A high-temperature pressure-bearing hydrogen mixed in-situ creep fatigue test system based on digital twinning

Abstract

The application discloses a high-temperature pressure-bearing hydrogen mixed in-situ creep fatigue test system based on digital twinning, which comprises a host and environment system, a digital twinning control platform, a vacuum pump, an argon source, a hydrogen source and a data acquisition system; the host and environment system comprises a host and an environment system, the host comprises a host support and a load applying device, a test piece is borne in the environment system, and the load applying device is used for applying mechanical load to the test piece in the environment system; the environment system comprises a heating device and a test piece containing device, the test piece is placed in the test piece containing device, the high-temperature environment is provided by the heating device, and the test piece containing device is connected with the argon source, the hydrogen source and the vacuum pump; the digital twinning control platform is used for controlling the safe operation and maintenance of the whole high-temperature pressure-bearing hydrogen environment, and the data acquisition system is used for collecting experimental data; the high-temperature pressure-bearing hydrogen mixed in-situ creep fatigue test system based on digital twinning can realize in-situ creep fatigue performance test of a material under a high-temperature hydrogen mixed environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of test piece mechanical property testing, in particular to a high-temperature pressure-bearing hydrogen mixed in-situ creep fatigue test system based on digital twinning. BACKGROUND

[0002] As a clean and environmentally friendly energy, hydrogen energy has become an important direction for low-carbon and efficient development, and has a great promoting effect on the development of aviation power field. Many aviation research institutes have also begun to study hydrogen energy aircraft and hydrogen mixed gas turbines. Currently, there are two technical routes: one is to ignite hydrogen in an improved combustion chamber to generate power directly; the other is to develop hydrogen fuel cells to connect electric motors to provide power for aircraft. Research shows that direct use of hydrogen fuel can reduce the impact of aircraft exhaust gas on the climate by 50%-75%, which has become the focus of hydrogen energy aviation research.

[0003] However, when metals are used in hydrogen environment for a long time, hydrogen embrittlement will inevitably occur, resulting in a decrease in the mechanical properties of the metal and a decrease in the service life. This poses a huge safety hazard to the use of hydrogen energy in the field of aerospace power, and seriously restricts the application and popularization of hydrogen energy. In order to ensure the safe and reliable operation of hydrogen energy equipment, it is necessary to test and evaluate the mechanical properties of metal materials in a hydrogen environment. There are currently a variety of material mechanical property testing systems in a hydrogen environment, involving material fracture toughness, yield strength, and creep fatigue performance. However, the existing technology cannot perform in-situ creep fatigue performance testing when testing the mechanical properties of test pieces. SUMMARY

[0004] The purpose of the present application is to provide a high-temperature pressure-bearing hydrogen mixed in-situ creep fatigue test system based on digital twinning to solve the problems existing in the prior art and to achieve in-situ creep fatigue performance testing of materials in a high-temperature hydrogen mixed environment.

[0005] To achieve the above purpose, the present application provides the following solutions:

[0006] The present application provides a high-temperature pressure-bearing hydrogen mixed in-situ creep fatigue test system based on digital twinning, comprising a host computer and environment system, a digital twinning control platform, a vacuum pump, an argon source, a hydrogen source, and a data acquisition system.

[0007] The host and environment system comprises a host and an environment system, the host comprises a host support and a load applying device, the environment system bears a test piece, the environment system is installed in the host support, and the load applying device is used for applying mechanical load to the test piece in the environment system; the environment system comprises a heating device and a test piece containing device, the test piece is placed in the test piece containing device, and a high-temperature environment is provided by heating through the heating device; the test piece containing device is connected with the argon source, the hydrogen source and the vacuum pump, the vacuum pump is used for vacuumizing the inside of the test piece containing device, and the argon source and the hydrogen source are used for introducing required gas into the test piece containing device.

[0008] The digital twin control platform is used for controlling the safe operation and maintenance of the entire high-temperature pressure hydrogen environment, and the data acquisition system is used for acquiring experimental data.

[0009] Preferably, the host support comprises a bottom plate, a connecting plate, a stand and an upper horizontal plate, the connecting plate is arranged on the top of the bottom plate, two stand are arranged on the two sides of the top of the bottom plate, and the upper horizontal plate is arranged on the top of the two stands.

[0010] Preferably, the load applying device is an actuator.

[0011] Preferably, the test piece containing device comprises a safety chamber and a glass cover, the safety chamber is connected with the connecting plate through a base at the bottom, a door and a door frame connected with the door are arranged at the front end of the safety chamber, an observation window one is arranged on the door, the test piece is sealed and placed in the glass cover, and the glass cover is arranged in the safety chamber.

[0012] Preferably, the heating device is a heating furnace sleeved outside the glass cover, and an observation window two opposite to the observation window one is arranged on the heating furnace.

