CN115372182B - Accelerated life test method for polytetrafluoroethylene hose for aeroengine - Google Patents
Accelerated life test method for polytetrafluoroethylene hose for aeroengine Download PDFInfo
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- CN115372182B CN115372182B CN202210909522.8A CN202210909522A CN115372182B CN 115372182 B CN115372182 B CN 115372182B CN 202210909522 A CN202210909522 A CN 202210909522A CN 115372182 B CN115372182 B CN 115372182B
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- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 39
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 39
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 39
- 238000010998 test method Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 125
- 230000001133 acceleration Effects 0.000 claims description 13
- 238000005452 bending Methods 0.000 claims description 12
- 238000012937 correction Methods 0.000 claims description 8
- 239000000295 fuel oil Substances 0.000 claims description 6
- 239000010687 lubricating oil Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 3
- 239000011888 foil Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 210000004204 blood vessel Anatomy 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The application belongs to the technical field of engine part tests, and particularly relates to a polytetrafluoroethylene hose accelerated life test method for an aeroengine. Determining the pressure working condition of a polytetrafluoroethylene hose, and selecting a typical test procedure; testing and refitting, and installing a pressure measuring joint; carrying out strain foil pasting; carrying out a test according to a typical test run program to obtain pressure and stress values; performing a pressure test, and correcting the pressure and the stress; obtaining a pressure working condition map, and carrying out a test according to the working condition map; and analyzing the test data to obtain the test life. The application provides technical support for the life test of the polytetrafluoroethylene hose, and compared with the traditional life test by test run, the test efficiency is greatly improved.
Description
Technical Field
The application belongs to the technical field of engine part tests, and particularly relates to a polytetrafluoroethylene hose accelerated life test method for an aeroengine.
Background
In an aeroengine, an external pipeline plays a role in conveying media such as fuel oil, lubricating oil and air, is a blood vessel of the aeroengine, and the working reliability of the blood vessel directly influences the safety of the aeroengine. Polytetrafluoroethylene hoses are widely used in external pipelines of aircraft engines, and attention is paid to the characteristics of displacement compensation, vibration reduction, noise reduction and the like. However, the polytetrafluoroethylene hose is easy to damage under the action of the pressure and vibration working conditions of the aeroengine, the working safety of the engine is affected, and meanwhile, the polytetrafluoroethylene hose is structurally composed of a polytetrafluoroethylene inner tube, a steel wire reinforcing layer, a vulcanized rubber layer and the like, and once damage occurs, the polytetrafluoroethylene hose is inconvenient to check. To ensure the safety of the aeroengine, the hose needs to be replaced regularly. And the replacement strategy of the polytetrafluoroethylene hose is determined according to the service life of the hose, so that the safety of the aeroengine is ensured. The hose life is generally obtained through a test mode, so that the polytetrafluoroethylene hose accelerated life test method for the aero-engine is significant for the use of the polytetrafluoroethylene hose on the aero-engine.
At present, the test of the aero-engine hose is generally verified through complete machine test run, in technical aspect, the purpose of testing the service life of the hose is achieved through the on-hook test run, the problem of long test period exists, and meanwhile, the safety of the engine is seriously affected by pipeline damage. In the aspect of cost, because the test time of the whole aeroengine is long, higher cost is caused, and the aeroengine is difficult to use in actual engineering. In the aspect of efficiency, the efficiency is extremely low, and the requirement of the tension development period of the aero-engine cannot be met. In addition, the metal pipeline of the aero-engine can also be used for determining the service life of the pipeline in a vibration fatigue test mode, and the test is mainly carried out based on the theory that the vibration environment of the aero-engine causes accumulated damage to the metal pipeline. In technical terms, polytetrafluoroethylene hoses are relatively sensitive to pressure pulsations and therefore do not correspond to the failure cause and failure mode of metal hard tubes and are therefore not feasible to perform by way of hard tube testing.
