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http://dx.doi.org/10.7837/kosomes.2020.26.5.542

Collapse Analysis of Ultimate Strength Considering the Heat Affected Zone of an Aluminum Stiffened Plate in a Catamaran  

Kim, Sung-Jun (GHI Group)
Seo, Kwang-Cheol (Dept. of Naval Architecture and Ocean Engineering, Mokpo National Maritime University)
Park, Joo-Shin (Central Research Institutes, Samsung heavy industries)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.26, no.5, 2020 , pp. 542-550 More about this Journal
Abstract
The use of high-strength aluminum alloys for ships and of shore structures has many benefits compared to carbon steels. Recently, high-strength aluminum alloys have been widely used in onshore and of shore industries, and they are widely used for the side shell structures of special-purpose ships. Their use in box girders of bridge structures and in the topside of fixed platforms is also becoming more widespread. Use of aluminum material can reduce fuel consumption by reducing the weight of the composite material through a weight composition ratio of 1/3 compared to carbon steel. The characteristics of the stress strain relationship of an aluminum structure are quite different from those of a steel structure, because of the influence of the welding[process heat affected zone (HAZ). The HAZ of aluminum is much wider than that of steel owing to its higher heat conductivity. In this study, by considering the HAZ generated by metal insert gas (MIG) welding, the buckling and final strength characteristics of an aluminum reinforcing plate against longitudinal compression loads were analyzed. MIG welding reduces both the buckling and ultimate strength, and the energy dissipation rate after initial yielding is high in the range of the HAZ being 15 mm, and then the difference is small when HAZ being 25 mm or more. Therefore, it is important to review and analyze the influence of the HAZ to estimate the structural behavior of the stiffened plate to which the aluminum alloy material is applied.
Keywords
Aluminium alloys; Heat affected zone; Metal inert gas welding; Yielding; Ultimate strength;
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