engleski

Simplified procedures for fatigue assessment of ship structures

Comparison of simplified procedures for fatigue assessment of ship structural details, used by classification societies, is presented. The basics of typical fatigue design approaches are described. In order to illustrate the capabilities and differences of the procedures, comparative study is performed on a bulk carrier built in Croatian shipyard in Split. Fatigue damage is calculated for a few longitudinals in connection with transverse structural elements. Longitudinals are located in the hopper tank, topside tank and double bottom of the bulk carrier. Fatigue damage of critical details is calculated applying current rules and guidelines of the classification societies Bureau Veritas, Germanischer Lloyd and Lloyd's Register of Shipping. The effect of a few input parameters on fatigue life is studied in a parameter variation including the shape parameter of the Weibull long-term stress distribution, structural misalignment and the effect of corrosion.

ship stuctural design; fatigue assessment; simplified procedures

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