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Study on Behavior of Micro crack and Propagation Characteristic of Mild Steels in Corrosive Environment

Research Project

Project/Area Number 06650529
Research Category

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

Allocation TypeSingle-year Grants
Research Field 構造工学・地震工学
Research InstitutionDaido Institute of Technology

Principal Investigator

KOTOGUCHI Hisao  Daido Institute of Technology, Civil Engineering, Professor, 工学部, 教授 (60047305)

Co-Investigator(Kenkyū-buntansha) MIKI Toshihiro  Daido Institute of Technology, Civil Engineering, Associate Professor, 工学部, 助教授 (90137175)
MIZUSAWA Tomisaku  Daido Institute of Technology, Civil Engineering, Professor, 工学部, 教授 (60113081)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1995: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1994: ¥800,000 (Direct Cost: ¥800,000)
KeywordsFatigue / Corrosive Fatigue / Microcrack / Occurrence of Crack / Fracture Mechanics / Stress Intensity Factor / Process Zone / Crack Propagation
Research Abstract

1. Multiple initial cracks initiate and one of these cracks that has most developed process zone has microcrack. Microcrack propagated along the grain boundary.
2. In the behavior of microcrack propagation, there were three steps. In the first step, process zones 1 the crack propagated along the grain boundary in zigzag direction, near the root of two process zones. microcrack stopped propagating until growing of new process zone. Microcrack propagated by the this behavior.
It has been able to estimate relationship between microcrack growth rate and stress intensity factor has found to propagate when K is less than its lower limit of long crack that is general consideratic crack growth rate in microcrack decreased in accordance with an increase of stress intensity factor.
4. Behavior of crack opening and closure was found to occur even in microcrack.
Fractogragrapy of corrosive and atmospheric fatigue crack are permed by scanning electron microsc clear the difference in two types environments.

Report

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

    (28 results)

All Other

All Publications (28 results)

  • [Publications] 事口 壽男,他: "鋼の微視き裂進展挙動の動的観察" 日本鋼構造協会構造年次論文報告集. Vol.2. 495-500 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 事口 壽男,他: "Experimental Study on Microcrack Behavior of Mild Steel" Structural Steel 4th Pacific Stractural Steel Conference. Vol.1. 715-722 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 事口 壽男,他: "鋼の微視き裂発生機構に関する基礎実験" 土木学会年次学術講演会講演概要集. 第49回. 584-585 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 事口 壽男,他: "表面と内部の微視き裂進展挙動" 土木学会年次学術講演会講演概要集. 第50回. 376-377 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 事口 壽男,他: "鋼の微視き裂におけるノッチ角と深さのの影響" 土木学会年次学術講演会講演概要集. 第50回. 378-379 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 事口 壽男,他: "腐食環境下における微視き裂挙動に関する考察" 土木学会中部支部研究発表会講演概要集. I-11. 21-22 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 事口 壽男,他: "微視き裂における表面と内部のき裂進展挙動について" 土木学会中部支部研究発表会. I-32. 67-68 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 事口 壽男,他: "予き裂形状の差異による鋼の微視き裂進展挙動に関する研究" 土木学会中部支部研究発表会. I-33. 69-70 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 事口 壽男,他: "塩水環境下での繰り返し荷重による鋼の微視き裂挙動の実験的研究" 土木学会年次学術講演会講演概要集. 第51回. (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kotoguchi, T,Ito and T,Yamamori: "Dynamic Observation on Micro Crack Behavior of Steel" Journal of Construction Steel, JSSC. Vol.2. 495-500 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kotoguchi, T.Ito and H.Okamoto: "Experimental Study on Microcrack Behavior of Mild Steel" Pacific Structural Steel Conference, Singapore. Vol.4. 715-722 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kotoguchi, T.Ito and T.Yamamori: "Fundamental Study on Occurrence Organization of Steel Microcrack" Annual Meeting of JSCE. I-293. 584-585 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kotoguchi, H.Okamoto and T.Yamamori: "Microcrack Propagation of Mild Steel having Different Notched Shape" Annual Meeting of Tyubu Branch of JSCE. I-32. 69-70 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kotoguchi, T.Ito and T.Yamamori: "Microcrack Propagation Occurred in Surface and Inner of Mild Steel" Annual Meeting of Tyubu Branch of JSCE. I-31. 67-68 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kotoguchi, T.Ito and T.Yamamori: "Behavior on Surface and Inside Microcrack Growth of Steel" Annual Meeting of JSCE. I-293, I-A188. 376-377 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kotoguchi, H.Okamoto and T.Yamamori: "Influence of Microcrack Propagation under different Notched Shape and Depth" Anual Meeting of JSCE. I-293, I-A189. 378-379 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kotoguchi, H.Okamoto: "Study on Microcrack Propagation of Steel in Corrosive Environment" Annual Meeting of Tyubu Branch, JSCE. I-11. 21-22 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kotoguchi, H.Okamoto and T.Yamamori: "Exmental Study on Microcrack Propagation of Steel in Wet Corrosive Environment" Anual Meeting of JSCE,Sep., 1996. (received).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 事口 壽男: "鋼の微視き裂進展挙動の動的観察" 日本鋼構造協会構造年次論文報告集. Vol.2. 495-500 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] 事口 壽男: "Experimental Study on Microcrack Behavior of Mild Steel" Structural Steel 4th Pacific Stractural Steel Conference. Vol.1. 715-722 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 事口 壽男: "鋼の微視き裂発生機構に関する基礎実験" 土木学会年次学術講演会講演概要集. 第49回. 584-585 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] 事口 壽男: "表面と内部の微視き裂発展挙動" 土木学会年次学術講演会講演概要集. 第50回. 376-377 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 事口 壽男: "鋼の微視き裂におけるノッチ角と深さの影響" 土木学会年次学術講演会講演概要集. 第50回. 387-379 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 事口 壽男: "腐食環境下における微視き裂挙動に関する考察" 土木学会中部支部研究発表会講演概要集. I-11. 21-22 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 事口壽男・他: "鋼の微視き裂発生機構に関する基礎実験" 土木学会年次学術講演会講演概要集. 第49回. 584-585 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 事口壽男、伊藤忠幸・他: "鋼の微視き裂挙動の動的観察" 鋼構造年次論文報告集. 第2巻. 495-500 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 事口壽男、伊藤忠幸・他: "微視き裂における表面と内部のき裂挙動について" 土木学会中部支部研究発表会講演概要集. 平成6年度. 67-68 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 事口壽男、岡本英明・他: "予き裂形状の差異による鋼の微視き裂挙動に関する研究" 土木学会中部支部研究発表会講演概要集. 平成6年度. 69-70 (1995)

    • Related Report
      1994 Annual Research Report

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

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