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Toughening and repairability of high-strength CFRP by interlayer resin structure control

Research Project

Project/Area Number 10650085
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

HOJO Masaki  Kyoto University, Mesoscopic Materials Res.Ctr., Associate Professor, 工学研究科, 助教授 (70252492)

Co-Investigator(Kenkyū-buntansha) MATSUDA Satoshi  Himeji Institute of Technology, Dept.of Engineering, Research Associate, 工学部, 助手 (40316047)
INOUE Tadanobu  National Research Institute for Metals, Researcher, 金属材料技術研究所, 研究員
OCHIAI Shojiro  Kyoto University, Mesoscopic Materials Res.Ctr., Professor, 工学研究科, 教授 (30111925)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1998: ¥2,300,000 (Direct Cost: ¥2,300,000)
KeywordsComposite Materials / Delamination / Fracture toughness / Fatigue crack growth / Mesoscopic structure / Mode I / Mode II / Interphase / 樹脂
Research Abstract

Interlaminar fracture toughness under mode I and II loadings was investigated for unidirectional CF/epoxy laminates with ionomer interleaf. Crack path of interlaminar fracture is often arrested within the interlayer resin rich region. In the present study, the toughened interlayer resin was expanded to the interlayer/base lamina interphase. Since the crack path was located inside the toughened region, excellent interlaminar properties are expected by this new toughening concept. Using the high bonding properties of ionomer, the repairability of delaminated composites was also tried. The results are summarized as follows :
(1) Control of interlayer resin structure
Unidirectional CF/epoxy laminates was molded with ionomer interleaf of the thickess of 12 to 200 mm. EPMA analysis revealed that interphases were formed between the ionomer layer and the base CF/epoxy laminas. These interphases contain a mixture of ionomer, epoxy and carbon fibers.
(2)Interlaminar fracture toughness
The fracture t … More oughness of ionomer interleaved CF/epoxy laminates was much higher than that of base CF/epoxy laminates both under mode I and II loadings. For mode I loading, the high level of the toughness was kept constant with the crack growth.
(3)Ionomer thickness effect
Mode I interlaminar toughness initially increased with the increase of ionomer interleaf, and then leveled off. For mode II loading, the toughness continuously increased with the ionomer thickness, and reached 9 to 10 kJ/m^2, which is one of the highest among already reported results.
(4)Mode I delamination fatigue
High crack growth resistance was kept without respect to the increment of the crack length because the crack path was at the interface of the ionomer/interphase or inside the interphase region, arrested by fibers.
(5)Repairability
The delaminated specimen was hot-pressed again, and the interlaminar toughness change was investigated. Although hot-pressing without additional inomer film gave poor results, the repair with ionomer film brought the toughness comparable to the virgin laminates. Less

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (33 results)

All Other

All Publications (33 results)

