High temperature high pressure fatigue test system and method

Abstract

The present disclosure relates to a high-temperature high-pressure fatigue test method, comprising: stepwise load application to a test piece by a plurality of rounds of the following steps as required by the test: stepwise heating of the test piece; pressurization of the test piece; and adjustment of mechanical load based on axial force generated by the test piece due to the pressure to apply axial force and torque required by the test; and when the load reaches full load, stopping stepwise load application and maintaining the load. Wherein the stepwise heating of the test piece is achieved by parallel heating gas circuits and / or cooling gas circuits.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine fatigue test, in particular to an energy-saving method and system in aero-engine fatigue test. BACKGROUND

[0002] The aero-engine casing is an important component in the engine structure. Different casing segments are connected in front and back, and the inner wall surface together forms a complete airflow wall surface. The inner wall surface is subjected to high-temperature and high-speed airflow erosion during work, and needs to maintain the shape under high-temperature and high-pressure conditions to ensure that the engine gas flow field meets the design requirements.

[0003] Therefore, during the working process of the engine, in order to ensure the normal work of the engine, the casing must have sufficient rigidity and strength under the working temperature environment to prevent deformation instability under high-temperature conditions. If the casing deforms and buckles, the inlet flow field flow characteristics and overall structural bearing performance of the engine will be damaged, causing the engine to vibrate, and in severe cases, the entire aircraft will vibrate and the structure will buckle and be damaged, leading to the crash of the aircraft. The complexity of these load conditions and structural bearing makes the design and evaluation of the structural strength of the casing a very critical problem, and the thermal and mechanical properties under working conditions must be tested and researched.

[0004] The casing test adopts a hot air pressure charging method to most realistically simulate the use state of the casing, but the gas heat capacity is low and the density is low. A large amount of high-temperature air is required to heat the casing to the required temperature and pressure, thereby requiring special air compression, heating, and circulating equipment, which has a huge cost.

[0005] On the other hand, during the operation of the engine, the casing is subjected to mechanical loads such as torque and axial force in addition to pressure and temperature loads. In the existing test environment, it is difficult to simultaneously apply these types of loads due to technical conditions. Usually, through equivalent conversion, the temperature load is converted and the mechanical load and pressure load are enlarged by a certain proportion, so that the actual operating state of the casing cannot be completely simulated.

[0006] Therefore, there is a need in the art for a solution that can effectively cope with the large amount of heat loss in engine fatigue testing and can simultaneously apply temperature load, pressure load and mechanical load. SUMMARY

[0007] The technical solution of the present disclosure avoids a large amount of heat loss by using the high-temperature air discharged at the back end of the high-temperature and high-pressure fatigue test as a heating heat source, and thereby can simultaneously apply temperature load, pressure load and mechanical load.

[0008] In an embodiment of the present disclosure, a high-temperature and high-pressure fatigue test method is provided, which comprises: applying step-by-step load to a test piece by a plurality of rounds of the following steps required by the test: grading heating the test piece; pressurizing the test piece; and adjusting mechanical load based on axial force generated by the test piece due to the pressure, to apply axial force and torque load required by the test; and stopping step-by-step application of the load and keeping the load when the load reaches full load.

[0009] In another embodiment of the present disclosure, grading heating the test piece is achieved by parallel heating gas paths and / or cooling gas paths.

[0010] In yet another embodiment of the present disclosure, the parallel heating gas paths are composed of a preliminary heating gas path, a medium-temperature heating gas path and a high-temperature heating gas path in parallel.

[0011] In another embodiment of the present disclosure, the parallel heating gas paths are composed of the preliminary heating gas path and parallel connection of the medium-temperature heating gas path and the high-temperature heating gas path.

[0012] In yet another embodiment of the present disclosure, grading heating the test piece is achieved by simultaneously opening the cooling gas path and any heating gas path.

[0013] In another embodiment of the present disclosure, the heat source of the preliminary heating is exhaust gas at the rear end of the test piece.

[0014] In yet another embodiment of the present disclosure, the test piece is an engine case.

[0015] In another embodiment of the present disclosure, the high-temperature and high-pressure environment where the test piece is located is completely isolated from the atmospheric environment.

