Fatigue Test Device and Test System

Abstract

This application relates to the technical field of material property testing and analysis, and particularly to a fatigue testing device and a testing system. Among them, the fatigue testing device includes a testing environment chamber capable of providing a vacuum and a sealed environment, a radiation heating furnace disposed in the testing environment chamber, and a specimen fixture capable of withstanding high temperatures. The radiation heating furnace includes a heat insulation structure and a radiation heating module disposed within the heat insulation structure, wherein: The specimen fixture is disposed beside the radiation heating module, and the specimen fixture is used to clamp the material specimen to be tested. In this way, the heat insulation structure can concentrate the heat of the radiation heating module within the heat insulation structure in a sealed vacuum environment. It can be understood that a heat insulation barrier is set in the vacuum environment, so that while the heat of the radiation heating module is more concentrated, the influence of the heat on the testing environment chamber can be reduced. In this way, the durability and service life of the testing environment chamber are provided, and the testing efficiency of the fatigue testing device is improved.

Description

Technical Field

[0001] This application relates to the technical field of material performance test and analysis, and particularly to a fatigue test device and a test system. Background Art

[0002] Due to the continuous development of aerospace technology, the requirements for aerospace materials are getting higher and higher. Therefore, test equipment that can simulate the heat and stress conditions of materials in the aerospace environment has become crucial.

[0003] In the existing scenario, the inventor found that when testing the specimen material, the specimen material is usually placed in a test environment chamber, and the environmental temperature of the test environment chamber is heated to test the specimen material in the test environment chamber. The inventor found that due to the large environmental space of the test chamber, the heated temperature does not represent the temperature of the specimen material, resulting in inaccurate actual test performance. Therefore, the existing technology has problems that need to be solved urgently. Summary of the Invention

[0004] In view of this, the fatigue test device and test system provided by this application aim to solve at least one of the following problems:

[0005] There are problems with the test accuracy of the existing fatigue test devices for material performance testing.

[0006] In the first aspect of this application, a fatigue test device is provided. The fatigue test device includes a test environment chamber that can provide a vacuum and a sealed environment, a radiation heating furnace disposed in the test environment chamber, and a specimen fixture that can withstand high temperatures. The radiation heating furnace includes a heat insulation structure and a radiation heating module disposed in the heat insulation structure, where:

[0007] The specimen fixture is disposed beside the radiation heating module, and the specimen fixture is used to clamp the material specimen to be tested.

[0008] Optionally, the heat insulation structure includes a main heat insulation structure, an upper heat insulation structure, and a lower heat insulation structure. The main heat insulation structure is circular, and the upper heat insulation structure and the lower heat insulation structure are respectively installed at both ends of the main heat insulation structure, where:

[0009] The main heat insulation structure, the upper heat insulation structure, and the lower heat insulation structure are all made of stainless steel material and all include multiple layers.

[0010] Optionally, the radiation heating module includes a first heating module and a second heating module arranged in an opposed manner, with a preset distance between the first heating module and the second heating module. The specimen fixture is disposed between the first heating module and the second heating module, and a first distance between the specimen fixture and the first heating module is equal to a second distance between the specimen fixture and the second heating module.

[0011] Optionally, the material specimen is configured in a rod shape, and the specimen fixture includes an upper chuck and a lower chuck, and the upper chuck and the lower chuck respectively grip two ends of the material specimen.

[0012] Optionally, the test environment chamber includes a box body, and a front door and a rear door respectively and hermetically provided on two sides of the box body. The fatigue testing device further includes an upper pull rod and a lower pull rod respectively and dynamically sealed on the box body. The upper pull rod and the lower pull rod can respectively rotate and / or stretch on the box body;

[0013] One end of the upper pull rod is detachably connected to one end of the upper chuck, and the other end of the upper pull rod can be connected to an upper rod of an external fatigue testing device, and the upper rod of the external fatigue testing device can drive the upper pull rod to rotate and / or stretch;

[0014] One end of the lower pull rod is detachably connected to one end of the lower chuck, and the other end of the lower pull rod can be connected to a lower rod of an external fatigue testing device, and the lower rod of the external fatigue testing device can drive the lower pull rod to rotate and / or stretch.

