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Methods of Inspection and Quantitative Evaluation of Creep-Fatigue Small Cracks at Elevated Temperature

Research Project

Project/Area Number 61460089
Research Category

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

Allocation TypeSingle-year Grants
Research Field 材料力学
Research InstitutionKyoto University

Principal Investigator

OHTANI Ryuichi  Faculty of Engineering, Kyoto University, Professor, 工学部, 教授 (50025946)

Co-Investigator(Kenkyū-buntansha) KITAMURA Takayuki  Faculty of Engineering, Kyoto Iniversity, Instructor, 工学部, 助手 (20169882)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥5,800,000 (Direct Cost: ¥5,800,000)
Fiscal Year 1987: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1986: ¥3,800,000 (Direct Cost: ¥3,800,000)
KeywordsHigh-temperature strength / Creep-fatigue / Small crack / Inspection of cracks / Electric potential method / Fracture mechanics / モンテカルロシミュレーション / き裂の検出法 / 微小き裂伝ぱの定量評価法 / ステンレス鋼
Research Abstract

1. Fot the purpose of investigating the crack propagation behavior in thermal fatigue, crack propagation tests of varying temperature fatigue and of creep under stress relaxation conditions were conducted.
2. Two types of LCF life laws were derived from the two types of crack propagation equations based on nonlinear fracture mechanics at elevated temperature.
3. The mechanism and mechanics of creep-fatigue interaction in the crack propagation process were verified using high-sensitivity electric potential methods.
4. Relationships between surface crack dimension and electric potential drop were obtained using wood metal plates and glass-made cracks of several kinds of shape.
5. Measurements of the number and the length of small surface cracks of 304 stainless steel were done by means of image analysis, and the behavior of small crack initiation and early growth were observed continuously during creep-fatigue tests with a thigh-temperature microscope.
6. Based on the above results, stochastic models of crack initiaction adn propagation in creep and creep-fatigue were developed. In order to deal with the scatter of small crack initiation time and propagation rate caused by microstructural inhomogeneity, a random variable technic was used in the models. Numerical simulation was conducted by Monte Carlo method.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (33 results)

All Other

All Publications (33 results)

  • [Publications] Ryuichi Ohtani: Proceedings of the International Conference on Creep. JSME. IMechE. ASME. ASTM. 167-172 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 大谷隆一: 鉄と鋼. 72. 711-719 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 大谷隆一: 日本機械学会論文集(A編). 52. 1461-1468 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 北村隆行: 日本機械学会論文集(A編). 52. 1816-1823 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 大谷隆一: 日本機械学会論文集(A編). 52. 1824-1830 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ryuishi Ohtani: Proceedings of the 5th International Conference on Mechanical Behavior of Materials. Pergamon. 2. 1101-1108 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 北村隆行: 日本機械学会論文集(A編). 53. 1064-1070 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 大谷隆一: 材料. 36. 974-976 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ryuichi Ohtani: Proceedings of the 2nd International Conference on Low Cycie Fatigue, Elsevire. 221-222 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 栗山義英: 日本材料学会第25回高温強度シンポジウム前刷集. 117-121 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ryuichi Ohtani: ASTM STP 942, ″Low Cycle Fatigue″. 1163-1180 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 大谷隆一: 日本機械学会第63期通常総会講演会(昭和63年3月31日).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ryuichi Ohtani: "A Concept of Life and Remaining Life Prediction of High Temperature Structural Materials Based on the Characteristics of Creep-Fatigue Crack Propagation (in Japanese)" Journal of the Iron and Steel Institute of Japan. 72. 711-719 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Takayuki Kitamura: "Crack Propagation under Creep-Fatigue Interaction Condition (in Japanses)" Trans. JSME, Ser.A. 52. 1816-1823 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ryuichi Ohtani: "Small Crack Propagation in High Temperature Creep-Fatigue of 304 Stainless Steel (in Japanese)" Trans. JSME, Ser.A. 52. 1824-1830 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ryuichi Ohtani: "Crack Propagation of Varying-Temperature Low-Cycle Fatigue Simulating Thermal Fatigue" Proc. 5th International Conference on Mechanical Behavior of Materials, Beijing, Pergamon. 2. 1101-1108 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Takayuki Kitamura: "Numerical Simulation of Microstructurally-Short-Crack Propagation in Creep" JSME International Journal. 30. 1741-1749 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ryuichi Ohtani: "Observation of Initiation and Early Growth of Small Cracks during High-Temperature Low-Cycle Fatigue in 304 Stainless Steel (in Japanese)" Journal of the Society of Materials Science. 36. 974-979 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ryuichi Ohtani: "Substance of Creep-Fatigue Interaction Examined from the Point of View of a Crack Propagation Mechanics" Proc. 2nd International Conference on Low Cycle Fatigue, Munchen, Elsevire. 211-222 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yoshihide Kuriyama: "The Measurement of Creep-Fatigue Small Cracks on the surface of Smooth Specimens by Image Analysis (in Japanese)" Preprint of 25th Symposium oh High Temperature Strength of Materials, Society of Materials Science, Japan. 117-121 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ryuichi Ohtani: "High-Temperature Low Cycle Fatigue Crack Propagation and Life Laws of Smooth Specimens Derived from the Crack propagation Laws" ASTM STP 942, "Low Cycle Fatigue". 1163-1180 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ryuichi Ohtani: "Simulation of Initiation and Early Propagation of Creep-Fatigue Small Cracks based on the Model of Random Fracture Resistance of Grain Boundaries" Trans. JSME, Ser.A.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 大谷隆一: 鉄と鋼. 72. 711-719 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 大谷隆一: 日本機械学会論文集(A編). 52. 1461-1468 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] Ryuichi Ohtani: Proceedings of International Conference on Creep,JSME. 167-172 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 北村隆行: 日本機械学会論文集(A編). 52. 1816-1823 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 大谷隆一: 日本機械学会論文集(A編). 52. 1824-1830 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] Ryuichi Ohtani: Proceedings of International Conference on Rule of Fracture Mechanics in Modern Technology.

    • Related Report
      1986 Annual Research Report
  • [Publications] 北村隆行: 日本機械学会 講演概要集 日本機械学会論文集(A編). No.874-1. 41 (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] 大谷隆一: 第24回高温強度シンポジウム前刷集(材料学会). 56-60 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 大谷隆一: 第24回高温強度シンポジウム前刷集(材料学会). 71-75 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] Ryuichi Ohtani: Proceedings of 5th International Conference on Mechanical Behavior of Materials,China. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] Ryuichi Ohtani: Proceedings of 2nd Inter.Conf.on Low-Cycle Fatigue,Munich.

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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