CN114136595A - Engine turbine blade joggle structure environment fatigue performance testing device and method thereof - Google Patents
Engine turbine blade joggle structure environment fatigue performance testing device and method thereof Download PDFInfo
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Abstract
The invention provides an environmental fatigue performance testing device and method for a turbine blade joggle joint structure of an engine. The device comprises a tenon joint structure fixing unit, an environment control unit, a radial loading unit and a tangential loading unit; the joggling structure comprises a blade root tenon tooth simulation piece and a mortise simulation piece; the tenon joint structure fixing unit is used for fixing the mortise simulation piece; the joggle structure is positioned in a test environment, and the environment control unit is used for controlling the test environment; the radial loading unit and the tangential loading unit are movably connected with the blade root tenon tooth simulation piece and are respectively used for applying centrifugal force and tangential force to the blade root tenon tooth simulation piece. The tangential loading unit comprises two arc-shaped ejector rods, and the force applied by the tangential loading unit in the experimental process is ensured to be always along the tangential direction. The invention can simulate the fatigue damage process of the engine blade joggle joint structure under the real working condition in a laboratory, and provides a new simulation experiment device and method for researching the fatigue damage mechanism of the blade.
Description
Technical Field
The invention relates to the field of material fatigue performance testing, in particular to an environmental fatigue performance testing device and method for a turbine blade joggle joint structure of an engine.
Background
Aeroengine or gas turbine technology all involve the blade structure, include: compressor blades and turbine blades. These blades are usually mounted to a compressor or turbine disk, which is attached to the main shaft of the engine, by a dovetail structure, and are important components of the engine. The reliability and safe life of these blades plays a critical role in the reliability and life of the engine as a whole.
Due to the characteristics of high working temperature, large service load, micro-amplitude vibration and the like of the blades, the fatigue performance of the blades needs to be considered particularly during design. Especially in the areas where the blade teeth and the mortise contact, fretting fatigue damage at high temperatures often occurs. Therefore, the environmental fatigue test for the tenon tooth structure of the blade is very necessary. However, due to the characteristics of complex structure, high working temperature, high spindle rotation speed and the like of the engine, the problems of difficult sensor installation, huge cost and the like exist when the related fatigue test is carried out on the engine, so that the method cannot be carried out. The prior art also lacks a method and a device for carrying out simulation fatigue test on the blade tenon tooth structure.
Considering the actual working condition of the blade, in use, the loads are mainly pneumatic loads along the rotation tangential direction and centrifugal loads along the diameter direction of the wheel disc, namely the forces borne by the tenon tooth structure are tangential forces and radial forces. In the prior art (such as 202011637346.4), the loading structure in the vertical direction is fixed, so that an included angle exists between the simulated radial force and the radial direction, the condition that the radial direction is always radial cannot be proved, and the tangential force loading is replaced by horizontal force loading in the prior art, which is not consistent with the actual working condition.
In view of the above, there is a need for an improved apparatus and method for testing environmental fatigue performance of a dovetail structure of an engine blade to solve the above problems.
Disclosure of Invention
The purpose of the invention is: in order to overcome the defects of the prior art, the invention aims to provide the device and the method for testing the environmental fatigue performance of the engine blade tenon joint structure, so that the fatigue experiment research of the blade tenon tooth structure under the condition of simulating the working condition can be more conveniently and rapidly carried out, and the radial force and the tangential force borne by the blade tenon tooth structure can be more accurately simulated.
The technical scheme of the invention is as follows:
in order to achieve the aim, the invention provides an environmental fatigue performance testing device for a mortise joint structure of an engine turbine blade, which comprises a mortise joint structure fixing unit, an environmental control unit, a radial loading unit and a tangential loading unit, wherein the mortise joint structure fixing unit is fixedly connected with the environmental control unit; the tenon joint structure fixing unit is used for fixing a tenon joint structure test piece; the environment control unit is used for controlling the test environment of the joggle structure test piece; the radial loading unit is movably connected with the end part of the mortise structure test piece and is used for applying radial force to the mortise structure test piece; the radial loading unit is movable in a horizontal direction. And the tangential loading unit applies tangential force to the joggle joint structure test piece through the arc-shaped ejector rod.