[0016] In an embodiment of the present disclosure, a high-temperature and high-pressure fatigue test system is provided, which comprises: a loading subsystem, further comprising: a heating module for grading heating a test piece; a pressurizing module for pressurizing the test piece; and a mechanical load module for adjusting mechanical load based on axial force generated by the test piece due to the pressure, to apply axial force required by the test, wherein step-by-step load application of the loading subsystem to the test piece is performed by a plurality of rounds of sequential operation of the heating module, the pressurizing module and the mechanical load module required by the test.

[0017] In another embodiment of the present disclosure, grading heating the test piece by the heating module is achieved by parallel heating gas paths and / or cooling gas paths.

[0018] In yet another embodiment of the present disclosure, the parallel heating gas paths are composed of a preliminary heating gas path, a medium-temperature heating gas path and a high-temperature heating gas path in parallel.

[0019] In another embodiment of the present disclosure, the parallel heating gas paths are composed of the preliminary heating gas path and parallel connection of the medium-temperature heating gas path and the high-temperature heating gas path.

[0020] In yet another embodiment of the present disclosure, the step of heating the test piece by the heating module is achieved by simultaneously opening the cooling gas path and any one of the heating gas paths.

[0021] In another embodiment of the present disclosure, the heat source for the preliminary heating is exhaust gas from the rear end of the test piece.

[0022] In yet another embodiment of the present disclosure, the test piece is an engine case.

[0023] In another embodiment of the present disclosure, the high-temperature and high-pressure environment in which the test piece is located is completely isolated from the atmospheric environment.

[0024] This summary is provided to introduce some concepts of the following detailed description in a simplified form. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above summary of the present disclosure and the following detailed description of the present disclosure will be better understood when read in conjunction with the accompanying drawings, in which like reference numerals refer to identical or similar elements in the various figures. It is noted that the figures are merely schematic and are not drawn to scale. One of ordinary skill in the art will appreciate the many possible combinations and variations that are possible in the present disclosure, and the exemplary embodiments described herein will be given to convey the substance of the present disclosure from which many modifications will be readily apparent.

[0026] Figure 1 A schematic diagram of a high-temperature and high-pressure fatigue test system according to an embodiment of the present disclosure is shown.

[0027] Figure 2 A schematic diagram of a high-temperature and high-pressure fatigue test system according to another embodiment of the present disclosure is shown.

[0028] Figure 3 A flowchart of a high-temperature and high-pressure fatigue test method according to an embodiment of the present disclosure is shown.

[0029] Figure 4 A block diagram of a high-temperature and high-pressure fatigue test system according to an embodiment of the present disclosure is shown.

[0030] Figure 5 A piping diagram of a high-temperature and high-pressure fatigue test system according to an embodiment of the present disclosure is shown.

[0031] Figure 6 An assembly diagram of an engine case according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0032] In order to make the above objectives, features and advantages of the present disclosure more apparent, the specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0033] Many specific details are set forth in the following description in order to provide a thorough understanding of the present disclosure. However, the present disclosure can be practiced according to other embodiments that are not specifically described herein, and the present disclosure is not limited to the specific embodiments described herein.

[0034] There are many life-limited parts in an aircraft engine, for example, the aircraft engine case is a life-limited part. According to regulations, the maximum allowable flight cycles of each life-limited part of the engine in the use limit need to be specified.

[0035] Taking the combustion chamber case as an example, the temperature inside the case can be as high as 700°C or more, and the maximum pressure can reach 4Mpa. If the case is subjected to a cycle test by high-temperature and high-pressure gas, there is a process of charging, holding and discharging. In the charging process, the cold air is usually heated and pressurized by a heater before being charged into the case; and the discharged gas is usually cooled by a heat exchanger before being directly discharged to the atmosphere. A case fatigue test usually lasts for several months, so a lot of heat is lost during the exhaust process.

[0036] During the operation of the aircraft engine, the case is subjected to not only pressure and temperature loads, but also mechanical loads such as torque and axial force. The high-temperature and high-pressure fatigue test of the engine case needs to be subjected to life assessment.

