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SEM observation of damege mechanism of micro-tribological fracture on hard disk surface

Research Project

Project/Area Number 04402022
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field 材料力学
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

MURAKAMI Yukitaka  Kyusyu Univ., Mech.Engng., Professor, 工学部, 教授 (10038010)

Co-Investigator(Kenkyū-buntansha) ONO Bunji  Kyusyu Univ., Mech.Engng., Research Asoc., 工学部, 助手 (60224276)
TORIYAMA Tosiyuki  Kyusyu Univ., Mech.Engng., Research Asoc., 工学部, 助手 (30227681)
KOBAYASHI Masaki  Kyusyu Univ., Mech.Engng., Research Asoc., 工学部, 助手 (90037789)
NOGUCHI Hiroshi  Kyusyu Univ., Mech.Engng., Asoc.Professor, 工学部, 助教授 (80164680)
YAMAMOTO Yuuji  Kyusyu Univ., Mech.Engng., Professor, 工学部, 教授 (10037997)
Project Period (FY) 1992 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥31,000,000 (Direct Cost: ¥31,000,000)
Fiscal Year 1994: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1993: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1992: ¥28,000,000 (Direct Cost: ¥28,000,000)
KeywordsFatigue life / Hard disk / Head crash / Friction / Elasto-plastisity / Triangular pyramidal indentation / Young's modulus / Thin film / トライボロジ
Research Abstract

(1) In order to evaluate the relative quality of hard disks, two testing methods are introduced in this study : a continuous sliding test and an in-situ reversal pin-on-disk test. These two methods enable one to compare the relative quality of a head-disk interface in a short period of time. The process leading to failure of the hard disk is clearly fatigue. Above a certain critical load, damage occurs easily and quickly. The lubricant layr can have an adverse effect on fatigue life at low sliding speed. It also affects the stability of the frictional coefficient.
(2) A particular formulation of the three-dimensional finite-element method is established for the elastic-plastic analysis of a triangular pyramidal indentation. The calculated results are in good agreement with the experimental results. It is shown that the loading portion of the caluculated load-displacement curves can be correlated with Vickers hardness, and the unloading portion, with Young's modulus.

Report

(4 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] E.M.Coudert: "DURABILITY TEST AND DAMAGE EVALUATION OF HARD DISKS" Material Science Research International. 1. 37-43 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Y.Murakami: "Elastic analysis of triangular pyramidal indentation by the finite-element method and its application to nano-indentation measurement of glasses" PHILOSOPHICAL MAGAZINE A. 69. 1131-1153 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] E.M.Coudert and Y.Yurakami: "DURABILITY TEST AND DAMAGE EVALUATION OF HARD DISKS" Material Science Research International. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Y.Murakami, K.Tanaka, M.Itokazu and A.Shimamoto: "Elastic analysis of triangular pyramidal indentation by the finite-element method and its application to nano-indentation measurement of glasses" PHILOSOPHICAL MAGAZINE,A. 69-6. 1131-1153 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] E.M.Coudert: "DURABLLITY TEST AND DAMAGE EVALUATION OF HARD DISKS" Material Science Research International. 1. (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Y.Murakami: "Elastic analysis of triangular pyramidal indentation by the finite-element method and its application to nano-indentation measurement of glasses" PHILOSOPHICAL MAGAZINE A.69. 1131-1153 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 村上敬宜: "Damage of Hard Disks in Continous Sliding Test" 日本材料学会第7回破壊力学シンポジウム 講演論文集. 123-126 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 村上 敬宜,糸数 真哉,田中 紘一: "有限要素法による三角すい圧子の弾性押込み解析" 日本機械学会論文集A編. 559. (1993)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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