The environmental fatigue performance testing device for the engine turbine blade joggle structure comprises a joggle structure fixing unit 10, an environmental 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 piece 12 and a mortise simulation piece 11; the tenon joint structure fixing unit 10 is used for fixing the mortise simulation piece 11; the joggle structure is positioned in a test environment, and the environment control unit 20 is used for providing the test environment; the radial loading unit 30 and the tangential loading unit 40 are movably connected with the blade root tenon tooth simulation piece and are respectively used for applying centrifugal force and tangential force to the blade root tenon tooth simulation piece;
the radial loading unit 30 can be displaced in a horizontal reciprocating manner, and the loading end of the radial loading unit can be extended and contracted in a radial direction;
the loading end of the tangential loading unit can reciprocate along an arc;
the environment control unit 20 is used to control environmental parameters in the test environment.
As a further development of the invention, the root tenon tooth simulation element is connected in an articulated manner to the radial loading unit and/or the tangential loading unit.
As a further improvement of the invention, the tangential loading unit comprises a left arc ejector rod, a right arc ejector rod and an actuator, the left arc ejector rod and the right arc ejector rod can reciprocate and displace along an arc path, the blade root tenon tooth simulation piece is positioned between the left arc ejector rod and the right arc ejector rod and is abutted by the left arc ejector rod and the right arc ejector rod, and the left arc ejector rod and the right arc ejector rod reciprocate along the arc path under the pushing of the horizontal actuator. The arc ejector pin removes along pitch arc route, has guaranteed that the application of force direction of ejector pin on blade root tenon tooth simulation piece is tangential direction all the time, and the application of force is controllable, can apply constant force in the experimentation. Furthermore, the actuator comprises a left actuator and a right actuator which respectively correspond to the left arc-shaped ejector rod and the right arc-shaped ejector rod. The arc-shaped ejector rod can ensure that the applied actuating force completely acts on the blade root. Therefore, the tangential force loading mode can be at least simplified when the force loading is implemented, and the test accuracy is improved.
As a further improvement of the invention, the radial loading unit comprises a radial actuator and a radial force application rod, one end of the radial force application rod is movably connected with the tenon tooth simulation piece, and the other end of the radial force application rod is connected with a loading end of the radial actuator; the radial actuator is arranged on the horizontal sliding rail in a sliding mode.
As a further improvement of the invention, a radial force sensor is connected to the radial telescopic rod of the radial actuator and is used for detecting radial force data.
As a further improvement of the invention, the left and right arc-shaped mandrils are arranged on the arc-shaped track in a sliding way.
As a further improvement of the invention, the end parts of the left and right arc-shaped mandrils are provided with balls. For transmitting the actuation force.
As a further improvement of the invention, each of the left and right arc-shaped push rods is limited by a plurality of rollers or bearings, so that the left tangential arc-shaped push rod is ensured to move along the tangential direction all the time.
As a further improvement of the invention, the left arc-shaped ejector rod and the right arc-shaped ejector rod are respectively corresponding to telescopic rod actuators and are provided with tangential force sensors. For detecting tangential force data.
As a further improvement of the present invention, the tangential loading unit 40 is a symmetrical mechanism.
As a further improvement of the present invention, the environment control unit is used for controlling the temperature and atmosphere of the test environment.
As a further improvement of the invention, the environmental fatigue performance testing device for the engine blade tenon joint structure further comprises a data acquisition system, and the data acquisition system is used for acquiring the mechanical data of the radial loading unit and the tangential loading unit and the image data of the tenon joint structure test piece.
In order to achieve the aim, the invention also provides a method for testing the environmental fatigue performance of the engine blade joggle joint structure, which adopts the device for testing the fatigue performance and comprises the following steps:
s1, fixing a joggle structure test piece through the joggle structure fixing unit, and respectively connecting the joggle structure test piece with the radial loading unit and the tangential loading unit;
s2, starting the environment control unit, and adjusting the test environment of the joggle structure test piece to a preset environment;
s3, respectively applying a radial force and a tangential force to the joggle joint structure test piece through the radial loading unit and the tangential loading unit;
and S4, collecting mechanical data of the radial loading unit and the tangential loading unit and test data (including mechanical data, image data and the like) of the joggle joint structure. Preferably, the acquisition is performed by a data acquisition system.
