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Remaining life assessment method of fatigue crack propagation in a double hull ship structure

Research Project

Project/Area Number 10555338
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section展開研究
Research Field 船舶工学
Research InstitutionYokohama National University

Principal Investigator

SUMI Yoichi  Yokohama National University, Faculty of Engineering, Professor, 工学部, 教授 (80107367)

Co-Investigator(Kenkyū-buntansha) IYAMA Hisashi  Yokohama National University, Faculty of Engineering, Research Assistant, 工学部, 助手 (90013698)
KAWAMURA Yasumi  Yokohama National University, Graduate School of Engineering, Associate Professor, 工学研究科, 助教授 (50262407)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥13,100,000 (Direct Cost: ¥13,100,000)
Fiscal Year 2000: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1999: ¥6,800,000 (Direct Cost: ¥6,800,000)
Fiscal Year 1998: ¥3,500,000 (Direct Cost: ¥3,500,000)
Keywordsdouble hull / ship strength / fatigue crack / fracture mechanics / stress intensity factor / weight function / remaining life assessment / 余寿命 / き裂伝播
Research Abstract

The fitness for serviceability of structural members of ships, in which fatigue cracks could be found during in-service inspection, is investigated in order to prevent instantaneous failures of ships as well as the loss of serviceability such as oil and/or water tightness of critical compartments. The characteristics of fatigue crack propagation and the remaining life assessment of double hull ship structures are discussed.
A finite element comparative study of ship structural detail has been carried out in order to examine the possible variations of calculated local stress by practitioners. It is found that the results of shell element models have high correlation with each other, but give significantly lower local stress than experimental and solid element results. With regard to the analysis of 3-D cracks, a new combined numerical and analytical weight function method is proposed for the determination of stress intensity factors in ship structural details, which is proved to be a ver … More y efficient method for fatigue crack analysis. Discussions are also made for an advanced numerical simulation method for the remaining life assessment, in which the effects of welding residual stresses, structural redundancy, and curved crack propagation are precisely taken into account. The simulated crack paths and the fatigue crack propagation lives are in fairly good agreement with the experimental results.
The fatigue remaining life assessment is demonstrated for cracks detected in the critical parts of the inner bottom plate of a double bottom structure, where the remaining life is calculated based on the fracture mechanics approach. The paving method and the domain composition method are implemented for the efficient and robust finite element mesh generation which is essential for fatigue strength analysis and fatigue crack propagation analyis. Also, an advanced computational method has been developed for the prediction of curved crack growth. A concept of the information system for damages of ship structures is proposed for the improved safety and maintenance of ships in service. Less

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (33 results)

All Other

All Publications (33 results)

