Abstract
Nowadays, the fatigue design of ship structural members is performed based on each classification society rule. However, the considerable size of crack damage is reported sometimes soon after the service. And in the same type of ships, fatigue damage occurs in one and not occurs in the other. These facts cannot be analyzed and explained by the current fatigue design method.Then, authors have proposed new fatigue design method. The differences from the current fatigue design method are the following three points.(1) Use of fatigue crack growth analysis as the basis for fatigue strength evaluation instead of the Miner rule.(2) Implementation of author' s new storm model for the time history of stress.(3) Proposal of the new sailing model of the ship instead of the all headings model.The developed method and proposed fatigue strength charts are applicable to the initial fatigue design instead of the current fatigue design method, and also the residual fatigue life prediction in cracked structural members when fatigue cracks are found after a certain service period.
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