船体用耐疲労鋼を用いた局部構造の疲労寿命に関する一考察

概要

論文の詳細を見る
To prevent fatigue problems is one of the most important themes in order to improve integrity of the hull steel structures up to now, and it has been depend on reduction of fluctuation stress at the concerned point. Authors developed new functional steel plate with superior resistance against fatigue crack growth, and it proposed that fatigue strength could be improved from a material side. Moreover, actual ship application was performed with LPGC, which was constructed by Mitsubishi Heavy Industries, Ltd. A part of the conventional steel plate was replaced with the developed one for the purpose of more high reliability on fatigue strength. This report shows quantitative comparison of calculated fatigue crack propagation life between the conventional steel plate and the developed steel plate for the following structure. ・VLCC's side longitudinal stiffener connection in way of transverse web frame ・LPGC's slot for bottom longitudinal stiffener in double bottom floor. ・PCC's opening corner in deep web section In addition, the calculation result which supposes fatigue property of the developed steel had become equal to the conventional one by heat affect with welding.
社団法人日本船舶海洋工学会の論文
2005-03-20