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Innovation of fracture toughness test for new horizon of rock fracture mechanics

Research Project

Project/Area Number 25630416
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Earth system and resources engineering
Research InstitutionKumamoto University

Principal Investigator

OBARA Yuzo  熊本大学, 自然科学研究科, 教授 (50135315)

Co-Investigator(Kenkyū-buntansha) ISHII Tateki  木更津工業高等専門学校, 准教授 (60400280)
Research Collaborator KATAOKA Minami  
Project Period (FY) 2013-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords岩石破壊力学 / 破壊靱性試験 / マイクロ岩石供試体 / 微視的破壊靱性 / 巨視的破壊靱性 / 有限被膜法 / 岩盤破壊力学 / マイクロ岩石試験片
Outline of Final Research Achievements

A new material testing system was developed to evaluate microscopic fracture toughness of mineral grains within rock. This testing system consists of an optical microscope, stages, loading apparatus and data collection unit.The specimen used in this test was micro-sized cantilever beam type (10 × 10 × 50micro-m) with an artificial notch. The microscopic fracture toughness test was completed successfully and it is shown that the new testing system is available to evaluate microscopic fracture toughness of rocks. The experimental results show that the microscopic fracture toughness are different from each specimen. It was discussed that these microscopic properties are influenced by the mechanical weak planes such as cleavage due to crystal structures.
Furthermore, numerical fracture tests by FCM were conducted. These numerical tests simulated a conventional semi-circular bending tests. The numerical results agree with that of the experiments in machanical and facture behavior.

Report

(3 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • Research Products

    (9 results)

All 2014 2013 Other

All Journal Article (8 results) (of which Peer Reviewed: 7 results,  Open Access: 1 results) Presentation (1 results)

  • [Journal Article] A new testing method to estimate microscopic fracture toughness of rock2014

    • Author(s)
      M. Kataoka, T. Ito, K. Takashima, Y. Obara
    • Journal Title

      Proceedings of ROCKMEC’2014-XIth Regional Rock Mechanics Symposium

      Volume: 1 Pages: 91-96

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Determination of Dynamic Fracture Toughness of Rocks using Straight Notched Disk Bending (SNDB) Specimen2014

    • Author(s)
      S.H Cho, H.M Kang, M.S Kim, H. Eustache, M.Kataoka, Y.Obara, K.Xia
    • Journal Title

      Proceedings of 8th Asian Rock Mechanics Symposium

      Volume: 1

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Development of an ISRM Suggested Method for Determining Mode I Static Fracture Toughness2014

    • Author(s)
      M.D. Kuruppu, Y. Obara, M.R. Ayatollahi, K.P. Chong, T. Funatsu
    • Journal Title

      Proceedings of 8th Asian Rock Mechanics Symposium

      Volume: 1

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Influence of Loading Rate on Fracture Toughness of Rock by Semi-Circular Bend (SCB) Test2014

    • Author(s)
      Minami Kataoka, Hyeong-Min Kang, Sang-Ho Cho,Yuzo Obara
    • Journal Title

      Proceedings of 8th Asian Rock Mechanics Symposium

      Volume: 1

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A method for Measurement of rock stress change - Cross-sectional borehole deformation method -2014

    • Author(s)
      Y. Obara, T. Yoshinaga, M. Kataoka, T. Yokoyama
    • Journal Title

      International Journal of the JCRM

      Volume: 10 Pages: 5-10

    • NAID

      130004709082

    • Related Report
      2014 Annual Research Report
  • [Journal Article] Estimation of Fracture Toughness of Anisotropic Rocks by Semi-Circular Bend (SCB) Tests Under Water Vapor Pressure2014

    • Author(s)
      M. Kataoka, Y. Obara, M. Kuruppu
    • Journal Title

      Rock Mech Rock Eng

      Volume: 47 Issue: 4 Pages: 267-274

    • DOI

      10.1007/s00603-014-0665-y

    • NAID

      120006600481

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] SCB試験による水蒸気圧下での種類の異なる岩石の破壊靭性の評価2013

    • Author(s)
      片岡みなみ,尾原祐三
    • Journal Title

      Journal of MMIJ

      Volume: 129 Pages: 425-432

    • NAID

      10031182240

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Influence of water vapor pressure in surrounding environment on strength and fracture toughness of rocks2013

    • Author(s)
      M. Kataoka , Y. Obara , H.S. Jeong
    • Journal Title

      Proceedings of EUROCK 2013

      Volume: 1 Pages: 278-292

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Presentation] 岩石の微視的破壊靱性評価の試み

    • Author(s)
      片岡みなみ・伊東孝史・山室賢輝・高島和希・尾原祐三
    • Organizer
      資源・素材学会 九州支部 (例会講演会)
    • Place of Presentation
      熊本大学
    • Related Report
      2013 Research-status Report

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Published: 2014-07-25   Modified: 2019-07-29  

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