A New Approach to Fatigue Strength Evaluation of Ship Hull (2nd Report)

摘要

In last report, a new crack growth analysis method has been proposed for evaluating fatigue strength of a ship structural member, in which a multiple initial crack model, other than single initial crack model, is adopted and its applicability is proved by experimental results. In this report, through numerical simulations under various initial crack conditions, details of the multiple initial crack model are proposed for the evaluated ship structural member. Based on the proposed method, the fatigue strengths of as-welded joints, such as cruciform, butt and gusset-welded joints, are analyzed. The proposed multiple initial crack model is proved practicable by fatigue experimental results.