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Quick estimating method of giga-cycle fatigue properties by an intermittent ultrasonic loading

Research Project

Project/Area Number 13650082
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

ISHII Hitoshi  Shizuoka University, Mechanical Engineering, Professor, 工学部, 教授 (90022235)

Co-Investigator(Kenkyū-buntansha) ARAKI Hiroyasu  Shizuoka University, Mechanical Engineering, Assistant, 工学部, 助手 (60115433)
TOHGO Keiichiro  Shizuoka University, Mechanical Engineering, Professor, 工学部, 教授 (10155492)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2001: ¥3,000,000 (Direct Cost: ¥3,000,000)
KeywordsUltrasonic fatigue / Intermittent ultrasonic loading / Giga-cycle fatigue / High Strength steel / Subsurface crack nucleation / Inclusion / Case hardening steel / Notched specimen / 高強度網 / 浸炭処理網 / P-S-N線図
Research Abstract

S-N curves of the materials with various strength steels were determined up to the giga-cycle regime by an intermittent ultrasonic fatigue method, and the results were compared to those obtained by a conventional method. The usefulness of this method as a quick determination of the fatigue strengths was confirmed. The reason of applying ultrasonic wave train intermittently (pulsed mode) was to avoid temperature raise of the specimen by heat generation due to very high cyclic deformation. No effect of the duty-pause period on the fatigue properties in the very high cycle regime above 10^7 cycles was observed as long as no heat raise occurs in the specimen, and the following results were obtained by using 30 ms duty period and 70 ms pause period. P-S-N diagrams up to the giga-cycle regime were obtained on the S35C and SNCM439 tempered at high temperature by using 150 test pieces. Thus obtained P-S-N diagrams show quite good correlation with the results in the data book by JSMS or NRIM. Furthermore, the S-N curves of the maraging steels, which exhibit no endurance limit, were obtained up to the giga-cycle regime. In the specimens fractured below 10^7 cycles, crack initiation was always from the surface, while it was at subsurface initiation from the inclusions in the specimens survived more than 10^7 cycles. Improvement of the high cycle fatigue properties was achieved by reforming the inclusion size through manufacturing process. Such results that usually take a few years to obtain by a conventional method can be obtained within a few months and it is shown that this method is a powerful tool for developing new materials. Success applications were also made to the bearing steel of SUJ2 and the case hardening steels of SCr220 and SNCM 420 and to the notched specimen.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] Hitoshi Ishii, Kazufumi Yamanaka, Keiichiro Tohgo: "Giga-cycle Fatigue Strengths in Some High Strength Steel by Ultrasonic Fatigue Testing"Materials Science Research International. STP-1. 59-63 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hitoshi Ishii, Tooru Yagasaki, Hirofumi Akagi: "Evaluation of giga-cycle fatigue properties of some maraging steels by intermittent ultrasonic loading"Fatigue and Fracture of Engineering Materials and Structures. 25. 831-835 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hitoshi Ishii, Torinori Kumagai, Atsushi Takahashi: "Giga-cycle Fatigue Properties of Carburized and Water Jet Peened Case Hardening Steels"9th International Conference on the Mechanical behavior of Materials. (発行予定). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hitoshi Ishii, Yohei Tagchi, Kazuo Ishii, Hirofumi Akagi: "Ultrasonic bending fatigue testing method for thin sheet materials"International Conference on Advanced Technology in Experimental Mechanics '03. (発行予定). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hitoshi Ishii, Kazufumi Yamanaka and Keiichiro Tohgo: "Giga-cycle Fatigue Strengths in Some High Strength Steel by Ultrasonic Fatigue Testing"Materials Science Research International. STP-1. 59-63 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hitoshi Ishii, Tooru Yagasaki and Hirofumi Akagi: "Evaluation of giga-cycle fatigue properties of some maraging steels by intermittent ultrasonic loading"Fatigue and Fracture of Engineering Materials and Structures. 25, 8-9. 831-835 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hitoshi Ishii, Yorinori Kumagai and Atsushi Takahashi: "Giga-cycle Fatigue Properties of Carburized and Water Jet Peened Case Hardening Steels"9th International Conference on the Mechanical Behavior of Materials. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hitoshi Ishii, Yohei Taguchi, Kazuo Ishii and Hirofumi Akagi: "Ultrasonic bending fatigue testing method for thin sheet materials"International Conference on Advanced Technology in Experimental Mechanics '03. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hitoshi Ishii, Kazufumi Yamanaka, Keiichiro Tohgo: "Giga-cycle Fatigue Strengths in Some High Strength Steel by Ultrasonic Fatigue Testing"Materials Science Research International. STP-1. 59-63 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] Hitoshi, Ishii, Tooru Yagasaki, Hirofumi Akagi: "Evaluation of giga-cycle fatigue properties of some maraging steels by intermittent ultrasonic loading"Fatigue and Fracture of Engineering Materials and Structures. 25,8-9. 831-835 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Hitoshi Ishii, Yorinori Kumagai, Atsushi Takahashi: "Giga-cycle Fatigue Properties of Carburized and Water Jet Peened Case Hardening Steels"9th International Conference on the Mechanical behavior of Materials. (CD-ROM). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Hitoshi Ishii, Yohei Taguchi, Kazuo Ishii, Hirofumi Akagi: "Ultrasonic bending fatigue testing method for thin sheet materials"International Conference on Advanced Technology in Experimental Mechanics '03. (発表予定). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Hitoshi Ishii: "Evaluation of giga-cycle fatigue properties of some maraging steels by intermittent ultrasonic fatigue testing"Proceeding of the International Conference on Fatigue in the very High Cycle Regime. 89-96 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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