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Potential and Anisotropy of Material Effects on Corrosion Fatigue Crack Growth Characteristics under Mixed Mode Loading

Research Project

Project/Area Number 62550055
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 機械材料工学
Research InstitutionNagoya University

Principal Investigator

MORI Kaname  Nagoya University, School of Engineering, Asistant Professor, 工学部, 講師 (70023207)

Co-Investigator(Kenkyū-buntansha) OTSUKA Akio  Nagoya University, School of Engineering, Professor, 工学部, 教授 (60022993)
TOHGO Keiichiro  Nagoya University, School of Engineering, Reseach Associate, 工学部, 助手 (10155492)
Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1988: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1987: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsAluminum Alloy / Corrosion Fatigue / Crack Growth / Mixed Mode / Potential / Anisotropy / Mode I Growth / Mode II Growth / カソード防食 / モードI / モードII
Research Abstract

The characteristics of fatigue crack gtowth of a high strength aluminum alloy(7075-T6,rolled plate) under mode I and mixed mode (mode I static and mode II cyclic) loading have been investigated in air and in 3.5% saltwater using both the specimens extructed in LT and TL directions. The testing in saltwater was made under the free corrosion and the application of anodic and cathodic potentials.
The results for mode I crack growth showed that the crack growth ratge in saltwater was higher than that in air under all the conditions tested, regardless of the applied potentials and the specimen orientation. Although appreciable affect of the applied potential was observed in the lower K_I range in da-dn- K_I relations for LT specimen, almost no effect of potential was observed in both the da/dN- K_I relations for TL specimen and the da/dN- K_<LEFF> relations for LT and TL specimen.
The anisotropy of rolled plate for mode II growth under mixed mode loading was found. That is, the crack growth rates in saltwater under potentials were higher than that in air, in the higher K_<II> range, in da/dN- K_<II> relations for LT specimen. On the other hand, almost no effect of corrosion and potential was observed in da/dN- K_<II> relations for TL specimen.

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 森要、大塚昭夫: 機械学会論文集(A編). 55. 186-191 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 森要、大塚昭夫: (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 森要、大塚昭夫: (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Kaname Mori: "Fatigue Crack Growth Characteristics of Four 50 kgf/mm^2 TMCP Steels and their Weld-Heat-Affected-Zone in Synthetic Sea Water at a Frequency of 0.17 Hz" Transactions of the Japan Society of Mechanical Engineers (Series A). 55. 186-191 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Kaname Mori: "Potential and Anisotropy of Material Effects on Fatigue Crack Growth Characteristics in 7075-T6 Aluminum Alloy in 3.5% Saltwater" Journal of the Society of Materials Science, Japan. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Kaname Mori: "Potential and Anisotropy of Material Effects on Mode II Fatigue Crack Growth Characteristics under Mixed Mode Loading in 7075-T6 Aluminum Alloy in 3.5% Saltwater" Journal of the Society of Materials Science, Japan. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 森要、大塚昭夫: 機械学会論文集(A編). 55. 186-191 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 森要、大塚昭夫: 材料投稿中. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 森要、大塚昭夫: 材料. (1990)

    • Related Report
      1988 Annual Research Report
  • [Publications] 森要: 材料学会第37期総会学術講演会前刷り. (1988)

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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