CN109145335B - Method for improving low cycle fatigue life of wheel disc through pre-rotation - Google Patents
Method for improving low cycle fatigue life of wheel disc through pre-rotation Download PDFInfo
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- CN109145335B CN109145335B CN201710504610.9A CN201710504610A CN109145335B CN 109145335 B CN109145335 B CN 109145335B CN 201710504610 A CN201710504610 A CN 201710504610A CN 109145335 B CN109145335 B CN 109145335B
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Abstract
The invention belongs to the design technology of the fatigue life of an aeroengine structure, and relates to a method for improving the low cycle fatigue life of a wheel disc through pre-rotation. Firstly, carrying out fatigue tests on a material standard test bar under different pre-stretching stress conditions, thereby determining the optimal pre-stress capable of obtaining the longest service life; then, carrying out stress-strain analysis on the wheel disc structure, and determining the corresponding pre-rotation speed when the optimal pre-stress is generated at the service life checking part of the wheel disc structure; on the wheel disc rotation tester, the wheel disc is pre-rotated at the pre-rotation speed, so that the service life checking part of the wheel disc enters tensile plasticity, and after unloading, the service life checking part can bear residual compressive stress due to the action of surrounding elastic areas, thereby improving the low cycle fatigue life of the wheel disc. And the low cycle fatigue life of the wheel disc after pre-rotation is estimated according to the S-N curve after material pre-stretching, so that doubling improvement can be obtained.
Description
Technical Field
The invention belongs to the design technology of the fatigue life of an aeroengine structure, and relates to a method for improving the low cycle fatigue life of a wheel disc through pre-rotation.
Background
In the 21 st century, in order to pursue higher thrust-weight ratios, aircraft engine disk structures have tended to be lightweight, and the disk stress levels have also been gradually increased, and the disk stress concentration sites have been operated even in the plastic region, which has made the problem of low cycle fatigue of the disk very prominent. As a life key part of the aeroengine, the low cycle fatigue life of the aeroengine is a key for limiting the whole life of the engine. Modern advanced aeroengines not only require high thrust-weight ratio and other performance indexes, but also require high reliability and long service life. The service life of the whole advanced aero-engine at home and abroad is longer than 3000 hours, the service life of the aero-engine at home is generally about 1000 hours, how to improve the service life of the aero-engine becomes a difficult problem for aero-engineers, and improving the service life of the wheel disc type structure of the aero-engine is an important premise for improving the service life of the engine.
The powder metallurgy superalloy material is widely applied to modern aeroengines due to the excellent performance, FGH4097 is a newly ground powder metallurgy material in China, and the alloy has uniform structure, fine grains, good tensile strength, good endurance strength, fatigue resistance and creep resistance and is mainly used for manufacturing rotating parts such as turbine discs, high-pressure compressor discs, drum shafts, bearing rings and the like of the advanced aeroengines. The stress distribution of the wheel disc in the service state can be improved by researching the pre-rotation technology of the FGH4097 wheel disc, so that the service life of the wheel disc is prolonged, and the technology has a very good application prospect and can bring great economic benefit.
Disclosure of Invention
The purpose of the invention is that: a method for improving the low cycle fatigue life of a wheel disc by pre-rotation is provided so as to obtain higher low cycle fatigue life of the wheel disc.
Technical proposal
A method for improving the low cycle fatigue life of a wheel disc by pre-rotation comprises the following steps:
1. determining the checking position of the service life of the wheel disc through calculation, and determining the fatigue load and the temperature of the checking position;
2. selecting a plurality of stress levels near the stress range of the checking part of the service life of the wheel disc to perform pre-stretching treatment on the material standard test bar;
3. performing pre-stretching to study the influence of the pre-stretching on the fatigue life, and determining the optimal pre-stretching stress;
4. prestretching the material with optimal prestretching stress, and measuring S-N curves of the material before and after prestretching;
5. determining the pre-rotation speed of the wheel disc through calculation;
6. calculating fatigue stress of the wheel disc life checking part after pre-rotation;
7. and respectively calculating the service lives of the pre-rotating front and rear wheel discs according to the pre-stretching front and rear S-N curves, and determining the level of the improvement of the low cycle fatigue design service life of the part passing through the service life assessment of the pre-rotating wheel disc.
The invention has the advantages that: the low cycle fatigue life of the wheel disc can be improved to the maximum extent under the condition that the structure of the wheel disc and the working load condition are unchanged, and the long life requirement of an advanced aeroengine on the wheel disc is met.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is the effect of pretension on FGH4097 fatigue life;
fig. 3 is an S-N curve of FGH4097 material before and after pretensioning at 400 ℃ r=0.
