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A New Tension/Compression Fatigue Test Method under Cyclic Axial Loading for Metallic Micro-Elements

Research Project

Project/Area Number 16K05978
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionKobe University

Principal Investigator

Tanaka Hiroshi  神戸大学, 工学研究科, 准教授 (80236629)

Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords構造・機能材料 / マイクロマシン / 金属物性 / 引張圧縮疲労 / 軸力 / 機械材料・材料力学 / 引張圧縮費用
Outline of Final Research Achievements

In this study, a new tension/compression fatigue test method under cyclic axial loading for metallic thin wires used for MEMS was developed. The electrolytic polishing was applied to commercially pure iron wire to prepare a test piece with a minimum wire diameter of 700-180μm, and developed tension/compression fatigue tests were successfully conducted. The developed method is much better than conventional fatigue tests using reversed bending loading, because an accurate value of stress could not be obtained under bending due to plastic deformation.
The fatigue life decreased as the stress ratio, R, increased for R=-1, -0.1 and 0.1. For R=-1 and high-cycle fatigue of R=-0.1, the fatigue crack propagation caused failure, while for R=0.1 and low-cycle fatigue of R=-0.1, fatigue failure due to accumulation of plastic deformation was observed. Also, the effect of wire diameter was examined. Compared at the same stress amplitude, the fatigue life increased as the wire diameter decreased.

Academic Significance and Societal Importance of the Research Achievements

これまでに行われていた細線の引張圧縮疲労試験としては,軸力ではなく,繰返し曲げを与える方法がとられてきた.しかし,曲げでは塑性変形が生じると応力の値を正確に知ることができない致命的な欠点があった.本研究で開発した軸力を用いた試験によって,初めて正しいS-N曲線が得られるようになった.これによって,微小素材に対してS-N曲線に基づく耐疲労設計が可能になることは,工学上とても大きな意義があると考える.

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (5 results)

All 2019 2018 2017 2016

All Presentation (5 results)

  • [Presentation] 金属細線の引張圧縮疲労下における線径の影響に関する研究2019

    • Author(s)
      永岡誠
    • Organizer
      日本機械学会関西支部平成30年度学生員卒業研究発表講演会
    • Related Report
      2019 Annual Research Report 2018 Research-status Report
  • [Presentation] 金属細線の曲げ疲労に及ぼす結晶粒径の影響2018

    • Author(s)
      河野英
    • Organizer
      日本機械学会関西支部平成29年度学生員卒業研究発表講演会
    • Related Report
      2017 Research-status Report
  • [Presentation] TiNi超弾性合金の水素環境下における疲労寿命に及ぼす線径の影響に関する研究2018

    • Author(s)
      大西朱花
    • Organizer
      日本機械学会関西支部平成29年度学生員卒業研究発表講演会
    • Related Report
      2017 Research-status Report
  • [Presentation] 繰返し曲げ応力を受ける金属細線の破壊挙動2017

    • Author(s)
      横川雄大
    • Organizer
      日本機械学会関西学生会平成28年度学生員卒業研究発表講演会
    • Place of Presentation
      大阪大学吹田キャンパス
    • Related Report
      2016 Research-status Report
  • [Presentation] 繰返し曲げ応力を受ける工業用純鉄細線の破壊挙動2016

    • Author(s)
      石本雄太
    • Organizer
      日本機械学会M&M2016材料力学カンファレンス
    • Place of Presentation
      神戸大学六甲キャンパス
    • Year and Date
      2016-10-08
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2021-02-19  

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