The invention has the advantages that:
1. the invention provides an environmental fatigue performance testing device for a mortise joint structure of an engine blade. Applying a radial load to the blade tenon tooth simulation piece through a radial actuating cylinder so as to simulate a centrifugal load borne by a blade tenon tooth structure under a real working condition; bending load is applied to the end part of the blade tenon tooth simulation part through the tangential actuating cylinder so as to simulate pneumatic load and high-frequency low-amplitude vibration load borne by the blade tenon tooth structure under the real working condition; simulating the environmental temperature and atmosphere of the blade tenon tooth structure under the real working condition by using an environmental box; in the experimental process, an image acquisition system is used for carrying out image acquisition and measurement on the tenon tooth and mortise contact area, and acquiring the waveforms of radial force and tangential force. Compared with the actual working conditions of the blade, the experimental conditions are controllable, the acquired data are complete, the difficulties that the actual engine experiment cost is high, accurate parameter measurement is difficult to carry out and the like are avoided, and the fatigue experiment research of the blade tenon tooth structure under the simulated working condition can be carried out more conveniently and rapidly. Provides a new simulation experiment device and method for researching the fatigue damage mechanism of the blade.
2. According to the environment fatigue performance testing device for the engine blade tenon joint structure, the tenon tooth simulation piece is connected with the radial loading unit in a hinged manner, so that the installation and the disassembly are convenient, the parameter simulation of the actual blade working condition is ensured, the authenticity and the reliability are higher, and the fatigue performance testing value is higher. The radial loading unit can move along the horizontal direction, and aims to move corresponding bending displacement when the tenon joint structure test piece is bent under the tangential force, so that the radial loading unit can always apply radial force to the tenon joint structure test piece, and the centrifugal load borne by the blade tenon joint structure under the real working condition can be simulated more truly.
3. According to the environment fatigue performance testing device for the engine blade tenon joint structure, the tenon tooth simulation piece is connected with the tangential loading unit in a double-ejector-rod mode. According to the invention, the tangential loading unit can apply a tangential force which is always perpendicular to the radial direction through the arc-shaped ejector rod, the radius of the arc-shaped ejector rod can be designed according to the actual working condition, and the turbine disks with different sizes can be simulated. The loading mode of the tangential force is simplified, the problem of inaccurate application force caused by circular arc actuation is solved, and the test accuracy is improved. The arc ejector rod designed by the invention aims to always apply tangential force to the mortise structure test piece when the mortise structure test piece is bent under the tangential force so as to more truly simulate the pneumatic load and the vibration load born by the blade mortise structure under the real working condition.
Drawings
FIG. 1 is a schematic structural diagram of an environmental fatigue performance testing device for a dovetail structure of an engine blade according to the present invention;
FIG. 2 is a partial schematic view of a loading structure of the environmental fatigue performance testing device for the engine blade dovetail structure of the present invention;
FIG. 3 is a schematic structural view of an arc-shaped ejector rod of the environmental fatigue performance testing device for the engine blade joggle structure of the invention;
FIG. 4 is a schematic view of the dovetail mechanism force applied to the environmental fatigue performance testing apparatus for the engine blade dovetail structure of the present invention;
FIG. 5 is a schematic diagram of the tangential force transmitted by the arc ejector rod of the device for testing the environmental fatigue performance of the engine blade joggle structure of the invention;
wherein: 10-a tenon joint structure fixing unit; 11-tongue and groove simulating member; 12-a cog simulation; 20-an environmental control unit; 30-a radial loading unit; 31-radial actuator cylinder slide; 32-radial cylinder securing members; 33-radial actuating cylinder; 34-a radial force sensor; 35-a radial telescopic rod; 36-a radial force application rod; 40-a tangential loading unit; 41-left tangential loading configuration; 42-right side tangential loading configuration; 43-left tangential arc ejector rod; 44-right tangential arc-shaped mandril; 45-left side limit ball screw; 46-right side limit ball screw; 50-a data acquisition system; 51-a camera; 411-left tangential actuating cylinder; 412-left tangential force sensor; 413-left tangential telescoping rod; 421-right tangential actuating cylinder; 422-right tangential force sensor; 423-right tangential telescopic rod; 431-left tangential arc ejector rod left end ball; 432-left tangential arc ejector pin; 433-rolling balls at the right end of the left tangential arc-shaped mandril; 451-ball screw left one; 452-ball screw left two; 453-ball screw left three.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme of the present invention are shown in the specific embodiments, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1, an environmental fatigue performance testing apparatus for a mortise structure of an engine blade is provided, which includes a mortise structure fixing unit, an environmental control unit, a radial loading unit and a tangential loading unit; the tenon joint structure fixing unit is used for fixing a tenon joint structure test piece; the environment control unit is used for controlling the test environment of the joggle structure test piece; the radial loading unit is movably connected with the end part of the mortise structure test piece and is used for applying radial force to the mortise structure test piece; the radial loading unit is movable in a horizontal direction. And the tangential loading unit applies tangential force to the joggle joint structure test piece through the arc-shaped ejector rod.
