Environmental fatigue performance testing device and method for engine turbine blade tenon joint structure

Abstract

The present invention provides an environmental fatigue performance testing device and method for the tenon joint structure of an engine turbine blade. It includes a tenon joint structure fixing unit, an environmental control unit, a radial loading unit and a tangential loading unit; the tenon joint structure includes a blade root tenon simulation part and a tenon groove simulation part; the tenon joint structure fixing unit is used to fix the tenon groove simulation part; the tenon joint structure is located in a test environment, and the environmental control unit is used to control the test environment; the radial loading unit and the tangential loading unit are both movably connected to the blade root tenon simulation part, and are respectively used to apply centrifugal force and tangential force to the blade root tenon simulation part. The tangential loading unit includes two arc-shaped push rods to ensure that the force applied during the experiment is always in the tangential direction. The present invention can simulate the fatigue damage process of the engine blade tenon joint structure under real working conditions in the laboratory, and provides a new simulation experimental device and method for studying the fatigue damage mechanism of the blade.

Description

Technical Field

[0001] The invention relates to the field of material fatigue performance testing, and in particular to an environmental fatigue performance testing device and method for a tenon joint structure of an engine turbine blade. Background Art

[0002] Blade structures are involved in aircraft engine or gas turbine technology, including compressor blades and turbine blades. These blades are usually installed on the compressor disk or turbine disk connected to the engine main shaft through a tenon structure and are important components of the engine. The reliability and safety life of these blades play a key role in the reliability and life of the entire engine.

[0003] Since the blades have high operating temperatures, large service loads, and slight vibrations, special attention must be paid to the fatigue performance of the blades during design. In particular, the area where the tenon and the tenon groove of the blade contact each other often suffers from micro-motion fatigue damage at high temperatures. Therefore, it is necessary to conduct environmental fatigue tests on the tenon structure of the blades. However, due to the complex structure of the engine itself, high operating temperature, and high spindle speed, conducting relevant fatigue tests on the engine has problems such as difficulty in installing sensors and huge costs, making it impossible to conduct the tests. The prior art also lacks methods and devices for simulating fatigue tests on blade tenon structures.

[0004] Considering the actual working conditions of the blades, the loads they are subjected to during use are mainly aerodynamic loads along the tangential direction of rotation and centrifugal loads along the diameter of the wheel, that is, the forces on the tenon structure are tangential and radial forces. In the prior art (such as 202011637346.4), the test simulation of the forces on the tenon structure has a fixed loading structure in the vertical direction, resulting in an angle between the simulated radial force and the radial direction, and it is impossible to prove that it is always in the radial direction. In addition, the prior art replaces the tangential force loading with horizontal force loading, which is inconsistent with the actual working conditions.

[0005] In view of this, it is necessary to design an improved environmental fatigue performance testing device and method for engine blade tenon joint structures to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is: in order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide an environmental fatigue performance testing device and method for an engine blade tenon structure, so as to more conveniently and quickly carry out fatigue experimental research on the blade tenon structure under simulated working conditions, and more accurately simulate the radial force and tangential force it is subjected to.

[0007] The technical solution of the present invention is:

[0008] To achieve the above-mentioned invention purpose, the present invention provides an environmental fatigue performance test device for the mortise joint structure of an engine turbine blade, comprising a mortise joint structure fixing unit, an environmental control unit, a radial loading unit and a tangential loading unit; the mortise joint structure fixing unit is used to fix the mortise joint structure specimen; the environmental control unit is used to control the test environment of the mortise joint structure specimen; the radial loading unit is movably connected to the end of the mortise joint structure specimen, and is used to apply radial force to the mortise joint structure specimen; the radial loading unit can move in the horizontal direction. The tangential loading unit applies tangential force to the mortise joint structure specimen through an arc-shaped push rod.

