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Evaluation of Mechanical Properties of Microelements and Environmental Strength under Dynamic Loading

Research Project

Project/Area Number 09450048
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

KOMAI Kenjiro  KYOTO UNIVERSITY,Graduate School of Eng., Dept.Mech.Eng., Professor, 工学研究科, 教授 (70025948)

Co-Investigator(Kenkyū-buntansha) MINOSHIMA Kohji  KYOTO UNIVERSITY,Graduate School of Eng., Dept.Mech.Eng., Associate Professor, 工学研究科, 助教授 (50174107)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥14,000,000 (Direct Cost: ¥14,000,000)
Fiscal Year 1998: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1997: ¥11,300,000 (Direct Cost: ¥11,300,000)
KeywordsMicroelement / Micromachine / Environmental Strength under Dynamic Loading / Small Notch Effects / Fatigue / Vacuum Effects / Water Environment / Atomic Force Microscopy / 曲げ強度 / 引張強度 / 疲労強度 / 高強度・高弾性繊維
Research Abstract

The fracture and fatigue behavior of micromaterials including single-crystal Si microelements and an advanced fiber reinforcement of aramid fiber have been performed. The specially designed testing machines are developed, which are capable of performing quasi-static and fatigue tests in mum sized microelements. Single crystal Si microelements deform elastically until final failure, giving a brittle nature. The fracture strength increases with a decrease in specimen size, and the maximum fracture strength is about 7.7 GPa. However, Si microelements are sensitive to notch, and sub-mum deep notch introduced by focused ion beam decreases the fracture strength. As for fatigue loading, no fatigue damage is observed even though the surface is nanoscopically examined by an atomic force microscope. However, in water, the fatigue lives are decreased : crack formation is promoted by a synergistic effect of dynamic loading and water environment. Atomic force microscopy is capable of imaging a nanoscopic crack, which causes the failure in water. The fiber strength of aramid fiber, Kevlar 49, is strongly influenced by an environment : water absorption and vacuum conditioning decrease the fracture strength. As for fatigue, aramid fibers have excellent fatigue properties, compared with metallic materials, showing gentle slope in s-N curves, although they have large scatter band. As for vacuum effects, the fatigue strength in vacuum is higher than that conducted in air. The fiber breaks with fiber splitting, and the fiber surface damage induced by fatigue loading in air and in vacuum was examined by using an atomic force microscope, and the influence of environment on fatigue and damage mechanisms are discussed.

Report

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

    (42 results)

All Other

All Publications (42 results)

