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Construction of nano/micro fracture mechanics

Research Project

Project/Area Number 13650092
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

NOGUCHI Hiroshi  KYUSHU UNIVERSITY, Facalty of Engineering, Ass.Prof., 大学院・工学研究院, 助教授 (80164680)

Co-Investigator(Kenkyū-buntansha) AONO Yuuta  KYUSHU UNIVERSITY, Facalty of Engineering, Research Ass., 大学院・工学研究院, 助手 (70264075)
ODA Yasuji  KYUSHU UNIVERSITY, Faculty of Engineering, Research Ass., 大学院・工学研究院, 助手 (20091340)
HIGASHIDA Kenji  KYUSHU UNIVERSITY, Faculty of Engineering, Ass.Prof., 大学院・工学研究院, 助教授 (70156561)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2002: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2001: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsMolecular Dynamics / Distribution Method / Fracture Toughness / Single Crystal / Ductile-brittle Transition / Meso-characteristics / Inclusion / Surface Roughness
Research Abstract

A method of combined method between the molecular dynamics and the discrete dislocation distribution method in the crack tip has been proposed in order to evaluate the macro characteristics of fracture toughness from micro characteristics of atomistic potential and the meso characteristics of critical resolved shear stress. And the method has been applied to the fracture toughness of the single crystal of W and NaCl, and it has been found from the results that the present method can estimate the ductile-brittle transition quantitatively from the micro and meso charactestics and moreover the strength criteria is very simple, the meso characteristics which control the micro-scale boundary condition of crack tip is very important. Therefore the in-situ observation system has been developed in order to evaluate the characteristics experimentally. Using this system, the mechanism of striation formation has been clarified. Based the mechanism, the evaluation method for fatigue limit characteristics has developed from the meso-characteristics. Namely, the method means that which can evaluate the influence of non-metallic inclusion and surface roughness. In the method, the statistic expression of the inclusion and surface configuration, the statistic expression of meso-scale material properties, and the quantitative expression for influence of micro notch and crack on fatigue limit are used. As the results of comparison between the predicted value and experimental one, it has been found that the proposed method is valid for the strength of materials.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 宮崎達二郎, 野口博司, 大城桂作: "応力制御下における任意のき裂を有する金属の疲労限度の定量的評価"日本機械学会論文集(A編). 68巻673号. 1352-1359 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 宮崎達二郎, 野口博司, 鹿毛正治, 今井良一: "硬度のばらつきに注目した疲労限度信頼性の評価"日本機械学会論文集(A編). 69巻678号. 364-372 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 宮崎達二郎, 野口博司, 鹿毛正治: "高強度鋼の疲労限度の信頼性における切欠き効果のメゾスケール特性からの定量的評"日本機械学会論文集(A編). 69巻678号. 373-381 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 青野雄太, 野口博司, 服部高志: "複雑な表面性状が疲労限度信頼性に及ぼす影響のメゾ特性からの定量的評価"日本機械学会論文集(A編). 69巻678号. 357-363 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Oda, Y.Furuya, H.Noguchi, K.Higashida: "AFM and SEM Observation on Mechanism of Fatigue Crack Growth in a Fe-3.2% Si Single Crystal"International Journal of Fracture. Vol.113. 213-231 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Miyazaki, H.Noguchi, K.Ogi: "Quantitative Evaluation of Fatigue Limit of a Metal with an Arbitraly Crack under a Stress Controlled Condition"Transactions of the Japan Society of Mechanical Engineers. 68-673. 1352-1359 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Miyazaki, H.Noguchi, M.Kage, R.Imai: "Evaluation for Fatigue Limit Reliability from Consideration of Hardness Scatter"Transactions of the Japan Society of Mechanical Engineers. 69-678. 364-372 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Miyazaki, H.Noguchi, M.Kage: "Evaluation for Notch Effect in Fatigue Limit Reliability of High Strength Steels from Meso-Scale Characteristics"Transactions of the Japan Society of Mechanical Engineers. 69-678. 373-381 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Aono, H.Noguchi, T.Hattori: "Quantatative Evaluation for Influence of Complex Surface Texture on Fatigue Limit Reliability from Mesocharacteristics"Transactions of the Japan Society of Mechanical Engineers. 69-678. 357-363 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Oda, Y.Furuya, H.Noguchi, K.Higashida: "AFM and SEM Observation on Mechanism of Fatigue Crack Growth in an Fe-Si Syngle Crystal"International Journal of Fracture. 113. 213-231 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 宮崎達二郎, 野口博司, 大城桂作: "応力制御下における任意のき裂を有する金属の疲労限度の定量的評価"日本機械学会論文集A編. 68巻673号. 1352-1359 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 青野雄太, 野口博司, 服部高志: "複雑な表面性状が疲労限度信頼性に及ぼすメゾ特性からの定量的評価"日本機械学会論文集A編. 69巻678号(印刷中). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 宮崎達二郎, 野口博司, 鹿毛正治: "高強度鋼の疲労限度の信頼性における切欠き効果のメゾ特性からの定量的評価"日本機械学会論文集A編. 69巻678号(印刷中). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 宮崎達二郎, 野口博司, 鹿毛正治: "硬度のばらつきに注目した疲労限度信頼性の評価"日本機械学会論文集A編. 69巻678号(印刷中). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Y.ODA, Y.FURUYA, H.NOGUCHI: "AFEM and S E M Observation on Mechanism of Fatigue Crack Growth in a Fe-3,2% Si Single Crystal"International Journal of Fracture. Vol.113. 213-231 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Yoshiyuki FURUYA, Hiroshi, NOGUCHI: "Combined Method of Molecular Dynamics with Micromechanics in Simulations of Crack Propagation"Metarials Transactions, Japan. 42. 45-51 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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