[0009] An environmental fatigue performance testing device for a mortise joint structure of an engine turbine blade comprises a mortise joint structure fixing unit 10, an environmental control unit 20, a radial loading unit 30 and a tangential loading unit 40; the mortise joint structure comprises a blade root tenon tooth simulation part 12 and a tenon groove simulation part 11; the mortise joint structure fixing unit 10 is used to fix the tenon groove simulation part 11; the mortise joint structure is located in a test environment, and the environmental control unit 20 is used to provide a test environment; the radial loading unit 30 and the tangential loading unit 40 are both movably connected to the blade root tenon tooth simulation part, and are used to apply centrifugal force and tangential force to the blade root tenon tooth simulation part respectively;

[0010] The radial loading unit 30 can be horizontally reciprocated, and the loading end of the radial loading unit can be radially retracted;

[0011] The loading end of the tangential loading unit can be reciprocated along an arc;

[0012] The environmental control unit 20 is used to control environmental parameters in the test environment.

[0013] As a further improvement of the present invention, the blade root tenon simulation part is connected to the radial loading unit and / or the tangential loading unit in an articulated manner.

[0014] As a further improvement of the present invention, the tangential loading unit includes left and right arc-shaped push rods and an actuator. The left and right arc-shaped push rods can move back and forth along an arc path. The blade root tenon simulation piece is located between the left and right arc-shaped push rods and is supported by the left and right arc-shaped push rods. The left and right arc-shaped push rods move back and forth along the arc path under the push of the horizontal actuator. The arc-shaped push rod moves along the arc path, ensuring that the force direction of the push rod on the blade root tenon simulation piece is always in the tangential direction, and the force is controllable, so that a constant force can be applied during the test. Furthermore, the actuator includes left and right actuators, which correspond to the left and right arc-shaped push rods, respectively. The arc-shaped push rod can ensure that the applied actuating force acts completely on the blade root. This allows at least the tangential force loading method to be simplified when implementing force loading, thereby improving the accuracy of the test.

[0015] As a further improvement of the present invention, the radial loading unit includes a radial actuator and a radial force rod, one end of the radial force rod is movably connected to the tenon simulation part, and the other end of the radial force rod is connected to the loading end of the radial actuator; the radial actuator is slidably arranged on a horizontal slide rail.

[0016] As a further improvement of the present invention, the radial telescopic rod of the radial actuator is connected to a radial force sensor for detecting radial force data.

[0017] As a further improvement of the present invention, the left and right arc-shaped push rods are slidably arranged on circular arc tracks.

[0018] As a further improvement of the present invention, the ends of the left and right arc-shaped push rods are provided with balls for transmitting the actuating force.

[0019] As a further improvement of the present invention, each of the left and right arc-shaped push rods is restricted by a plurality of rollers or bearings to ensure that the left tangential arc-shaped push rod always moves in the tangential direction.

[0020] As a further improvement of the present invention, the left and right arc-shaped top rods are respectively provided with telescopic rod actuators, and are both provided with tangential force sensors for detecting tangential force data.

[0021] As a further improvement of the present invention, the tangential loading unit 40 is a symmetrical structure.

[0022] As a further improvement of the present invention, the environmental control unit is used to control the temperature and atmosphere of the test environment.

[0023] As a further improvement of the present invention, the environmental fatigue performance testing device for the engine blade tenon joint structure also includes a data acquisition system for collecting mechanical data of the radial loading unit and the tangential loading unit and image data of the tenon joint structure specimen.

[0024] To achieve the above-mentioned purpose, the present invention also provides a method for testing the environmental fatigue performance of an engine blade tenon joint structure, wherein the fatigue performance test is performed using any of the above-mentioned devices, and the method comprises the following steps:

[0025] S1. The mortise and tenon structure specimen is fixed by the mortise and tenon structure fixing unit, and is connected to the radial loading unit and the tangential loading unit respectively;

[0026] S2. Turn on the environmental control unit and adjust the test environment of the mortise and tenon structure specimen to a preset environment;

[0027] S3. Applying radial force and tangential force to the mortise and tenon structure specimen through the radial loading unit and the tangential loading unit respectively;

[0028] S4. Collect the mechanical data of the radial loading unit and the tangential loading unit and the test data of the mortise and tenon structure (including mechanical data and image data, etc.). Preferably, the data collection is performed through a data collection system.

