Thickness Effect on the Brittle Crack Arrest Toughness Value (K_<ca>) : Brittle Crack Arrest Design for Large Container Ships-6

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概要

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• Brittle fracture of the hull structure has the possibility to cause serious structural damage and so it should be avoided. Therefore, it is important to ensure hull structural integrity by preventing brittle cracks from being initiated and also by providing a proper means for arresting a brittle crack when the crack propagation occurs. In the last 4 papers of ISOPE 2010, the authors investigated a proper brittle crack arrest design for large container carriers by carrying out a number of large-scale and middle-scale fracture tests. As a result, it was concluded that the required brittle crack arrest toughness value K_<ca> should be more than 6,000N/mm^<3/2> to arrest brittle cracks in thick steel plates exceeding 50mm. The issue of the plate thickness effect on the required K_<ca> has become a key concern with regards to the applicability of the proposed K_<ca>. Since 2009, the authors conducted ultra-wide duplex ESSO tests with plate thickness from 25mm to 75mm, which had no structural influences on the test results, in order to investigate the thickness effect on the required K_<ca> value. As a result, it was confirmed that plate thickness affects the required K_<ca> value.

• 一般財団法人日本海事協会の論文

著者

• Yajima Hiroshi

  Nagasaki Inst. Of Ap. Sc.

• YOSHINARI Hitoshi

  National Research Institute for Metals

• Inoue Takehiro

  Nippon Steel Corporation

• Aihara Shuji

  The University of Tokyo

• Toyoda Masanobu

  IHI Marine United Inc.

• Handa Tsunehisa

  JFE Steel Corporation

• Tani Tokutaka

  Kobe Steel Ltd.

• Hirota Kazuhiro

  Mitsubishi Heavy Industries Ltd.

• Kawabata Tomoya

  Sumitomo Metal Industries Ltd.

• Kiyosue Takaaki

  Kawasaki Heavy Industries Ltd.

• Sugimoto Kei

  Nippon Kaiji Kyokai(ClassNK)

• Usami Akio

  Nippon Kaiji Kyokai(ClassNK)

• Yoshinari Hitoshi

  National Maritime Research Institute

関連論文

• Evaluation Method of the Brittle Fracture Strength in Structurally Stress-Concentrated Regions
• 11. Evaluation Method of the Brittle Fracture Strength in Structurally Stress Concentrated Regions
• Effect of Fabricating Process on Notch Toughness of Shipbuilding Steel Plates (Report II) : Superposition of Welding on Cold Work and Its Effect on Brittle Fracture Strength
• 7. Effect of Line-Heating on Notch Toughness of 50 kg/mm^2-Class High-Tensile Steel Plates
• Effect of Fabricating Process on Notch Toughness of Shipbuilding Steel Plates (Report I) : Effect of Line-Heating on Notch Toughness of 50 kg/mm^2-Class High-Tensile Steel Plates
• Effect of Structural Discontinuities of Welded Joints on Brittle Crack Propagation Behavior : Brittle Crack Arrest Design for Large Container Ships-3
• Near-Threshold Fatigue Crack Propagation in Welded Joints under Random Loadings
• Development of Brittle Crack Arrest Toughness K_ Test Method : Brittle Crack Arrest Design for Large Container Ships-2
• Required Brittle Crack Arrest Toughness K_ Value with Actual Scale Model Tests : Brittle Crack Arrest Design for Large Container Ships-4
• Development of Guidelines on Brittle Crack Arrest Design : Brittle Crack Arrest Design for Large Container Ships-1
• Thickness Effect on Brittle Fracture Toughness of Weld Metal of High Tensile Strength Steel
• 16. Study on Brittle Crack Propagation and Arrest Behavior in Plate and Beam Structures
• Improvement of fatigue properties by ultrafine grained microstructure in steel plate
• 13. Study on Brittle Crack Propagation and Arrest Behavior in Plate and Beam Structures (2nd Report) : Dynamic Fracture Toughness of Ship Hull Steels
• Experimental Study on Brittle Crack Propagation Behavior with Large Scale Structural Component Model Tests : Brittle Crack Arrest Design for Large Container Ships-5
• Thickness Effect on the Brittle Crack Arrest Toughness Value (K_) : Brittle Crack Arrest Design for Large Container Ships-6

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