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Co-Operative Research on Fatigue Failure at Contact Surface

Research Project

Project/Area Number 60302043
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field 機械要素
Research InstitutionKyushu University

Principal Investigator

ICHIMARU Kazunori  Kyushu University, Professor, 工学部, 教授 (60037760)

Co-Investigator(Kenkyū-buntansha) NAKAJIMA Akira  Saga University, Associate Professor, 理工学部, 助教授 (60039295)
KANEDA Motohiro  Kyushu Institute of Technology, Professor, 工学部, 教授 (90039123)
URA Akira  Nagasaki University, Professor, 工学部, 教授 (40037825)
MURAKAMI Teruo  Kyushu University, Associate Professor, 工学部, 助教授 (90091347)
YAMAMOTO Yuji  Kyushu University, Professor, 工学部, 教授 (10037997)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥5,300,000 (Direct Cost: ¥5,300,000)
Fiscal Year 1986: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1985: ¥4,600,000 (Direct Cost: ¥4,600,000)
KeywordsSurface Fatigue / Pitting / Fretting Fatigue / Gear Failure / Two-roller Test / Asperity Interaction / 三次元粗さ解析
Research Abstract

In order to clarify the mechanism of surface fatigue in contact, two-roller test, three dimensional rolling contact test (simulated the contact condition of rail and wheel), fretting test and repetitive compression test were conducted. By two roller tests, following conclusions were obtained: (1) Asperity interaction of surface roughness is most important factor for occurrence of rolling fatigue, i. e., pitting, micro pitting and spalling. (2) In especial, the running-in condition is controlled by the asperity contact frequency Naf, defined by the number of contact positions of higher hardness roller with different microgeometries which are brought into contact with any one position of mating lower hardness roller, and Naf controls the severity of asperity contact and the occurrence of rolling fatigue. (3) The rolling fatigue limits under severe asperity contacts are determined by the limiting Hertzian pressure where running-in occurs or not. (4) Micro-Pitting of carburized steel are c … More ontrolled by the value of roughness which is limit of occurrence of running-in. By fretting tests, it was clarified that the tangential traction have an influence on the contact fatigue by promoting the occurrence of tensile stresses which always appear in three dimensional contacts, owing to macro geometrical condition or micro asperity contacts. The occurrences of fatigue cracks in the macro geometrical three dimensional contact (i. e. the simulated rail-and-wheel contact) and the repetitive compression tests certify above conclusion. The gear tests and the repetitive compression tests also showed that particles of solid, e. g. the particles of solid lubricants contained in gear oil, are possible to be the sources of stress concentrations, and therefore it should be small enough. By the analysis of cracking from the failure mechanics, the propagations of cracks were predicted. Furthermore, it was shown that the running-in condition or the severity of asperity contacts can be estimated from the cross-corelation function of roughness profile measured three-dimensionally. Less

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 市丸和徳: 潤滑. 30. 703-708 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 市丸和徳,木下和久ほか: 日本機械学会論文集C編. 52. 1065-1071 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 市丸和徳,木下和久ほか: 潤滑. 31. 336-342 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 兼田〓宏ほか: 潤滑. 31. 332-328 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 兼田〓宏ほか: 潤滑. 31. 429-436 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 中島晃ほか: 日本機械学会論文集C編. 52. 764-769 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Kazunori ICHIMARU: "Problems and Recent Studies on Rolling Fatigue" Jounal of Japan Society of Lubrication Engineers. 30. 703-708 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Kazunori ICHIMARU, et al.: "Effect of Height Distribution Characteristics on EHL Film-Formation in Spur Gears" Jounal of Japan Society of Lubrication Engineers. 31. 336-342 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Kazunori ICHIMARU, et al.: "Relation between Oil-Film-Formation and Vibration-Acceleration in Spur Gear" Transaction of the JSME C. 475. 1065-1071 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Motohiro KANETA, et al.: "Analysis of Surface Cracking in Lubricated Rolling/Sliding Contacts - Comparison between Point and Line Contacts" Jounal of Japan Society of Lubrication Engineers. 31. 322-328 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Akira NAKAJIMA: "Effect of Interacting Frequency on Rolling Fatigue" Transaction of the JSME C. 52. 764-769 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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