CN113720590A - Fretting fatigue simulation test device and method - Google Patents
Fretting fatigue simulation test device and method Download PDFInfo
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- CN113720590A CN113720590A CN202110870116.0A CN202110870116A CN113720590A CN 113720590 A CN113720590 A CN 113720590A CN 202110870116 A CN202110870116 A CN 202110870116A CN 113720590 A CN113720590 A CN 113720590A
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- 238000012360 testing method Methods 0.000 title claims abstract description 116
- 238000004088 simulation Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title abstract description 9
- 238000009661 fatigue test Methods 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000010998 test method Methods 0.000 claims description 13
- 150000003839 salts Chemical class 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 238000011160 research Methods 0.000 abstract description 6
- 239000011343 solid material Substances 0.000 abstract description 3
- 239000007921 spray Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
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- 238000003825 pressing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The application belongs to the field of fatigue tests of aero-engines, and particularly relates to a fretting fatigue simulation test device and method. The method comprises the following steps: test piece, lower pressure head and last pressure head. The test piece comprises a lower assembly and an upper assembly, the lower assembly comprises a lower connecting section and a lower contact section, the lower contact section is provided with two V-shaped side wings, and the upper assembly is provided with two contact surfaces which are respectively matched with the corresponding side wings; one end of the lower pressure head is connected with a lower upright post of the fatigue testing machine, and the other end of the lower pressure head is provided with a clamping groove which is used for installing the lower connecting section; go up the one end of pressure head and be connected with fatigue testing machine's last stand, the other end with go up the subassembly butt. The fretting test of the solid material can be carried out by utilizing the conventional fatigue testing machine, the problem that the conventional fretting wear cannot be carried out in a general material mechanical property test room can be solved, and the fretting test device has great economic practicability and test research.
Description
Technical Field
The application belongs to the field of fatigue tests of aero-engines, and particularly relates to a fretting fatigue simulation test device and method.
Background
In various industrial sectors such as aviation, aerospace, nuclear and the like, the problem of fretting fatigue damage exists, and the proportion of fretting damage involved in aircraft structural failure is estimated to be as high as 90%.
The formed fretting fatigue testing machine in the prior art is applied, but the testing machine is high in price, has more requirements on the size and the shape of a test piece, can only meet the test of a material grade, is generally small in test load, single in loading mode and single in loading environment, is difficult to carry out fretting fatigue test research under a special process and an actual working condition, cannot meet the requirements in practical engineering application, and does not have mature control and acquisition capabilities similar to the fatigue testing machine. In aerospace engineering, actual components such as disc-tenon connecting structural components and the like often experience severe service conditions such as high temperature, large load and the like, so that a common fretting fatigue testing machine cannot meet the actual requirements of engineering. In addition, the fretting fatigue testing machine does not belong to conventional necessary testing equipment for a general material mechanical property laboratory, the fretting fatigue equipment purchased alone is insufficient in economic feasibility and equipment utilization rate, and the fretting fatigue testing machine is narrow in testing range, so that the technology is still incomplete, and corresponding fretting fatigue testing research cannot be carried out in the general material mechanical property laboratory.
Accordingly, a technical solution is desired to overcome or at least alleviate at least one of the above-mentioned drawbacks of the prior art.
Disclosure of Invention
The application aims to provide a fretting fatigue simulation test device and a fretting fatigue simulation test method, so as to solve at least one problem in the prior art.
The technical scheme of the application is as follows:
a first aspect of the present application provides a fretting fatigue simulation test device, comprising:
the test piece comprises a lower assembly and an upper assembly, the lower assembly comprises a lower connecting section and a lower contact section, the lower contact section is provided with two V-shaped side wings, and the upper assembly is provided with two contact surfaces which are respectively matched with the corresponding side wings;
one end of the lower pressure head is connected with a lower upright post of the fatigue testing machine, and the other end of the lower pressure head is provided with a clamping groove which is used for installing the lower connecting section;
and the upper pressure head, one end of the upper pressure head is connected with the upper stand column of the fatigue testing machine, and the other end of the upper pressure head is abutted to the upper assembly.
Optionally, the lower pressure head is connected with the lower stand column of the fatigue testing machine in a threaded fit manner, and the upper pressure head is connected with the upper stand column of the fatigue testing machine in a threaded fit manner.
Optionally, still include the salt fog case, when the fretting fatigue analogue test, the testpieces setting is in the salt fog case, the salt fog case is used for the testpieces provide the salt fog environment.