[0015] Optionally, observation windows are provided on both the front door and the rear door;

[0016] A deformation measurement chamber communicating with the specimen fixture is further opened on the box body. The deformation measurement chamber is used for installing a side-inserted extensometer so that the side-inserted extensometer measures the deformation amount of the material specimen within the gauge length;

[0017] An extensometer water cooling inlet is further provided on the deformation measurement chamber to cool the side-inserted extensometer through the extensometer water cooling inlet, and a measurement window is further provided on the deformation test chamber.

[0018] Optionally, the box body, the front door and the rear door all adopt a double-layer water cooling structure. The double-layer water cooling structure is made of stainless steel material. The fatigue testing device further includes a water cooling system. The water cooling system includes a cold water device and a water distribution device connected to the cold water device. The water distribution device is provided with multiple cooling water channels, and a corresponding copper ball valve is provided on each cooling water channel. The cooling water channels are respectively used for cooling corresponding water cooling structures.

[0019] Optionally, a vacuum pumping and venting pipeline is further provided on the box body, and a vent valve is further provided on the vacuum pumping and venting pipeline;

[0020] The fatigue testing device further includes a vacuum pumping device, and the vacuum pumping device includes a two-stage pump vacuum device, a vacuum pipeline, a vacuum manual regulating valve provided on the vacuum pipeline, and a vacuum measuring instrument. The vacuum pipeline includes a vacuum bellows. One end of the vacuum bellows is hermetically connected to the vacuum pumping and venting pipeline, and the other end of the vacuum bellows is hermetically connected to the two-stage pump vacuum device;

[0021] The fatigue testing device further includes a gas charging and discharging device, an electric contact vacuum pressure gauge installed on the box body, a first high-vacuum fine-tuning valve provided on the electric contact vacuum pressure gauge, and a second high-vacuum fine-tuning valve provided on the vacuum pipeline, where:

[0022] The gas charging and discharging device includes an air charging bottle, and the electric contact vacuum pressure gauge is used to control the charging pressure of the air charging bottle;

[0023] The first high-vacuum fine-tuning valve is connected to an automatic vent solenoid valve on the air charging bottle,

[0024] The second high-vacuum fine-tuning valve is connected to a pressure reducing valve on the air charging bottle.

[0025] Optionally, the fatigue testing device further includes a temperature controller and a plurality of thermocouples. A thermocouple connection channel for thermocouple temperature measurement is further provided on the box body. The thermocouple connection channel can at least communicate with and be close to the position of the material specimen. Through the thermocouple connection channel, the corresponding thermocouple can measure the real-time ambient temperature at a preset position inside the box body, and the temperature controller is used to control the heating temperature of the radiation heating module according to the corresponding real-time ambient temperature.

[0026] In a second aspect of the present application, a testing system is provided, and the testing system includes the fatigue testing device according to any one of the embodiments of the first aspect of the present application.

[0027] Compared with the prior art, the fatigue testing device for material performance testing in the present application has at least the following beneficial effects:

[0028] The fatigue testing device provided in the embodiments of the present application includes a test environment chamber configured with a sealed and vacuum environment, a radiation heating furnace disposed in the test environment chamber, and a specimen fixture capable of withstanding high temperatures. The radiation heating furnace is equipped with a heat insulation structure and a radiation heating module disposed within the heat insulation structure, and the specimen fixture is disposed beside the radiation heating module. In this way, the heat insulation structure can concentrate the heat of the radiation heating module within the heat insulation structure in a sealed vacuum environment, which can be understood as setting up a heat insulation barrier in the vacuum environment. This not only makes the heat of the radiation heating module more concentrated but also reduces the impact of heat on the test environment chamber, thereby improving the durability and service life of the test environment chamber, as well as the test accuracy and test efficiency of the fatigue testing device.

[0029] Other features and advantages of the embodiments of the present application will be described in the following specification. Moreover, some of them will become apparent from the specification or can be understood by implementing the embodiments of the present application. The objectives and other advantages of the embodiments of the present application are achieved and obtained by the structures specifically pointed out in the specification and the drawings. Description of the Drawings

[0030] To more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic diagram of the fatigue testing device provided by an embodiment of the present invention;

[0032] Figure 2 It is another schematic diagram of the fatigue testing device provided by an embodiment of the present invention;

[0033] Figure 3 It is another schematic diagram of the fatigue testing device provided by an embodiment of the present invention.

