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1995 Fiscal Year Final Research Report Summary

Study on Prediction and Monitoring Technique of Failure of Gear Teeth by Means of AE Method

Research Project

Project/Area Number 05650145
Research Category

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

Allocation TypeSingle-year Grants
Research Field 設計工学・機械要素・トライボロジー
Research InstitutionTottori University

Principal Investigator

MIYACHIKA Kouitsu  Faculty of Eng., Tottori Univ., Assoc.Prof, 工学部, 助教授 (30157664)

Co-Investigator(Kenkyū-buntansha) KOIDE Takao  Faculty of Eng., Tottori Univ., Assoc.Prof., 工学部, 助教授 (60127446)
ODA Satoshi  Faculty of Eng., Tottori Univ., Professor, 工学部, 教授 (50032016)
Project Period (FY) 1993 – 1995
KeywordsGear / Acoustic Emission / Gear Failure / Bending Fatigue Failure / AE Cumulative Event Count / AE Cumulative Energy Count / Crack Length / Frequency Analysis
Research Abstract

Research was conducted on AE signals, AE cumulative event count, AE event count rate, AE cumulative energy count, AE energy rate, AE amplitude, frequency spectra of AE signals and crack propagation in the bending fatigue process of SCM415 case-hardened, S45C normalized, two kinds of ADI [astempered ductile iron, ADI1 : T_<LAMBDA> = 875゚C,T_I = 375゚C,ADI2 : T_<LAMBDA> = 875゚C,T_I = 235゚C,(T_<LAMBDA> : temperature of austemper treatment, T_I : temperature of isothermal transformation)] and SACM645 ion-nitrided gear teeth under different tooth loads. The relationship between the AE parameters and the fatigue crack propagation as well as the effects of the gear material and the tooth load on the AE characteristics in the bending fatigue process were determined. Basic data were obtained for the prediction and the diagnosis of bending fatigue failure of the gear tooth by means of AE method.
The main results obtained from this investigation are summarized as follows.
1. AE cumulative event coun … More t and AE cumulative energy count in the bending fatigue process of gear teeth increase markedly just before the crack initiation and become almost constant in the crack growth in the cases of the case-hardened and the ADI1 gear. In the case of the ion-nitrided gear, the change of these AE parameters in the fatigue process shows the same tendency as the case of the case-hardened gear, but the increasing rate is considerably smaller than in the case of the case-hardened gear. In the case of the ADI2 gear, these AE parameters increase after the crack initiation. In the case of the normalized gear, the changes of these AE parameters with the crack initiation can hardly be observed. Hence, the prediction of the crack initiation using these AE parameters is possible in the cases of the case-hardened, the ADI1 and the ion-nitrided gear, but difficult in the cases of the ADI2 and the normalized gear. 2.AE amplitudes in the bending fatigue process of the case-hardened, the ADI1 and the ion-nitrided gear are small in the early stage of the fatigue process, become larger just before the crack initiation, smaller in the crack growth and larger just before the tooth breakage. In the case of the ADI2 gear, AE amplitude becomes larger after the crack initiation. In the case of the normalized gear, AE signals with large amplitude can not be almost observed. 3. Maximum amplitudes of AE signals in the bending fatigue process of the ion-nitrided, the case-hardened, the ADI and the normalized gear tooth become smaller in the order mentioned. Less

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 宮近幸逸: "Acoustic Emission in Bending Fatigue Process of Spur Gear Teeth" PROGRESS in ACOUSTIC EMISSION VII Proceedings of the 12th International Acoustic Emission Symposium. 283-288 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 宮近幸逸: "Acoustic Emission of Bending Fatigue Process of Spur Gear Teeth" JOURNAL OF ACOUSTIC EMISSION. VoL. 13 NOS. 1-2. S47-S53 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 坪倉公治: "イオン窒化歯車の曲げ疲労損傷のAE特性" 日本機械学会講演論文集. 965-1. 233-234 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miyachika, Kouitsu: "Acoustic Emission in Bending Fatigue Process of Spur Gear Teech" PROGRESS in ACOUSTIC EMISSION VII, Proceedings of the 12th International Acoustic Emission Symposium. 283-288 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Miyachika, Kouitsu: "Acoustic Emission of Bending Fatigue Process of Spur Gear Teeth" JOURNAL OF ACOUSTIC EMISSION. Vol.13, Nos.1-2. S47-53 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tsubokura, Kouji: "Acoustic Emission in Bending Fatigue Process of Ion-Nitrided Gears" Prepr.of Jpn.Soc.Mech.Eng.Vol.965-1. 233-234 (1996)

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

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Published: 1997-03-04  

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