[0037] In the existing test environment, the technical conditions are limited, and it is difficult to simultaneously apply these types of loads. Usually, the temperature load is converted by equivalent conversion method, and the mechanical load and pressure load are enlarged by a certain proportion, which cannot completely simulate the actual operating state of the case.

[0038] How to improve the loading efficiency and reduce the energy consumption in the high-temperature and high-pressure fatigue test is a problem to be solved in the field.

[0039] The present disclosure proposes to divide the test piece into several stages and heat it in stages, and use the high-temperature air discharged from the rear end of the test piece as the heating heat source during the staged heating, so as to avoid a large amount of heat loss, thereby greatly reducing the time required for applying the temperature load, and thus having the ability to simultaneously apply the temperature load, the pressure load and the mechanical load.

[0040] In the present disclosure, the aircraft engine case will be taken as an example to describe the high-temperature and high-pressure fatigue test system and method. Those skilled in the art can understand that the high-temperature and high-pressure fatigue test scheme of the present disclosure is also applicable to other test pieces.

[0041] Figure 1 A schematic diagram of a high-temperature and high-pressure fatigue test system according to an embodiment of the present disclosure is shown.

[0042] As shown in Figure 1 , it is necessary to apply a high-temperature and high-pressure environment to the test piece 1000.

[0043] The test piece 1000 is placed in a high-temperature environment, and the whole is placed in an environmental chamber. Air enters from the air inlet system 102, is first subjected to preliminary heating 106, and then is subjected to medium-temperature heating 108 and / or high-temperature heating 110 as needed.

[0044] It can be understood that the test temperature is different for different test pieces 1000, so that those skilled in the art can understand that preliminary heating and medium-temperature heating can be performed as needed, or preliminary heating, medium-temperature heating and high-temperature heating are performed, or even more levels of heating are performed.

[0045] In an embodiment of the present disclosure, the preliminary heating 106 heats the air to 200-300°C, the medium-temperature heating 108 heats the air to 500-600°C, and the high-temperature heating 110 heats the air to above 850°C. After heat transfer loss, the inlet temperature of the environmental chamber in which the test piece 1000 is placed reaches above 800°C.

[0046] On the one hand, through the cooperation of the multi-stage heating system, the heating control precision can be effectively improved. In an embodiment of the present disclosure, the heating gas of each stage is delivered to the environmental chamber, so that the test piece 1000 can be gradually heated, and the temperature loading time is relatively short.

[0047] On the other hand, in the prior art, the air added to the test piece 1000 is usually high-temperature and high-pressure, thereby generating a large axial force, so that a relatively large adjustment needs to be made before the mechanical load is applied. That is, if the axial force generated by the internal pressure is too large, a pressure needs to be applied to the test piece 1000 to offset part of the axial force, so as to reduce the load to the required axial force for testing; if the axial force generated by the internal pressure is too small, a pulling force needs to be applied to the test piece 1000, so as to supplement the load to the required axial force for testing.

[0048] In fact, in the present embodiment, after the heating gas of each stage is delivered to the environmental chamber, it is circulated back for the next stage of heating.

[0049] After the heating link, pressurization 128 and mechanical loading 130 are performed. After loading is completed, the systems continue to operate to achieve load preservation.

[0050] The high-temperature and high-pressure fatigue test system according to the present embodiment also includes cooling 112 corresponding to the heating link, emergency pressure relief 116 corresponding to the pressurization link, and test piece rear-end exhaust 126.

[0051] Therefore, the high-temperature and high-pressure fatigue test system of the present disclosure can not only avoid a large amount of heat loss, but also has the ability to simultaneously apply temperature load, pressure load and mechanical load.

[0052] Figure 2A schematic diagram of a high-temperature and high-pressure fatigue test system according to another embodiment of the present disclosure is shown.

[0053] As Figure 2 shown, a high-temperature and high-pressure fatigue test system according to another embodiment of the present disclosure is similar to the high-temperature and high-pressure fatigue test system shown in Figure 1 , except that the heat source of the preliminary heating 106 comes from the test piece rear-end exhaust, so that the heat can be effectively utilized; further, the parallel heating gas path is formed by the parallel connection of the preliminary heating 106 gas path and the medium-temperature heating gas path 108 and the high-temperature heating gas path 110.