Disclosure of Invention
In order to solve one of the problems, the application provides a polytetrafluoroethylene hose accelerated life test method for an aeroengine, which is researched by the polytetrafluoroethylene hose accelerated life test method for the aeroengine, solves the problem that the polytetrafluoroethylene hose determines the life through the accelerated life test, and provides guidance and technical support for maintenance and measurement of the aeroengine. Meanwhile, technical support is provided for hose development and examination.
The application relates to a polytetrafluoroethylene hose accelerated life test method for an aeroengine, which mainly comprises the following steps:
Step one, selecting a plurality of engine working conditions;
determining a pipeline with the maximum pressure under each hose specification in an aeroengine fuel and lubricating oil system, measuring the included angle and the bending radius of the pipeline in a mounting state, refitting the pipeline, and adding a connector with a pressure sensor on the pipeline to form a test pipeline;
Step three, mounting the test pipeline to a test engine;
Step four, installing a plurality of strain gauges on a test pipeline;
Step five, under each engine working condition, determining the test pressure of the test pipeline and the strain equivalent value corresponding to the test pressure;
Step six, executing the step three to the step five on a plurality of engines to obtain a test pressure average value of the test pipeline and a strain equivalent average value corresponding to the test pressure average value;
Step seven, according to the included angle and the bending radius of the pipeline measured in the step two and the mounting mode of the strain gauge in the step four, changing one end of the test pipeline into a connection hydraulic device, applying pressure by the hydraulic device, plugging the other end of the test pipeline, applying the test pressure average value obtained in the step six, reading the strain value of the test pipeline, if the strain value is consistent with the strain equivalent average value in the step six, taking the applied pressure value as a value to be tested, otherwise, increasing the pressure applied by the hydraulic device until the read strain value is consistent with the strain equivalent average value in the step six, and taking the new applied pressure value as the value to be tested;
Step eight, forming an acceleration test pressure map according to the values to be tested and the engine working conditions corresponding to the values to be tested, wherein in the acceleration test pressure map, the value to be tested corresponding to each engine working condition lasts for a set time;
Step nine, installing a plurality of test pieces to be tested with the same specification on an engine according to the included angle and the bending radius of the pipeline measured in the step two and the mounting mode of the strain gauge in the step four, carrying out pressure loading according to the acceleration test pressure map in the step eight, completing one working cycle, continuously applying the working cycle to the pipeline until the pipeline is damaged, recording the cycle number, and determining the service life of the test pieces to be tested according to the cycle number corresponding to the obtained test pieces to be tested with different specifications.
Preferably, in the first step, the engine working condition includes a slow vehicle, a maximum continuous, a maximum take-off or an intermediate state.
Preferably, in the first step, the number of working conditions is not less than 5.
Preferably, in the fourth step, at least three strain gauges are installed, and when the number of the strain gauges is three, one strain gauge is located in the middle of the polytetrafluoroethylene hose, and the other strain gauge is located at two ends of the polytetrafluoroethylene hose.
Preferably, each strain gauge comprises two strain gauge units arranged perpendicular to each other, wherein one strain gauge unit is arranged along the axial direction of the polytetrafluoroethylene hose.
Preferably, in the fifth step, each working condition lasts for five minutes, the average pressure value in the fourth minute is taken as the test pressure, and the maximum value measured by the plurality of strain gauges is taken as the strain equivalent value.
Preferably, in the eighth step, the set time is 30s.
Preferably, in step nine, the lifetime λ of the test piece to be tested is:
Wherein, C is the life correction coefficient, M is the number of test pieces to be tested of the same specification for testing, and Z m is the number of cycles of the mth test piece to be tested.
The application provides a method for determining the pressure working condition of a polytetrafluoroethylene hose, the test state of the hose, a temperature displacement correction method, a related method for accelerating test pressure working condition patterns, a method for acquiring the service life of the hose through an acceleration test, and a method for determining the test service life through the obtained test number. The data processing process is thinned, the temperature and pressure correction method and the test state determination method are clarified, and the service life obtained through the test can be used for guiding an assessment test of polytetrafluoroethylene for an aeroengine and providing guidance for the establishment of a hose maintenance strategy.
