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Fracture Mechanics Approach to the Interaction Between Fiber and Matrix in Composite Materials.

Research Project

Project/Area Number 60550041
Research Category

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

Allocation TypeSingle-year Grants
Research Field Aerospace engineering
Research InstitutionKyushu University

Principal Investigator

TAKAO Yoshihiro  Research Institute for Applied Mechancis, Kyushu University., 応用力学研究所, 助教授 (30108766)

Co-Investigator(Kenkyū-buntansha) FUKUDA Shigehisa  Research Institute for Applied Mechanics, Kyushu University., 応用力学研究所, 助手 (60038544)
HIYAMA Hiromi  Research Institute for Applied Mechanics, Kyushu University., 応用力学研究所, 助手 (30038541)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1986: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1985: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsComposite Materials / Crack / Delamination / Debonding / Stress Intensity Factor / Toughness / Fracture / Short Fiber
Research Abstract

1. The damage model with shear resistance along the fiber-matrix boundary was applied to the microscopic failure processes in composite materials using the shear lag analysis. The focused materials were the broken fiber reinforced composites, hybrid composites, and short fiber composites. The effects of the geometrical and material constants were obtained. One of the interesting results is as follows. If the Griffith type of energy equation is the dominant condition for the propagation of debonding, it propagates gradually at first and beyond some critical value of debonding length it propagates catastrophically to the final failure of short fiber composites. This critical value is dependent on both the fiber aspect ratio and the Young's modulus ratio.
2. Three-dimensional elastic analysis was applied to the interaction between the fiber and crack in composite materials. The integral equation was formulated to yield the effect of fiber on the stress intensity factor of a penny shaped cr … More ack in composite materials under Mode <III> loading. The nearest fibers have the dominant effect on the stress intensity factor than any other fiber.
3. An approximate analytical solution was obtained for the microscopic stress distribution in unidirectional composites. It has strong relation to the debonding and shear resistance between the fiber and matrix. The increased fiber volume fraction was found to change the normal stress at the boundary from the compressive to tensile one in the real composite system under axial tensile loading.
4. An numerical process to treat the integral equation for the T-shaped crack was found to yield the resonable stress intensity factor of the boundary crack between different materials.
5. The experimantal models for the above 2 and 4 were made to insure the analytical solutions. A Charpy type impact test was performed to obtain the fracture mode and energy in case of 2. The caustic method was used to obtain the stress intensity factor at the debonding tip in case of 4. Less

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Y.Takao: Proceedings of the Fifth International Conference on Composite Materials(The Metallurgical Society of AIME). ICCM-V. 67-84 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Y.Takao: Composites'86 Recent Advances in Japan and the United States(Japan Society for Composite materials).249-256 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Y.Takao: Proceedings of the Sixth International Conference on Composite Materials(Elsevier Applied Science Publishers LTD).(1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 汪文学,高雄善裕,栖原寿郎: 材料. 36. 202-208 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] W.X.Wang Y.Takao T.Suhara: International Journal of Engineering Science. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 汪文学,高雄善裕,栖原寿郎: 応用力学研究所所報. No.65. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Y. Takao: "Development of Microscopic Damage Around Short(Broken) Fiber Ends in Composite Materials." Proceedings of the Fifth International Conference on Composite Materials ( The Metallurgical Society of AIME ).ICCM- <V> . 67-84. (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Y. Takao: "Microscopic Damage Propagation at the Broken Fiber Ends in Hybrid Composite Materials with Debonding Resistance Between Fiber and Matrix." Composites'86: Recent Advances in Japan and the United States ( Japan Society for Composite Materials ).249-256. (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Y. Takao: "The Effects of Shear Resistance at Fiber Ends on the Damage Propagation." Proceedings of the Sixth International Conference on Composite Materials ( Elsevier Applied Science Publishers LTD ).ICCM- <VI> . (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] W.X.Wang, Y. Takao, & T. Suhara.: "An Approximate solution of Stress Field in Unidirectional Composites under Tensile and Thermal Loading.( in japanese )" Journal of the Society of Materials Science, Japan.36. 202-208 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] W.X.Wang, Y. Takao, & T. Suhara.: "A Fiber-Reinforced Matrix Containing a Penny-Shaped Crack Under Mode <III> Loading Condition." International Journal of Engineering Science.(1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] W.X.Wang, Y. Takao, & T. Suhara.: "An Analytical Solution of a T-Shaped Crack at the Bonded Interface in Unidirectional Composites and the Comparison with Those Using the Finite Element Technique.( in japanese )" Bulletin of Research Institute for Applied Mechanics.No.65. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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