[0054] As can be understood by those skilled in the art, the test piece rear-end exhaust can be used as a heat source or a supplementary heat source for the medium-temperature heating 108 or the high-temperature heating 110. Even, it can be used as a heat source or a supplementary heat source for all or part of the levels of heating as needed.

[0055] Since the test piece rear-end exhaust is to be used as a heat source for the preliminary heating 106, the high-temperature and high-pressure fatigue test system according to the present embodiment further includes a heat cycle 120 and a test piece front-end exhaust 122.

[0056] Figure 2 The high-temperature and high-pressure fatigue test system shown includes a parallel heating gas path to achieve precise temperature control and temperature cycling:

[0057] First, the gas source is subjected to preliminary heating (temperature reaches 100-300°C);

[0058] Second, the gas source is directly subjected to high-temperature heating (temperature 600-800°C); at this stage, the medium-temperature heating gas path is closed;

[0059] Then, the high-temperature heating gas path flow is adjusted (closed), the cooling gas path flow is opened (adjusted), so that the test piece is rapidly cooled to 300-600°C; the medium-temperature heating gas path is opened and the cooling gas path is closed, so that the test piece temperature is stabilized at 300-600°C;

[0060] Then, the temperature cycle is performed in this way.

[0061] In this way, the use of medium- and high-temperature separate heaters for heating can effectively improve the test temperature control precision and speed up the temperature cycle. The cold and hot air mixing form can also be used, that is, the cooling gas path and any heating gas path are opened at the same time, to control the temperature.

[0062] Figure 3 A flowchart of a high-temperature and high-pressure fatigue test method according to an embodiment of the present disclosure is shown.

[0063] In the high-temperature and high-pressure fatigue test method according to an embodiment of the present disclosure, at 302, step-by-step load application is performed on the test piece (e.g., a brake assembly).

[0064] In this embodiment, the test load is loaded step by step, with each step being 10% of the test load. Since the temperature loading takes a long time, when each step is loaded, the temperature is first raised, and then the pressure and mechanical load are adjusted to reach the required load value of each step.

[0065] The test piece is heated step by step at 306.

[0066] In this embodiment, as shown in Figure 1 and Figure 2 The test piece is heated step by step, which includes preliminary heating, and then medium temperature heating and / or high temperature heating as needed.

[0067] Also in this embodiment, the heating gas of each step is delivered to the environmental box, so that the test piece can be heated step by step, thereby making the temperature loading take a relatively short time.

[0068] The test piece is pressurized at 308.

[0069] In this embodiment, air is pressurized to more than 5Mpa (slightly higher than the test pressure), the air is heated to the inlet of the cartridge assembly, and the pressure is reduced to the test pressure. During the test, the inlet pressure of the test piece is always kept constant, and the exhaust gas at the back end of the test piece and the heat recycling exhaust system dynamically cooperate with each other to make the pressure inside the cartridge reach dynamic balance.

[0070] The mechanical load is adjusted based on the axial force generated by the test piece at 310.

[0071] The cartridge assembly generates an axial force due to the pressure in the above steps. Based on the axial force, the mechanical load of the cartridge assembly needs to be adjusted to finally apply the axial force required by the test.

[0072] As mentioned earlier, when the axial force generated by the internal pressure is too large, the pressure is applied to the cartridge assembly to offset part of the axial force, thereby reducing the load to the axial force required by the test; when the axial force generated by the internal pressure is too small, the tension is applied to the cartridge assembly, thereby supplementing the load to the axial force required by the test.

[0073] It is determined whether the load has reached full load at 312.

[0074] At this time, it is determined whether the full load has been reached.

[0075] When it is determined at 312 that the load has reached full load, the step-by-step application of the load is stopped and the load is maintained at 316.

[0076] Therefore, the high-temperature high-pressure fatigue test method of the present disclosure avoids a large amount of heat loss by grading heating the test piece and using high-temperature air discharged from the rear end of the test piece as a heating heat source during the grading heating, thereby greatly reducing the time required for applying a temperature load, and thus has the ability to simultaneously apply a temperature load, a pressure load, and a mechanical load.