[0034] Among them, the following is the description of the reference numerals:

[0035] 1 - Test environment chamber; 11 - Front door; 12 - Rear door;

[0036] 2 - Radiation heating furnace; 211 - Main heat insulation structure; 212 - Upper heat insulation structure; 213 - Lower heat insulation structure; 22 - Radiation heating module;

[0037] 3 - Vacuum pumping and venting pipeline;

[0038] 4 - Environment chamber support;

[0039] 51 - Material sample, 52 - Specimen fixture, 53 - Pin, 54 - Water - cooled connection flange, 55 - Tie - rod sealing flange, 56 - Tie - rod;

[0040] 6 - Deformation measurement chamber;

[0041] 7 - Water - cooled baffle of deformation measurement chamber;

[0042] 8 - Water - cooled joint;

[0043] 9 - Electrode support. Specific implementation mode

[0044] Although the above - mentioned embodiments have been described in the text of the specification and drawings of this application, the scope of patent protection of this application cannot be limited thereby. Any technical solutions obtained by equivalent structure or equivalent process substitution or modification based on the substantial concept of this application and using the content recorded in the text of the specification and drawings of this application, as well as those directly or indirectly implementing the technical solutions of the above - mentioned embodiments in other related technical fields, are all included in the scope of patent protection of this application.

[0045] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above - mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0046] In the first aspect of this application, a fatigue testing device for material property testing is provided. As Figures 1 - 3 shown, the fatigue testing device for material property testing includes a test environment chamber 1, a radiation heating furnace 2 disposed in the test environment chamber 1, and a specimen fixture 52 that can withstand high temperatures. The specimen fixture 52 can be made of alloy material so that the specimen fixture 52 can meet the corresponding high - temperature resistance performance. Specifically, the test environment chamber 1 can provide a vacuum and airtight environment. The radiation heating furnace 2 includes a heat - insulating and heat - retaining structure and a radiation heating module 22 disposed in the heat - insulating and heat - retaining structure. Among them: The specimen fixture 52 is disposed beside the radiation heating module 22, and the specimen fixture 52 is used to clamp the material sample 51 to be tested.

[0047] In an actual application scenario, the test environment chamber 1 provides a relatively sealed and ultra-high temperature environment with vacuum (inflation) for the test of the material specimen 51 to ensure that the material specimen 51 can be tested under satisfied conditions. Among them, as Figure 2 shown, the material specimen 51 can be configured as a rod-shaped specimen. Both ends of the material specimen 51 can be made into dumbbell-shaped inclined surfaces so that the material specimen 51 with dumbbell-shaped inclined surfaces can be clamped by the specimen fixture 52. The two ends of the material specimen 51 can also be widened, and an arc transition can be added at the widened positions at both ends to reduce stress concentration and prevent the material specimen 51 from brittle fracture, so that the specimen fixture 52 is more suitable for the material specimen 51 with this structure.

[0048] For the fatigue test device in the above embodiment, by configuring the test environment chamber 1 with a sealed and vacuum environment, the radiation heating furnace 2 provided in the test environment chamber 1 and the specimen fixture 52 that can withstand high temperatures, and configuring the radiation heating furnace 2 with a heat insulation and preservation structure and a radiation heating module 22 provided in the heat insulation and preservation structure, and arranging the specimen fixture 52 beside the radiation heating module 22, the heat insulation and preservation structure can concentrate the heat of the radiation heating module 22 in the heat insulation and preservation structure in the sealed vacuum environment. It can be understood that a heat insulation and preservation barrier is set in the vacuum environment, so that while the heat of the radiation heating module 22 is more concentrated, the influence of the heat on the test environment chamber 1 can be reduced, thereby improving the durability and service life of the test environment chamber 1 and the test efficiency of the fatigue test device.

