Bimodal Concept of High-Cycle Fatigue Life Prediction for Constant and Variable Amplitude Fatigue
A bimodal concept for the prediction of the high-cycle fatigue life of structural details subjected to constant- or variable-amplitude loading is considered in this paper. The total fatigue life was separated into two phases: crack initiation and crack propagation. The portion of life spent in crack initiation was estimated by using S–N data obtained on smooth specimens. A fracture mechanics concept was used to calculate the portion of life spent in crack propagation, and the S–N curve, including the fatigue limit of a structural detail, was determined by using material properties and the geometry of the detail. The bimodal concept was applied to a welded stiffener and the results are compared with experimental data reported in the literature.
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Document Type: Research Article
Affiliations: Department of Mechanical Engineering, University of Montenegro, 81000 Podgorica, Yugoslavia
Publication date: 1998-12-01