Drawings
FIG. 1 is a flow chart of a preferred embodiment of a polytetrafluoroethylene hose accelerated life test method for an aircraft engine of the present application;
FIG. 2 is a schematic view of a hose structure and strain gage installation;
FIG. 3 is a schematic illustration of an acceleration test pressure profile;
Fig. 4 is a hydraulic loading schematic.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application become more apparent, the technical solutions in the embodiments of the present application will be described in more detail with reference to the accompanying 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 some, but not all, embodiments of the application. The embodiments described below by referring to the drawings are exemplary and intended to illustrate the present application and should not be construed as limiting the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to fall within the scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
The application provides a polytetrafluoroethylene hose accelerated life test method for an aeroengine, which is shown in figure 1 and mainly comprises the following steps:
Step one, selecting a plurality of engine working conditions.
And selecting typical working conditions of the engine, including slow running, maximum continuous, maximum take-off and a plurality of intermediate states. The typical working conditions are determined based on the typical working process of the test engine, wherein slow running and maximum take-off are necessary, other states can be increased or decreased as appropriate, and the total number of working conditions is not less than 5. In one embodiment, 8 conditions as shown in Table 1 are selected.
Table 1, working conditions and corresponding pressure and strain measurement results.
Determining a pipeline with the maximum pressure under each hose specification in the fuel and lubricating oil system of the aeroengine, measuring the included angle and the bending radius of the pipeline in the installed state, refitting the pipeline, and adding a joint with a pressure sensor on the pipeline to form a test pipeline.
According to the fuel and oil system diagram of the aero-engine, the included angle a and the bending radius R of the pipeline in the installed state are measured according to the pipeline with the maximum pressure under each specification, and the included angle a and the bending radius R are shown in fig. 2. The pipeline is tested and refitted, a test joint is added, a small joint is adopted for the pipeline with the drift diameter less than or equal to 20mm, a large joint is adopted for the pipeline with the drift diameter more than 20mm, the small joint is required to be opened on the pipeline, fluid in the pipeline is introduced into the small joint, and the large joint is used for arranging the pipeline into two parts and connecting the two parts. The engine fuel and lubricating oil system diagram can also be a pipeline working pressure value given in the design process, and the engine fuel and lubricating oil system diagram is only used for selecting a pipeline with the highest pressure in pipelines with the same specification. Both connectors are provided with interfaces connected with pressure sensing, so that the connector can be installed with a sensor, reliable test is realized, and the connector is provided with an anti-loose wire locking hole and used for guaranteeing test safety.
And step three, mounting the test pipeline on a test engine.
And fourthly, installing a plurality of strain gauges on the test pipeline.
In an alternative embodiment, the strain gauge is respectively attached to 3 measuring points on the surface of the rubber layer of the hose at the same distance along the axial direction and the circumferential direction, as shown in fig. 2, the first strain gauge 4 is near one end of the hose joint, and the strain gauge is two strain gauge units which are arranged at 90 degrees in an intersecting way, wherein one strain gauge unit is arranged along the axial direction; the second strain gage 5 is disposed at an intermediate position, and the mounting requirements are the same as those of the first strain gage 4, the third strain gage 6 is a joint close to the other end, and the mounting requirements are the same as those of the first strain gage 4.
And fifthly, under each engine working condition, determining the test pressure of the test pipeline and the strain equivalent value corresponding to the test pressure.
According to the test procedure of table 1, engine test runs were performed, pipeline test data were obtained by the test, and the average pressure in the 4 th minute in each state was taken as the test pressure and denoted as P Status of X (X is the state number in table 1). The equivalent value η X of the maximum strain at three points is recorded.
