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Studies of the Fatigue Failure Mechanism for Composite Laminates.

Research Project

Project/Area Number 08405062
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Aerospace engineering
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

KUNOO Kazuo  Kyushu University, Faculty of Engineering, Professor, 工学部, 教授 (90128009)

Co-Investigator(Kenkyū-buntansha) SAKAI Masahiro  Muroran Institute of Technology, Department of Mechanical Systems Engineering, A, 工学部, 助手 (20301963)
ONO Kousei  Kyushu University, Faculty of Engineering, Assistant Professor, 工学部, 助手 (90038092)
UDA Nobuhide  Kyushu University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (20160260)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥40,200,000 (Direct Cost: ¥40,200,000)
Fiscal Year 1998: ¥5,800,000 (Direct Cost: ¥5,800,000)
Fiscal Year 1997: ¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 1996: ¥29,000,000 (Direct Cost: ¥29,000,000)
KeywordsComposite Meterials / Fatigue / Delaminations / ultrasonic NDT / Failure / Failure mode / PEEK matrix / Epoxy matrix / 超音波探傷 / レーザスペックル
Research Abstract

We found that the maximum accumulated strain for PEEK matrix composite laminates [+30/-30] _<4s> subjected to zero-tension cyclic loadings, 85%, 80% and 75% of static strength was about 3.9% at failure. From the experimental results, S-N, (Stress-Number of Cycles) relations can be expressed by linearity in log-log coordinates. The static strength of [+30/-30] _<4s> was about two times that of [+304/-304] _s in the case of PEEK.The difference comes from failure modes in fatigue tests.
We clarified the fatigue failure mechanisms of quasi-isotropic composite laminates subjected to cyclic loadings in several different directions or different matrices. In the case of angle-ply laminates subjected to zero-tension cyclic loadings, the stress-strain relations showed accumulation of strains, so called a mechanical ratchet phenomenon. Fatigue failure was observed as delaminations among laminae by ultrasonic NDT.The progress of fatigue failure is dependent on stacking sequences, for example, the failure of [+theta/-theta]_<4s>. advanced gradually, and the failure of [+theta_4/-theta_4]_5 progressed rapidly. We derived the constitutive relations of mechanical ratchet phenomenon and showed their satisfactory agreement with experimental results. We also investigated the fatigue failure processes of quasi-isotropic laminates, [+30/-30/90]_s, [+30_2/-30_2/90_2]_s, [-45/+45/0/90]_s, [-45_2/+45_2/0_2/90_2]_s and [-45_3/+45_3/0_3/90]_s under cyclic loadings.

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report

Research Products

(18 results)

All Other

All Publications (18 results)

  • [Publications] 小野幸生: "き裂長さ測定用電気ポテンシャル法の開発" 九州大学工学集報. 第72巻・第1号. 15-21 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 境 昌宏: "一定荷重振幅繰返し負荷を受ける斜交対称積層板の低サイクル疲労挙動" 九州大学工学集報. 71巻,3号. 181-188 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 境 昌宏: "斜交対称積層板の静的引張特性に及ぼすマトリックス,繊維配向角および積層順序の影響" 九州大学工学集報. 71巻,3号. 173-180 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Uda: "Tensile Fatigue Damage of Quasi-Isotropic Composite Laminates Loaded in Different Directions" Proceedings of the Second Asian-Pacific Conference of Aerospace Technology and Science. 355-360 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Kunoo: "Fatigue Failure Mechanism in Angle-Ply Laminates" Proceedings of the Second Asian-Pacific Conference of Aerospace Technology and Science. 361-368 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Sakai: "Low Cycle Fatigue Behavior of Symmetric Angle-Ply AS4/PEEK Laminate" Technology and Applied Mechanics. vol.46. 125-130 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ono: "Development of Electrical Potential Method for Crack Length Measurement" Technology Reports of Kyushu University. Vol.72. 15-21 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Sakai: "Influence of Matrix Resin, Fiber Orientation and Stacking Sequence on Static Tensile Properties of Symmetric Angle-Ply Laminate" Technology Reports of Kyushu University. Vol.71. 173-180 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Sakai: "The Low Cycle Fatigue Behavior of Symmetric Angle-Ply Laminate under Cyclic Loading at Constant Load Amplitude" Technology Reports of Kyushu University. Vol.71. 181-188 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Uda: "Tensile Fatigue Damage of Quasi-Isotropic Composite Laminates Loaded in Different Directions" Proceedings of the Second Asian-Pacific Conference of Aerospace Technology and Science. 355-360 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Kunoo: "Fatigue Failure Mechanism in Angle-Ply Laminates" Proceedings of the Second Asian-Pacific Conference of Aerospace Technology and Science. 361-368 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Sakai: "Low Cycle Fatigue Behavior of Symmetric Angle-Ply AS4/PEEK Laminate" Theoretical and Applied Mechanics. vol.46. 125-130 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 小野幸生: "き裂長さ測定用電気ポテンシャル法の開発" 九州大学工学集報. 72・1. 15-21 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 境昌宏: "一定過重振幅繰返し負荷を受ける斜交対称積層板の低サイクル疲労挙動" 九州大学工学集報. 71・3. 181-188 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 境昌宏: "斜交対称積層板の静的引張特性に及ぼすマトリックス,繊維配向角および積層順序の影響" 九州大学工学集報. 71・3. 173-180 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] N.Uda: "Tensile Fatigue Damage of Quasi-Isotropic Composite Laminates Loaded in Different Directions" Proceedings of the Second Asian-Pacific Conference of Aerospace Technology and Science. 355-360 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Kunoo: "Fatigue Failure Mechanism in Angle-Ply Laminates" Proceedings of the Second Asian-Pacific Conference of Aerospace Technology and Science. 361-368 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] M.Sakai: "Low Cycle Fatigue Behavior of Symmetric Angle-Ply AS4/PEEK Laminate" Theoretical and Applied Mechanics. vol.46. 125-130 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1996-03-31   Modified: 2016-04-21  

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