チタン製防撓板の座屈崩壊強度

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Titanium is a suitable material for hull structures because of its high specific strength and high corrosion resistance in marine environment. Recently titanium was used for the structural members of a fishing boat, because its structural standard is not strict. However, there is no application of titanium for merchant and government ships. Additionally, there is little research concerned with the buckling strength or the fatigue strength of titanium. By the way, aluminium alloy is applied for new types of light weighted high-speed ships. There have been much outcome about the strength of aluminium alloy, and authors also studied experimentally the buckling strength of pi-sections and hollow sections. As a result, it was turned out that the buckling strength of the stiffened plates made of aluminium alloy was reduced by the formation of the softened zone by welding. In this study, it is a purpose to confirm the advantage of application of titanium for the hull structures. Therefore, the buckling strength of titanium stiffened plates and the distribution of the residual stress of deck plate and stiffeners were studied experimentally. Four types of stiffened plate model with three spans and three bays were provided for compressive collapse tests. As a basis of the test results, the simplified analysis for evaluating the ultimate strength was suggested. All the models collapsed in overall bucking mode. That is, the torsional rigidity of stiffeners was excess and the ratio of rigidity between deck plates and stiffeners were not appropriate. If the ratio of rigidity is more effective, the increase of the ultimate compressive stress is expected. Moreover, the ultimate strength from the buckling tests was in good agreement with that of the simplified analyses and the FEM analyses. According to the results above mentioned, the maximum compressive stress of titanium stiffened plates is much higher than that of aluminium alloys and the superiority of titanium was shown.
独立行政法人海上技術安全研究所の論文
2003-09-26

チタン製防撓板の座屈崩壊強度

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