[0049] In one embodiment, as Figure 2 shown, the heat insulation and preservation structure in the above embodiment includes a main heat insulation structure 211, an upper heat insulation structure 212 and a lower heat insulation structure 213. The main heat insulation structure 211 is circular. The upper heat insulation structure 212 and the lower heat insulation structure 213 are respectively installed at both ends of the main heat insulation structure 211. Among them: the main heat insulation structure 211, the upper heat insulation structure 212 and the lower heat insulation structure 213 are all made of stainless steel materials and all include multiple layers of stainless steel sheets, specifically including but not limited to, for example, 2 layers, 4 layers, 6 layers, 8 layers and more than 10 layers of stainless steel sheets. Exemplarily, for example, the main heat insulation structure 211 can include 8 layers of stainless steel sheets, and both the upper heat insulation structure 212 and the lower heat insulation structure 213 can include 4 layers of stainless steel sheets to improve the heat insulation performance of the main heat insulation structure 211. During specific installation, the heat insulation and preservation structure can be fixed on the radiation heating furnace 2, and the radiation heating furnace 2 is installed on the door of the test environment chamber 1 (such as the front door 11 or the rear door 12 mentioned in the following embodiment).

[0050] In the heat insulation structure in the above embodiments, it is further disclosed that the main heat insulation structure 211 is configured as a circular shape or an oval shape, which can make the main body of the heat insulation structure configured as a circular shape or an oval shape, so that the corresponding specimen fixture 52 and the material specimen 51 can be placed in the circular or oval main heat insulation structure 211, and further shielded by the upper heat insulation structure 212 and the lower heat insulation structure 213, so as to improve the heat insulation performance of the heat insulation structure while further improving the heat preservation performance of the structure.

[0051] In one embodiment, the radiation heating module 22 mentioned in the above embodiments includes a first heating module and a second heating module arranged in a split manner. A split structure can be adopted between the first heating module and the second heating module, that is, they are heated separately by the first heating module and the second heating module. The first heating module and the second heating module have a preset distance. The specimen fixture 52 is arranged between the first heating module and the second heating module, and the first distance between the specimen fixture 52 and the first heating module is equal to the second distance between the specimen fixture 52 and the second heating module. Among them, the corresponding heating module can be formed by winding a resistance wire into a spiral shape and installing it in the groove of the muffle tube, and the muffle tube groove is fixed on the upper and lower end covers of the heat insulation structure by the muffle tube seat. Both ends of the heating element of each heating module are respectively fixed to the corresponding electrode support 9, and a two-stage heating module structure is formed in total. The electrode support 9 is insulated by an insulating sleeve and sealed by a vacuum rubber ring, and the electrode support 9 is installed on the door of the test environment box 1 by an electrode rod. The resistance wire can be selected as an iron-chromium-aluminum alloy.

[0052] In the radiation heating module 22 in the above embodiments, through the further configured first heating module and second heating module, the first heating module and the second heating module can be configured in a split manner, and the heating elements are placed on the side close to each other, so that the specimen fixture 52 is placed between the heating elements corresponding to the first heating module and the second heating module. In this way, the heating performance of the radiation heating module 22 can be increased, and since the specimen fixture 52 is at an equal distance from the corresponding heating module respectively, the heating temperature can be made more balanced.