Optionally, the test device further comprises a temperature control box, wherein the test piece is arranged in the temperature control box during the fretting fatigue simulation test, and the temperature control box is used for providing a high-temperature environment for the test piece.
Optionally, the test piece testing device further comprises a gas collecting box, wherein the test piece is arranged in the gas collecting box during the fretting fatigue simulation test, and the gas collecting box is used for providing an atmosphere environment for the test piece.
Optionally, the fatigue testing machine is an EHF-100KN-20L electrohydraulic fatigue testing machine.
A second aspect of the present application provides a fretting fatigue simulation test method based on the fretting fatigue simulation test apparatus as described above, including:
step one, designing a test piece, and determining included angles A between two side wings of the lower assembly and a horizontal plane and the thickness M of the two side wings of the lower assembly;
mounting a lower pressure head on a lower upright of the fatigue testing machine, mounting an upper pressure head on an upper upright of the fatigue testing machine, mounting a lower connecting section of the lower assembly in a clamping groove of the lower pressure head, mounting two contact surfaces of the upper assembly and two side wings of the lower assembly in a matched manner, and abutting the upper pressure head against the upper assembly;
selecting a test waveform, starting a fatigue testing machine, and performing a fretting fatigue simulation test;
and fourthly, observing the wear surface of the test piece through a scanning electron microscope, representing the wear surface appearance of the test piece by using a 3D surface appearance instrument, and judging the fretting fatigue resistance of the material and the member.
Optionally, in the first step, the determining an included angle a between the two side wings of the lower assembly and the horizontal plane and the thickness M of the two side wings of the lower assembly includes:
determining the force F borne by the test piece, the included angle A between two side wings of the lower assembly and the horizontal plane and the relative displacement S between the upper assembly and the lower assembly according to the actual working condition;
and calculating the thickness M of the two side wings of the lower assembly in a simulation mode.
Optionally, in step three, the test waveform is a trapezoidal wave.
Optionally, in step three, the test waveform is a triangular wave.
The invention has at least the following beneficial technical effects:
the fretting fatigue simulation test device can utilize a conventional fatigue testing machine to carry out the fretting test of solid materials, can solve the problem that a general material mechanical property test room cannot carry out fretting wear, and has great economic practicability and experimental research.
Drawings
FIG. 1 is a schematic view of a fretting fatigue simulation test device according to an embodiment of the present application;
FIG. 2 is a schematic view of the lower assembly of the fretting fatigue simulation test device according to one embodiment of the present application;
FIG. 3 is a schematic diagram of the components of the fretting fatigue simulation test device according to one embodiment of the present application;
FIG. 4 is a schematic illustration of a trapezoidal wave in accordance with an embodiment of the present application;
FIG. 5 is a schematic view of a triangular wave according to an embodiment of the present application;
FIG. 6 is a schematic view of a fretting fatigue simulation test process according to an embodiment of the present application;
FIG. 7 is a schematic view of a first principal stress distribution of a test piece according to one embodiment of the present application;
FIG. 8 is a schematic illustration of a test piece work surface displacement according to one embodiment of the present application;
FIG. 9 is an enlarged view of a working surface of a test piece according to one embodiment of the present application;
FIG. 10 is an enlarged cross-sectional profile of a working surface of a test piece according to one embodiment of the present application.
Wherein:
1-test piece; 11-a lower assembly; 12-an upper assembly; 2-pressing head; and 3, an upper pressure head.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present application and for simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the scope of the present application.
The present application will be described in further detail with reference to fig. 1 to 10.
The first aspect of the application provides a fretting fatigue simulation test device, including testpieces 1, lower pressure head 2 and last pressure head 3.
Specifically, as shown in fig. 1, the test piece 1 is divided into an upper part and a lower part, a lower assembly 11 and an upper assembly 12. Referring to fig. 2, the lower assembly 11 includes a lower connecting section and a lower contact section, the lower contact section has two side wings in a V shape; referring to fig. 3, the upper assembly 12 has two contact surfaces that each mate with a corresponding side wing. One end of the lower pressure head 2 is connected with a lower upright post of the fatigue testing machine, and the other end of the lower pressure head is provided with a clamping groove which is used for installing a lower connecting section; go up the one end of pressure head 3 and be connected with fatigue testing machine's last stand, the other end and last subassembly 12 butt.
The utility model provides a fretting fatigue simulation test device, the actual part that the material of testpieces 1 simulates as required is selected, when testpieces 1 preparation, can follow actual part and surely get, also can follow the blank and surely get, and the contact surface of testpieces 1 needs to process according to the contact surface condition of actual component.
