Abstract
The superposition of low-frequency (LF) wave loads and high-frequency (HF) loads resulting from springing and whipping will cause coupling damage due to the interaction of various frequency load components. In this study, a series of fatigue tests under different high-low frequency superimposed loading (called ‘‘superimposed loading’’ hereafter) conditions were carried out, and the co-simulation of FRANC3D and ABAQUS was utilized to explore the influence of high-low frequency coupling damage on the fatigue life and crack propagation characteristics of the typical welded joint of hull structures. The results indicated that the coupling damage has a significant influence on the decrease of fatigue life, especially on the crack propagation life. In parallel, the intermittent HF loads could also lead to fatigue life reduction and should be paid attention to. Moreover, based on the simulation, a correction coefficient of effective stress intensity factor considering the influence of coupling damage was proposed.
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