[0053] In one embodiment, as mentioned in the above embodiments, the material specimen 51 can be configured in a rod shape, and the specimen fixture 52 includes a chuck. Correspondingly, the chuck can be provided with an upper chuck and a lower chuck, and the upper chuck and the lower chuck respectively clamp both ends of the material specimen 51. Specifically, as Figure 1As shown, the test environment chamber 1 specifically includes a chamber body, a front door 11 and a rear door 12 which are respectively and hermetically arranged on both sides of the chamber body. The fatigue test device further includes tie rods 56 which are respectively and dynamically sealed on the chamber body, such as an upper tie rod arranged above and a lower tie rod arranged below. Specifically, it can be realized by correspondingly arranging a tie rod sealing flange 55. Specifically, the installation of the upper tie rod and the lower tie rod on the chamber body can adopt a multi-layer gasket sealing form. An upper tie rod can be configured above the chamber body, and a lower tie rod can be configured below the chamber body. The upper tie rod and the lower tie rod can respectively connect the inside and the outside of the chamber body. The upper tie rod and the lower tie rod can respectively rotate (twist) and / or stretch on the chamber body. Exemplarily, for example, the upper tie rod and the lower tie rod can respectively perform axial stretching (which can be understood as up-and-down stretching) on the chamber body, or the upper tie rod and the lower tie rod can also respectively rotate (which can be understood as left-and-right rotation) on the chamber body, so as to further drive the corresponding fixture to perform tensile torsion through the rotation of the corresponding tie rod. Or a combination of rotation and stretching can also be adopted, that is, the upper tie rod and the lower tie rod can respectively rotate (twist) and stretch on the chamber body, so as to drive the specimen fixture 52 to perform relative rotation (torsion) or stretching and a combination of both through the corresponding upper tie rod and lower tie rod, so that the fatigue test device can meet the high-temperature and vacuum environment. While realizing the axial tensile load on the material specimen, the specimen fixture can be configured to have an anti-rotation structure as a whole, and can also apply a torsional load to the specimen, further improving the diversity of the test of the material specimen 51; wherein, in order to improve the convenience of the installation and disassembly of the tie rod 56 and the specimen fixture 52 inside the chamber body, further, one end of the upper tie rod can be detachably connected to one end of the upper chuck, and the other end of the upper tie rod can be connected to the upper rod of the external fatigue test equipment. The upper rod of the external fatigue test equipment can drive the upper tie rod to rotate and / or stretch; one end of the lower tie rod is detachably connected to one end of the lower chuck, and the other end of the lower tie rod can be connected to the lower rod of the external fatigue test equipment. The lower rod of the external fatigue test equipment can drive the lower tie rod to rotate and / or stretch. Among them, the way of detachable installation of one end of the tie rod 56 and one end of the fixture can be realized by setting connecting parts such as pins 53 or plug pins. Among them, in order to facilitate the installation of the test environment chamber 1, an environment chamber bracket 4 can also be configured, so as to facilitate the matching installation and use with the external fatigue test device through the environment chamber bracket 4.

[0054] In addition, the corresponding tie rods 56 on the chamber body can be made of alloy materials, that is, the upper tie rod and the lower tie rod can be made of alloy materials, so as to meet the corresponding high-temperature resistance performance. A water-cooling structure can also be configured correspondingly, such as Figure 2 the water-cooling connection flange 54 shown, so as to realize timely cooling through the following cooling system.

[0055] The fatigue testing device in the above embodiments is further configured with a pull rod 56 that can adapt to an external fatigue device for rotation or stretching, enabling the configuration of an external fatigue testing device for additional performance testing. The fatigue testing device can be a rotation test, a stretching test, a compression test, etc., to further improve the performance of the fatigue testing device and the comprehensiveness of the test.

[0056] In one embodiment, for the convenience of observing the test environment, specifically, as Figure 1 shown, observation windows can be provided on both the front door 11 and the rear door 12. Specifically, observation windows such as blue-light transparent ones can be configured for the front door 11 and the rear door 12 respectively; a deformation measurement chamber 6 communicating with the specimen fixture 52 is also opened on the box body. The deformation measurement chamber 6 is used to install a side-inserted extensometer, so that the side-inserted extensometer measures the deformation amount of the material specimen 51 within the gauge length and calculates the average value, thereby confirming the performance of the material specimen 51 according to the corresponding average value. Specifically, the deformation measurement chamber 6 can be opened on both sides of the box body, that is, the method of using a double-sided side-inserted high-temperature extensometer to measure the specimen deformation is adopted, which can realize the stable use of the high-temperature extensometer on high-temperature and live specimens; a water-cooling inlet for the extensometer and a water-cooling baffle 7 for the deformation measurement chamber are also provided on the deformation measurement chamber 6 to cool the side-inserted extensometer through the water-cooling inlet for the extensometer and can be blocked by the water-cooling baffle 7 for the deformation measurement chamber. Specifically, it can be realized in cooperation with the cooling device mentioned in the following embodiments to cool the high-temperature extensometer through the water-cooling inlet for the extensometer. In addition, for the convenience of observing the measurement situation, a measurement window can also be provided in the deformation test chamber.