[0029] The advantages of the present invention are:

[0030] 1. The environmental fatigue performance testing device for the tenon joint structure of an engine blade provided by the present invention comprises a tenon joint structure fixing unit, an environmental control unit, a radial loading unit, a tangential loading unit and a data acquisition system. A radial load is applied to the blade tenon simulation part by a radial actuator to simulate the centrifugal load borne by the blade tenon structure under real working conditions; a bending load is applied to the end of the blade tenon simulation part by a tangential actuator to simulate the aerodynamic load and high-frequency low-amplitude vibration load borne by the blade tenon structure under real working conditions; an environmental chamber is used to simulate the environmental temperature and atmosphere of the blade tenon structure under real working conditions; during the experiment, an image acquisition system is used to capture and measure the image of the tenon and mortise contact area, and the waveforms of the radial force and the tangential force are collected. Compared with the real working conditions of the blade, the experimental conditions of the present invention are controllable, the collected data are complete, and the difficulties such as high cost of actual engine experiments and difficulty in carrying out accurate parameter measurements are avoided, and fatigue experimental research on the blade tenon structure under simulated working conditions can be carried out more conveniently and quickly. A new simulation experimental device and method are provided for studying the fatigue damage mechanism of blades.

[0031] 2. The environmental fatigue performance test device for the engine blade tenon joint structure provided by the present invention has a tenon tooth simulation part connected to the radial loading unit by a hinged support, which is convenient for installation and disassembly on the one hand, and ensures the parameter simulation of the actual blade working condition on the other hand, with higher authenticity and reliability, and higher fatigue performance test value. The radial loading unit of the present invention can move in the horizontal direction, so that when the tenon joint structure specimen is bent by the tangential force, the radial loading unit moves the corresponding bending displacement accordingly, so as to ensure that the radial loading unit always applies radial force to the tenon joint structure specimen, so as to more realistically simulate the centrifugal load borne by the blade tenon joint structure under the actual working conditions.

[0032] 3. The environmental fatigue performance testing device for the engine blade tenon joint structure provided by the present invention, the tenon simulation part is connected to the tangential loading unit by means of a double push rod. The present invention uses an arc-shaped push rod to enable the tangential loading unit to apply a tangential force that is always perpendicular to the radial direction, and the radius of the arc-shaped push rod can be designed according to the actual working conditions to simulate turbine disks of different sizes. The loading method of the tangential force is simplified, the problem of inaccurate force application caused by the arc is overcome, and the accuracy of the test is improved. The purpose of the arc-shaped push rod designed by the present invention is that when the tenon joint structure specimen is bent by the tangential force, the tangential loading unit always applies a tangential force to the tenon joint structure specimen, so as to more realistically simulate the aerodynamic load and vibration load borne by the blade tenon joint structure under actual working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the environmental fatigue performance testing device for engine blade tenon joint structure of the present invention;

[0034] Figure 2 It is a partial schematic diagram of the loading structure of the environmental fatigue performance testing device for the engine blade tenon joint structure of the present invention;

[0035] Figure 3 It is a schematic diagram of the arc-shaped push rod structure of the environmental fatigue performance testing device for the engine blade tenon joint structure of the present invention;

[0036] Figure 4 It is a force diagram of the tenon joint mechanism of the environmental fatigue performance testing device for the tenon joint structure of an engine blade according to the present invention;

[0037] Figure 5 It is a schematic diagram of the tangential force transmitted by the arc-shaped push rod of the environmental fatigue performance testing device for the engine blade tenon joint structure of the present invention;

[0038] Among them: 10-mortise and tenon structure fixing unit; 11-mortise and tenon simulation part; 12-mortise and tenon simulation part; 20-environmental control unit; 30-radial loading unit; 31-radial actuator slide rail; 32-radial actuator fixing part; 33-radial actuator; 34-radial force sensor; 35-radial telescopic rod; 36-radial force rod; 40-tangential loading unit; 41-left tangential loading structure; 42-right tangential loading structure; 43-left tangential arc ejector rod; 44-right tangential arc push rod; 45-left limit ball screw; 46-right limit ball screw; 50-data acquisition system; 51-camera; 411-left tangential actuator cylinder; 412-left tangential force sensor; 413-left tangential telescopic rod; 421-right tangential actuator cylinder; 422-right tangential force sensor; 423-right tangential telescopic rod; 431-left end ball of left tangential arc push rod; 432-left tangential arc push rod; 433-right end ball of left tangential arc push rod; 451-left ball screw one; 452-left ball screw two; 453-left ball screw three. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below in conjunction with specific embodiments.

