Journal
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
Volume 42, Issue 1, Pages 45-60Publisher
WILEY
DOI: 10.1111/ffe.12865
Keywords
fatigue crack growth rates; high cycle fatigue; long crack; short crack; stress intensity factor; UniGrow model
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In this paper, a modification of the UniGrow model is proposed to predict total fatigue life with the presence of a short fatigue crack by incorporating short crack propagation into the UniGrow crack growth model. The UniGrow model is modified by 2 different methods, namely the short crack stress intensity correction method and the short crack data-fitting method to estimate the total fatigue life including both short and long fatigue crack propagations. Predicted fatigue lives obtained from these 2 methods were compared with experimental data sets of 2024-T3, 7075-T56 aluminium alloys, and Ti-6Al-4V titanium alloy. Two proposed methods have shown good fatigue life predictions at relatively high maximum stresses; however, they provide conservative fatigue life predictions at lower stresses corresponding high cycle fatigue lives where short crack behaviour dominates total fatigue life at lower stress levels.
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