[0077] Figure 4 A block diagram of a high-temperature high-pressure fatigue test system 400 according to an embodiment of the present disclosure is shown.

[0078] As shown in Figure 4 , the high-temperature high-pressure fatigue test system 400 according to an embodiment of the present disclosure further includes a loading subsystem 402.

[0079] The loading subsystem 402 further includes a heating module 408 for grading heating the test piece, a pressurizing module 410 for pressurizing the test piece, and a mechanical load module 412 for adjusting a mechanical load based on an axial force generated by the test piece due to the pressure, to apply an axial force required for the test.

[0080] The step-by-step load application by the loading subsystem 402 to the test piece is performed by sequentially operating the heating module 408, the pressurizing module 410, and the mechanical load module 412 for a number of rounds required for the test.

[0081] When the load reaches full load, the loading subsystem 402 stops the step-by-step application of the load and maintains the load.

[0082] Figure 5 A piping diagram of a high-temperature high-pressure fatigue test system according to an embodiment of the present disclosure is shown. Figure 5 The piping system of the high-temperature high-pressure fatigue test system according to the embodiment of the present disclosure corresponds to Figure 2 .

[0083] Referring to Figure 5 , the piping system of the high-temperature high-pressure fatigue test system according to the embodiment of the present disclosure includes a 1 air intake system, an 8 preliminary heating system, a 2 medium-temperature heating system, a 3 high-temperature heating system, a 7 emergency pressure relief and exhaust system, a 4 test piece rear exhaust system, a 5 heat cycle gas path, a 6 heat cycle exhaust system, a 9 cooling gas path, and a 10 machine case assembly.

[0084] In the 1 air intake system, in addition to the devices shown in the figure, a temperature sensor, a pressure sensor, and the like are provided after the surge tank for monitoring the initial pressure of the air intake of the air flow. In addition, an air dryer and a filter should be configured according to the situation of the air source.

[0085] The following describes the pressure-temperature cycle control and emergency handling, respectively, based on the embodiment of Figure 5 .

[0086] A. Temperature control:

[0087] Temperature control is divided into fast heating and fast cooling:

[0088] - Fast heating:

[0089] Next, the air enters the 2 medium temperature heating system. In the 2 medium temperature heating system, the high pressure cold air first passes through the heat exchanger for heat exchange to be preliminarily heated: the high temperature air discharged by the test piece, after passing through the 5 heat cycle gas path, serves as the heat source of the heat exchanger, and this process heats the air to 200-300°C. After preliminary heating, the air is directly heated to the test temperature through the 3 high temperature heating system.

[0090] - Fast cooling:

[0091] Close the 2.1, 3.1, 8.1 electric valves or adjust the 3.3, 2.3, 8.2 regulating valves, open the 9.1 electric valve, and adjust the 9.2 regulating valve, so that the air from the 9 cooling gas path passes through the test piece, or after mixing with the hot air from the 3, 2, enters the test piece, so that the test piece is rapidly cooled to 300-600°C (cycle temperature valley). Close the 3.1 electric valve in the 3 high temperature heating system and the 9.1 electric valve in the 9 cooling system, and open the 2.1 electric valve in the 2 medium temperature heating system, so that the air temperature can be maintained at the temperature valley, thereby achieving cooling.

[0092] Due to the different specifications of the two heaters, accurate control can be tested for different temperature ranges.

[0093] Outside the 9 cartridge assembly, additional resistance heating systems can be arranged as needed for auxiliary heating according to the heating system capacity.

[0094] After passing through the pressure stabilizing tank, the air pressure reaches 5Mpa or above (slightly higher than the test pressure), and the air is heated to the inlet of the 9 cartridge assembly, and the pressure is reduced to the test pressure. During the test, the inlet pressure of the test piece remains unchanged, and the 4 test piece exhaust system and the 6 heat cycle exhaust system cooperate with each other to make the pressure inside the cartridge reach dynamic balance. The 6 heat cycle exhaust system is used for main pressure control, and the 4 test piece exhaust system is used for auxiliary control. During the pressurization process, the regulating valve of the 6 heat cycle exhaust system is opened, and the regulating valve of the 4 test piece exhaust system is reduced or closed, so that the heat can be effectively utilized, and the outlet pressure loss is low; during the depressurization process, the flow of the 6 heat cycle exhaust system is adjusted to the maximum, and the regulating valve of the 4 test piece exhaust system is opened as needed. The two regulating valves cooperate with each other to adjust the test frequency.

