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2005 Fiscal Year Final Research Report Summary

Study on the mechanism of internal fracture process and establishment of reliable method for fatigue design in very high cycle fatigue regime

Research Project

Project/Area Number 15560065
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionUniversity of Toyama

Principal Investigator

SHIOZAWA Kazuaki  University of Toyama, Faculty of Engineering, Professor, 工学部, 教授 (90019216)

Co-Investigator(Kenkyū-buntansha) NISHINO Seiichi  University of Toyama, Faculty of Engineering, Associate Professor, 工学部, 助教授 (00218174)
Project Period (FY) 2003 – 2005
KeywordsVery high cycle fatigue / Internal crack / Crack initiation and propagation / Fractography / Computer simulation / Non-metallic inclusion / Carbide / High strength steel
Research Abstract

A remarkable shape of S-N curve, named as a duplex S-N curve, was appeared from the fatigue tests using specimens of high-strength steel. The S-N curve consists of two different S-N curves corresponding to the respective fracture mode : One of the two S-N curves appears at a high-stress amplitude level and low number of cycles, and is governed by a surface fracture mode as a result of the surface crack initiation and propagation. The other S-N curve appears at a high number of cycles and is governed by internal crack initiation and propagation. A distinctive feature was observed in the vicinity of a non-metallic inclusion at the fracture origin inside the fish-eye on fracture surfaces resulting from subsurface crack initiation and growth in a high-cycle fatigue regime. This area revealed a very rough and granular morphology in comparison with the area inside the fish-eye and named a "GBF (granular-bright-facet)" by authors. It is very important for the establishment of a reliable and s … More afe fatigue design for mechanical elements to clarify the mechanism of internal fatigue fracture in long-life fatigue regime. The main aim of this study was to clarify the mechanism of the formation of a GBF area in the vicinity of an inclusion. Detailed observations and analysis of a fracture surface by a three-dimensional SEM and SPM, and computational simulation of the fracture process by FRASTA were conducted. Results obtained in this study are as follows.
1.The roughness in a GBF area was very large compared with the surface outside the GBF, and of similar size to the fine spherical carbide particles in the microstructure of the tested materials. In addition, the size and distribution of convex particles in the GBF area corresponds to those of carbide particles in the microstructure of the tested materials.
2.Rich carbon distribution in the GBF area, compared with that outside the GBF, was detected by EPMA. It was inferred that the formation of the rough and granular fracture surfaces in the GBF area relate to fine carbide particles in the microstructure.
3.From the computational simulation using the FRASTA method, multiple microcracks are dispersed in the vicinity of an inclusion, grow, and then coalesce with each other under a very high cycle fatigue regime.
4.The mechanism of GBF formation in a very high cycle fatigue regime was proposed as the "Dispersive Decohesion of Spherical Carbide Model". This model was confirmed to come into existence for steel that contains different carbon percentage and for specimen obtained from not only rotary-bending fatigue test but also axial loading fatigue test. Less

  • Research Products

    (29 results)

All 2006 2005 2004 2003

All Journal Article (28 results) Book (1 results)

  • [Journal Article] Subsurface crack initiation and propagation mechanism under the super-long fatigue regime for high speed tool steel (JIS SKH51)by fracture surface topographic analysis2006

    • Author(s)
      K.Shiozawa
    • Journal Title

      JSME Inter.Jour., Series A 49・1

      Pages: 1-10

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Subsurface crack initiation and propagation mechanism in high-strength steel in a very high cycle fatigue regime2006

    • Author(s)
      K.Shiozawa
    • Journal Title

      Int.Jour.Fatigue (掲載予定)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Subsurface crack initiation and propagation mechanism under the super-long fatigue regime for high speed tool steel (JIS SKH51) by fracture surface topographic analysis2006

    • Author(s)
      K.Shiozawa
    • Journal Title

      JSME Inter.Jour., Series A Vol.49, No.1

      Pages: 1-10

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Subsurface crack initiation and propagation mechanism in high-strength steel in a very high cycle fatigue regime2006

    • Author(s)
      K.Shiozawa
    • Journal Title

      Int.Jour.Fatigue (to be published)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Fatigue fracture process of a high carbon-chromium bearing steel in ultra-long life regime2005

    • Author(s)
      L.Lu
    • Journal Title

      Proc. of the 2^<th> National Symposium On the Reliability of Materials and Structures

      Pages: 69-74

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Fatigue fracture process of a high carbon-chromium bearing steel in ultra-long life regime2005

    • Author(s)
      L.Lu
    • Journal Title

      Proc.of the 21^<st> National Symposium on the Reliability of Materials and Structures

      Pages: 69-74

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] SKH51鋼の超長寿命域の疲労における内部疲労き裂発生・進展機構に関する破面解析的検討2004

    • Author(s)
      塩澤和晃
    • Journal Title

      日本機械学会論文集, A編 70・691

      Pages: 495-503

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Subsurface crack in itiation and propagation mechanism of high-strength steel in very high cycle fatigue regime2004

    • Author(s)
      K.Shiozawa
    • Journal Title

      Proc.of the Third International Conference on Very High Cycle Fatigue (VHCF-3)

      Pages: 85-92

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Effect of two-step load variation on gigacycle fatigue and internal crack growth behavior of high-carbon-chromium bearing steel2004

    • Author(s)
      L.Lu
    • Journal Title

      Proc. of the Third International Conference on Very High Cycle Fatigue (VHCF-3)

