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Influence of Environment on Fracture Behavior of High-Strength, High-Modulus Fibers and Nanoscopic AFM Damage Evaluation

Research Project

Project/Area Number 08650107
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

MINOSHIMA Kohji  Kyoto University, Department of Mechanical Engineering, Associate Professor, 工学研究科, 助教授 (50174107)

Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1997: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1996: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsHigh-Strength Fiber / High Modulus Fiber / Single Fiber Test / Fracture / Fatigue / Environmental Strength / Atomic Force Microscopy / Nanofractography
Research Abstract

This research project focuses the fracture behavior of high-strength and high elastic modulus fibers, i.e., ceramic precursor type fibers and aramid fibers. Special attention is paid to the influence of an testing environment on the fracture behavior, and nanometric surface damage is evaluated with atomic force microscopy (AFM). In order to conduct tensile and fatigue testing of fibers with small diameter of micrometers, a specially designed testing machine, which enables mechanical testing including fatigue of microelements such as fibers in a controlled environment was used. Loads are applied to a specimen by means of an electromagnetic actuator. The testing machine is equipped with a chamber which can control environments such as vacuum, wet and/or dry gases. The longitudinal elastic modulus of the ceramic fibers including gamma-alumina (Altex^<<O!>>), SiC (Nicalon), and Si-Ti-C-O (Tyranno^<<O!>>))were independent of testing environment, i.e., vacuum, air and deionized water. However, the quasi-static fiber strength in vacuum was the highest, and decreased in the order of in air, and in water : the fiber strength decreased with increasing water content in an environment, and with decreasing displacement(strain)rate. Similarly to ceramic fibers, the fracture strength of aramid fibers was sensitive to a testing environment : the mechanical properties of aramid fibers including Kevlar^<<O!>>) fibers and Technora^<<O!>>) fiber, longitudinal elastic modulus and fracture strength, decreased by water absorption. When tested in vacuum, the air-preconditioned fiber strength of Kevlar 49^<<O!>>) decreased from that conducted in air. As for fatigue, the Kevalr 49 fiber had superior fatigue resistance compared with metallic materials. However, the tension-tension fatigue strength conducted in vacuum was higher than that conducted in laboratory air. The fiber surface damage was examined by an AFM,and the degradation and fracture/fatigue mechanisms are discussed.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 箕島 弘二: "アラミド単繊維の横方向圧縮特性に及ぼす環境効果" 日本機械学会第74期全国大会講演論文集. No.96-15. 145-146 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 箕島 弘二: "アラミド繊維およびアラミド繊維強化エポキシ樹脂基複合材料の破壊に及ぼす真空環境効果" 日本機械学会第74期全国大会講演論文集. No.96-15. 207-208 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [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" 第74期日本機械学会通常総会講演会講演論文集. No.97-1,Vol.II. 63-64 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Minoshima: "Influence of Vacuum and Water on Tensile Fracture Behavior of Aramid Fibers" Advanced Technology in Experimental Mechanics. 373-378 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [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)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 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
      1997 Final Research Report Summary
  • [Publications] K.Minoshima: "Environmental Effects on Transverse Compression of Aramid Fibers" Proceedings of the 74th JSME Fall Annual Meeting. No.96-15. 145-146 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Minoshima: "The Influence of Environment on Fracture Behavior of Aramid Fiber and Its Epoxy Matrix Composite" Proceedings of the 74th JSME Fall Annual Meeting. No.96-15. 207-208 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Minoshima: "Influence of Vacuum and Water on Tensile Fracture Behavior of Aramid Fiber and Nanoscopic AFM Observation of Fiber Surface Damage" Proceedings of the 74th JSME Spring Annual Meeting. No.97-1, Vol.II. 63-64 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Minoshima: "Influence of Vacuum and Water on Tensile Fracture Behavior of Aramid Fibers" Advanced Technology in Experimental Mechanics. 373-378 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Minoshima: "Nanometric AFM Observation of Fiber Surface Damage and Influence of Vacuum and Water on Tensile Fracture Behavior of Aramid Fibers" Transactions of Japan Society of Mechanical Engineers. Series A. 2142-2148 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Minoshima: "The Influence of Vacuum on Tension-tension Fatigue Fracture Behavior of Aramid Fibers" Proc.73rd Annual Meeting of JSME of Kansai Div.No.984-1. 12-19-12-19 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [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] 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
  • [Publications] 箕島 弘二: "アラミド単繊維の横方向圧縮特性に及ぼす環境効果" 日本機械学会第74期全国大会講演論文集. No.96-15. 145-146 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 箕島 弘二: "アラミド繊維およびアラミド繊維強化エポキシ樹脂基複合材料の破壊に及ぼす真空環境効果" 日本機械学会第74期全国大会講演論文集. No.96-15. 207-208 (1996)

    • Related Report
      1996 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" 第74期日本機械学会通常総会講演会講演論文集. (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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