Wherein eta x is a strain record value, epsilon x Circumference of circumference i is the circumferential strain of the ith measuring point measured in the state x, epsilon x Shaft i is the axial strain of the ith measuring point measured in the state x, and i is the measuring point positions 4,5 and 6.
And step six, executing the step three to the step five on a plurality of engines to obtain a test pressure average value of the test pipeline and a strain equivalent average value corresponding to the test pressure average value.
In this embodiment, the number of engines N is generally not less than four. Thus, a set of calculations will be obtained
Wherein N is 1,2,3,4 … … N.
And step seven, according to the included angle and the bending radius of the pipeline measured in the step two and the mounting mode of the strain gauge in the step four, changing one end of the test pipeline into a connection hydraulic device, applying pressure by the hydraulic device, plugging the other end of the test pipeline, applying the test pressure average value obtained in the step six, reading the strain value of the test pipeline, if the strain value is consistent with the strain equivalent average value in the step six, taking the applied pressure value as a value to be tested, otherwise, increasing the pressure applied by the hydraulic device until the read strain value is consistent with the strain equivalent average value in the step six, and taking the new applied pressure value as the value to be tested.
The step is to correct the displacement and temperature of the hose, clamp the hose according to the state of the hose on the engine, ensure that the bending radius R and the included angle a of the two ends are the same as the installed state of the engine, and attach a strain gauge. One end of the hose is free and is plugged by a plug, and the other end of the hose is fixed and connected with a hydraulic device. First, the maximum pressure is applied, the strain value eta is read, ifThe applied pressure value P correction X is recorded. Otherwise, the pressure continues to increase until/>The applied pressure value P correction X is recorded. Thereafter, P correction X is taken as the value to be tested P Test for subsequent testing, where each test value corresponds to an engine operating condition.
And step eight, forming an acceleration test pressure map according to the values to be tested and the engine working conditions corresponding to the values to be tested, wherein the values to be tested corresponding to the working conditions of each engine in the acceleration test pressure map last for a set time. As shown in fig. 3, the acceleration test pressure maps were first expressed using time coordinates, each test value was continued for 30s, and then converted into the acceleration test pressure maps expressed as pressure, as shown in fig. 4.
Step nine, installing a plurality of test pieces to be tested with the same specification on an engine according to the included angle and the bending radius of the pipeline measured in the step two and the mounting mode of the strain gauge in the step four, carrying out pressure loading according to the acceleration test pressure map in the step eight, completing one working cycle, continuously applying the working cycle to the pipeline until the pipeline is damaged, recording the cycle number, and determining the service life of the test pieces to be tested according to the cycle number corresponding to the obtained test pieces to be tested with different specifications.
In an alternative embodiment, in step nine, the lifetime λ of the test piece to be tested is:
Wherein, C is a life correction coefficient, for example, set to 0.83, M is the number of test pieces to be tested of the same specification for performing the test, and Z m is the number of cycles of the mth test piece to be tested. M is usually an integer of 6 or more.
According to the application, through the designed test method, the acquisition method of life test parameters and the method for testing the life of the polytetrafluoroethylene hose for the aero-engine are defined, and technical support is provided for the life test of the polytetrafluoroethylene hose. Compared with the traditional life test by trial run, the test efficiency is greatly improved.
While the application has been described in detail in the foregoing general description and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the application and are intended to be within the scope of the application as claimed.