[0040] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the specific embodiments, while other details that are not closely related to the present invention are omitted.

[0041] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0042] See also Figure 1 As shown, a device for testing the environmental fatigue performance of the tenon joint structure of an engine blade is provided, comprising a tenon joint structure fixing unit, an environmental control unit, a radial loading unit and a tangential loading unit; the tenon joint structure fixing unit is used to fix the tenon joint structure specimen; the environmental control unit is used to control the test environment of the tenon joint structure specimen; the radial loading unit is movably connected to the end of the tenon joint structure specimen, and is used to apply radial force to the tenon joint structure specimen; the radial loading unit can move in the horizontal direction. The tangential loading unit applies tangential force to the tenon joint structure specimen through an arc-shaped ejector rod.

[0043] The embodiment is an environmental fatigue performance test device for a mortise joint structure of an engine turbine blade, comprising a mortise joint structure fixing unit 10, an environmental control unit 20, a radial loading unit 30 and a tangential loading unit 40; the mortise joint structure comprises a blade root tenon tooth simulation part 12 and a tenon groove simulation part 11; the mortise joint structure fixing unit 10 is used to fix the tenon groove simulation part 11; the mortise joint structure is located in a test environment, and the environmental control unit 20 is used to provide a test environment; the radial loading unit 30 and the tangential loading unit 40 are both movably connected to the blade root tenon tooth simulation part, and are used to apply centrifugal force and tangential force to the blade root tenon tooth simulation part respectively;

[0044] The radial loading unit 30 can be horizontally reciprocated, and the loading end of the radial loading unit can be radially retracted;

[0045] The loading end of the tangential loading unit can be reciprocated along an arc;

[0046] The environmental control unit 20 is used to control environmental parameters in the test environment.

[0047] As a further improvement of the present invention, the blade root tenon simulation part is connected to the radial loading unit and / or the tangential loading unit in an articulated manner.

[0048] As a further improvement of the present invention, the tangential loading unit includes left and right arc-shaped push rods and an actuator. The left and right arc-shaped push rods can move back and forth along an arc path. The blade root tenon simulation piece is located between the left and right arc-shaped push rods and is supported by the left and right arc-shaped push rods. The left and right arc-shaped push rods move back and forth along the arc path under the push of the horizontal actuator. The arc-shaped push rod moves along the arc path, ensuring that the force direction of the push rod on the blade root tenon simulation piece is always in the tangential direction, and the force is controllable, so that a constant force can be applied during the test. Furthermore, the actuator includes left and right actuators, which correspond to the left and right arc-shaped push rods, respectively.

[0049] As a further improvement of the present invention, the radial loading unit includes a radial force rod, one end of which is movably connected to the tenon simulation component, and the other end of which is connected to a radial actuator; the radial actuator is slidably arranged on a horizontal slide rail.

[0050] The radial telescopic rod of the radial actuator is connected with a radial force sensor for detecting radial force data.

[0051] The ends of the left and right arc-shaped push rods are provided with balls for transmitting the working force.

[0052] The left and right arc-shaped push rods, each of which is restricted by a plurality of rollers or bearings, ensure that the left tangential arc-shaped push rod always moves along the tangential direction.

[0053] The left and right arc-shaped top rods are respectively provided with telescopic rod actuators, and are both provided with tangential force sensors for detecting tangential force data.

[0054] The tangential loading unit 40 is a symmetrical structure.

[0055] The environmental control unit is used to control the temperature and atmosphere of the test environment.

[0056] The environmental fatigue performance testing device for the engine blade tenon joint structure also includes a data acquisition system for acquiring mechanical data of the radial loading unit and the tangential loading unit and image data of the tenon joint structure specimen.

