is provided with a matching upper cavity fixture (19) and a lower cavity fixture (22), the test piece (21) is located between the upper cavity fixture (19) and the lower cavity fixture, and an extensometer (20) is also fixedly provided on the inner wall of the spherical cavity (15).

2. The non-contact thermal shock high temperature mechanical testing device according to claim 1, characterized in that: The infrared heating module (5) comprises at least one infrared lamp.

3. The non-contact thermal shock high temperature mechanical testing device according to claim 1, characterized in that: The laser heating module (6) is composed of a carbon dioxide laser (27), a reflector (26) and an adjustable ZnSe focusing mirror (25), and the reflector (26) and the ZnSe focusing mirror (25) form an L-shaped optical path.

4. The non-contact thermal shock high temperature mechanical testing device according to claim 1, characterized in that: The air intake module (17) comprises a solenoid valve and a proton flow meter which are connected in sequence.

5. The non-contact thermal shock high temperature mechanical testing device according to claim 1, characterized in that: The sample injection door (14) is provided with an observation window.

6. The non-contact thermal shock high temperature mechanical testing device according to claim 1, characterized in that: The middle flange is respectively connected to the laser heating module (6), the infrared temperature measurement module (23), the sample injection door (14) and the dynamic test module (24).

7. The non-contact thermal shock high temperature mechanical testing device according to claim 1, characterized in that: The side flanges are respectively connected to the air intake module (17) and the vacuum exhaust module (8); the model of the middle flange is CF100, the model of the top flange and the bottom flange are both CF32, the model of the upper flange and the lower flange are both CF63, and the model of the side flange is CF15.

8. The non-contact thermal shock high temperature mechanical testing device according to any one of claims 1 to 7, characterized in that: The mechanical experiment module (1), the middle crossbeam (2), the guide rail (7), the base (11), and the cavity support (16) are made of steel or stainless steel; the spherical cavity (15), the vacuum bellows (13), and the flange are made of stainless steel.

9. The non-contact thermal shock high temperature mechanical testing device according to any one of claims 1 to 7, characterized in that: The material of the upper intracavity clamp (19) and the lower intracavity clamp (22) is tungsten steel or high-temperature alloy.

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