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RESEARCH PAPERS

Fatigue Reliability of Maintained Welded Joints in the Side Shell of Tankers

[+] Author and Article Information
Y. Garbatov, C. Guedes Soares

Unit of Marine Technology and Engineering, Instituto Superior Técnico, Avenida Rovisco Pais, 1096 Lisboa, Portugal

J. Offshore Mech. Arct. Eng 120(1), 2-9 (Feb 01, 1998) (8 pages) doi:10.1115/1.2829516 History: Received February 01, 1997; Revised June 29, 1997; Online December 17, 2007

Abstract

A formulation is presented for the assessment of the reliability of a local ship hull structure regarding fatigue failure. The potential cracks are considered to occur in the side shell, in the connections between longitudinal stiffeners and transverse web frame. The analysis is performed for T-shaped stiffeners. The model accounts for the crack growth process applying linear elastic fracture mechanics. The long-term stress range acting on the elements is defined as a function of the local transverse pressure of internal cargo and outside water, combined with the stresses resulting from the longitudinal bending of the hull. The global hull loading is a combination of horizontal and vertical bending moments. The present paper analyzes the importance of including the transverse pressure loading for the process of the crack growth and also the distribution of the net section area of midship and location of stiffeners. The formulation has been applied to a tanker. The fatigue reliability is predicted by a time variant formulation and the effects of maintenance actions in updating the reliability assessment are shown.

Copyright © 1998 by The American Society of Mechanical Engineers
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