Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 113, Issue -, Pages 33-42Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2018.04.006
Keywords
Strain energy gradient; Fatigue; Life prediction; Turbine disc; Theory of critical distance
Funding
- National Natural Science Foundation of China [11672070, 11302044]
- China Postdoctoral Science Foundation [2017T100697, 2015M582549]
- Fundamental Research Funds for the Central Universities [ZYGX2016J208]
- Polimi International Fellowship Grant scheme
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For aeroengine components with geometrical discontinuities like notches, low cycle fatigue (LCF) life prediction is critical for ensuring the engine structural integrity. In this regard, a concept of strain energy gradient is elaborated and a general procedure combining this concept with theory of critical distance is established for LCF life prediction of notch components, which relates its life with the strain energy distributed within the effective damage zone. For GH4169 and TC4 notched specimens as well as a case study of a high pressure turbine disc, the proposed procedure provides better life correlations than models of Fatemi-Socie and Smith-Watson-Topper.
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