Enhancement of Structural Redundancy of Hull Structure in Accidental Condition by Applying Highly Ductile Steel

Volume 3: Structures, Safety, and Reliability Pub Date : 2019-06-09 DOI:10.1115/omae2019-95912

Shin Nakayama, Ueda Keiji, M. Aoki, Kazuyuki Matsumoto

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Abstract

Application of steel plates with highly ductile is beneficial for ship owners, in order to improve structural redundancy and prevent environmental burden in accidental condition such as collision or grounding. Highly ductile steel, in which breaking strain is improved by 20% in comparison with conventional steels has developed, by optimizing microstructure. Excellent ductility was achieved selecting ferrite-perlite dual phase structure of ferrite phase which is advantageous for stable actual production. Morphology of ferrite phase control which consists of optimization of volume fraction and strengthening of ferrite phase itself by adding Si plays an important role to enhance ductility. The highly ductile steel of YP315 grade had acquired Class approval, and for ships to which high ductile steels are applied, ClassNK would assign the notation “Hull Protection by Highly Ductile Steel” (HP-HDS). MITSUBISHI SHIPBUILDING has evaluated the effect of highly ductile steel by numerical simulation for LPG (Liquefied Petroleum Gas) Carrier owned by Astomos Energy Corporation and Iino Kaiun Kaisha, Ltd. It has been confirmed that highly ductile steel can improve the structural redundancy by 20% in accidental condition by being applying to side structure.

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应用高韧性钢增强意外工况下船体结构冗余度

采用高延展性钢板有利于船东提高结构冗余度，防止碰撞或搁浅等意外情况下的环境负担。通过优化显微组织，开发出了高韧性钢，其断裂应变比常规钢提高了20%。选用铁素体-珍珠岩双相结构的铁素体相具有良好的延展性，有利于实际生产的稳定。控制铁素体相的形貌，包括优化铁素体的体积分数和添加Si对铁素体相本身的强化，对提高塑性具有重要作用。YP315级高韧性钢已获得船级社认可，对于采用高韧性钢的船舶，船级社将授予“高韧性钢船体防护”(HP-HDS)标志。三菱造船对Astomos能源公司和Iino Kaiun Kaisha有限公司旗下的LPG(液化石油气)运输船进行了数值模拟，评估了高韧性钢的效果。高韧性钢应用于侧面结构，在意外工况下可使结构冗余度提高20%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Volume 3: Structures, Safety, and Reliability

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