The embodiment is that the environmental fatigue performance testing device for the engine turbine blade tenon joint structure comprises 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 comprises a blade root tenon tooth simulation piece 12 and a mortise simulation piece 11; the tenon joint structure fixing unit 10 is used for fixing the mortise simulation piece 11; the joggle structure is positioned in a test environment, and the environment control unit 20 is used for providing the test environment; the radial loading unit 30 and the tangential loading unit 40 are movably connected with the blade root tenon tooth simulation piece and are respectively used for applying centrifugal force and tangential force to the blade root tenon tooth simulation piece;
the radial loading unit 30 can be displaced in a horizontal reciprocating manner, and the loading end of the radial loading unit can be extended and contracted in a radial direction;
the loading end of the tangential loading unit can reciprocate along an arc;
the environment control unit 20 is used to control environmental parameters in the test environment.
As a further development of the invention, the root tenon tooth simulation element is connected in an articulated manner to the radial loading unit and/or the tangential loading unit.
As a further improvement of the invention, the tangential loading unit comprises a left arc ejector rod, a right arc ejector rod and an actuator, the left arc ejector rod and the right arc ejector rod can reciprocate and displace along an arc path, the blade root tenon tooth simulation piece is positioned between the left arc ejector rod and the right arc ejector rod and is abutted by the left arc ejector rod and the right arc ejector rod, and the left arc ejector rod and the right arc ejector rod reciprocate along the arc path under the pushing of the horizontal actuator. The arc ejector pin removes along pitch arc route, has guaranteed that the application of force direction of ejector pin on blade root tenon tooth simulation piece is tangential direction all the time, and the application of force is controllable, can apply constant force in the experimentation. Furthermore, the actuator comprises a left actuator and a right actuator which respectively correspond to the left arc-shaped ejector rod and the right arc-shaped ejector rod.
As a further improvement of the invention, the radial loading unit comprises a radial force application rod, one end of the radial force application rod is movably connected with the tenon tooth simulation piece, and the other end of the radial force application rod is connected with the radial actuator; the radial actuator is arranged on the horizontal sliding rail in a sliding mode.
And a radial telescopic rod of the radial actuator is connected with a radial force sensor for detecting radial force data.
And the end parts of the left and right arc-shaped push rods are provided with balls. For transmitting the actuation force.
Left and right arc ejector pin, every ejector pin all is by a plurality of roller bearings or bearing restriction, guarantees left side tangential arc ejector pin removes along tangential direction all the time.
The left and right arc-shaped ejector rods are respectively provided with a telescopic rod actuator in a corresponding mode and are provided with tangential force sensors. For detecting tangential force data.
The tangential loading unit 40 is a symmetrical mechanism.
The environment control unit is used for controlling the temperature and the atmosphere of the test environment.
The device for testing the environmental fatigue performance of the engine blade tenon joint structure further comprises a data acquisition system, wherein the data acquisition system is used for acquiring the mechanical data of the radial loading unit and the tangential loading unit and the image data of the tenon joint structure test piece.
