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1991 Fiscal Year Final Research Report Summary

Detection of Fatigue Degradation in Functional Thin Surface Film Layer and Its Inspection System

Research Project

Project/Area Number 02555147
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 金属材料(含表面処理・腐食防食)
Research InstitutionTokyo Institute of Technology

Principal Investigator

HIGO Yakichi  Tokyo Institute of Technology, Precision and Intelligence Laboratory, Associate Professor, 精密工学研究所, 助教授 (30016802)

Co-Investigator(Kenkyū-buntansha) OHUCHI Chiaki  NKK Ltd., New Materials Division, Director, 新材料事業部, 技術室次長
KUMAI Shinji  Tokyo Institute of Technology, Precision and Intelligence Laboratory, Research A, 精密工学研究所, 助手 (00178055)
NUNOMURA Shigetomo  Tokyo Institute of Technology, Precision and Intelligence Laboratory, Professor, 精密工学研究所, 教授 (60016764)
Project Period (FY) 1990 – 1991
KeywordsThin film / Fatigue / Bond strength / Indenter / Wave analysis
Research Abstract

Functional surface films have been practically used in the field of High-Tech electronics devices and as protective coating materials of the products which suffer from corrosive environment. Such thin surface films are inevitably exposed to the condition of cyclic strain resulting from various kinds of heat treatment in their production process, and this induce the cracking and/or decohesion of the film. However, no inspection method has been developed in order to evaluate the important mechanical properties of the film such as fatigue strength or bond strength. The aim of the present research is to develop the noble testing method to examine the fatigue properties of the thin surface film.
The indentation loading which has been used for hardness measurement was evolved into the cyclic loading system to the specimen surface using a ball indenter. This succeeded in developing intensively cyclically strained micron-scale region beneath the specimen surface. An age-hardened aluminum alloy was cyclically loaded in this testing system, and the formation of the selective fatigued region (Persistent Slip Band) was successfully recognized at the expected position. The position was consistent with the theoretical calculation.
A non-linear component, corresponding to the cyclic plastic strain was extract from the experimentally measured stress-strain response using an acoustic wave analysis method. It was demonstrated that the non-linear component relate to the film thickness and the fretting condition between the film and the ball. Constructing databases for various kinds of films is required to improve the reliability of the presented testing method.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 野口 新二,熊井 真次,肥後 矢吉,布村 成具: "Heltz接触を利用した微小疲労試験" 日本金属学会秋期大会講演概要. 107. 226 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.NOGUCHI,Y.HIGO,S.KUMAI and S.NUNOMURA: "Indentation loading Method as a Miniturized Fatigue Testing" Fatigue 90. 4. 2291-2296 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 横井 龍雄,野口 新二,熊井 真次,肥後 矢吉,布村 成具: "微小押し込み疲労試験における疲労損傷位置と圧痕形状" 日本金属学会春期大会講演概要. 108. 142 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 野口 新二,横井 龍雄,熊井 真次,布村 成具: "押し込み疲労試験における疲労き裂開始挙動と標準疲労試との比較検討" 日本金属学会秋期大会講演概要. 109. 391 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shinji Nogichi, Shinji Kumai, Yakichi Higo and Shigetomo Nunomura: "Hertzian contact application in miniaturized fatigue testing" Proc. of Japan Institute of Metals. 107. 226 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shinji Noguchi, Yakichi Higo, Shinji Kumai and Shigetomo Nunomura: "Indentation Loading Method as a Miniaturized Fatigue Testing" Fatigue '90. 4. 2291-2296 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tatsuo Yokoi, Shinji Noguchi, Shinji Kumai Yakichi Higo and Shigetomo Nunomura: "Location of the Fatigue Damage and Shape of the Impression in Micro Indentation Fatigue Test" Proc. of Japan Institute of Metals. 108. 142 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shinji Noguchi, Tatsuo Yokoi, Shinji Kumai and Shigetomo Nunomura: "Fatigue Crack Initiation Behavior in the Cyclic Indentation Loading" Proc. of Japan Institute of Metals. 109. 391 (1991)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-16  

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