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Improvement of Random Fatigue Life Prediction in terms of Actual Fatigue Process-Oriented Fatigue Damage Counting Method

Research Project

Project/Area Number 06555030
Research Category

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

Allocation TypeSingle-year Grants
Research Field Materials/Mechanics of materials
Research InstitutionKyushu Institute of Technology

Principal Investigator

HARADA Shoji  Kyushu Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (80029199)

Co-Investigator(Kenkyū-buntansha) FUKUSHIMA Yoshihiro  Kyushu Institute of Technology, Faculty of Engineering, Research Assistant, 工学部, 助手 (40156774)
KUROSHIMA Yoshihito  Kyushu Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (50253547)
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: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1994: ¥6,300,000 (Direct Cost: ¥6,300,000)
KeywordsRandom Loading / Fatigue Life / Small Crack Growth / Crack Tip Opening Displacement / Rain Flow Method / ランダム疲労 / 変動応力 / 過小応力 / き裂伝ぱ / き裂開閉口 / 疲労寿命予測
Research Abstract

To establish highly reliable fatigue life prediction method under random loading the rain flow method(RFM), originally developed as one of the most useful fatigue damage counting method, was re-interpreted by taking into account the actual fatigue process of crack initiation and propagation. Incounting fatigue damage, either cyclic plastic strain(LCF)or cyclic stress amplitude(HCF)has been used so far. Through the fatigue tests in wide fatigue region, CTOD was found to be a most suitable parameter in estimating fatigue damage. In case of LCF loading, the relationship between CTOD and the small crack growth rate corresponds fairly well to the relationship between the equivalent plastic strain and the small crack growth rate. On the other hand, the presence of the crack closure effect in HCF loading resulted in losing one-to-one correspondence found in LCF loading. This means, the crack growth rate should be estimated by using parameters DELTACTOD and DELTAKeff.

Report

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

    (15 results)

All Other

All Publications (15 results)

  • [Publications] 三宅正浩: "微小き裂発生・伝ぱに基づくランダム荷重下の疲労損傷評価" 日本機械学会第72期全国大会講演論文集(I). 940-30. 235-237 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 三宅正浩: "き裂開閉口変位による変動荷重疲労損傷評価" 日本機械学会第72期通常総会講演会講演論文集(II). 95-1. 346-347 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 三宅正浩: "変動荷重下におけるき裂発生寿命評価" 日本機械学会第73期全国大会講演論文集(I). 95-10. 266-267 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 三宅正浩: "変動荷重下の低サイクル疲労き裂進展評価パラメータについて" 日本機械学会第73期通常総会講演会にて発表予定. (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Masahiro Miyake: "Growth Rate and Closure of Fatigue Cracks under High-Cycle Fatigue Random Loading" LOCALISED DAMAGE 96にて発表予定. (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Masahiro Miyake, Yoshihito Kuroshima, Shoji Harada and Masao Takahara: "Small Crack Growth-Oriented Fatigue Damage Evaluation under Random Loading" Proceedings of the 72nd JSME Fall Annual Meeting. Vol.I,No.940-30. 235-237 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Masahiro Miyake, Yoshihito Kuroshima and Shoji Harada: "Evaluation of High Cycle Fatigue Damage by the CTOD under Random Loading" Proceedings of the 72nd JSME Spring Annual Meeting. Vol.II,No.95-1. 346-347 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Masahiro Miyake, Yoshihito Kuroshima and Shoji Harada: "Evaluation of Fatigue Crack Initiation Life under Random Loading" Proceedings of the 73rd JSME Fall Annual Meeting. Vol.I,No.95-10. 266-267 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Masahiro Miyake, Yoshihito Kuroshima, Shoji Harada and Masao Takahara: "Low cycle fatigue about fracture mechanics parameter under random loading" the 73rd JSME Spring Annual Meeting. (To appear).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Masahiro Miyake, Yoshihito Kuroshima, Shoji Harada and Masao Takahara: "Growth Rate and Closure of Fatigue Cracks under High-Cycle Fatigue Random Loading" LOCALISED DAMAGE96. (To appear).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 三宅正浩: "微小き裂発生・伝ぱに基づくランダム荷重下の疲労損傷評価" 日本機械学会第72期全国大会講演論文集(I). 940-30. 235-237 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] 三宅正浩: "き裂開閉口変位による変動荷重疲労損傷評価" 日本機械学会第72期通常総会講演会講演論文集(II). 95-1. 346-347 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 三宅正浩: "変動荷重下におけるき裂発生寿命評価" 日本機械学会第73期全国大会講演論文集(I). 95-10. 266-267 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 原田 昭治他2名: "き裂発生・伝ぱに基づくランダム荷重下の疲労被害評価" 第72期全国大会 講演論文集. VoL.I. 235-237 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 原田 昭治他2名: "き裂開閉口変位による変動荷重疲労損傷評価" 第72期通常総会 講演論文集. (発表予定).

    • Related Report
      1994 Annual Research Report

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

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