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Analyzes of Fracture Process Zone by AE and Constitution of its Numerical Model

Research Project

Project/Area Number 06650493
Research Category

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

Allocation TypeSingle-year Grants
Research Field 土木材料・力学一般
Research InstitutionTohoku University

Principal Investigator

NIISEKI Shigeru  Tohoku University, Faculty of Engineering Associate Professor, 工学部, 助教授 (30005524)

Co-Investigator(Kenkyū-buntansha) YAMANOUCHI Masaji  Fukushima College of TechnologyAssociate Professor, 助教授 (80132570)
KISHINO Yuji  Tohoku University, Faculty of Engineering Professor, 工学部, 教授 (00005448)
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: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1994: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsConcrete / Mortar / Fracture Process Zone / 3-D AE Source Location / AE Wave Form Analysis / Continuum Damage Theory / AE Event Controlled Loading / 岩質材料 / 3次元AE位置標定 / 仮想クラックモデル / 損傷発展側
Research Abstract

It is generally recognized that the fracture process zone is composed of a microcracking zone including very many microcracks and bridging zone with cohesive stress. However, lengths, widths and shapes of these zones in concrete and mortar have not been clarified.
To identify the microcracking zones in concrete and mortar specimens, we used the loading method controlled by the AE event count rate in near the maximum load and strain softening-region and three-dimensional AE source location. The dimensions of concrete and mortar specimens are 150 mm high, 94 mm thick and 550 wide. The maximum grain sizes of aggregate in these specimens are 15 and 5 mm respectively. As a result of identification, the average lengths of microcracking zones in concrete and mortar were 51 and 61 mm respectively, and their average widths were 71 and 57 mm respectively. In addition, by penetration of dye, we identified that the bridging zones in concrete and mortar specimens were 54 and 31 mm. From the above results, the total lengths of fracture process zones in concrete and mortar specimens were 105 and 92 mm.
Based on the statistical distributions of directions of microcrack surfaces obtained by the AE waveform analysis, we formulated an anisotropic continuum damage theory. Then, by this theory and the finite element method, we constituted a numerical model of the fracture process zone, and analyzed crack growth in the three-point bending test. Compared with experimental results, the extent of various damage levels of the fracture process zone was fairly good, but the maximum load-displacement curve was not satisfactory.

Report

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

    (24 results)

All Other

All Publications (24 results)

  • [Publications] Shigeru,Niiseki: "AE Waveform Analysis in Fracture Toughness Test of Mortar and Concrete" Progress in Acoustic Emission. VII. 405-410 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 新関 茂: "3次元AE位置標定によるコンクリート梁内の破壊進行領域の長さと幅の解析" 構造工学論文集. 41A. 541-547 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 武川啓悟: "結合力と広がりを考慮したコンクリート内部の破壊進行領域の解析" 土木学会平成6年度東北支部技術研究発表会講演概要. 34-35 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 飯沼将之: "コンクリートの破壊進行領域内の2次元及び3次元表示" 土木学会第50回年次学術講演会講演概要集. CS. 72-73 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 飯沼将之: "異方性を考慮した損傷理論によるコンクリート内のクラックの解析" 土木学会平成7年度東北支部技術研究発表会講演概要. 538-539 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 奏 宗之: "AE位置標定と染料によるコンクリート梁内の破壊進行領" 土木学会平成7年度東北支部技術研究発表会講演概要. 542-543 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Niiseki, S., Satake, M., and Gohke, M.: "AE Waveform Analysis in Fracture Toughness Test of Mortar and Concrete" Progress of Acoustic Emission. VII,JSNDI. 405-405 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Niiseki, S., Kishino, Y., Iinuma, M.and Mori, T.: "Analysis of Length and Width of Fracture Process Zone in Concrete Beam by Three-Dimensional AE Source Location" Journal of Structural Engineering. Vol. 41A. 161-175 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Takekawa, K.and Niiseki, S.: "Analysis of Fracture Process Zone with Width and Cohesive Stress" Annual Congress of Tohoku Branch of Japan Society of Civil Engineers. 34-35 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Iinuma, M.and Niiseki, S.: "Two-and Three-Dimensional Pictures of Damage of Fracture Process Zone in Concrete" 50th Annual Congress of Japan Society of Civil Engineers. 72-73

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Iinuma, M.and Niiseki, S.: "Analysis of Crack in Concrete by Anisotropic Continuum Damage Theory" Annual Congress of Tohoku Branch of Japan Society of Civil Engineers. 538-539 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hata, M.and Niiseki, S.: "Observation of Fracture Process Zone by AE Source Location and Dye Penetration" Annual Congress of Tohoku Branch of Japan Society of Civil Engineers. 542-543 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 飯沼 将之: "異方性を考慮した損傷理論によるコンクリート内のクラック進展の解析" 平成7年度土木学会東北支部技術研究発表会講演概要. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 秦 宗之: "AE位置標定と染料によるコンクリート梁内の破壊進行領域の観察" 平成7年度土木学会東北支部技術研究発表会講演概要. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 飯沼 将之: "コンクリートの破壊進行領域内の損傷度の2次元及3次元表示" 土木学会第50回年次学術講演会講演概要集. CS. 72-73 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 長田 隆信: "AE事象率法によるコンクリートとモルタルの破壊エネルギーの考察" 土木学会第50回年次学術講演会講演概要集. CS. 60-61 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Shigeru Niiseki: "Fundamental Research for Evoluating Applied Stress in Concrete by Kaiser Effect" Acoustic Emission. 5. 161-175 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 新関 茂: "3次元AE位置標定によるコンクリート梁内の破壊進行領域の長さと幅の解析" 構造工学論文集. 41A. 541-547 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 新関茂: "3次元AE位置標定によるコンクリート梁内の破壊進行領域の長さと幅の解析" 構造工学論文集. 41A. (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 押永喜晴: "AE事象率を基礎とする載荷方法に関する研究" 平成6年土木木学会東北支部技術研究発表会講演概要. 17-18 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 長田隆信: "AE事象率載荷法によるコンクリートとモルタルの破壊エネルギーの解析" 平成6年度土木学会東北支部技術研究発表会講演概要. 19-20 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 工藤 守: "AE事象率載荷法によるコンクリートの破壊メカニズムの回折" 平成6年度土木学会東北支部技術研究発表会講演概要. 21-22 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 武川啓悟: "結合力と広がりを考慮したコンクリート内の破壊進行領域の解析" 平成6年度土木学会東北支部技術研究発表会講演概要. 33-34 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 飯沼将之: "連続損傷によるコンクリート内の破壊進行領域の解析" 土木学会49回年次学術講演会講演概要集. 580-581 (1994)

    • Related Report
      1994 Annual Research Report

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

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