科研之友
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摘要
Storm model proposed by Tomita and coworkers is a simplified random loading model for fatigue strength assessment of ship structures. The time dependent random wave loading can be expressed by the storm model. The basic characteristics of storm model and short-term distribution situation of wave-induced stress are described. Storm model is combined with a unique crack growth rate curve and SIF calculation equations for surface crack in the weld toe, and the procedure to predict the fatigue crack growth behavior of ship structures under complex loading conditions is discussed. Weight function is used to calculate SIF of surface crack under given residual stress distribution. Fatigue crack growth behavior of surface crack at weld toe of butt welded joint in ship hull under storm wave loading condition is predicted. The results show that the size and order of storms, the initial size of crack and residual stress have significant effect on crack growth behavior. Reasonable storm model parameters and initial crack size are very important for fatigue life prediction of ship structures.