[0057] In one embodiment, the box body, the front door 11, and the rear door 12 all adopt a double-layer water-cooling structure. The double-layer water-cooling structure is made of stainless steel material. To cooperate with the corresponding water-cooling structure for heat dissipation and temperature reduction, the fatigue testing device can also include a water-cooling system. The water-cooling system includes a cold water device and a water distribution device connected to the cold water device. The water distribution device is provided with multiple cooling water channels, and a corresponding copper ball valve is provided on each cooling water channel. The cooling water channels are respectively used to cool the corresponding water-cooling structures. Exemplarily, for the box body, multiple evenly distributed water-cooling joints 8 can be provided on the box body. For example, 8 water-cooling joints 8 can be arranged at a position of 45° around the box body to achieve water-cooling temperature reduction through the corresponding water-cooling joints 8, or corresponding water-cooling joints 8 can be provided at the corresponding positions of the front door 11 or the rear door 12 and the mechanisms that need to be cooled.

[0058] Among them, the water separation device includes a water inlet mechanism and a water return mechanism; the water inlet mechanism includes a water inlet tank, a multi-channel water inlet passage connected to the water inlet tank, a water inlet control valve provided on the corresponding water inlet passage, and an electric contact pressure gauge for controlling the corresponding water inlet pressure; the water return mechanism includes a water return tank, a multi-channel water return passage connected to the water return tank, a water return control valve provided on the corresponding water return passage, and a water flow rotor meter for displaying the water flow rate of the water return. Correspondingly, the water-cooled structure can be provided with corresponding water-cooled input and output ports, so that the multi-channel water inlet passages are respectively connected to the corresponding water-cooled input ports, and the multi-channel water return passages are respectively connected to the corresponding water-cooled output ports, so that the configured water-cooled system can realize the implementation of cooling the test environment chamber 1. It should be noted that, in addition to cooling the water-cooled structure on the test environment chamber 1, the water-cooled system can also cool the water-cooled structure, such as the specimen fixture 52 or the pull rod 56 and the extensometer. To avoid redundancy, it will not be elaborated here.

[0059] The test environment chamber 1 in the above embodiment further discloses a water-cooled structure and a water-cooled system provided for the fatigue test device, which can enable the test environment chamber 1 to be configured with a corresponding water-cooled system, and can realize the real-time heat dissipation of the test environment chamber 1, so as to improve the use stability of the fatigue test device.

[0060] In one embodiment, as Figures 1 - 3 shown, a vacuum pumping and venting pipeline 3 is further provided on the box body, and a vent valve is also provided on the vacuum pumping and venting pipeline 3; specifically, the fatigue test device further includes a vacuum pumping device, and the vacuum pumping device includes a two-stage pump vacuum device, a vacuum pipeline, a vacuum manual regulating valve provided on the vacuum pipeline, and a vacuum measuring instrument (specifically, a digital display vacuum measuring instrument can be used to measure the vacuum degree). The vacuum pipeline includes a vacuum bellows. One end of the vacuum bellows is hermetically connected to the vacuum pumping and venting pipeline 3, and the other end of the vacuum bellows is hermetically connected to the two-stage pump vacuum device; specifically, the two-stage pump vacuum device includes a mechanical pump for pumping low vacuum and a molecular pump for high vacuum, that is, a two-stage vacuum device is configured to first pump low vacuum through a directly connected mechanical pump and then pump high vacuum through a molecular pump. In practical applications, the two-stage vacuum device can adopt an MDP-1800 type vacuum unit, that is, a pumping system composed of a mechanical pump and a molecular pump. The vacuum pipeline can be further divided into a front-stage pipeline and a rear-stage pipeline. One end of the front-stage vacuum pipeline is connected to the test environment chamber 1, and one end of the rear-stage vacuum pipeline is connected to the outlet of the diffusion pump of the unit. A high-vacuum manual regulating valve (which can be a manual butterfly valve) is installed on the pipeline flange between the front-stage vacuum pipeline and the test environment chamber 1.