In the preferred embodiment of this application, lower pressure head 2 passes through screw-thread fit with the lower stand of fatigue testing machine to be connected, goes up pressure head 3 and passes through screw-thread fit with the last stand of fatigue testing machine to be connected.
In the preferred embodiment of the present application, a salt spray tank, a temperature control tank, a gas collecting tank and the like can also be included. During the fretting fatigue simulation test, the test piece 1 is arranged in a salt spray box, so that a salt spray environment can be provided for the test piece 1; when the fretting fatigue simulation test is carried out, the test piece 1 is arranged in the temperature control box, and a high-temperature environment can be provided for the test piece 1. During the fretting fatigue simulation test, the test piece 1 is arranged in the gas collecting box, and an atmosphere environment can be provided for the test piece 1.
In the preferred embodiment of the application, the fatigue testing machine can be selected from an EHF-100KN-20L electro-hydraulic fatigue testing machine.
Based on the fretting fatigue simulation test device, the second aspect of the application provides a fretting fatigue simulation test method, which comprises the following steps:
step one, designing a test piece, and determining an included angle A between two side wings of the lower component 11 and a horizontal plane and the thickness M of the two side wings of the lower component 11;
step two, mounting a lower pressure head 2 on a lower upright of a fatigue testing machine, mounting an upper pressure head 3 on an upper upright of the fatigue testing machine, mounting a lower connecting section of a lower component 11 in a clamping groove of the lower pressure head 2, mounting two contact surfaces of an upper component 12 and two side wings of the lower component 11 in a matched manner, and butting the upper pressure head 2 against the upper component 12;
selecting a test waveform, starting a fatigue testing machine, and performing a fretting fatigue simulation test;
and fourthly, observing the wear surface of the test piece 1 through a scanning electron microscope, representing the wear surface appearance of the test piece 1 by using a 3D surface appearance instrument, and judging the fretting fatigue resistance of the material and the member.
According to the fretting fatigue simulation test method, the design of the test piece 1 relates to two important parameters, one is an included angle A between two side wings of the lower component 11 and a horizontal plane, and the other is the thickness M of the two side wings of the lower component 11. In the preferred embodiment of the present application, the force F applied to the test piece, the included angle a between the two side wings of the lower assembly 11 and the horizontal plane, and the relative displacement S between the upper assembly 12 and the lower assembly 11 can be determined according to the actual working conditions; the thickness M of the two side wings of the lower component 11 can be obtained by fixing the above 3 parameters, specifically, the thickness M of the side wings can be calculated in a simulation manner.
According to the fretting fatigue simulation test method, when the test piece 1 is assembled, the upper pressure head and the lower pressure head are respectively installed on the corresponding stand columns of the fatigue testing machine through threads, the positions of the stand columns are adjusted and fixed, and then the lower assembly 11 and the upper assembly 12 of the test piece 1 and the corresponding pressure heads are assembled in place. After the installation is finished, selecting a proper test waveform, starting a fatigue testing machine, carrying out test program setting through a control computer of the fatigue testing machine, selecting the test waveform under a displacement control program, taking the EHF-100KN-20L electro-hydraulic fatigue testing machine as an example, realizing trapezoidal waves (see figure 4) and triangular waves (see figure 5) under the reciprocating motion displacement control, setting input parameters such as maximum and minimum force, test frequency, target cycle frequency and the like, and carrying out a fretting fatigue simulation test. Advantageously, in this embodiment, the test piece 1 has a small volume, and the simulation of the corresponding environment can be realized by adding an environment box.
In the fretting fatigue simulation test method, as shown in fig. 6, after the upper assembly 12 and the lower assembly 11 of the test piece 1 are contacted, a cycle process of fretting fatigue is as follows: under the action of a force F0, two side wings of the lower assembly 11 deform to cause the included angle A to be changed into B0, so that a relative displacement S0 is generated between the upper assembly 12 and the lower assembly 11, the force F1 is increased, the deformation of the two side wings is increased to cause the included angle B0 to be changed into B1, the relative displacement is changed from S0 to S1, when the force is changed back to F0, the deformation of the two side wings is reduced, the included angle is changed back to B0, and the relative displacement is changed back to S0. The first principal stress distribution and the working face displacement of the test piece 1 are shown in fig. 7 and 8.