  • [Publications] Satoshi Matsuda: "Effect of Ionomer Thickness on Mode I Interlaminar Fracture Toughness for Ionomer Toughened CFRP"Composites : Part A. 30. 1311-1319 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masaki Hojo: "The Role of Interleaf/Base Lamina Interphase in Toughening Mechanism of Interleaf-Toughened CFRP"Proceedings of Twelfth International Conference on Composite Materials. (CD-ROM). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 北條正樹: "アルミナ繊維/エポキシ一方向積層板の室温大気中におけるモードI・II層間破壊じん性および疲労き裂伝ぱ"材料. 48. 1400-1407 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 北條正樹: "液体窒素中におけるアルミナ繊維/エポキシ積層板のモードII静的・疲労層間破壊"日本機械学会論文集,A編. 65. 2405-2410 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 松田聡: "アイオノマーインターリーフ高じん化CFRPのモードI層間破壊じん性"材料. 47. 1125-1130 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 松田聡: "アイオノマーインターリーフ炭素繊維/エポキシ積層板のモードII層間破壊じん性"日本接着学会誌. 36. 45-52 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 落合庄治郎: "材料特性と材料選択,岩波講座,現代工学の基礎,材料系III"岩波書店. 162 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Matsuda, S., Hojo, M., Ochiai, S., Murakami, A., Akimoto, H.and Ando, M.: "Effect of Ionomer Thickness on Mode I Interlaminar Fracture Toughness for Ionomer Toughened CFRP"Composites : Part A. Vol.30, No.11. 1311-1319 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Hojo, M., Matsuda, S., Ochiai, S., Murakami, A.and Akimoto, H.: "The Role of Interleaf/Base Lamina Interphase in Toughening Mechanism of Interleaf-Toughened CFRP"Proceedings of Twelfth International Conference on Composite Materials. ICCM-12/CD-ROM. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Hojo, M., Matsuda, S., Ochiai, S., Moriya, K.and Aoyama, H.: "Interlaminar Fracture Toughness and Delamination Fatigue under Mode I and II Loadings of Unidirectional Alumina Fiber/Epoxy Laminates"Journal of the Society of Materials Science. Vol.48, No.12. 1400-1407 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Hojo, M., Matsuda, S., Ochiai, S., Moriya, K.and Aoyama, H.: "Mode II Interlaminar Fracture Toughness under Static and Fatigue Loadings of Alumina Fiber/Epoxy Laminates in Liquid Nitrogen"Transactions of the Japan Society of Mechanical Engineers, Ser.A. Vol.65. 2405-2410 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Matsuda, S., Hojo, M., Ochiai, S., Moriya, K., Murakami, A., Usui, Y..and Ando, M.: "Mode I Interlaminar Fracture Toughness of Ionomer Interleaved CFRP Laminates"Journal of the Sciety of Materials Science, Japan. Vol.47, No.11. 1125-1130 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Matsuda, S., Hojo, M., Murakami, A., Ochiai, S., Moriya, K., Akimoto, H.and Ando, M.: "Mode II Interlaminar Fracture Toughness of Ionomer Interleaved Carbon Fiber/Epoxy Laminates"Journal of the Adhesion Society of Japan. Vol.36, No.2. 45-52 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ochiai, S., Hojo, M., Fujita, S.and Itoh, Y.: "Materials Properties and Material Selection"Iwanami Lecture Series, Fundamental of Current Engineering, Materials Science. Vol.III. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masaki Hojo: "Effects of Interface Control and Heat-Treatment Temperature on Interlaminar Shear Strength and Mode II Interlaminar Fracture Toughness of Woven C/C Composites"Materials Science Research International. 7. 34-40 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 松田聡: "アイオノマーインターリーフ炭素繊維/エポキシ積層板のモードII層間破壊じん性"日本接着学会誌. 36. 45-52 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Janis Andersons: "Model of Delamination Propagation in Brittle-Matrix Composites under Cyclic Loading"J.Reinforced Plastics and Composites. 20. 1-20 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Masaki Hojo: "Mode II Static and Fatigue Delamination of Interlayer-Toughened CFRP in Air and in Water"Proc.of the Second Asian-Australasian Conference on Composite Materials. 987-992 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Masaki Hojo: "Mode II Interlaminar Propertie under Static and Fatigue Loadings for CF/Epoxy Laminates with Different Fiber Surface Treatment"Proc.Ninth United States-Japan Conference on Composite Materials. 291-298 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Masaki Hojo: "Effect of Interface Control on Fracture Behavior of Woven C/C Composites"Int.J.of Materials and Product Technology . 16. 156-164 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 落合庄治郎: "材料特性と材料選択,岩波講座,現代工学の基礎,材料系III"岩波書店. 162 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 北條正樹: "アルミナ繊維/エピキシー方向積層板の室温大気中におけるモードI・II層間破壊じん性および疲労き裂伝ぱ"材料. 48. 1400-1407 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 北條正樹: "液体窒素中におけるアルミナ繊維/エポキン積層板のモードII静的・疲労層間破壊"日本機械学会論文集,A編. 65. 2405-2410 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Masaki Hojo: "The Role of Interleaf/Base Lamina Interphase in Toughening Mechanism of Interleaf-Toughened CERP"Proc.12th International Conference on Composite Materials. (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Masaki Hojo: "Interlaminar Fracture Toughness and Delemination Fatigue of Alumina Giber/Epoxy Laminates in Air and in Liquid Nitrogen"Proceedings of 7th Euro-Japanese Symposium. 1-6 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Satoshi Matsuda: "Effect of Ionomer Thickness on Mode I Interlaminar Fracture Toughness for Ionomer Toughened CFRP"Composites : Part A. 30. 1311-1319 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 松田聡: "液体窒素中におけるアルミナ繊維/エピキン積層板のモードI静的・疲労層間破壊"日本機械学会論文集,A層. 65. 2411-2417 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Masaki Hojo: "Rate Dependence of Fracture Behavior in CF/Epoxy Laminates and Its Influence on Static Toughness Test Standardization" Proceedings of Fourth European Conference on Composites:Testing & Standardization. 148-157 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Takayuki Kusaka: "Rate Dependence of Mode I Fracture Behavior in Carbon-Fibre/Epoxy Composite Laminates" Composite Science and Technology. 58. 591-602 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Masaki Hojo: "The Role of Interleaf/Base Lamina Interphase in Toughening Mechanism of Interleaf Toughened CFRP" Proc.12th International Conference on Composite Materials. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 日下貴之: "炭素繊維/エポキシ樹脂およびエポキシ樹脂の破壊じん性の負荷速度依存性とその相関" 日本機械学会論文集,A編. 64. 1625-1631 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 松田聡: "アイオノマーインターリーフ高じん化CFRPのモードI層間破壊じん性" 材料. 47. 1125-1130 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 松田聡: "層間高じん化CFRPのモードII層間はく離疲労に及ぼす水環境の影響" 日本機械学会論文集,A編. 64. 1639-1645 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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