An improved fatigue damage model based on the virtual load spectrum of golden section method. Issue 8 (25th May 2021)

• Record Type: Journal Article
• Authors: Liu, Yating; Ye, Nanhai; Hu, Xiulin; Zhao, Gongwei
• Is Part Of: Fatigue & fracture of engineering materials & structures. Volume 44:Issue 8(2021)
• Page Start: 2101
• Page End: 2118
• Publication Date: 2021-05-25
• Subjects: fatigue life prediction -- golden section method -- improved damage model -- predetermined reliability -- virtual load spectrum; Materials -- Fatigue -- Periodicals; Fracture mechanics -- Periodicals; 620.1123
• DOI: 10.1111/ffe.13481
• Languages: English
• ISSNs: 8756-758X

Abstract

Abstract: This paper presents an improved damage model based on the construction technology of nonlinear partition virtual load spectrum by golden section method which is closer to the actual condition. In contrast to the Palmgren–Miner classical model, the result of fatigue life is more accurate. The improved damage model uses reliability instead of cumulative fatigue damage as the fatigue failure criterion. The objectives in this paper include verifying the convergence of the improved model and analyzing the influence of key parameters on fatigue life. The correction coefficient of the key parameters outperforms the traditional model which ignores the effect of stress sequence on fatigue. The fatigue life of several typical models and improved model is calculated and compared with the experimental results. It is shown that the improved model has higher accuracy and safety.