Time-variant Corrosion Degradation, Hull Girder Strength andFatigue Assessment for Ageing Double Hull Tankers

摘要

The paper investigates various existing general corrosion models forrntanker structures and compares the time variant neutral axis, sectionrnmodulus at deck and section modulus at keel based on various years ofrnservice. Simplified formulas to estimate time variant vertical/horizontalrnsection modulus degradation and stress change at upper deck and keelrnare developed based on the double hull tanker. A fatigue assessmentrnstudy which considers the new corrosion degradation model is carriedrnout for the side shell plates of a North Sea operating shuttle tanker andrnof a world wide operating tanker.