[0061] Specifically, the fatigue test device may further include an air charging and discharging device, an electric contact vacuum pressure gauge installed on the box body, a first high-vacuum fine-tuning valve provided on the electric contact vacuum pressure gauge, and a second high-vacuum fine-tuning valve provided on the vacuum pipeline, where: The air charging and discharging device includes an air charging bottle. Specifically, the charging pressure of the air charging bottle can be controlled according to the real-time pressure condition of the electric contact vacuum pressure gauge; the first high-vacuum fine-tuning valve is connected to the automatic air release solenoid valve on the air charging bottle, and the second high-vacuum fine-tuning valve is connected to the pressure reducing valve on the air charging bottle.

[0062] Based on the vacuum pumping and air release pipelines 3 provided on the box body, further setting a vacuum pumping device and an air charging and discharging device for the fatigue test device in the above embodiment can make the functions of the fatigue test device more complete, and can enable air charging and discharging according to the real-time displayed air pressure condition. The correspondingly configured vacuum fine-tuning valve can precisely adjust the air valve to improve the precise testing of the fatigue test device.

[0063] In one embodiment, the fatigue test device further includes a temperature controller and a plurality of thermocouples. The box body is also provided with a thermocouple connection channel for thermocouple temperature measurement. The thermocouple connection channel can at least communicate with and be close to the position of the material specimen 51. Through the thermocouple connection channel, the corresponding thermocouple can measure the real-time ambient temperature at a preset position inside the box body; specifically, the thermocouple connection channel can be arranged on both sides of the box body. One or more (such as three) thermocouples can be arranged in each thermocouple connection channel. For example, a standard K-type thermocouple can be arranged. The K-type thermocouple is configured to monitor the real-time ambient temperature at a necessary position inside the monitoring box and send it to the temperature controller correspondingly. The necessary position can be specifically configured according to the actual position to be monitored. For example, it is at least arranged inside the heat insulation structure. Among them, the temperature controller is used to control the heating temperature of the radiation heating module 22 according to the real-time ambient temperature. For example, it controls the input current of the corresponding heating module according to the real-time heating temperature to achieve different heating temperatures through the control of the current. Exemplarily, the temperature controller is used to control the conduction amplitude of the thyristor of the heating radiation module according to the phase-shifted trigger method, thereby adjusting the output power, and finally controlling the voltage across the heating radiation module to achieve the purpose of adjusting the ambient temperature of the test environment box 1, especially the ambient temperature inside the heat insulation structure.

[0064] In the above embodiment, by configuring the temperature controller and the corresponding thermocouple temperature measurement and temperature control device, it is possible to realize the closed-loop control of the temperature controller according to the corresponding real-time ambient temperature through the temperature measurement method of the corresponding multiple thermocouple temperature measurement and temperature control devices.

[0065] The second aspect of the present application further provides a test system. Among them, the test system includes the fatigue test device for material property testing in any of the embodiments of the first aspect above. Specifically, the test system may include the external fatigue test equipment mentioned in the above embodiments. Based on the configured fatigue test device, the test system may further include an external fatigue test equipment. The fatigue test equipment may be configured with a corresponding rotation (or torsion) mechanism, or a stretching mechanism, or a compression mechanism. The corresponding rotation mechanism, stretching mechanism, or compression mechanism may be configured to connect to the corresponding upper and lower rods, so that they are connected to the pull rod 56 reserved in the box body of the test environment box 1 through the corresponding upper and lower rods.

[0066] It can be understood that based on the many advantages of the fatigue test device for material property testing in the embodiments of the first aspect above, the test system also has many advantages. To avoid redundancy, they will not be elaborated here.