Referring to fig. 1-4, another embodiment of the present invention provides an apparatus for testing environmental fatigue performance of a dovetail structure of an engine blade, including a fixing unit 10 of the dovetail structure, an environmental control unit 20, a radial loading unit 30, and a tangential loading unit 40. The tenon structure fixing unit 10 is used for fixing a tenon structure test piece, and may be a foundation fixing structure in actual use. In some embodiments, the mortise structure test piece includes a mortise simulation piece 11 and a tenon tooth simulation piece 12, one end of the mortise simulation piece 11 is fixed by the mortise structure fixing unit, the other end of the mortise simulation piece is connected to the tenon tooth simulation piece 12, and the other end of the tenon tooth simulation piece 12 is connected to the radial loading unit 30 and the tangential loading unit 40, respectively. For example: fixing the mortise simulation piece 11 to the foundation, inserting the tenon tooth simulation piece 12 into the mortise simulation piece 11, and connecting the other end of the tenon tooth simulation piece 12 with the radial loading unit 30 by using a pin, thereby applying a radial force to the mortise structure test piece, and the tangential loading unit 40 applying a tangential force to the mortise structure test piece through an arc-shaped ejector pin. Particularly, the tenon tooth simulation part 12 is connected with the radial loading unit 30 in a hinged mode, and is connected with the tangential loading unit 40 by adopting an arc ejector rod, so that the installation and the disassembly are convenient, the full-parameter simulation of the working condition of the actual blade is ensured, the authenticity and the reliability are higher, and the fatigue performance testing value is higher.
The environment control unit 20 is used for controlling the test environment of the tenon joint structure test piece, for example, the tenon joint structure fixing unit 10 and the tenon tooth simulation piece 12 are placed in an environment box of the environment control unit 20, the temperature, the atmosphere and the like in the fatigue test process are controlled, and the full-parameter simulation of the working condition of the actual blade is ensured.
In particular, the radial loading unit 30 is movable in the tangential direction of the dovetail structure test piece, so that when the dovetail structure test piece is bent by a tangential force, the radial loading unit 30 is moved by a corresponding bending displacement to ensure that the radial loading unit 30 always applies a radial force to the dovetail structure test piece.
Specifically, the radial loading unit 30 includes a radial force application rod 36 hinge-coupled to the tenon tooth simulating member 12, and a radial cylinder 33 hinge-coupled to the other end of the radial force application rod 36. The radial actuating cylinder 33 (corresponding to the actuator, the telescopic end of the actuating cylinder is the loading end) is fixed on the radial actuating cylinder slide rail 31, and is used for enabling the radial loading unit 30 to move along the tangential direction of the joggle joint structure test piece. The radial cylinder slides 31 are mounted on the radial cylinder mounts 35, which ensure that the radial cylinders 34 are movable in the tangential direction, while the radial direction is constrained to simulate the centrifugal loads experienced by the bucket dovetail under real operating conditions. The radial actuator cylinder fixing member 35 may be a foundation fixing structure, which is convenient for installation and use.
In particular, the radial force application rod 36 is connected with a radial force sensor 34 for detecting radial force data, such as radial force magnitude and waveform.
The tangential loading unit 40 is connected with the tenon tooth simulation part 12 through an arc ejector rod. The end part of the arc-shaped ejector rod is provided with a ball.
In particular, the environmental fatigue performance testing device for the engine blade dovetail structure further comprises a data acquisition system 50, wherein the data acquisition system 50 is connected with the radial force sensor 34, the radial actuating cylinder 34, the tangential force sensor 42, the tangential actuating cylinder 43 and the camera 51, and an image, data acquisition and control command is sent by the data acquisition system 50 and is used for acquiring the mechanical data of the radial loading unit 30 and the tangential loading unit 40 and the image data of the dovetail structure test piece.
The camera 51 is used for observing the contact surface position of the tenon tooth simulation piece 12 and the tenon slot simulation piece 11, and the device for controlling the experimental environments such as the environmental temperature, the atmosphere and the like can not shield the optical observation of the contact position of the tenon slot simulation piece 11 and the tenon tooth simulation piece 12.
The invention also provides a method for testing the environmental fatigue performance of the engine blade joggle joint structure, and the device adopting the technical scheme is used for testing the fatigue performance and comprises the following steps:
s1, fixing a joggle structure test piece through the joggle structure fixing unit 10, and respectively connecting the joggle structure test piece with the radial loading unit 30 and the tangential loading unit 40;
specifically, the mortise simulation piece 11 is fixed to the foundation, the tenon tooth simulation piece 12 is inserted into the mortise, and the front end of the tenon tooth simulation piece 12 is connected with the radial force application rod 36 and the tangential connecting rod 41 by using a pin;
s2, starting the environment control unit 20, and adjusting the test environment of the tenon joint structure test piece to a preset environment so as to simulate the environment temperature of the tenon groove position of the engine blade;
s3, respectively applying a radial force and a tangential force to the mortise structure test piece through the radial loading unit 30 and the tangential loading unit 40;
specifically, according to the centrifugal force and the wave shape of the simulated blade under the real working condition, the radial actuating cylinder 34 is controlled to apply radial force to the tenon tooth simulation part 12; the magnitude of the pulling force is measured by the radial force sensor 34 and the movement of the radial actuating cylinder 34 is controlled in a feedback mode so as to simulate the centrifugal force of the engine blade in the working state; in the process, the tenon tooth simulation part 12 is ensured to be always stressed in the radial direction through the sliding of the radial actuating cylinder slide rail 31.
