13. The Effect of Whipping Stress on Fatigue Strength of a Fast Container Ship in Rough Seas

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It has recently been recognized that structural failures of ocean-going vessels in rough seas are closely related to the dynamic hull girder stresses induced by slamming impact and by nonlinear dynamical forces acting on bow flare. In the present paper, fatigue strength of a container ship is investigated for structural members with high stress concentration factors, where the applied stress is composed of wave induced bending stresses including nonlinear effects and whipping stresses. Having calculated the dynamic stresses arising in a hull girder in rough seas, fatigue strength of highly stressed portions is examined by using appropriate S-N curves. When a high speed vessel passes through rough seas, it is found that the significant increase of the repeated stress ranges due to the superposed whipping component of stresses may drastically reduce the fatigue life of highly stressed structural members.
社団法人日本船舶海洋工学会の論文