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Study on the mechanism of cumulative fatigue damage of advanced engineering materials under service loadings

Research Project

Project/Area Number 06452149
Research Category

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

Allocation TypeSingle-year Grants
Research Field Materials/Mechanics of materials
Research InstitutionOsaka University

Principal Investigator

JONO Masahiro  Osaka univ., Faculty of Engineering, Professor, 工学部, 教授 (20029094)

Co-Investigator(Kenkyū-buntansha) SUGETA Atsushi  Osaka Univ., Faculty of Engineering, Associate Professor, 光学部, 助教授 (60162913)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥6,800,000 (Direct Cost: ¥6,800,000)
Fiscal Year 1995: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1994: ¥4,800,000 (Direct Cost: ¥4,800,000)
KeywordsAdvanced Engineering Material / Ceramics / Metal Matrix Composites / Service Loading / Fatigue Strength / Fatigue Crack Growth / Direct Observation / Image Processing
Research Abstract

In this project, fatigue crack initiation and propagation behavior undre constant and variable amplitude loadings were investigated on advanced engineering materials such as titanium alloys, powder metallurgy (P/M) aluminum alloys, metal matrix composites (MMC) and ceramics.
Crack opening behavior of titanium alloys under variable amplitude loadings was found to depend on the microstructure of materials, which resulted in the different crack growth rates against the identical stress intensity factor depending on the materials. Acceleration of crack growth by load reduction was observed for the small fatigue cracks, while retardation was found for conventional long fatigue cracks on the titanium alloys as well as high strength structural steels.
As to the SiC reinforced aluminum matrix composites, i.e.SiC particle reinforced P/M composite and SiC whisker reinforced casting composite, fatigue crack initiation and growth mechanisms were found to be defferent depending on the geometry of SiC and production processes. A fatigue crack initiated in the vicinity of SiC particle in the P/M composite and a single or a few cracks propagated until fracture. On the other hands, in the casting composite, fatigue cracks easily initiated at the whisker/matrix interfaces or at the sites where SiC whisker was pulled out and some microcracks were found to coalesce to form a main crack. Furthermore, SiC reinforcement irrespective of particle or whisker was found to be benefit for fatigue characteristics of MMC due to the increase of fatigue crack growth resistance.
Through the direct observation of fatigue crack growth behavior under a single overload on a 3% silicon iron, it was found that the retardation behavior was closely correlated with deflected or branched cracks.
Finally, crack growth acceleration under repeated two step loadings was found on a sintered silicon nitride, to the contrary of the retardation behavior usually observed on the metallic materials.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] 菅田 淳: "窒化けい素における2段繰返し変動荷重下の疲労き裂進展挙動" 日本材料学会第44期学術講演会講演論文集. 1251-1257 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 菅田 淳: "変動荷重下の疲労き裂進展挙動の動的直接観察および画像処理解析" 日本機械学会第74期全国大会講演論文集. 95-10. 356-357 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Masahiro Jono: "Fatigue Crack Initiation and Growth Mechanisms in Particle-Reinforced Aluminum Matrix Composites" Materials Science Research International. 1. 175-180 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 城野政弘: "SiCウィスカ強化Al基複合材料の表面微小疲労き裂の発生および初期進展挙動" 日本機械学会関西支部第71期定期総会講演会論文集. 964-1. 657-658 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 城野政弘: "Al-8Fe粉末鍛造合金の表面微小疲労き裂の発生および初期進展挙動" 日本機械学会関西支部第71期定時総会講演会論文集. 964-1. 659-660 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 菅田 淳: "SiC粒子強化アルミニウム基複合材料の表面微小疲労き裂の発生および初期進展挙動" 材料. 45. (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Jono and A.Sugeta: "Fatigue Crack Initiation and growth Mechanisms in Particle-Reinforced Aluminum matrix Composites" Mat r.Sci.Res.Int.(Sept.). 1-3 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Sugeta and M.Jono: "Fatigue Crack Initiation and Growth Mechanisms in Particle-Reinforced Aluminum Matrix Composites" ICM-7. 229-231 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Jono and A.sugeta: "Crack Closure and Effect of Load Variation on Small Fatigue Crack Growth Behavior" Int.J.Fatigue Fract.Engng.Mater.Vol, 19, No.2 (to be published).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] A.Sugeta, M.Jono, K.Bessho and A.Sakaguti: "Initiation and Crack Growth of Small Surface Fatigue Crack in SiC particle reinforced Aluminum Matrix Composite" J.The Society of Materials Science Japan. 45. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] A.Sugeta and M.Jono: "Fatigue Crack Growth Behavior under Variable Amplitude Loadings in Sintered Silicone Nitride" Fatigue '96. (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 菅田 淳: "窒化けい素における2段繰返し変動荷重下の疲労き裂進展挙動" 日本材料学会第44期学術講演会講演論文集. 1251-1257 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 菅田 淳: "変動荷重下の疲労き裂進展挙動の動的直接観察および画像処理解析" 日本機械学会第74期全国大会講演論文集. 95-10. 356-357 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Masahiro Jono: "Fatigue Crack Initiation and Growth Mechanisms in Particle-Reinforced Aluminum Matrix Composites" Materials Science Research International. 1. 175-180 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 城野政弘: "SiCウィスカ強化Al基複合材料の表面微小疲労き裂の発生および初期進展挙動" 日本機械学会関西支部第71期定時総会講演会論文集. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 城野政弘: "Al-8Fe粉末鍛造合金の表面微小疲労き裂の発生および初期進展挙動" 日本機械学会関西支部第71期定時総会講演会論文集. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 菅田 淳: "SiC粒子強化アルミニウム基複合材料の表面微小疲労き裂の発生および初期進展挙動" 材料. 45. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 菅田淳: "Al-15Zn粉末冶金合金における表面微小疲労き裂の発生および進展挙動" 材料. 43巻. 1251-1257 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 城野政弘: "SiC粒子強化アルミニウム基複合材料における表面微小疲労き裂の発生および進展挙動" 日本材料学会第43期学術講演会講演論文集. 169-170 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 菅田淳: "窒化けい素における変動荷重下の疲労き裂進展挙動" 日本材料学会第22回疲労シンポジウム講演論文集. 41-44 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 菅田淳: "直接観察と画像処理による変動荷重下の疲労き裂進展機構の研究" 日本機械学会 材料と構造物の強度と破壊シンポジウム 講演論文集. 126-133 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 城野政弘: "変動荷重下の疲労き裂進展挙動の動的直接観察と画像処理解析" 日本機械学会関西支部第70期定時総会講演会論文集. 954-1. (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 城野政弘: "Ti-6Al-4V合金における2段繰返し変動荷重下のき裂開閉口挙動と疲労き裂進展特性" 日本機械学会関西支部第70期定時総会講演会論文集. 954-1. (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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