[0057] Another embodiment provided by the present invention is shown in Figure 1-4 As shown, a device for testing environmental fatigue performance of engine blade tenon joint structure includes a tenon joint structure fixing unit 10, an environmental control unit 20, a radial loading unit 30 and a tangential loading unit 40. The tenon joint structure fixing unit 10 is used to fix the tenon joint structure specimen, and in actual use, it can be a foundation fixing structure. In some embodiments, the tenon joint structure specimen includes a tenon groove simulation part 11 and a tenon tooth simulation part 12, one end of the tenon groove simulation part 11 is fixed by the tenon joint structure fixing unit, and the other end is connected to the tenon tooth simulation part 12, and the other end of the tenon tooth simulation part 12 is respectively connected to the radial loading unit 30 and the tangential loading unit 40. For example: the tenon groove simulation part 11 is fixed to the foundation, the tenon tooth simulation part 12 is inserted into the tenon groove simulation part 11, and the other end of the tenon tooth simulation part 12 is connected to the radial loading unit 30 with a pin, so as to apply radial force to the tenon joint structure specimen, and the tangential loading unit 40 applies tangential force to the tenon joint structure specimen through an arc-shaped push rod. In particular, the tenon simulation part 12 is connected to the radial loading unit 30 by means of a hinge, and is connected to the tangential loading unit 40 by means of an arc-shaped push rod, which is convenient for installation and disassembly on the one hand, and ensures full-parameter simulation of actual blade working conditions on the other hand, with higher authenticity and reliability, and higher fatigue performance test value.

[0058] The environmental control unit 20 is used to control the test environment of the mortise and tenon structure specimen. For example, by placing the mortise and tenon structure fixing unit 10 and the tenon tooth simulation component 12 in the environmental box of the environmental control unit 20, the temperature and atmosphere during the fatigue test are controlled to ensure full parameter simulation of the actual blade working condition.

[0059] In particular, the radial loading unit 30 can move along the tangential direction of the mortise and tenon structure specimen. The purpose is that when the mortise and tenon structure specimen is bent by the tangential force, the radial loading unit 30 moves accordingly with the corresponding bending displacement to ensure that the radial loading unit 30 always applies radial force to the mortise and tenon structure specimen.

[0060] Specifically, the radial loading unit 30 includes a radial force rod 36 connected to the tenon simulation part 12 by a hinged support, and a radial actuator cylinder 33 connected to the other end of the radial force rod 36 by a hinged support. The radial actuator cylinder 33 (corresponding to the actuator, the telescopic end of the actuator cylinder is the loading end) is fixed on the radial actuator cylinder slide rail 31, which is used to move the radial loading unit 30 along the tangential direction of the tenon structure specimen. The radial actuator cylinder slide rail 31 is installed on the radial actuator cylinder fixing part 35, which can ensure that the radial actuator cylinder 34 can move in the tangential direction, while the radial direction is constrained to simulate the centrifugal load borne by the blade tenon structure under real working conditions. The radial actuator cylinder fixing part 35 can also be a foundation fixed structure for easy installation and use.

[0061] In particular, the radial force applying rod 36 is connected to a radial force sensor 34 for detecting radial force data, such as the magnitude and waveform of the radial force.

[0062] The tangential loading unit 40 is connected to the tenon simulation part 12 by means of an arc-shaped push rod, and a ball is provided at the end of the arc-shaped push rod.

[0063] In particular, the environmental fatigue performance testing device for the engine blade mortise structure also includes a data acquisition system 50, which is connected to the radial force sensor 34, the radial actuator cylinder 34, the tangential force sensor 42, the tangential actuator cylinder 43 and the camera 51. The data acquisition system 50 issues images, data acquisition and control commands for collecting the mechanical data of the radial loading unit 30 and the tangential loading unit 40 and the image data of the mortise structure specimen.

[0064] The camera 51 is used to observe the contact surface position of the tenon simulation part 12 and the tenon groove simulation part 11. The device for controlling the experimental environment such as the ambient temperature and atmosphere will not block the optical observation of the contact position of the tenon groove simulation part 11 and the tenon simulation part 12.

[0065] The present invention also provides a method for environmental fatigue performance testing of an engine blade tenon joint structure, which uses the device described in the above technical solution to perform fatigue performance testing, including the following steps:

[0066] S1. The mortise and tenon structure specimen is fixed by the mortise and tenon structure fixing unit 10, and is connected to the radial loading unit 30 and the tangential loading unit 40 respectively;

[0067] Specifically, the tenon groove simulation member 11 is fixed to the foundation, the tenon tooth simulation member 12 is inserted into the tenon groove, and the front end of the tenon tooth simulation member 12 is connected to the radial force rod 36 and the tangential connecting rod 41 by a pin;

