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1989 Fiscal Year Final Research Report Summary

An analysis of cyclic stress-strain response correlated with static mechanical properties and development of new method for assessing fatigue life

Research Project

Project/Area Number 62460079
Research Category

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

Allocation TypeSingle-year Grants
Research Field 材料力学
Research InstitutionYamaguchi University

Principal Investigator

HATANAKA Kenji  Yamaguchi Univ., Dept. Mech. Engng., Professor, 工学部, 教授 (60026193)

Co-Investigator(Kenkyū-buntansha) OGAWA Hisashi  Ube Tech. College, Dept. Mech. Engng., Assoc. Professor, 助教授 (10043887)
FUJIMITSU Tatsuro  Yamaguchi Univ., Dept. Mech. Engng., Assoc. Professor, 工学部, 助教授 (70035062)
Project Period (FY) 1987 – 1989
KeywordsCyclic Stress-Strain Response / Notch / Elastic-Plastic Finite Element Method / Fatigue Crack / J-integral Range / Numerical Simulation / Fatigue Life Prediction
Research Abstract

The cyclic stress-strain curve is necessitated to calculate a crack growth rate based on elastic-plastic fracture mechanics and to predict the fatigue life. In view of this, the purpose of the present study is to develop a new method for the numerical simulation of the cyclic stress-strain curve and for the fatigue life assessment based on it. The cyclic stress-strain response of copper was numerically simulated by introducing the dynamic dislocation mechanics. Then, this was applied to the cyclic stress-strain analysis of the circumferentially notched components and to the life estimation. The main results obtained are summarized as follows.
(1),The cyclic stress-strain response was successfully calculated by using the static mechanical properties through the proposed method.
(2) The stress-strain responses of the circumferentially notched components were calculated by means of elastic-plastic finite element method , where the constitutive equation stated in the item (1) was introduced into the F.E.M. calculations.
(3) The change in the shape of the surface crack originated at trie notch root was successfully analyzed in terms of the elastic-plastic fracture mechanics. The transition from the semielliptical to circumferential crack, which occurred at the notch root in the crack extension process under a given test condition, was satisfactorily predicted in the proposed analysis.
(4) The crack initiation life of the circumferentially notched components was evaluated on the basis of the finite element stress analysis. Consequently, it was revealed that the equivalent plastic strain generated at the notch root dominates the crack initiation life of the notched components where the multiaxial stress develops.
(5) The low-cycle fatigue lives of the dully and acutely notched cylinder components were satisfactorily evaluated through the analysis of the growth of the surface and circumferential cracks.

  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 幡中憲治,藤満達朗,白石進: "環状切欠部に生じた表面疲労き裂進展速度に関する弾・塑性破壊力学的解析" 日本機械学会論文集,A編. 55. 681-688 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 幡中憲治,藤満達朗,澄川泰弘: "銅の繰返し硬化挙動の結晶塑性的数値シミュレ-ション" 日本機械学会論文集,A編. 55. 1000-1007 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Hatanaka,T.Fujimitsu,S.Shiraishi: "An Analysis of Surface Crack Growth in Circumferentially Grooved Components under Low-Cycle Fatigue" JSME International Journal,Series I. Vol.32-2. 245-255 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Hatanaka,T.Fujimitsu: "Prediction of Low-Cycle Fatigue Life in Metallic Materials" Proceedings of the III Conference of Asian-Pacific Congress on Strength Evaluation. 555-561 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Hatanaka: "Cyclic Stress-Strain Response and Low-Cycle Fatigue Life in Metallic Materials" JSME International Journal,Series I. Vol.33-1. 13-25 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 幡中憲治,藤満達朗,白石進: "環状切欠部に生じた表面き裂の弾・塑性破壊力学的解析とそれに基づく低サイクル疲労寿命評価" 日本機械学会論文集,A編. 56. 295-303 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Hatanaka T. Fujimitsu S. Shiraishi: "An Analysis of Surface Crack Growth in Circumferentially Notched Specimen Low-Cycle Fatigued" Transactions of the Japan Society of Mechanical Engineers, Vol.55-512, pp.681-688, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Hatanaka T. Fujimitsu Y. Sumigawa: "A Numerical Simulation of Cyclic Hardening in Copper" Transactions of the Japan Society of Mechanical Engineers, Vol.55-512, pp.1000-1007, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Hatanaka T. Fujimitsu S. Shiraishi: "An Analysis of Surface Crack Growth in Circumferentially Grooved Components under Low-Cycle Fatigue" JSME International Journal, Series I Vol.32-2, pp.245-255, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Hatanaka T. Fujimitsu: "Prediction of Low-Cycle Fatigue Life in Metallic Materials" Proceedings of the III Conference of Asian-Pacific Congress on Strength Evaluation pp.555-561, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Hatanaka: "Cyclic Stress-Strain Response and Low-Cycle Fatigue Life in Metallic Materials" JSME International Journal, Series I Vol.33-1, pp.13-25, 1990.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Hatanaka T. Fujimitsu: "Low-Cycle Fatigue Life Prediction of Circumferentially Notched Component" Transactions of the Japan Society of.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Shiraishi: "in Terms of Elastic-Plastic Fracture Mechanics" Mechanical Engineers, Vol.56-522, pp.295-303, 1990.

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

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Published: 1993-03-26  

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