[0013] Preferably, a lower flange base is arranged at the bottom of the glass cover, the lower flange base is connected with the bottom plate through a connecting hole in the surrounding of the connecting plate by a screw one, an upper flange base is arranged at the top of the glass cover, a flange at the bottom of a bellows is connected with the top of the upper flange base by a screw two, a pull rod is connected with the top of the bellows, and a connecting shaft at the bottom of the actuator is connected with the top of the pull rod through a universal shaft.

[0014] The upper clamp and the lower clamp are arranged inside the glass cover, the two ends of the test piece are connected between the upper clamp and the lower clamp through a connecting pin, the bottom of the lower clamp is connected with the lower flange seat through a sensor, the sensor is used for collecting the mechanical load applied to the test piece and transmitting the collected mechanical load to the data acquisition system, and the top of the upper clamp is connected with the pull rod through a connecting rod after penetrating through the bellows.

[0015] Preferably, the upper flange seat and the lower flange seat are respectively provided with upper and lower sealing pads at the connection with the glass cover.

[0016] Preferably, the inner cavity of the glass cover is connected with the vacuum pump, the hydrogen source and the argon source through pipelines respectively, and flow control valves and flow sensors are arranged on the pipelines between the hydrogen source, the argon source and the glass cover.

[0017] Preferably, the flow sensor, the data acquisition system and the air environment sensor are connected with the digital twin control platform, the test environment is detected in real time through the digital twin control platform, the test state is mapped, and then the test parameters are adjusted; when the air environment sensor detects hydrogen leakage, the digital twin control platform controls the flow control valve to automatically close the argon and hydrogen pipelines and stop the test, so as to ensure the safety and reliability of the test.

[0018] Preferably, it also includes an in-situ observation instrument, which monitors the test piece inside the glass cover through the observation window I and the observation window II, and is used for monitoring the surface state of the test piece in real time.

[0019] The present application has the following beneficial technical effects compared with the prior art:

[0020] The high-temperature pressure-bearing hydrogen mixed in-situ creep fatigue test system based on digital twin provided by the present application sets a host with a load applying device, installs a test piece containing device containing a test piece on a host support, heats the test piece containing device through a heating device, and externally connects a vacuum pump, an argon source and a hydrogen source, so that the test piece can be loaded at the same time in the test environment, the digital twin control platform is used for controlling the safe operation and maintenance of the whole high-temperature pressure-bearing hydrogen environment, a data acquisition system is used for collecting experimental data, and the in-situ creep fatigue performance test of materials in a high-temperature hydrogen mixed environment is realized. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 It is a structural schematic diagram of a high-temperature pressure-bearing hydrogen mixed in-situ creep fatigue test system based on digital twinning in the application;

[0023] Figure 2 It is an assembly drawing of a host bracket and an environmental system in the application;

[0024] Figure 3 It is a structural schematic diagram of a host bracket in the application;

[0025] Figure 4 It is a structural schematic diagram of a safety chamber and a heating furnace and a glass cover in the safety chamber in the application;

[0026] Figure 5 It is a structural schematic diagram of a glass cover with a heating furnace in the application;

[0027] Figure 6 It is a sectional view of Figure 5 ;

[0028] In the figure: 1-host and environmental system, 101-host bracket, 102-bottom plate, 103-connection plate, 104-stand, 105-upper horizontal plate, 106-actuating cylinder; 201-environmental system, 202-safety chamber, 203-glass cover, 204-base, 205-door, 206-door frame, 207-observation window one, 208-heating furnace, 209-observation window two, 210-lower flange seat, 211-screw one, 212-upper flange seat, 213-screw two, 214-flange, 215-bellows, 216-pull rod, 217-gimbal shaft, 218-connection pin, 219-connection shaft, 220-upper chuck, 221-lower chuck, 222-sensor, 223-linkage, 224-upper sealing gasket, 225-lower sealing gasket, 226-pivot shaft;

[0029] 2-digital twinning control platform, 3-vacuum pump, 4-argon source, 5-hydrogen source, 6-data acquisition system, 7-test piece, 8-in-situ observation instrument. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0031] The purpose of the application is to provide a high-temperature pressure-bearing hydrogen mixed in-situ creep fatigue test system based on digital twinning to solve the problems in the prior art.

