Study on Ultimate Compressive Strength of Aluminium-Alloy Plates and Stiffened Panels
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RESEARCH ARTICLE
Study on Ultimate Compressive Strength of Aluminium-Alloy Plates and Stiffened Panels Bin Liu 1 & Van Tuyen Doan 1,2 & Y. Garbatov 3 & Weiguo Wu 1 & C. Guedes Soares 3 Received: 15 March 2020 / Accepted: 30 August 2020 # Harbin Engineering University and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This work reviews the ultimate compressive strength of aluminium plates and stiffened panels. The effect of boundary condition, initial imperfection, welding-induced residual stress and heat-affected zone are discussed. As the effect of manufacturing technology lacks in the literature, this effect is analysed employing the finite element method, considering the technology of welding and integrated extrusion. The numerical analyses have shown that the ultimate strength of the integrated extruded stiffened panel is relatively higher than the one of the traditional welded panel. Keywords Ultimate strength . Compressive load . Stiffened panel . Aluminium alloy . Review
1 Introduction Stiffened panels are the main structural components in ship hull girders. The buckling failure of deck or bottom stiffened panels may lead to the overall collapse of ships. Unlike columns which buckling implies the collapse, plates and stiffened panels can sustain further loads after the buckling occurs locally in the elastic or even inelastic regime. The design and strength assessment of plates and stiffened panels are moving towards the ultimate limit states in recent decades, as is required by the new reliabilitybased design formulations (Guedes Soares et al. 1996).
Article Highlights • Ultimate compressive strength of aluminium plates and stiffened panels are reviewed. • The effect of boundary condition, initial imperfection, welding-induced residual stress and heat-affected zone are discussed. • The effect of manufacturing technology is analysed. * Bin Liu [email protected] 1
Green & Smart River-Sea-Going Ship, Cruise and Yacht Research Centre, Wuhan University of Technology, Wuhan 430063, China
2
Faculty of Shipbuilding, Vietnam Maritime University, Haiphong, Vietnam
3
Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal
Nowadays, aluminium alloys are widely used in building hulls and superstructures of high-speed vessels instead of steels due to their high strength and lower weight (Aalberg et al. 2001; Kasten 2016; Liu et al. 2019). In aluminium stiffened plates, fabricated by fusion welding, the material softening takes place in the heat-affected zone (HAZ) along the weld seam. In contrast to the steel stiffened panel, the yield stress in the HAZ of the welded aluminium panel is reduced significantly as compared with the base material. Hence, this leads to the reduction of the compressive ultimate strength of aluminium panels. The tensile residual stresses exist in the HAZ, which are self-equilibrated by the corresponding compressive stresses in the adjacent zones. The welding-induced residual stre
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