      Pages: 185-192

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Effect of tempering temperature on super-long fatigue behavior of low alloy steel, SNCM 4392004

    • Author(s)
      K.Shiozawa
    • Journal Title

      Proc. of the Third International Conference on Very High Cycle Fatigue (VHCF-3)

      Pages: 609-616

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 超音波後方散乱波のウエーブレット解析による材料欠陥評価2004

    • Author(s)
      西野精一
    • Journal Title

      日本機械学会論文集, A編 70・700

      Pages: 1772-1777

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 高強度鋼の超長寿命域の疲労特性〜内部き裂発生・進展のトポグラフィ破面解析〜(解説)2004

    • Author(s)
      塩澤和章
    • Journal Title

      検査技術(日本工業出版)

      Pages: 10-17

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Subsurface crack initiation and propagation mechanism in the super-long fatigue regime for high speed tool steel, JIS SKH512004

    • Author(s)
      K.Shiozawa
    • Journal Title

      Trans.of the Japan Soc.of Mech.Eng. Vol.70, No.691

      Pages: 495-503

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Improvement of fretting fatigue strength in Ni-Cr-Mo alloy steel by WC-Co spraying2004

    • Author(s)
      M.Okane
    • Journal Title

      Proc.of Indo Japan Conf.on Damage Tolerant Design and Materials

      Pages: 179-185

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Subsurface crack initiation and propagation mechanism of high-strength steel in very high cycle fatigue regime2004

    • Author(s)
      K.Shiozawa
    • Journal Title

      Proc.of the Third International Conference on Very High Cycle Fatigue (VHCF-3)

      Pages: 85-92

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Effect of two-Step Load Variation on Gigacycle Fatigue and Internal Crack Growth Behavior of High-Carbon-Chromium Bearing Steel2004

    • Author(s)
      L.Lu
    • Journal Title

      Proc.of the Third International Conference on Very High Cycle Fatigue (VHCF-3)

      Pages: 185-192

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Effect of Tempering Temperature on Super-Long Fatigue Behavior of Low Alloy Steel, SNCM 4392004

    • Author(s)
      K.Shiozawa
    • Journal Title

      Proc.of the Third International Conference on Very High Cycle Fatigue (VHCF-3)

      Pages: 609-616

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Evaluation of small defects by wavelet analysis of scattering ultrasonic2004

    • Author(s)
      S.Nishino
    • Journal Title

      Trans.of the Japan Soc.of Mech.Eng. Vol.70, No.700

      Pages: 495-503

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 高速度工具鋼SKH51の超長寿命疲労挙動と破壊形態2003

    • Author(s)
      魯 連涛
    • Journal Title

      日本機械学会論文集, A編 69・679

      Pages: 662-670

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 高速度工具鋼SKH51の超長寿命域の疲労挙動に及ぼす表面処理の影響2003

    • Author(s)
      魯 連涛
    • Journal Title

      日本機械学会論文集, A編 69・684

      Pages: 31195-1202

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] トポグラフィ破面解析による高強度鋼の内部疲労き裂発生・進展機構に関する研究2003

    • Author(s)
      塩澤和晃
    • Journal Title

      材料 52・11

      Pages: 1311-1317

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 高炭素クロム軸受鋼の超長寿命疲労強度に及ぼす表面層の影響2003

    • Author(s)
      魯 連涛
    • Journal Title

      構造物の安全性および信頼性(JCOSSAR2003)論文集 5

      Pages: 427-434

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Gigacycle fatigue behavior and fracture morphology of high speed tool steel, JIS SKH512003

    • Author(s)
      L.Lu
    • Journal Title

      Trans.of the Japan Soc.of Mech.Eng. Vol.69, No.679

      Pages: 662-670

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Effect of surface treatment on super-long-life fatigue behavior in high speed tool steel, JIS SKH512003

    • Author(s)
      L.Lu
    • Journal Title

      Trans.of the Japan Soc.of Mech.Eng. Vol.69, No.684

      Pages: 1195-1202

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] A study of subsurface crack initiation and propagation mechanism of high=strength steel by fracture surface topographic analysis2003

    • Author(s)
      K.Shiozawa
    • Journal Title

      Jour.of the Soc.of Mat.Sci., Japan Vol.52, No.11

      Pages: 1311-1317

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Effect of surface layer on super-long-life fatigue behavior in high carbon-chromium bearing steel2003

    • Author(s)
      L.Lu
    • Journal Title

      Proc.JCOSSAR 2003 Vol.5

      Pages: 427-434

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Mechanism for subsurface fatigue crack initiation and propagation of high-strength steels in super-long-life fatigue regime2003

    • Author(s)
      K.Shiozawa
    • Journal Title

      Proc.JCOSSAR 2003 Vol.5

      Pages: 447-452

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Surface treatment-1 ; Characteristics of fatigue behavior of surface modified materials (Chapter 5)2003

    • Author(s)
      K.Shiozawa
    • Journal Title

      Macro and Microscopic Approach to Fracture (Ed.By S-I.Nishida)(WIT Press)

      Pages: 117-170

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] Macro and Microscopic Approach to Fracture : Surface treatment-1 ; Characteristics of fatigue behavior of surface modified materials (Chapter5)(Ed.By S-I.Nishida)2003

    • Author(s)
      K.Shiozawa
    • Total Pages
      328(117-170)
    • Publisher
      WIT Press
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2007-12-13  

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