[0067] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0068] The above specific embodiments of the present invention do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A fatigue testing device, characterized in that, The fatigue testing device includes a test environment chamber capable of providing a vacuum and a sealed environment, a radiation heating furnace disposed in the test environment chamber, and a specimen fixture capable of withstanding high temperatures. The radiation heating furnace includes a heat insulation structure and a radiation heating module disposed in the heat insulation structure, wherein: The specimen fixture is disposed beside the radiation heating module, and the specimen fixture is used to clamp a material specimen to be tested; The heat insulation structure includes a main heat insulation structure, an upper heat insulation structure, and a lower heat insulation structure. The main heat insulation structure is circular, and the upper heat insulation structure and the lower heat insulation structure are respectively installed at both ends of the main heat insulation structure, wherein: The main heat insulation structure, the upper heat insulation structure, and the lower heat insulation structure are all made of stainless steel material and all include multiple layers; The radiation heating module includes a first heating module and a second heating module arranged in an opposed manner. There is a preset distance between the first heating module and the second heating module. The specimen fixture is disposed between the first heating module and the second heating module, and a first distance between the specimen fixture and the first heating module is equal to a second distance between the specimen fixture and the second heating module; The material specimen is configured in a rod shape. The specimen fixture includes an upper chuck and a lower chuck, and the upper chuck and the lower chuck respectively clamp both ends of the material specimen; The test environment chamber includes a box body, a front door and a rear door respectively sealed on both sides of the box body. The fatigue testing device further includes an upper pull rod and a lower pull rod respectively movably sealed on the box body. The upper pull rod and the lower pull rod can respectively rotate and / or stretch on the box body; One end of the upper pull rod is detachably connected to one end of the upper chuck, and the other end of the upper pull rod can be connected to the upper rod of an external fatigue testing device. The upper rod of the external fatigue testing device can drive the upper pull rod to rotate and / or stretch; One end of the lower pull rod is detachably connected to one end of the lower chuck, and the other end of the lower pull rod can be connected to the lower rod of an external fatigue testing device. The lower rod of the external fatigue testing device can drive the lower pull rod to rotate and / or stretch; A vacuum pumping and venting pipeline is further provided on the box body, and a vent valve is further provided on the vacuum pumping and venting pipeline; The fatigue testing device further includes a vacuum pumping device. The vacuum pumping device includes a two-stage pump vacuum device, a vacuum pipeline, a vacuum manual regulating valve disposed on the vacuum pipeline, and a vacuum measuring instrument. The vacuum pipeline includes a vacuum bellows. One end of the vacuum bellows is hermetically connected to the vacuum pumping and venting pipeline, and the other end of the vacuum bellows is hermetically connected to the two-stage pump vacuum device; The fatigue testing device further includes a gas charging and discharging device, an electric contact vacuum pressure gauge installed on the box body, a first high-vacuum fine-tuning valve disposed on the electric contact vacuum pressure gauge, and a second high-vacuum fine-tuning valve disposed on the vacuum pipeline, wherein: The gas charging and discharging device includes an air charging bottle, and the electric contact vacuum pressure gauge is used to control the charging pressure of the air charging bottle; The first high-vacuum fine adjustment valve is connected to the automatic deflation solenoid valve on the gas charging bottle. The second high-vacuum fine adjustment valve is connected to the pressure reducing valve on the gas charging bottle.

2. The fatigue testing device according to claim 1, wherein, Observation windows are provided on both the front door and the rear door. A deformation measurement chamber communicating with the specimen fixture is also provided on the box body. The deformation measurement chamber is used to install a side-inserted extensometer so that the side-inserted extensometer can measure the deformation of the material specimen within the gauge length. An extensometer water cooling inlet is also provided on the deformation measurement chamber to cool the side-inserted extensometer through the extensometer water cooling inlet. A measurement window is also provided on the deformation measurement chamber.

3. The fatigue testing device according to claim 1, wherein The box body, the front door, and the rear door all adopt a double-layer water cooling structure. The double-layer water cooling structure is made of stainless steel. The fatigue test device also includes a water cooling system. The water cooling system includes a cold water device and a water distribution device connected to the cold water device. The water distribution device is provided with multiple cooling water channels, and a corresponding copper ball valve is provided on each cooling water channel. The cooling water channels are respectively used to cool the corresponding water cooling structures.

4. The fatigue test device according to any one of claims 1 to 3, characterized in that, The fatigue test device also includes a temperature controller and multiple thermocouples. A thermocouple connection channel for the thermocouples to measure temperature is also provided on the box body. The thermocouple connection channel can at least communicate with and be close to the position of the material specimen. Through the thermocouple connection channel, the corresponding thermocouple can measure the real-time ambient temperature at a preset position inside the box body. The temperature controller is used to control the heating temperature of the radiation heating module according to the corresponding real-time ambient temperature.

5. A test system, characterized in that, The test system includes the fatigue test device according to any one of claims 1-4.

Images