According to the aerodynamic force and the vibration waveform of the simulated blade under the real working condition, the tangential actuating cylinders 41 and 42 are controlled to apply tangential force to the tenon tooth simulation part 12, so that the bending moment equivalent to the real working condition is ensured; the wave form of the tangential force is measured by the tangential force sensors 412, 422 and feedback controls the movement of the tangential cylinders 41, 42. The movements of the tangential cylinders 41, 42 are in opposite phase to each other. The waveform of the tangential force can adopt sine waves or triangular waves, the bending moment corresponding to the mean value of the force is used for simulating the pneumatic bending moment of the engine blade in the working state, and the bending moment corresponding to the amplitude of the force is used for simulating the high-frequency vibration bending moment of the engine blade in the working state.
In particular, the force value F0 of the tangential force sensor and the tangential force F1 actually acting on the tenon tooth simulating piece have the following relationship according to the arc angle theta corresponding to the arc ejector rod:
F1＝F0*cosθ
particularly, when the arc-shaped ejector rod is short enough or the curvature radius of the arc-shaped ejector rod is large enough, the arc-shaped ejector rod is similar to the horizontal rod, the corresponding arc angle approaches to zero, and cos θ is approximate to 1, then:
F1＝F0
therefore, the applied load of the actuator can be completely transmitted to the blade root, the constant applied load is convenient, and the control method is simplified.
And S4, acquiring the mechanical data of the radial loading unit 30 and the tangential loading unit 40 and the image data of the joggle structure test piece through the data acquisition system 50 until the experiment is finished.
Specifically, the camera 51 is started to observe the contact surface position of the tenon tooth simulation piece 12 and the mortise simulation piece 11; and recording signals of the temperature sensor 34 and the tangential force sensors 412 and 422 in the experimental process, and acquiring characteristic information of radial force, tangential force waveform, loading frequency and the like until the experiment is finished.
In conclusion, the environmental fatigue performance testing device for the engine blade tenon joint structure provided by the invention applies the radial load to the blade tenon tooth simulation piece through the radial acting cylinder so as to simulate the centrifugal load borne by the blade tenon tooth structure under the real working condition; bending load is applied to the end part of the blade tenon tooth simulation part through the tangential actuating cylinder so as to simulate pneumatic load and high-frequency low-amplitude vibration load borne by the blade tenon tooth structure under the real working condition; simulating the environmental temperature and atmosphere of the blade tenon tooth structure under the real working condition by using an environmental box; in the experimental process, an image acquisition system is used for carrying out image acquisition and measurement on the tenon tooth and mortise contact area, and acquiring the waveforms of radial force and tangential force. The invention avoids the difficulties of high experimental cost of the actual engine, difficult development of accurate parameter measurement and the like, can more conveniently and quickly develop the fatigue experimental research of the blade tenon tooth structure under the condition of simulated working conditions, and provides a new simulated experimental device and a new method for researching the fatigue damage mechanism of the blade.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (15)
1. Engine turbine blade joggle structure environment fatigue performance testing arrangement, its characterized in that: the device 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 piece 12 and a mortise simulation piece 11; the tenon joint structure fixing unit 10 is used for fixing the mortise simulation piece 11; the joggle structure is positioned in a test environment, and the environment control unit 20 is used for controlling the test environment; the radial loading unit 30 and the tangential loading unit 40 are movably connected with the blade root tenon tooth simulation piece and are respectively used for applying centrifugal force and tangential force to the blade root tenon tooth simulation piece;
the radial loading unit 30 can be displaced in a horizontal reciprocating manner, and the loading end of the radial loading unit can be extended and contracted in a radial direction;
the loading end of the tangential loading unit can reciprocate along an arc;
the environment control unit 20 is used to control environmental parameters in the test environment.