[0068] S2. Turn on the environmental control unit 20 and adjust the test environment of the tenon joint structure specimen to a preset environment to simulate the ambient temperature of the engine blade tenon groove position;

[0069] S3. Applying radial force and tangential force to the mortise and tenon structure specimen through the radial loading unit 30 and the tangential loading unit 40 respectively;

[0070] Specifically, according to the size and waveform of the centrifugal force of the simulated blade under the actual working conditions, the radial actuator cylinder 34 is controlled to apply radial force to the tenon simulation part 12; the size of the pulling force is measured by the radial force sensor 34 and the movement of the radial actuator cylinder 34 is feedback-controlled to simulate the centrifugal force of the engine blade under the working state; in this process, the radial actuator cylinder slide rail 31 is slid to ensure that the tenon simulation part 12 is always subjected to radial force.

[0071] According to the simulated aerodynamic force and vibration waveform of the blade under the actual working condition, the tangential actuators 41 and 42 are controlled to apply tangential force to the tenon simulation part 12 to ensure that the bending moment is equivalent to the actual working condition; the waveform of the tangential force is measured by the tangential force sensors 412 and 422 and feedback is used to control the movement of the tangential actuators 41 and 42. The movements of the tangential actuators 41 and 42 are in opposite phases. The waveform of the tangential force can be a sine wave or a triangular wave. The bending moment corresponding to the mean value of the force is used to simulate the aerodynamic bending moment of the engine blade under the working condition, and the bending moment corresponding to the amplitude of the force is used to simulate the high-frequency vibration bending moment of the engine blade under the working condition.

[0072] In particular, according to the arc angle θ corresponding to the arc-shaped push rod, the force value F0 of the tangential force sensor and the tangential force F1 actually acting on the tenon simulation part have the following relationship:

[0073] F1=F0*cosθ

[0074] In particular, when the arc-shaped top rod is short enough, or the radius of curvature of the arc-shaped top rod is large enough, the arc-shaped top rod is similar to the horizontal rod, and the corresponding arc angle approaches zero. At this time, cosθ is approximately 1, and then:

[0075] F1=F0

[0076] It can be seen from this that the applied load of the actuator can be completely transferred to the blade root, which facilitates constant load application and simplifies the control method.

[0077] S4. The data acquisition system 50 is used to collect the mechanical data of the radial loading unit 30 and the tangential loading unit 40 and the image data of the mortise and tenon structure specimen until the experiment is finished.

[0078] Specifically, the camera 51 is started to observe the contact surface position of the tenon simulation part 12 and the tenon groove simulation part 11; and the temperature, radial force sensor 34 and tangential force sensor 412, 422 signals are recorded during the experiment to obtain characteristic information such as radial force, tangential force waveform and loading cycles until the end of the experiment.

[0079] In summary, the environmental fatigue performance testing device for the engine blade tenon structure provided by the present invention applies radial load to the blade tenon simulation part through the radial actuator to simulate the centrifugal load borne by the blade tenon structure under real working conditions; applies bending load to the end of the blade tenon simulation part through the tangential actuator to simulate the aerodynamic load and high-frequency low-amplitude vibration load borne by the blade tenon structure under real working conditions; simulates the environmental temperature and atmosphere of the blade tenon structure under real working conditions through the environmental chamber; during the experiment, the image acquisition system is used to capture and measure the image of the tenon and mortise contact area, and collects the waveforms of the radial force and the tangential force. The present invention avoids the difficulties of high cost of actual engine experiments and difficulty in carrying out accurate parameter measurements, and can more conveniently and quickly carry out fatigue experimental research on the blade tenon structure under simulated working conditions, providing a new simulation experimental device and method for studying the fatigue damage mechanism of blades.

