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Combined tension and bending fatigue life assessment method of blade-like specimen considering the effect of non-uniform tension-bending stress distribution and multi-damages
  • +4
  • Zhenlei Li,
  • Jiangbo Fan,
  • Duoqi SHI,
  • Hao Xu,
  • Muwei Cheng,
  • Yongshen Fan,
  • Xiaoguang YANG
Zhenlei Li
Beihang University Research Institute of Aero-Engine

Corresponding Author:lizhl@buaa.edu.cn

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Jiangbo Fan
Beihang University School of Energy and Power Engineering
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Duoqi SHI
Beihang University School of Energy and Power Engineering
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Hao Xu
Sichuan Tengden Technology Co Ltd
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Muwei Cheng
Beihang University School of Energy and Power Engineering
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Yongshen Fan
Beihang University Research Institute of Aero-Engine
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Xiaoguang YANG
Beihang University School of Energy and Power Engineering
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Abstract

This paper proposes a novel combined cycle fatigue life prediction method of a blade-like specimen considering the effect of multiple damage modes and complex stress state. Combined tensile and bending fatigue (CTBF) experiments were performed on a blade-like specimen at 850°C, using a novel biaxial tension-vibration test system. To account for the effect of high stress ratio related creep on bending fatigue damage, a creep damage factor was proposed and explicitly introduced into Lemaitre-Chaboche model. In the framework of continuum damage mechanics (CDM), the CTBF life was assessed considering the geometry-stress gradient feature factor and multiple damage modes, including the damage of LCF, high stress ratio bending fatigue and oxidation. Finally, a novel CTBF life prediction model was proposed, agreeing well with the experimental results. Compared with the existing classical models, the proposed model provides the significantly higher prediction accuracy.