Detailed Description
The present invention will be described in further detail below. A method for improving the low cycle fatigue life of a wheel disc through pre-rotation comprises the following steps:
1. according to parameters such as the rotating speed of the wheel disc, material cyclic stress and strain data, physical and mechanical properties of the material at different temperatures, the density of the material of the matched blade of the wheel disc and the like, determining a checking position of the service life of the wheel disc through calculation, and determining fatigue stress and temperature of the position;
2. selecting more than three stress levels near the stress range of the checking part of the service life of the wheel disc to prestretch the FGH4097 standard test bar, and recording tensile stress strain data;
3. the influence study of prestretching on the fatigue life is carried out, namely the fatigue life of FGH4097 standard test bars is tested after prestretching by different prestretching stresses, and the best prestretching stress is determined by comparing the fatigue life with the service life of test bars without prestretching;
4. prestretching the material with optimal prestretching stress, and measuring S-N curves of the material before and after prestretching;
5. and calculating fatigue stress of the wheel disc life assessment part under different rotating speeds by setting the rotating speeds of different wheel discs. After the optimal pre-stretching stress is converted according to the real stress, calculating and determining the preselected rotation speed omega of the wheel disc pre ；
6. Calculating fatigue stress of the wheel disc life checking part after pre-rotation;
7. and respectively calculating the service lives of the pre-rotating front and rear wheel discs according to the pre-stretching front and rear S-N curves, and evaluating the level of the improvement of the low cycle fatigue design service life of the part subjected to the service life assessment of the pre-rotating wheel discs.
Examples
1. Bolt holes at the service life checking part of a high-pressure turbine disk of an aeroengine are subjected to plasticity, and fatigue stress of the part after loading and unloading is-170 MPa-1122 MPa, and the temperature is about 400 ℃. According to Goodman's equation, the fatigue stress converted to stress ratio r=0 is 1151MPa;
2. with 1000MPa, 1100MPa, 1150MPa, 1200MPa and 1250MPa as pretension stress sigma max Pre-stretching 4 FGH4097 standard test bars respectively;
3. and (3) carrying out a fatigue test with the maximum fatigue stress of 1150MPa and R=0 on 24 test bars of the 20 pre-stretched test bars and the 4 test bars without pre-stretching in the step (2), carrying out a test study on the influence of the pre-stress on the fatigue life, and determining the optimal pre-stretching stress with the longest life. As shown in fig. 2, the optimum pretension stress is 1150MPa.
4. By performing stress fatigue test of standard test bars without pre-stretching and after pre-stressing at 1150MPa, obtaining S-N curves of FGH4097 material before and after pre-stretching at 400 ℃ R=0, as shown in FIG. 3;
5. because the pre-stress 1150MPa is engineering stress, the true pre-stretching stress of the steel bar can be determined to be sigma through the strain measurement of the steel bar or the finite element calculation pre =1240 MPa or so; stress strain analysis is carried out on the FGH4097 wheel disc, and the pre-rotation rotating speed omega of the FGH4097 wheel disc can be determined when the service life assessment point stress of the corresponding bolt part is 1240MPa pre About 120% of the operating speed.
6. Calculation for determining wheel disc passing omega pre After pre-rotation, the partial entering plasticity is more obvious, the fatigue stress of the service life checking part is-300 MPa-970 MPa, and the fatigue stress converted into stress ratio R=0 is 1050MPa through a Goodman equation;
7. substituting fatigue stress before and after the pre-rotation of the wheel disc into an S-N curve before and after pre-stretching respectively to obtain the average life of 17553 cycles before the pre-rotation and the life of 9776 cycles with reliability of 0.9987; and the average life after pre-rotation is 38121 cycles, the reliability is life 21320 of 0.9987. The calculation evaluation shows that the average value of the low cycle life of the life checking part of the pre-rotation FGH4097 wheel disc is increased by 117 percent, and the reliability is increased by 0.9987 life by 118 percent.
Claims (1)
1. A method for improving the low cycle fatigue life of a wheel disc by pre-rotation, characterized by the steps of;
step one, determining a wheel disc service life assessment part through calculation, and determining fatigue stress and temperature of the part;
selecting a plurality of stress levels near the stress range of the checking part of the service life of the wheel disc to pre-stretch the material standard test bar, wherein the stress levels are more than the yield strength of the material;
thirdly, researching the influence of pre-stretching on the fatigue life, and determining the optimal pre-stretching stress which is the stress value with the most obvious life enhancing effect;
step four, prestretching the material with the optimal prestretching stress, and measuring S-N curves of the material before and after prestretching;
step five, calculating fatigue stress of the wheel disc life checking part under different rotating speeds, converting the optimal pre-stretching stress according to the real stress, comparing the optimal pre-stretching stress with the fatigue stress calculated under different rotating speeds, and determining the pre-rotating speed omega of the wheel disc pre ；
Step six, calculating fatigue stress of the wheel disc life checking part after pre-rotation;
and step seven, respectively calculating the service lives of the pre-rotating front and rear wheel discs according to the pre-stretching front and rear S-N curves, and determining the level of improving the low cycle fatigue design service life of the checking part passing through the service life of the pre-rotating wheel disc.
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| AU2021206812B1 (en) * | 2021-07-20 | 2022-11-03 | Aecc Commercial Aircraft Engine Co., Ltd. | Method for Internal Stress Regulation in Superalloy Disk forgings by Pre-spinning |
| CN114323622B (en) * | 2022-01-05 | 2024-03-19 | 中国航发贵阳发动机设计研究所 | Method for verifying service life of powder metallurgy turbine disk through simulation piece comparison test |
| CN115356119A (en) * | 2022-07-29 | 2022-11-18 | 中国航发沈阳发动机研究所 | Design method of low-cycle fatigue life test scheme of multistage low-pressure turbine rotor |
| CN116818555B (en) * | 2023-07-25 | 2024-02-02 | 中国航发北京航空材料研究院 | Method for determining pre-rotation speed of nickel-based superalloy wheel disc blank |
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