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Research on Effect of Hydrogen Environment on Fracture and Shape Memory Deformation of SMA Thin Film Microactuators and Life Prediction

Research Project

Project/Area Number 18560081
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionKobe University

Principal Investigator

TANAKA Hiroshi  Kobe University, Graduate School of Engineering, Associate Professor (80236629)

Co-Investigator(Kenkyū-buntansha) NAKAI Yoshikazu  Kobe University, Graduate School of Engineering, Professor (90155656)
SHIOZAWA Daiki  Kobe University, Graduate School of Engineering, Assistant Professor (60379336)
Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2006: ¥2,400,000 (Direct Cost: ¥2,400,000)
KeywordsMicromachine / Shape Memory Alloys / Actuator / Hydrogen Environment
Research Abstract

This research was conducted for the purpose of clarifying the effect of hydrogen environment on fracture strength and cyclic shape memory deformation of TiNi thin film microactuators. Two kinds of TiNi thin film microactuators with a thickness of 4〜16 μm fabricated by the roll-bonding method and sputtering method were used in this research. Hydrogen charging was conducted by cathodic electrolysis using an acid solution. Hydrogen content increased with increasing charging time and saturated at about 2000 mass ppm. When compared at the same charging time, hydrogen content was larger for thinner film. For both kinds of TiNi thin film microactuators, delayed fracture strength of hydrogen-charged microactuators measured by the SSRT method using a developed micromaterial testing system decreased as the charging time increased and the film thickness got smaller. These results show that delayed fracture strength depends on the hydrogen content in TiNi thin film microactuators. The cyclic shape memory deformation tests were carried out in the hydrogen-charging environment. The recovery stress and strain recovery rate markedly decreased by hydrogen charging. Fatigue tests in the hydrogen-charging environment were also conducted. The obtained S-N curves (the relationship between the stress amplitude and number of cycles to failure) showed shorter fatigue life for lower stress frequency. The relationship between the maximum stress and time to rupture was independent of the stress frequency. This result means that the fatigue fracture of TiNi thin films in hydrogen environment is time-dependent fracture. Also, in this research, TiNi wire-reinforced composite actuators were developed and evaluated as a high-power actuator with small-size TiNi shape memory alloys

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (5 results)

All 2008 2007

All Journal Article (1 results) Presentation (4 results)

  • [Journal Article] 形状記憶合金複合材料アクチュエータの開発と破壊阻止システムへの応用2007

    • Author(s)
      津司 和哉
    • Journal Title

      日本機械学会関西支部第82期定時総会講演会講演論文集

      Pages: 8-6

    • Related Report
      2006 Annual Research Report
  • [Presentation] マイクロモデルを用いた繊維/樹脂界面微視はく離靭性の抽出2008

    • Author(s)
      小岩 康三
    • Organizer
      日本機械学会関西支部第83期定時総会講演会
    • Place of Presentation
      大阪大学豊中キャンパス
    • Year and Date
      2008-03-15
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] Extraction of Fiber/Matrix Micro-Debonding Fracture Toughness by Using Micro Model Composites2008

    • Author(s)
      Kozo, Koiwa
    • Organizer
      83rd Annual Meeting of JSME Kansai Branch
    • Place of Presentation
      Osaka
    • Year and Date
      2008-03-15
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 形状記憶合金複合材料アクチュエータの開発と破壊阻止システムへの応用2007

    • Author(s)
      津司 和哉
    • Organizer
      日本機械学会関西支部第82期定時総会講演会
    • Place of Presentation
      大阪産業大学
    • Year and Date
      2007-03-16
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Suppression of Mode I Crack Propagation in CFRP by Using SMA Composite Actuators2007

    • Author(s)
      Kazuya, Tsushi
    • Organizer
      82nd Annual Meeting of JSME Kansai Branch
    • Place of Presentation
      Osaka
    • Year and Date
      2007-03-16
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2006-04-01   Modified: 2016-04-21  

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