[0095] B. Emergency treatment:

[0096] If the device encounters an emergency, the emergency pressure relief and venting system can be opened 7 to open the emergency test piece pressure relief valve. At the same time, by closing 3.2 electric valve, the continuous entry of high pressure hot air is prevented.

[0097] Exhaust:

[0098] After the air in the heat cycle gas circuit is cooled and noise-reduced by the heat cycle exhaust system 6, it is discharged into the atmosphere.

[0099] Figure 6 The assembly schematic diagram of the engine brake according to an embodiment of the present disclosure is shown.

[0100] The following will be described with reference to Figure 6 Strength class test.

[0101] In the casing strength class test, torque, axial force, pressure and temperature load need to be applied to the casing. Referring to Figure 6 , the casing assembly 9 includes a test piece 9.1, a front adapter section 9.2 and a rear adapter section 9.3, which are connected by bolts, in addition to an environmental box 9.4 (with explosion-proof function), a heat insulation layer 9.6 (usually asbestos) and a cover plate 9.5 for heat insulation.

[0102] Before the test, all the hole seats on the test piece 9.1 are plugged with corresponding plugs to completely isolate the inside and outside.

[0103] The radial and axial stiffness values of the two mounting edges (9.2.2 and 9.3.2) of the front adapter section 9.2 and the rear adapter section 9.3 are not more than 20% different from the true engine structure stiffness value.

[0104] Generally, the mounting edge 9.2.1 of the front adapter section 9.2 (directly fixed to the ground) is completely constrained, and the mounting edge 9.3.1 of the rear adapter section 9.3 is free.

[0105] The casing assembly 9 is placed in the environmental box 9.4 under high temperature environment. The rear adapter section 9.3 is partially placed outside the environmental box 9.4 (with the heat insulation layer 9.6 as the dividing line), and the heat insulation layer has sufficient height. The rear adapter section 9.3 and the cover plate 9.5 are connected by bolts, so that the high pressure air is completely isolated from the atmospheric environment. The rear adapter section 9.3 in the heat insulation layer 9.6 has a plurality of gas discharge ports 9.3.3 for discharging high temperature air, and the discharged air enters the test piece rear exhaust system 4 and the heat cycle gas circuit 5.

[0106] Since the 9-cassette assembly is in a high-pressure environment, the internal pressure will generate an axial force on the 9.5 cover plate. Therefore, the 9.5 cover plate needs to be connected with the hydraulic actuator. If the axial force generated by the internal pressure is too large, a pressure needs to be applied to the 9.5 cover plate to offset part of the axial force and reduce the load to the required axial force of the test. If the axial force generated by the internal pressure is too small, a pulling force needs to be applied to the 9.5 cover plate to supplement the load to the required axial force of the test. The torque is applied on the 9.3.1 mounting edge by a pair of equal force couples (provided by the hydraulic actuator).

[0107] In this embodiment, the test load is loaded step by step during actual loading, and each step is usually 10% of the test load. Since the temperature loading takes a long time, the temperature is raised first during each step of loading, and then the pressure and mechanical load are adjusted to reach the required load value of each step.

[0108] The present disclosure proposes to avoid a large amount of heat loss by grading the heating of the test piece and using the high-temperature air discharged from the rear end of the test piece as a heating heat source during grading heating in a high-temperature high-pressure fatigue test, thereby greatly reducing the time required to apply a temperature load, thus having the ability to simultaneously apply a temperature load, a pressure load, and a mechanical load.

