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Simplification of Low-Cycle Creep-Fatigue Load Spectrum of Combustion Chamber and Life Assessment for Feature
Dingnan Cheng1, Honghua Zhao1,2, Qiang Zhang1
1AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China.
Materials (Basel, Switzerland)
|February 13, 2026
Summary
This study simplifies combustion chamber load spectra for creep-fatigue analysis, accurately predicting component life. Simplified spectra show minimal error, validating the approach for engineering applications.
Area of Science:
- Materials Science
- Mechanical Engineering
- Aerospace Engineering
Background:
- Combustion chambers experience complex loading during flight stages.
- Accurate prediction of low-cycle creep-fatigue life is crucial for component durability.
- Existing load spectra can be overly complex for efficient analysis.
Purpose of the Study:
- To simplify the low-cycle creep-fatigue (LCCF) load spectrum of a combustion chamber.
- To predict the LCCF life of simulated combustion chamber specimens using the simplified spectrum.
- To experimentally verify the accuracy of the simplified load spectrum.
Main Methods:
- Application of the damage equivalence principle for load spectrum simplification.
- Development of simplified load spectra representing flight conditions (low speed, takeoff, climb, cruise).
- Experimental testing of flat-plate and circular tube specimens with single and multiple holes.
Main Results:
- The simplified load spectrum showed an average life error of 6.13% compared to the original spectrum in LCCF tests.
- Test results for simplified and original spectra were within the double dispersion band of their average values.
- Specimen test results generally fell within predicted dispersion bands, with circular tubes showing a fourfold band.
Conclusions:
- The simplified load spectrum effectively predicts low-cycle creep-fatigue life with acceptable accuracy.
- Cooling gas application in circular tube specimens significantly improved LCCF life by reducing temperature.
- The damage equivalence principle provides a viable method for simplifying complex LCCF load spectra in aerospace components.
Keywords:
GH3230 superalloycreep–fatiguelife predictionoriginal load spectrumsimplified load spectrumMore Related Videos
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