Abstract No.F180130-160
Author name(s): Mizuki Morishita1, Koji Gotoh1, Yosuke Anai2, Toshio Niwa2
Company: 1. Kyushu University, Japan; 2. National Maritime Research Institute, Japan
Fatigue surface crack propagation under the biaxial tensile loading, of which loading directions are normal and parallel to the initial crack position, is highlighted in this study. Most of in-service structures are subjected to many types of loading and these loadings have different axial components with different phases. In-addition, most of the fatigue cracks occurring in the structures are so-called surface cracks which are elliptical and partly found on the plate surface. The integrities of structures are evaluated according to design codes established by theoretical and experimental investigations under uniaxial loading condition. Fatigue crack propagation behavior is evaluated by using the specimen with a through thickness crack. In this study, the fatigue surface crack propagation behavior under biaxial cyclic loading with different phase was investigated. Two different types of initial crack shape were applied. The numerical simulation to estimate the fatigue crack propagation under biaxial cyclic loading with different phase was improved to apply to the surface crack problem.
KEY WORDS: fatigue; fatigue crack propagation; biaxial fatigue; phase difference; Strip Yield Model; RPG stress; surface crack
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