Claims (8)
1. The accelerated life test method of the polytetrafluoroethylene hose for the aeroengine is characterized by comprising the following steps of:
Step one, selecting a plurality of engine working conditions;
determining a pipeline with the maximum pressure under each hose specification in an aeroengine fuel and lubricating oil system, measuring the included angle and the bending radius of the pipeline in a mounting state, refitting the pipeline, and adding a connector with a pressure sensor on the pipeline to form a test pipeline;
Step three, mounting the test pipeline to a test engine;
Step four, installing a plurality of strain gauges on a test pipeline;
Step five, under each engine working condition, determining the test pressure of the test pipeline and the strain equivalent value corresponding to the test pressure;
Step six, executing the step three to the step five on a plurality of engines to obtain a test pressure average value of the test pipeline and a strain equivalent average value corresponding to the test pressure average value;
Step seven, according to the included angle and the bending radius of the pipeline measured in the step two and the mounting mode of the strain gauge in the step four, changing one end of the test pipeline into a connection hydraulic device, applying pressure by the hydraulic device, plugging the other end of the test pipeline, applying the test pressure average value obtained in the step six, reading the strain value of the test pipeline, if the strain value is consistent with the strain equivalent average value in the step six, taking the applied pressure value as a value to be tested, otherwise, increasing the pressure applied by the hydraulic device until the read strain value is consistent with the strain equivalent average value in the step six, and taking the new applied pressure value as the value to be tested;
Step eight, forming an acceleration test pressure map according to the values to be tested and the engine working conditions corresponding to the values to be tested, wherein in the acceleration test pressure map, the value to be tested corresponding to each engine working condition lasts for a set time;
Step nine, installing a plurality of test pieces to be tested with the same specification on an engine according to the included angle and the bending radius of the pipeline measured in the step two and the mounting mode of the strain gauge in the step four, carrying out pressure loading according to the acceleration test pressure map in the step eight, completing one working cycle, continuously applying the working cycle to the pipeline until the pipeline is damaged, recording the cycle number, and determining the service life of the test pieces to be tested according to the cycle number corresponding to the obtained test pieces to be tested with different specifications.
2. The accelerated life test method of polytetrafluoroethylene hose for an aircraft engine according to claim 1, wherein in step one, said engine conditions include slow running, maximum continuous, maximum take-off or intermediate conditions.
3. The accelerated life test method of polytetrafluoroethylene hose for aeroengine as in claim 1, wherein in step one, the number of said working conditions is not less than 5.
4. The accelerated life test method of polytetrafluoroethylene hose for aeroengine according to claim 1, wherein in the fourth step, at least three strain gauges are installed, and when the number of the strain gauges is three, one strain gauge is located in the middle of the polytetrafluoroethylene hose, and the other strain gauge is located at two ends of the polytetrafluoroethylene hose.
5. The accelerated life test method of polytetrafluoroethylene hose for an aircraft engine according to claim 4, wherein each strain gauge includes two strain gauge units arranged perpendicular to each other, wherein one strain gauge unit is arranged along an axial direction of the polytetrafluoroethylene hose.
6. The accelerated life test method of polytetrafluoroethylene hose for aeroengine according to claim 1, wherein in the fifth step, each working condition lasts for five minutes, and the average pressure value in the fourth minute is used as test pressure, and the maximum value measured by a plurality of strain gauges is used as strain equivalent value.
7. The accelerated life test method of polytetrafluoroethylene hose for an aircraft engine according to claim 1, wherein in the eighth step, the set time is 30s.
8. The accelerated life test method of polytetrafluoroethylene hose for aeroengine as defined in claim 1, wherein in step nine, life λ of the test piece to be tested is:
Wherein, C is the life correction coefficient, M is the number of test pieces to be tested of the same specification for testing, and Z m is the number of cycles of the mth test piece to be tested.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210909522.8A CN115372182B (en) | 2022-07-29 | 2022-07-29 | Accelerated life test method for polytetrafluoroethylene hose for aeroengine |
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| CN202210909522.8A CN115372182B (en) | 2022-07-29 | 2022-07-29 | Accelerated life test method for polytetrafluoroethylene hose for aeroengine |
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| CN115372182B true CN115372182B (en) | 2024-05-17 |
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|---|---|---|---|---|
| JPH06265458A (en) * | 1993-03-11 | 1994-09-22 | Hitachi Cable Ltd | Hose piping part external force measuring method |
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2022
- 2022-07-29 CN CN202210909522.8A patent/CN115372182B/en active Active
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| CN115372182A (en) | 2022-11-22 |
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