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Analyses of Time Dependent Behavior of Fracture Process Zone in Concrete and Constitution of Its Numerical Model

Research Project

Project/Area Number 09650516
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 土木材料・力学一般
Research InstitutionFukushima National College of Technology

Principal Investigator

MASAJI Yamanouchi  Fukushima National College of Technology, Civil Engineering, Associate Professor, 建設環境工業科, 助教授 (80132570)

Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1998: ¥400,000 (Direct Cost: ¥400,000)
KeywordsConcrete / Fracture Process Zone / Tension Softening Process / Time Dependence / 3-D AE Source Location / AE Energy / Fractal Dimension / energy of crack formation / 引張軟化則 / アコースティックエミッション / アコースティック・エミッション
Research Abstract

The fracture parameters such as fracture energy and brittleness are deeply concerned with the cumulative process of micro cracking in the fracture process zone. The purpose of this research is to obtain the time dependent behavior of micro cracking in the fracture process zone of notched concrete beam under constant loadings, using three dimensional AE source location method.
The velocity of the crack mouth opening displacement changes from steady to accelerative state beyond a certain critical point. AE source locations distribute widely in the steady state, and in a line at the front of the fracture process zone after the critical point. This means that the process of accelerative micro craking is connected with the initial state of tension softening.
To research on the critical point, the tension softening diagram is evaluated by means of poly-linear inverse analysis method. On the basis of comparison between AE source locations and the crack type distributions in the fractured cross section, meso-scopic fracture mechanism in tension softening process is considered. It makes clear that the cumulative AE energy is increasing with the same manner of the energy of crack formation. This result suggests that the proposed AE energy represents quantitatively micro cracking in fracture process zone.
In the future, it is necessary to determine the amount of AE energy correspond to the critical point and to investigate the relation between brittleness.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 山ノ内正司: "AE解析によるコンクリートの引張軟化過程の考察"コンクリート工学年次論文報告書. 21.2. 919-924 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 山ノ内正司: "損傷変数に基づいたコンクリートのAE発生特性の定式とその考察"構造工学論文集. 43A. 431-436 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 鈴木隆裕: "コンクリート破壊進行領域におけるAEエネルギーの時間依存性挙動"平成9年度土木学会東北支部技術研究発表会講演概要. 542-543 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 木村隆範: "AEエネルギーに基づいたコンクリートの引張軟化過程の考察"平成9年度土木学会東北支部技術研究発表会講演概要. 540-541 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 山ノ内正司: "AE解析によるコンクリートの引張軟化過程の考察"平成10年度土木学会東北支部技術研究発表会講演概要. 656-657 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yamanouchi, M.: "Formulation of Acoustic Emission Actinity in Concrete based on Scalar Damage Parameter and its Consideration"Journal of Structural Engineering. Vol 43A. 431-436 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yamanouchi, M., Kishino, Y. and Niiseki, S.: "Some Considerations on Tension Softening Process in Concrete by Acoustic Emission Analysis"Proceedings of the Japan Concrete Institute,. Vol. 21, No. 2. 919-924 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Suzuki, T. and Yamanouchi, M.: "Time-dependent Behavior of AE Energy in Fracture Process Zone of Concrete"Annual Congress of Tohoku Branch of Japan Society of Civil Engineers. 542-543 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kimura, T. and Yamanouchi, M.: "On Tension Softening Process in Concrete based on AE Energy"Annual Congress of Tohoku Branch of Japan Society of Civil Engineers. 540-541 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yamanouchi, M., Kishino, Y. and Niiseki, S.: "Some Considerations on Tension Softening Process in Concrete by Acoustic Emission Analysis"Annual Congress of Tohoku Branch of Japan Society of Civil Engineers. 656-657 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 木村 孝範: "AEエネルギーに基づいたコンクリートの引張軟化過程の考察" 平成9年度土木学会東北支部技術研究発表会講演概要. 540-541 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 鈴木 隆裕: "コンクリート破壊進行領域におけるAEエネルギーの時間依存性挙動" 平成9年度土木学会東北支部技術研究発表会講演概要. 542-543 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 山ノ内 正司: "AE解析によるコンクリートの引張軟化過程の考察" 平成10年度土木学会東北支部技術研究発表会講演概要. 656-657 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 山ノ内 正司: "AE解析によるコンクリートの引張軟化過程の考察" コンクリート工学年次論文報告集. 21巻. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 木村孝範・山ノ内正司: "AEエネルギーに基づいたコンクリートの引張軟化過程の考察" 平成9年度土木学会東北支部技術研究発表会講演概要. 540-541 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 鈴木隆裕・山ノ内正司: "コンクリート破壊進行領域におけるAEエネルギーの時間依存性挙動" 平成9年度土木学会東北支部技術研究発表会講演概要. 542-543 (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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