According to the fretting fatigue simulation test method, after the test, the test piece 1 can be adhered and worn under the action of fretting fatigue, the worn surface of the test piece 1 can be observed through instruments such as a scanning electron microscope, the 3D surface appearance instrument is used for representing the worn surface appearance of the test piece 1, the fretting fatigue resistance of materials and components is judged, and the evaluation of the test result is realized. The enlarged profile of the working surface and the enlarged profile of the cross section of the working surface of the test piece 1 are shown in fig. 9 and 10.
The fretting fatigue simulation test device and the fretting fatigue simulation test method have the advantages that by reasonably designing the test piece, a conventional fatigue testing machine can be used for carrying out the fretting test of the solid material, the problem that a general material mechanical property test room cannot carry out fretting wear is solved, fretting wear research can be carried out without purchasing fretting wear equipment, and the fretting wear simulation test device and the fretting wear simulation test method have great economic practicability and test research performance.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A fretting fatigue simulation test device, characterized by comprising:
the test piece (1) comprises a lower assembly (11) and an upper assembly (12), wherein the lower assembly (11) comprises a lower connecting section and a lower contact section, the lower contact section is provided with two V-shaped side wings, and the upper assembly (12) is provided with two contact surfaces respectively matched with the corresponding side wings;
one end of the lower pressure head (2) is connected with a lower upright post of the fatigue testing machine, and the other end of the lower pressure head is provided with a clamping groove which is used for installing the lower connecting section;
go up pressure head (3), the one end of going up pressure head (3) is connected with fatigue testing machine's last stand, the other end with go up subassembly (12) butt.
2. The fretting fatigue simulation test device of claim 1, wherein the lower pressure head (2) is connected with the lower upright of the fatigue testing machine in a screw-thread fit manner, and the upper pressure head (3) is connected with the upper upright of the fatigue testing machine in a screw-thread fit manner.
3. The fretting fatigue simulation test device of claim 1, further comprising a salt fog box, wherein the test piece (1) is arranged in the salt fog box during the fretting fatigue simulation test, and the salt fog box is used for providing a salt fog environment for the test piece (1).
4. The fretting fatigue simulation test device of claim 1, further comprising a temperature control box, wherein the test piece (1) is arranged in the temperature control box during the fretting fatigue simulation test, and the temperature control box is used for providing a high-temperature environment for the test piece (1).
5. The fretting fatigue simulation test device of claim 1, further comprising a gas collection box, wherein the test piece (1) is arranged in the gas collection box during fretting fatigue simulation test, and the gas collection box is used for providing an atmosphere environment for the test piece (1).
6. The fretting fatigue simulation test device of claim 1, wherein the fatigue tester is an EHF-100KN-20L electro-hydraulic fatigue tester.
7. A fretting fatigue simulation test method based on the fretting fatigue simulation test apparatus according to any one of claims 1 to 6, comprising:
step one, designing a test piece (1), and determining an included angle A between two side wings of the lower assembly (11) and a horizontal plane and the thickness M of the two side wings of the lower assembly (11);
step two, a lower pressure head (2) is installed on a lower upright post of the fatigue testing machine, an upper pressure head (3) is installed on an upper upright post of the fatigue testing machine, a lower connecting section of a lower assembly (11) is installed in a clamping groove of the lower pressure head (2), two contact surfaces of an upper assembly (12) and two side wings of the lower assembly (11) are installed in a matched mode, and the upper pressure head (2) is abutted to the upper assembly (12);
selecting a test waveform, starting a fatigue testing machine, and performing a fretting fatigue simulation test;
and fourthly, observing the wear surface of the test piece (1) through a scanning electron microscope, representing the wear surface appearance of the test piece (1) by using a 3D surface appearance instrument, and judging the fretting fatigue resistance of the material and the member.
8. The fretting fatigue simulation test method according to claim 7, wherein in step one, the determining the included angle A between the two flanks of the lower component (11) and the horizontal plane and the thickness M of the two flanks of the lower component (11) comprises:
determining the force F borne by the test piece, the included angle A between two side wings of the lower assembly (11) and the horizontal plane and the relative displacement S between the upper assembly (12) and the lower assembly (11) according to the actual working condition;
the thickness M of the two side wings of the lower component (11) is calculated in a simulation mode.
9. The fretting fatigue simulation test method of claim 7, wherein in step three, the test waveform is a trapezoidal wave.
10. The fretting fatigue simulation test method of claim 7, wherein in step three, the test waveform is a triangular wave.
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| CN202110870116.0A CN113720590A (en) | 2021-07-30 | 2021-07-30 | Fretting fatigue simulation test device and method |
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| CN202110870116.0A CN113720590A (en) | 2021-07-30 | 2021-07-30 | Fretting fatigue simulation test device and method |
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