  • [Publications] Y.Sumi and Y.Mu: "Thermally induced quasi-static wavy crack propagation on a brittle solid"Mechanics of Materials. 32. 531-542 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 角洋一 ほか3名: "数値重み関数による3次元き裂解析の定式化"日本造船学会論文集. 188. 655-660 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 川村恭己 ほか2名: "携帯型船体検査支援システムに関する研究"日本造船学会論文集. 188. 737-743 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 角洋一,沐陽: "冷却熱応力によるぜい性き裂の蛇行とその伝播形態について"日本機械学会論文集 A編. 66-642. 361-368 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Kawamura et al.: "Development of an automatic quadiclateral much generator for the silumation of curwed crack growth"Trans.Japan Soc.Computational Enjoy.Sci.. 2. 1-6 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 川村恭己 ほか3名: "領域合成法による有限要素解析手法の開発"日本造船学会論文集. 185. 187-195 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 川村恭己 ほか2名: "船体損傷情報システムに関する考察"日本造船学会論文集. 184. 527-536 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Iwahashi ほか8名: "Finite elemont comparative study of ship structural detail"Maime Structures. 11. 127-139 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Sumi: "Fatigue crack propagation and computational remaing life assessment"Journal of Mairne Science and Tech.. 3. 102-112 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Sumi and Z.N.Wang: "A finite-element simulation method for a system of growing cracks"Mech.of Materials. 28. 197-206 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Ohtsubo and Y.Sumi (ed.): "Proceedings of the 14th Int.Ship ard Offshore Structures Congress, Vol.2"Elsevier.Oxford. 918 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Ohtsubo and Y.Sumi (ed.): "Proceedings of the 14th Int.Ship and Offshore Structures Congress, Vol.3"Elsevier, Oxford. 350 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Sumi and Y.Mu: "Thermally induced quasi-static wavy crack propagation in a brittle solid"Mechanics of Materials. 32. 531-542 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Sumi, T.Kashiuchi, K.Ito, and A.Okura: "Efficient analyses of 3-dimensional cracks subjected to arbitrary loadings by numerical weight function method"Journal of the Society of Naval Architects of Japan. 188. 655-660 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Kawamura, T.Sakuragi, and Y.Sumi: "A study on a ship inspection supporting system by using a portable computer"Journal of the Society of Naval Architects of Japan. 188. 737-743 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Sumi and Y.Mu: "Morphological aspects of thermally induced wavy cracks in a brittle solid"Journal of the Japan Society of Mechanical Engineers. 66-642. 361-368 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Kawamura, Y.Mu, and Y.Sumi: "Development of an automatic quadrilateral mesh generator for the simulation of curved crack growth"Transactions of the Japan Society for Computational Engineering and Science. Paper No.19990024. 1-6 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Kawamura, Y.Sumi, A.Watanabe, and K.Hirota: "The finite element analysis with the domain composition method applied to linear elastostatics"Journal of the Society of Naval Architects of Japan. 185. 187-195 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Kawamura, Y.Sumi, and T.Seki: "A study on the information system for damages of ship structures"Journal of the Society of Naval Architects of Japan. 184. 527-536 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Iwahashi, Y.Sumi, T.Hu, H.Paetzold, C.C.Wu, C.D.Jang, P.Rigo, W.Nie, and H.Kawano: "Finite element comparative study of ship structural detail"Marine Structures. 11-4/5. 127-139 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Sumi: "Fatigue crack propagation and computational remaining life assessment of ship structures"Journal of Marine Science and Technology. 3-2. 102-112 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Sumi and Z.N.Wang: "A finite-element simulation method for a system of growing cracks in a heterogeneous material"Mechanics of Materials. 28. 197-206 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Ohtsubo and Y.Sumi (ed.): "Proceedings of the 14th International Ship and Offshore Structures Congress Vols.1 and 2"Elsevier, Oxford. 918 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Ohtsubo and Y.Sumi (ed.): "Proceedings of the, 14th International Ship and Offshore Structures Congress"Elsevier, Oxford (in press). 343 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Sumi and Y.Mu: "Thermally induced quasi-static wavy crack propagation in a brittle solid"Mechanics of Materials. 32. 531-542 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 角洋一 ほか3名: "数値重み関数による3次元き裂解析の定式化"日本造船学会論文集. 188. 655-660 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 川村恭己 ほか2名: "携帯型船体検査支援システムに関する研究"日本造船学会論文集. 188. 737-743 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 川村,角,渡辺,広田: "領域合成法による有限要素解析手法の開発"日本造船学会論文集. 184. 187-195 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kawamura Y.,Mu Y. and Sumi Y.: "Development of an automatic quadrilateral mesh generater for the simulation of curved crack growth"Trans. JSCES. 24. 1-6 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 角,沐: "冷却熱応力によるき裂の蛇行とその伝播形態について"日本機械学会論文集. 66-A642(印刷中). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Sumi: "Fatigue crack propagation and computational remaining life assessment of ship structures" Journal of Marine Science and Technology. 3-2. 102-112 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Iwahashi: "Finite element comparative study of ship structural detail" Marine Structures. 11-4・5. 127-139 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 川村 恭己: "船体損傷情報システムに関する研究" 日本造船学会論文集. 184. 527-536 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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