Journal
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
Volume 41, Issue 6, Pages 1291-1305Publisher
WILEY
DOI: 10.1111/ffe.12772
Keywords
fatigue; reliability; sensitivity analysis; turbine disc; uncertainty
Funding
- National Natural Science Foundation of China [11672070, 11302044]
- China Postdoctoral Science Foundation [2015M582549, 2017T100697]
- Fundamental Research Funds for the Central Universities [ZYGX2016J208]
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Hot section components of aircraft engines like high pressure turbine (HPT) discs usually operate under complex loadings coupled with multi-source uncertainties. The effect of these uncertainties on structural response of HPT discs should be accounted for its fatigue life and reliability assessment. In this study, a probabilistic framework for fatigue reliability analysis is established by incorporating FE simulations with Latin hypercube sampling to quantify the influence of material variability and load variations. Particularly, variability in material response is characterized by combining the Chaboche constitutive model with Fatemi-Socie criterion. Results from fatigue reliability and sensitivity analysis of a HPT disc indicated that dispersions of basic variables {rho, omega 1, sigma(f)'} must be taken into account for its fatigue reliability analysis. Moreover, the proposed framework based on the strength-damage interference provides more reasonably correlations with its field number of flights rather than the load-life interference one.
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