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Introduction of Cnack-arrest Mechanism in Fiber Composites

Research Project

Project/Area Number 07555491
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Composite materials/Physical properties
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

OCHIAI Shojiro  KYOTO UNIVERSITY,Faculty of Engineering, Professor, 工学部, 教授 (30111925)

Co-Investigator(Kenkyū-buntansha) MORIMOTO Hiroyuki  Kobe Steel, Research Center for Materials, Chief Researcher, 材料研究所, 主任研究員
NOGUCHI Kenichi  Toray, Research center for compocite Head, Researche, 複合材料研究所, 主席研究員
HOJO Masaki  KYOTO UNIVERSITY Faculty of Engineering, Associate Professo Head, 工学部, 助教授 (70252492)
Project Period (FY) 1995 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1997: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1996: ¥2,400,000 (Direct Cost: ¥2,400,000)
Keywordscomposite / fiber / interface / strength / fracture / crack / Microstructural Control / coating / シミュレーション / マトリックス / 靱性 / 疲労
Research Abstract

For practical application of advanced composite materials, further improvement of mechanical property and reliability are needed. In the present study, it was intended to introduce crack-arrest mechanism in fiber-composites for siliconcarbide fiber reinf orced titaniumaluminide intermetallic compound and siliconcarbide fiber reinofrced BMAS (crystallized glass) from theoretical and experimental standpoints. Main results are summarized as follows.
(1) The energy release rate for mode I crack decreases rapidly with increasing debonding length. From this and related study, it was clarifoed that even the debonding length comparable to several times of the fiber diameter is very affective to arrest Mode I crack propagation.
(2) The condition for the debonding to occur prior to the crack extension was studied from fracture mechanical approach, from which it was shown that controling the interface as to be have the mode II type energy release rate less than 0.3 times the energy release rate for mode I crack.
(3) The interfacial debonding grows unstably when the volume fraction of fiber is low but stably in the early stage when it is high.
(4) The influences of residula stress and frictional shear stress at the debonded interface on interfacial debonding in mulitifiber composites were clarified. A new approch to describe the fracture behavior of composites with residula stresses was developed.
(5) The effects of double and gradient coatings on fiber on crack-arrest was clarified. Also it was shown that multiple cracking can be utilized for crack-arrest since the enrgy release rate at the crack tip in mode I can be reduced by reduction in crack-spacing.
(6) The crack-arrest conditions for several composite systems which are promising for industrial application were derived.

Report

(4 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] S.Ochiai: "A shear Lay Approach to the Early stage of Interfacial Failure in the Fiber Direction in Notched Two-dimensional composites" Composite Science and Technology. 57. 775-785 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ochiai: "Influences of Residual Stresses,Frictional shear stress at Debonded Interface and Interactions on Interfacial Debonding" Composite Interfaces. (印刷中). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ochiai: "Effect of pre-existent crack in Double and Gradient Coathings on the Crack-extension into Fiber and Interfacial Debonding" Journal of Materials Science. (印刷中). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ochiai: "Necessary Conditions to Minimize The Reduction in Fiber Strength" Proceedings of International Conference on Advanced Materials. (印刷中). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ochiai et al: "A Shear Lag Approach to The Early Stage of Interfacial Failure in The Fiber Direction in Notched Two-dimensional Composites" Composite Science and Technology. Vol.57. 775-785 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ochiai et al: "Influences of Residual Stresses, Frictional Shear Stress at Debonded Interface and Interactions on Interfacial Debonding" Composite Interface. (in Press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ochiai et al: "Effect of Pre-existent Crack in Double andGradient Coatings on The Crack-extension intoFiber and Interfacial debonding" Journal of Materilas Science. (in Press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ochiai et al: "Necessary Conditions to Minimize The Reduction in Fiber Strength" Proceedings of International Conference on Advanced Materials. (in Press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ochiai: "A Shear Lag Approach to the Early Stage of Interfacial Failure in the Fiber Direction in Notched Two-dimensional Composites" Composite Science and Technology. 57・5. 775-785 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.Ochiai: "Influences of Residual Stresses Frictional Shear Stress at Debonded Interface and Interactions on Interfacial clebonding" Composite Interfaces. (印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.Ochiai: "Effect of Pre-existent Crack in Double and Gradient Coatings on the crack-extension into Fiber and Interfacial debonding" Journal of Materials Science. (印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.Ochiai: "Necessary Conditions to minimize the Reduction in Fiber Strength" Proceedings of Internaltional Conference on Advanced Materials. (印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.Ochiai: "Reduction in Energy Release Rate for ModeI Frecture of Fiber with a cracked Coating Layer due to Small Scale Interfacial Debonding" Journal of Moterials Science. 31・8. 2027-2034 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] S.Ochiai: "Role of Weale Interface to Retain High Strength of Fiber in Monofilamentary SiC Fiber/Titanum Aluminide Composite" Composite Interfaces. 4・3. 157-168 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Shojiro Ochiai: "Nb_3Sn tensile strength and its distribution estimated from change in superconducting critical current of preloaded multifilamentary composite wire" Cryogenics. No. 5 Vol. 35. 55-60 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Shojiro Ochiai: "Multiple cracking of a coating layer and influence on fibre strength Part 1 Calculation of the energy release rate of the fiber at cracks for non-uniform crack spacing" Journal of Materials Science. Vol. 30. 274-279 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Shojiro Ochiai: "Multiple cracking of a coating layer and its influence on fibre strength Part 2 Monte Carlo simulation" Journal of Materials Science. Vol. 30. 509-513 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Shojiro Ochiai: "Temperature-Dependence Mechanism of Tensile Strength of Si-Ti-C-O Fiber-Aluminum Matrix Composites" Metallurgical and Materials Transactions A. No. 3 Vol. 26A. 647-652 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 落合庄治郎: "Nb_3Sn多芯超電導複合線材の臨界電流に及ぼす予荷重効果" 低温工学. No. 6 Vol. 30. 285-291 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Shojiro Ochiai: "Relation of the strength distribution of Nb_3Sn to the critical current of a pre-stressed multifilamentary composite superconductor" Superconductor Science and Techonology. Vol. 8. 863-869 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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