2. The environmental fatigue performance testing device for the engine turbine blade dovetail structure according to claim 1, wherein: the blade root tenon tooth simulation piece is connected with the radial loading unit and/or the tangential loading unit in a hinged mode.
3. The environmental fatigue performance testing device for the engine turbine blade dovetail structure according to claim 1, wherein: the tangential loading unit comprises a left arc ejector rod, a right arc ejector rod and an actuator, the left arc ejector rod and the right arc ejector rod can reciprocate along an arc path, the blade root tenon tooth simulation piece is located between the left arc ejector rod and the right arc ejector rod and is jacked by the left arc ejector rod and the right arc ejector rod, and the left arc ejector rod and the right arc ejector rod reciprocate along the arc path under the pushing of the horizontal actuator.
4. The environmental fatigue performance testing device for the engine turbine blade dovetail structure according to claim 1, wherein: the actuator comprises a left actuator and a right actuator which respectively correspond to the left arc-shaped ejector rod and the right arc-shaped ejector rod.
5. The environmental fatigue performance testing device for the engine turbine blade dovetail structure according to claim 1, wherein: the radial loading unit comprises a radial actuator and a radial force application rod, one end of the radial force application rod is movably connected with the tenon tooth simulation piece, and the other end of the radial force application rod is connected with a loading end of the radial actuator; the radial actuator is arranged on the horizontal sliding rail in a sliding mode.
6. The environmental fatigue performance testing device for the engine turbine blade dovetail structure according to claim 1 or 5, wherein: and a radial telescopic rod of the radial actuator is connected with a radial force sensor for detecting radial force data.
7. The environmental fatigue performance testing device for the engine turbine blade dovetail structure according to claim 1, wherein: the left and right arc-shaped ejector rods are arranged on the arc-shaped track in a sliding manner.
8. The environmental fatigue performance testing device for the engine turbine blade dovetail structure according to claim 1, wherein: and the end parts of the left and right arc-shaped push rods are provided with balls.
9. The environmental fatigue performance testing device for the engine turbine blade dovetail structure according to claim 1, wherein: left and right arc ejector pin, every ejector pin all is by a plurality of roller bearings or bearing restriction, guarantees left side tangential arc ejector pin removes along tangential direction all the time.
10. The environmental fatigue performance testing device for the engine turbine blade dovetail structure according to claim 1, wherein: the left and right arc-shaped ejector rods are respectively provided with a telescopic rod actuator in a corresponding mode and are provided with tangential force sensors.
11. The environmental fatigue performance testing device for the engine turbine blade dovetail structure according to claim 1, wherein: the tangential loading unit 40 is a symmetrical mechanism.
12. The environmental fatigue performance testing device for the engine turbine blade dovetail structure according to claim 1, wherein: the environment control unit is used for controlling the temperature and the atmosphere of the test environment.
13. The environmental fatigue performance testing device for the engine turbine blade dovetail structure according to claim 1, wherein: the device for testing the environmental fatigue performance of the engine blade tenon joint structure further comprises a data acquisition system, wherein the data acquisition system is used for acquiring the mechanical data of the radial loading unit and the tangential loading unit and the image data of the tenon joint structure test piece.
14. The environmental fatigue performance testing apparatus for a mortise joint structure of an engine turbine blade according to claim 1, wherein: the environmental control unit (20) is used to apply temperature and/or air pressure in the test environment.
15. The method for testing the environmental fatigue performance of the engine turbine blade mortise joint structure is characterized in that the device for testing the environmental fatigue performance of the engine turbine blade mortise joint structure according to any one of claims 1 to 14 is adopted, and comprises the following steps:
s1, fixing a joggle structure test piece through a joggle structure fixing unit (10), and connecting the joggle structure test piece with a radial loading unit (30) and a tangential loading unit (40);
s2, starting the environment control unit (20), and adjusting the test environment of the joggle structure test piece to a preset environment;
s3, respectively applying centrifugal force and tangential force to the joggle joint structure test piece through the radial loading unit (30) and the tangential loading unit (40);
s4, collecting the mechanical data of the radial loading unit (30) and the tangential loading unit (40) and the image data of the joggle joint structure test piece through the data collection system (50) until the experiment is finished.
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