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Effects of Low Level Temperature Cycle on the Delamination Progress in Quasi-isotropic Laminates

Research Project

Project/Area Number 06452347
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

TAKAO Yoshihiro  Kyushu University, Research Institute for Applied Mechanics, Professor, 応用力学研究所, 教授 (30108766)

Co-Investigator(Kenkyū-buntansha) WANG Wen-Xue  Kyushu University, Research Institute for Applied Mechanics, Associate Professor, 応用力学研究所, 助教授 (40240569)
福田 重久  九州大学, 応用力学研究所, 助手 (60038544)
Project Period (FY) 1994 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥7,000,000 (Direct Cost: ¥7,000,000)
Fiscal Year 1996: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1995: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1994: ¥5,500,000 (Direct Cost: ¥5,500,000)
KeywordsComposite Laminates / Delamination / Thermal Effect / Non-Linear Behavior / Crack / Cyclic Thermal Loadiong
Research Abstract

Effects of temperature on the damage propagation and strength of quasi-isotropic laminates [0/45/-45/90]s were investigated. Non-linearity is found to be due to the increase of crack density both in -45 and 90 degree layrs at low temperature of -100 in centigrade and due to the delamination at high temperature of 150 in centigrade. The knee point of stress-strain relation corresponds to the coalescence of delaminations in each interface and the their propagation to the depth direction at both temperatures. Other characteristic phenomena are as follows such as (1) the direction of matrix crack propagation in -45 degree layr, (2) the multi cracks generated along the depth-direction in -45 degree layr, (3) the increase of delamination density between 45/-45 layrs, (4) the progress of the gap between side edges of each layr at high temperature and (5) fiber break cross to the edge surface in 0 degree layr at high temperature.
Thermo-mechanical constants were obtained in each temperature and the numerical results based on these data explain the above (3). The followings were also found that the longitudinal Young's modulus at 150 degree in centigrade is 10% less than that of room temperature and that the shear modulus between longitudinal and normal increases at -100 degree in centigrade much more than the other moduli.
At high temperature a new carbon fiber reinforced polyimide without toxicity was studied to obtain its delamination characteristics. A new toughness parameter is proposed for the crack with time-dependent behavior near the crack tip under high temperature.

Report

(4 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • 1994 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] W.X.Wang & Y.Takao: "An Analysis for Crack Parallel to the Interface of Bimaterial System" Journal of Thermoplastic Composite Materials. 10. 31-50 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 金炯秀、高雄善裕他3名: "Carbon/Epoxy擬似等方性積層板の各温度環境下における微視的損傷" FRPシンポジウム論文集. 26. 245-248 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 黄木景二、高雄善裕: "Carbon/Epoxy擬似等方性積層板の損傷進展に及ぼす吸湿の影響" FRPシンポジウム論文集. 26. 104-107 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 肖毅、汪文学、高雄善裕: "ピン継手による複合材料積層板接合部の2次元接触応力解析について" 九州大学応用力学研究所所報. 81. 1-13 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] W.X.Wang & Y.Takao: "An Analysis for Crack Parallel to the Interface of Bimaterial System" Journal of Thermoplastic Composite Materials. 10. 31-50 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.S.Kim, Y.Takao et al.: "Microscopic Damage of Quasi-Isotropic Carbon/Epoxy Laminates under Various Temperatures" Proceedings of FRP Symposium. 26. 245-248 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Ogi and Y.Takao: "Effect of Moisture on Damage Progress in Quasi-Isotropic Carbon Epoxy Laminates" Proceedings of FRP Symposium. 26. 104-107 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Xiao, W.X.Wang and Y.Takao: "A Two-Dimensional contact Stress Analysis of a Pinned Joint in Composite Laminates" Bulletin of the Research Institute for Applied Mechanic. 81. 1-13 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 金炯秀、高雄善裕他3名: "Carbon/Epoxy擬似等方性積層板の各温度環境下における微視的損傷" ERPシンポジウム論文集. 26. (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 黄木景二、高雄善裕: "Carbon/Epoxy擬似等方性積層板の損傷進展に及ぼす吸湿の影響" ERPシンポジウム論文集. 26. (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] W. X. Wang & Y.Takao: "An Analysis for Crack Parallel to the Interface of Bimaterial System" Journal of Thermoplastic Composite Materials. 9. 12-22 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] W.X.Wang and Y.Takao: "Local buckling of a layer bonded to a half space with an interface crack" Journal of Applied Mechanics. 62. (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] W.X.Wang and Y.Takao: "An analysis for cracks parallel to the interface of bimaterial systems" Proc.American Society for Composites. 211-220 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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