Hull Girder Ultimate Strength Assessment Considering Local Corrosion
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RESEARCH ARTICLE
Hull Girder Ultimate Strength Assessment Considering Local Corrosion Van Tuyen Vu 1 & Duc Tuan Dong 1 Received: 22 December 2019 / Accepted: 27 July 2020 # Harbin Engineering University and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The residual strength capacity of ship hull with full corrosion appearance in every structural member has been considered in a large number of research works; however, the influence of local corrosion on the ultimate strength and cross-section properties has not been taken into account and analyzed. Hence, this study aims to assess the effect of corrosion appearance in the flange section and web section on the ultimate vertical bending moment and several cross-section properties of a bulk carrier. To perform this task, a probabilistic corrosion rate estimation model and the common structural rule model are introduced and employed. The incremental-iterative method given by the International Association of Classification Societies-Common Structural Rules (IACS-CSR) is applied to determine the ultimate vertical bending moment, neutral axis position at the limit state, and other properties of the cross-section. The calculation results and discussions relative to the effect of corrosion on ship hull are presented. Keywords Corrosion wastage . Corrosion model . Ultimate strength . Ship hull . Cross-section
1 Introduction The aging ship structures always comprise several damages such as corrosion, fatigue cracks, and local dents. Among these factors, corrosion is the most important and serious (Kim et al. 2012a). The corrosion wastage might appear in every zone of ship structures, but several locations in the hold are more susceptible to corrosion than others such as the inner bottom, lower and upper sloping plates, hold frame, side shell plate, deck plate, shear strake, and deck longitudinal (Paik et al. 1998). The corrosion appearance in the marine structures is Article Highlights • The total cross-sectional area (CSA) of all longitudinal stiffeners in a panel is always smaller than this value of the attached plating in the same panel. • For bulk carriers, the CSA of side panel is the biggest, but the influence of the CSA reduction on ultimate bending moment (UBM) degradation is the smallest. • Deck panel has the most effect on the UBM of bulk carriers. * Van Tuyen Vu [email protected] 1
Faculty of Shipbuilding, Vietnam Maritime University, Haiphong 180000, Vietnam
caused by a large number of factors such as protection systems, type of cargo, temperature, humidity, oxygen content, pH level, and chemical composition (Paik et al. 2003c). Due to the complex working environment of marine structures, many modes of corrosion can appear in the metal’s surface such as general corrosion, pitting corrosion, grooving corrosion, crevice corrosion, galvanic corrosion, erosion-corrosion, cavitation, stress corrosion, and corrosion fatigue (Guedes Soares and Garbatov 1997). Facts indicate that the pitting corrosion and general corrosion are the most pop
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