[0109] The various steps and modules of the high-temperature high-pressure fatigue test system and method described above can be implemented in hardware, software, or a combination thereof. If implemented in hardware, the various illustrative steps, modules, and circuits described in connection with the present disclosure can be implemented or executed with a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic components, hardware components, or any combination thereof. The general-purpose processor can be a processor, a microprocessor, a controller, a microcontroller, or a state machine, etc. If implemented in software, the various illustrative steps, modules described in connection with the present disclosure can be stored or transmitted as one or more instructions or code on a computer-readable medium. The software modules implementing the various operations of the present disclosure can reside in a storage medium, such as a RAM, a flash memory, a ROM, an EPROM, an EEPROM, a register, a hard disk, a removable disk, a CD-ROM, a cloud storage, etc. The storage medium can be coupled to the processor to enable the processor to read information from / to the storage medium and execute the corresponding program modules to implement the various steps of the present disclosure. Moreover, the software-based embodiment can be uploaded, downloaded, or remotely accessed through appropriate communication means. Such appropriate communication means include, for example, the Internet, the World Wide Web, an intranet, a software application, a cable (including an optical fiber cable), a magnetic communication, an electromagnetic communication (including RF, microwave, and infrared communication), an electronic communication, or other such communication means.

[0110] It is also noted that the embodiments can be described as a process which is depicted as a flowchart, a flow diagram, a structure diagram, or a block diagram. Although a flowchart can describe operations as a sequential process, many of the operations can be performed in parallel, or concurrently, or in any order. In addition, the order of the operations can be re-arranged.

[0111] The disclosed methods, apparatus, and systems should not be limited in any way by the above description. Rather, the present invention covers all novel and non-obvious features and aspects of various disclosed embodiments alone and in various combinations and sub-combinations thereof. The disclosed methods, apparatus, and systems are not limited to any specific aspect or feature or combination of them, nor do the any disclosed embodiments require the presence of any specific advantage or address specific or all technical problems.

[0112] The embodiments of the present application described above with reference to the drawings are merely exemplary and are not intended to limit the present application to the specific embodiments. The above-described embodiments are merely illustrative and not restrictive, and many modifications can be made by those skilled in the art without departing from the spirit of the present application and the scope of the claims, and such modifications are also within the scope of the present application.

Claims

1. A high-temperature and high-pressure fatigue test method, comprising: applying step-by-step load to a test piece by a number of rounds of the following steps as required by a test: gradually heating the test piece, wherein the gradually heating the test piece is achieved by parallel heating air paths and cooling air paths, the parallel heating air paths are formed by connecting in parallel a preliminary heating air path and a medium-temperature heating air path and a high-temperature heating air path, and the gradually heating the test piece is achieved by simultaneously opening the cooling air paths and any heating air path; pressurizing the test piece; and adjusting mechanical load based on axial force generated by the test piece due to the pressure to apply axial force and torque load required by the test; and stopping step-by-step application of the load and maintaining the load when the load reaches full load.

2. The method of claim 1, wherein the heat source of the preliminary heating is exhaust gas at the rear end of the test piece. The test piece is an engine case. The high-temperature and high-pressure environment in which the test piece is located is completely isolated from the atmospheric environment.

3. The method of claim 1, wherein, 5. A high-temperature and high-pressure fatigue test system, comprising:

4. The method of claim 1, wherein, a loading subsystem, further comprising: a heating module for gradually heating the test piece, wherein the heating module gradually heats the test piece by parallel heating air paths and cooling air paths, the parallel heating air paths are formed by connecting in parallel a preliminary heating air path and a medium-temperature heating air path and a high-temperature heating air path, and the heating module gradually heats the test piece by simultaneously opening the cooling air paths and any heating air path; a pressurizing module for pressurizing the test piece; and a mechanical load module for adjusting mechanical load based on axial force generated by the test piece due to the pressure to apply axial force and torque required by the test, wherein the step-by-step load application of the test piece by the loading subsystem is performed by a number of rounds of sequential operation of the heating module, the pressurizing module and the mechanical load module as required by the test.

6. The system of claim 5, wherein the heat source of the preliminary heating is exhaust gas at the rear end of the test piece. The test piece is an engine case. The high-temperature and high-pressure environment in which the test piece is located is completely isolated from the atmospheric environment.

7. The system of claim 5, wherein, ​ 8. The system of claim 5, wherein, ​

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