[0032] In order to make the above objectives, characteristics and advantages of the present application more apparent, comprehensible and easier to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0033] The high-temperature pressure hydrogen mixed in-situ creep fatigue test system based on digital twinning in the embodiment, as shown in the figure, includes a host and environment system 1, a digital twinning control platform 2, a vacuum pump 3, an argon source 4, a hydrogen source 5 and a data acquisition system 6. Figures 1-6

[0034] The host and environment system 1 includes a host and environment system 201, the host includes a host support 101 and a load applying device, and the environment system 201 carries a test piece 7 therein, the environment system 201 is installed in the host support 101, and the load applying device is used to apply mechanical load to the test piece 7 in the environment system 201; the environment system 201 includes a heating device and a test piece containing device, the test piece 7 is placed in the test piece containing device, and the test piece containing device is connected to the argon source 4, the hydrogen source 5 and the vacuum pump 3, the vacuum pump 3 is used to pump the test piece containing device, and the argon source 4 and the hydrogen source 5 are used to introduce the required gas into the test piece containing device;

[0035] The digital twinning control platform 2 is used to control the safe operation and maintenance of the entire high-temperature pressure hydrogen environment, and the data acquisition system 6 is used to acquire experimental data.

[0036] In the specific embodiment, the host support 101 is used to support the load applying device and the environment system 201, the host support 101 includes a bottom plate 102, a connecting plate 103, a vertical column 104 and an upper horizontal plate 105, the connecting plate 103 is arranged on the top of the bottom plate 102, one vertical column 104 is arranged on each side of the top of the bottom plate 102, and the upper horizontal plate 105 is installed on the top of the two vertical columns 104, the load applying device is a cylinder 106 installed on the top of the upper horizontal plate 105.

[0037] In the specific embodiment, the test piece containing device includes a safety chamber 202 and a glass cover 203, the base 204 at the bottom of the safety chamber 202 is connected to the bottom plate 102 through the connecting holes in the periphery of the connecting plate 103 by screws, the front end of the safety chamber 202 is provided with a door 205 and a door frame 206 connected to the door 205, a sealing gasket is arranged between the door 205 and the door frame 206 to ensure the sealing property, an observation window one 207 is arranged on the door 205, and the test piece 7 is sealed and placed in the glass cover 203, and the glass cover 203 is arranged in the safety chamber 202.

[0038] In the specific embodiment, the heating device is a heating furnace 208 sleeved outside the glass cover 203, and an observation window two 209 opposite to the observation window one 207 is arranged on the heating furnace 208.

[0039] ​In the embodiment, the bottom of the glass cover 203 is provided with a lower flange seat 210, the lower flange seat 210 is connected to the bottom plate 102 through a connecting hole in the surrounding connecting plate 103 by a screw 211, the top of the glass cover 203 is provided with an upper flange seat 212, the top of the upper flange seat 212 is connected to the flange 214 at the bottom of the bellows 215 through a screw 213, the top of the bellows 215 is connected to the pull rod 216, the top of the pull rod 216 is connected to the connecting shaft 219 at the bottom of the actuator cylinder 106 through the universal shaft 217, and the universal shaft 217 is hinged to the connecting shaft 219 through the pin shaft 226.

[0040] The inside of the glass cover 203 is provided with an upper clamp 220 and a lower clamp 221, the two ends of the test piece 7 are connected between the upper clamp 220 and the lower clamp 221 through a connecting pin 218, the bottom of the lower clamp 221 is connected to the lower flange seat 210 through a sensor 222, the sensor 222 is used to collect the mechanical load applied to the test piece 7 and transmit the collected mechanical load to the data acquisition system 6, and the top of the upper clamp 220 is connected to the pull rod 216 through the connecting rod 223 after passing through the bellows 215.

[0041] The connection between the upper flange seat 212 and the lower flange seat 210 and the glass cover 203 is respectively provided with an upper sealing gasket 224 and a lower sealing gasket 225.

[0042] In the embodiment, the inner cavity of the glass cover 203 is connected to the vacuum pump 3, the hydrogen source 5 and the argon source 4 through pipelines respectively, and flow control valves and flow sensors are arranged on the pipelines between the hydrogen source 5 and the argon source 4 and the glass cover 203, so as to adjust the composition of the hydrogen mixed gas.

[0043] In the embodiment, the flow sensor, the data acquisition system 6 and the air environment sensor are connected to the digital twin control platform 2, the test environment is detected in real time through the digital twin control platform 2, the test state is mapped, and then the test parameters are adjusted; the data acquisition system 6 mainly collects information such as temperature, medium pressure and load on the test piece; the air environment sensor can be installed on the roof of the laboratory to detect the hydrogen content in the air environment, so as to detect whether the hydrogen concentration reaches the explosion concentration, when the air environment sensor detects hydrogen leakage, the digital twin control platform 2 controls the flow control valve to automatically close the argon and hydrogen pipelines to stop the test, so as to ensure the safety and reliability of the test.

[0044] In the embodiment, an in-situ observation instrument 8 is also included, the in-situ observation instrument 8 monitors the test piece 7 inside the glass cover 203 through the observation window 1 207 and the observation window 2 209, and is used to monitor the surface state of the test piece in real time, including the formation and expansion of cracks on the surface of the test piece.

