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

摘要

The paper investigates various existing general corrosion models for tanker structures and compares the time variant neutral axis, section modulus at deck and section modulus at keel based on various years of service. Simplified formulas to estimate time variant vertical/horizontal section modulus degradation and stress change at upper deck and keel are developed based on the double hull tanker. A fatigue assessment study which considers the new corrosion degradation model is carried out for the side shell plates of a North Sea operating shuttle tanker and of a world wide operating tanker.