  • [Publications] 駒井 謙治郎: "マイクロマテリアル : 1.マイクロマテリアルの現代的ニーズと今後の展開" 材料. 46-12. 1442-1447 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 箕島 弘二: "アラミド単繊維の機械的特性と疲労に及ぼす真空環境効果" 日本機械学会関西支部第73期定時総会講演会講演論文集. No.984-1. 12-19-12-20 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 箕島弘二: "マイクロマテリアルの機械的特性評価法" 材料. 47-4. 427-433 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Minoshima: "Influence of Vacuum and Water on Tensile Fracture Behavior of Aramid Fibers" Damage and Fracture Mechanics-Computer Aided Assessment and Control. 595-604 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Komai: "Fracture and Fatigue Behavior of Single Crystal Silicon Microelements and Nanoscopic AFM Damage Evaluation" Microsytem Technologies. 5-1. 30-37 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 箕島弘二: "セラミックス系単繊維の引張破壊特性に及ぼす真空・水環境効果と繊維表面損傷のAFM微視観察" 日本機械学会論文集, A編. 64-628. 2964-2969 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 駒井謙治郎: "SiマイクロエレメントのFIB加工と破壊強度に及ぼす微小切欠き効果" 第42回日本学術会議材料研究連合講演会. 273-274 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 箕島弘二: "アラミド単繊維の疲労破壊特性に及ぼす真空環境効果" 日本機械学会第76期全国大会講演論文集, No.98-3. Vol.1. 723-724 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 駒井謙治郎: "Siマイクロエレメントの破壊と疲労に及ぼす微小切欠きと水環境の影響" 日本機械学会関西支部第74期定時総会講演会講演論文集. No.994-1. 8-21-8-22 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 駒井謙治郎: "マイクロマテリアルにおける機械的特性とナノスコピック損傷評価" 日本機械学会論文集, A編. 65-631 印刷中. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 箕島弘二: "高強度・高弾性単繊維の横方向圧縮試験と環境効果" 日本機械学会論文集, A編. 65-631 印刷中. (19999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Minoshima: "Influence of Specimen Size and sub-Micron Notch on the Fracture Behavior of Single Crystal Silicon Microelements and Nanoscopic AFM Damage Evaluation" Materials Science of Microelectromechanical Systems (MEMS) Devices, A.H. Heuer and S.J.Jacobs, Eds., MRS Symposium Proceedings. Vol.546 in press. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Komai: "Fracture and Fatigue Behavior in Micromaterials" Proceedings of International Conference on Small Fatigue Cracks. in press. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Komai, Micromaterials I: "Current Needs and Future Trends of Micromaterials" Journal of the Society of Materials Science, Japan. Vol.46. 1442-1447 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Minoshima, et al.: "The Influence of Vacuum on Tension-Tension Fatigue Fracture Behavior of Aramid Fibers" Proceedings of 73rd Annual Meeting of JSME of Kansai Div.No.984-1. 12-19-12-20 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Minoshima et al.: "Micromaterials V : Mechanical Evaluation of Micromaterials" Journal of the Society of Materials Science, Japan. Vol.47. 427-433 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Minoshima et al.: "Infuluence of Vacuum and Water on Tensile Fracture Behavior of Aramid Fibers" Damage and Fracture Mechanics-Computer Aided Assessment and Control. 595-604 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Komai, et al.: "Fracture and Fatigue Behavior of Single Crystal Silicon Microelements and Nanoscopic AFM Damage Evaluation" Microsytem Technologies. Vol.5. 30-37 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Minoshima et al.: "Influence of Vacuume and Water on Fracture Behavior of Ceramic Precursor Type Fibers and AFM Observation of Surface Damage" Transactions of Japan Society of Mechanical Engineers, Series A. Vol.64. 2964-2969 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Komai et al.: "Focused Ion Beam Machining of Single Crystal Si Microelement and the Influence of Micro-Notch on Fracture Behavior" Proceeding of 42nd Japan Congress on Materials Research, The Science Council of Japan. 273-274 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Minoshima et al.: "The Effects of Vacuum Environment on Fatigue Fracture Behavior of Aramid Fibers" Proceedings of the 76th JSME Fall Annual Meeting. No.98-3, Vol.I. 723-724 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Komai et al.: "Influence of Micro-Notch and Water on Fracture and Fatigue Strength of Single-Crystal Silicon Microelements" Proceedings of 74th Annual Meeting of JSME of Kansai Div.No.994-1. 8-21-8-22 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Komai et al.: "Mechanical and Nanoscopic Damage Evaluation in Micromateirals" Transactions of Japan Society of Mechanical Engineers, Series A. Vol.65(in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Minoshima et al.: "Lateral Compression of High Strength and High Elastic Modulus Fibers and Influences of Environments" Transactions of Japan Society of Mechanical Engineers, Series A. Vol.65(in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Minoshima: "Influence of Specimen Size and Sub-Micron Notch on the Fracture Behavior of Single Crystal Silicon Microelements and Nanoscopic AFM Damage Evaluation" Materials Science of Microelectromechanical Systems(MEMS)Devices, A.H.Heuer and S.J.Jacobs, Eds., MRS Symposium Proceedings. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Komai et al.: "Fracture and Fatigue Behavior in Micromaterials" Proceedings of International Conference on Small Fatigue Cracks. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 箕島弘二: "マイクロマテリアルの機械的特性評価法" 材料. 47-4. 427-433 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Minoshima: "Influence of Vacuum and Water on Tensile Fracture Behavior of Aramid Fibers" Damage and Fracture Mechanics-Computer Aided Assessment and Control. 595-604 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Komai: "Fracture and Fatigue Behavior of Single Crystal Silicon Microelements and Nanoscopic AFM Damage Evaluation" Microsytem Technologies. 5-1. 30-37 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 箕島弘二: "セラミックス系単繊維の引張破壊特性に及ぼす真空・水環境効果と繊維表面損傷のAFM微視観察" 日本機械学会論文集,A編. 64-628. 2964-2969 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 駒井謙治郎: "マイクロマテリアルにおける機械的特性とナノスコピック損傷評価" 日本機械学会論文集,A編. 65-631. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 箕島弘二: "高強度・高弾性単繊維の横方向圧縮試験と環境効果" 日本機械学会論文集,A編. 65-631. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Minoshima: "Influence of Specimen Size and Sub-Micron Notch on the Fracture Behavior of Single Crystal Silicon Microelements and Nanoscopic AFM Damage Evaluation" Materials Science of Microelectromechanical Systems (MEMS) Devices, A.H.Heuer and S.J.Jacobs,Eds.,MRS Symposium Proceedings. Vol.546. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Komai: "Fracture and Fatigue Behavior in Micromaterials" Proceedings of International Conference on Small Fatigue Cracks. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 駒井謙治郎: "SiマイクロエレメントのFIB加工と破壊強度に及ぼす微小切欠き効果" 第42回日本学術会議材料研究連合講演会. 273-274 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 箕島弘二: "アラミド単繊維の疲労破壊特性に及ぼす真空環境効果" 日本機械学会第76期全国大会講演論文集,No.98-3. Vol.1. 723-724 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 駒井謙治郎: "Siマイクロエレメントの破壊と疲労に及ぼす微小切欠きと水環境の影響" 日本機械学会関西支部第74期定時総会講演会講演論文集. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Komai: "Fracture and Fatigue Behavior of Single Crystal Si Microelement and Nanoscopic AFM Damage Evaluation" ICM&M'97. 733-738 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Minoshima: "Influence of Vacuum and Water on Tensile Fracture Behavior of Aramid Fibers" Advanced Technology in Experimental Mechanics. 373-378 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 箕島 弘二: "アラミド繊維の引張破壊特性に及ぼす真空・水環境効果と繊維損傷のAFM微視観察" 日本機械学会論文集,A編. 63-614. 2142-2148 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 駒井 謙治郎: "マイクロマテリアル:1.マイクロマテリアルの現代的ニーズと今後の展開" 材料. 46-12. 1442-1447 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 箕島 弘二: "アラミド単繊維の機械的特性と疲労に及ぼす真空環境効果" 日本機械学会関西支部第73期定時総会講演会講演論文集. No.984-1. 12-19-12-20 (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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