[0045] The high-temperature pressure-bearing hydrogen mixed in-situ creep fatigue test system based on digital twinning in the application works as follows: the test piece 7 is loaded into a glass cover, the two ends are hinged and connected with the upper chuck 210 and the lower chuck 221 through the connecting pin 218, then the glass cover 203 is installed, the door 205 of the safety chamber 202 is closed, the glass cover 203 is vacuumized through the vacuum pump 3, after the vacuumization reaches a certain vacuum degree, the hydrogen mixed gas set in advance is filled into the glass cover 203, the test piece 7 is completely placed in the hydrogen mixed medium and a certain pressure is maintained, the test piece 7 is heated at ultrahigh temperature after the test medium reaches a predetermined pressure. When the temperature and the medium pressure both meet the test requirements, the actuator cylinder 106 is started to apply mechanical load to the test sample to perform the test.

[0046] The principles and implementation manners of the present application are described by applying specific examples, and the above examples are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application ranges. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A high-temperature pressure-bearing hydrogen-mixed in-situ creep fatigue testing system based on digital twins, characterized in that: It includes the main unit and environmental system, digital twin control platform, vacuum pump, argon source, hydrogen source, data acquisition system, and air environment sensor for detecting the hydrogen content in ambient air; The host and environmental system include a host and an environmental system. The host includes a host bracket and a load application device. The environmental system carries a test specimen and is installed inside the host bracket. The load application device is used to apply a mechanical load to the test specimen within the environmental system. The environmental system includes a heating device and a test specimen holding device. The test specimen is placed in the test specimen holding device and heated by the heating device to provide a high-temperature environment. The test specimen holding device is connected to the argon gas source, the hydrogen gas source, and the vacuum pump. The vacuum pump is used to evacuate the inside of the test specimen holding device. The argon gas source and the hydrogen gas source are used to introduce the gas required for the experiment into the test specimen holding device. The digital twin control platform is used to control the safe operation and maintenance of the entire high-temperature and pressurized hydrogen environment, and the data acquisition system is used to collect experimental data. The main support frame includes a base plate, a connecting plate, columns, and an upper horizontal plate. The connecting plate is disposed on the top of the base plate. A column is disposed on each of the two sides of the top of the base plate. The upper horizontal plate is mounted on the top of the two columns. The load application device is mounted on the top of the upper horizontal plate. The load application device is an actuating cylinder. The specimen holding device includes a safety chamber and a glass cover. The bottom of the safety chamber is connected to the connecting plate via a base. The front end of the safety chamber is provided with a door and a door frame connected to the door. An observation window is provided on the door. The specimen is sealed and placed inside the glass cover, which is located inside the safety chamber. The bottom of the glass cover is provided with a lower flange seat, which is connected to the base plate by a screw passing through the connecting hole of the inner circumference of the connecting plate. The top of the glass cover is provided with an upper flange seat, which is connected to the flange at the bottom of a bellows by a screw. The top of the bellows is connected to a tie rod, and the top of the tie rod is connected to the connecting shaft at the bottom of the actuating cylinder by a universal joint. The glass cover is equipped with an upper clamp and a lower clamp. The two ends of the specimen are connected between the upper clamp and the lower clamp by connecting pins. The bottom of the lower clamp is connected to the lower flange seat through a sensor. The sensor is used to collect the mechanical load applied to the specimen and transmit the collected mechanical load to the data acquisition system. The top of the upper clamp is connected to the pull rod after passing through the bellows via a connecting rod. The inner cavity of the glass cover is connected to the vacuum pump, the hydrogen source, and the argon source via pipes. Flow control valves and flow sensors are installed on the pipes between the hydrogen and argon sources and the glass cover. The flow sensors, the data acquisition system, and the air environment sensor are all connected to the digital twin control platform. The digital twin control platform monitors the test environment in real time, maps the test status, and adjusts the test parameters accordingly. When the air environment sensor detects a hydrogen leak, the digital twin control platform controls the flow control valve to automatically close the argon and hydrogen pipes, stopping the test and ensuring its safety and reliability.

2. The high-temperature pressure-bearing hydrogen-mixed in-situ creep fatigue testing system based on digital twin as described in claim 1, characterized in that: The heating device is a heating furnace fitted outside the glass cover, and the heating furnace is provided with a second observation window opposite to the first observation window.

3. The high-temperature pressure-bearing hydrogen-mixed in-situ creep fatigue testing system based on digital twin as described in claim 1, characterized in that: An upper sealing gasket and a lower sealing gasket are respectively provided at the connection between the upper flange seat and the lower flange seat and the glass cover.

4. The high-temperature pressure-bearing hydrogen-mixed in-situ creep fatigue testing system based on digital twin according to claim 2, characterized in that: It also includes an in-situ observation instrument, which monitors the specimen inside the glass cover through observation window one and observation window two, for online real-time monitoring of the specimen surface condition.

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