[0080] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. Environmental fatigue performance test device for engine turbine blade tenon joint structure, characterized by: The invention comprises a tenon joint structure fixing unit (10), an environment control unit (20), a radial loading unit (30) and a tangential loading unit (40); the tenon joint structure comprises a blade root tenon tooth simulation part (12) and a tenon groove simulation part (11); the tenon joint structure fixing unit (10) is used to fix the tenon groove simulation part (11); the tenon joint structure is located in a test environment, and the environment control unit (20) is used to control the test environment; the radial loading unit (30) and the tangential loading unit (40) are both movably connected to the blade root tenon tooth simulation part, and are used to apply centrifugal force and tangential force to the blade root tenon tooth simulation part respectively; The radial loading unit (30) can be reciprocated horizontally, and the loading end of the radial loading unit can be radially telescopic; The loading end of the tangential loading unit can be reciprocated along an arc; The environmental control unit (20) is used to control environmental parameters in the test environment; The tangential loading unit includes left and right arc-shaped push rods and an actuator. The left and right arc-shaped push rods can move back and forth along an arc path. The blade root tenon simulation component is located between the left and right arc-shaped push rods and is supported by the left and right arc-shaped push rods. The left and right arc-shaped push rods move back and forth along the arc path under the push of the horizontal actuator.

2. The environmental fatigue performance testing device for engine turbine blade tenon joint structure according to claim 1 is characterized in that: The blade root tenon simulation piece is connected to the radial loading unit and / or the tangential loading unit in an articulated manner.

3. The environmental fatigue performance testing device for engine turbine blade tenon joint structure according to claim 1, characterized in that: The actuator comprises a left actuator and a right actuator, which correspond to the left and right arc-shaped ejector rods respectively.

4. The environmental fatigue performance testing device for engine turbine blade tenon joint structure according to claim 1, characterized in that: The radial loading unit includes a radial actuator and a radial force rod, one end of the radial force rod is movably connected to the tenon simulation component, and the other end of the radial force rod is connected to the loading end of the radial actuator; the radial actuator is slidably arranged on a horizontal slide rail.

5. The environmental fatigue performance testing device for engine turbine blade tenon joint structure according to claim 1 or 4, characterized in that: The radial telescopic rod of the radial actuator is connected with a radial force sensor for detecting radial force data.

6. The environmental fatigue performance testing device for engine turbine blade tenon joint structure according to claim 1, characterized in that: The left and right arc-shaped push rods are slidably arranged on the circular arc track.

7. The environmental fatigue performance testing device for engine turbine blade tenon joint structure according to claim 1, characterized in that: The ends of the left and right arc-shaped push rods are provided with balls.

8. The environmental fatigue performance testing device for engine turbine blade tenon joint structure according to claim 1, characterized in that: The left and right arc-shaped push rods, each of which is restricted by a plurality of rollers or bearings, ensure that the left tangential arc-shaped push rod always moves along the tangential direction.

9. The environmental fatigue performance testing device for engine turbine blade tenon joint structure according to claim 1, characterized in that: The left and right arc-shaped top rods are respectively provided with telescopic rod actuators, and are both provided with tangential force sensors.

10. The environmental fatigue performance testing device for engine turbine blade tenon joint structure according to claim 1, characterized in that: The tangential loading unit (40) is a symmetrical structure.

11. The environmental fatigue performance testing device for engine turbine blade tenon joint structure according to claim 1, characterized in that: The environmental control unit is used to control the temperature and air pressure of the test environment.

12. The environmental fatigue performance testing device for engine turbine blade tenon joint structure according to claim 1, characterized in that: The environmental fatigue performance testing device for the engine turbine blade tenon joint structure also includes a data acquisition system for acquiring mechanical data of the radial loading unit and the tangential loading unit and image data of the tenon joint structure specimen.

13. The environmental fatigue performance testing device for engine turbine blade tenon joint structure according to claim 1, characterized in that: The environmental control unit (20) is used to apply temperature and / or air pressure in the test environment.

14. The environmental fatigue performance test method of the engine turbine blade tenon joint structure is characterized by: The environmental fatigue performance testing device for the engine turbine blade tenon joint structure according to any one of claims 1 to 13 comprises the following steps: S1. The mortise and tenon structure specimen is fixed by the mortise and tenon structure fixing unit (10), and connected to the radial loading unit (30) and the tangential loading unit (40); S2. Turning on the environmental control unit (20) to adjust the test environment of the mortise and tenon structure specimen to a preset environment; S3. applying centrifugal force and tangential force to the mortise and tenon structure specimen respectively through the radial loading unit (30) and the tangential loading unit (40); S4. The mechanical data of the radial loading unit (30) and the tangential loading unit (40) and the image data of the mortise and tenon structure specimen are collected through a data collection system (50) until the experiment is completed.

Images