2001 Fiscal Year Final Research Report Summary
Development of Static and Fatigue Strength Characterization System for Composite Interface using In-situ Observation
| Project/Area Number |
11555032
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
HOJO Masaki Kyoto University, Dept. Mechanical Eng., Professor, 工学研究科, 教授 (70252492)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Mototsugu Guest Lecturer for Advanced Research, 工学研究科, 講師(研究機関研究員)
MATSUBARA Teruji Shimadzu Co., Research & Development Dept., Group Head, 主任
OCHIAI Shojiro Kyoto University, Mesoscopic Materials Res. Ctr., Professor, 工学研究科, 教授 (30111925)
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| Project Period (FY) |
1999 – 2001
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| Keywords | Composite materials / Inter facial strength / Model composites / Mesoscopic structure / In-situ observation / Static strength / Fatigue strength / Numerical analysis |
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| Research Abstract |
Macroscopic fracture properties of fiber reinforced composite materials depend on the properties of mesoscopic components such as fiber, matrix, fiber/matrix interface and their spacial distribution. Then, the direct measurements of the fracture behavior of these mesoscopic components are important for the understanding of the fracture process in mesoscopic scale. In the present study, two types of model composites were used to evaluate the inter facial strength of glass fiber/epoxy composites. One is microcomposite, in which one central fiber was pulled out from six surrounding fibers was The other is couple fiber shear specimen, in which a pair of fibers was pulled away. The latter was specially designed for in-situ observation. Tests were carried out under static and fatigue loadings using low-load capacity fatigue testing machine attached to scanning electron microscope. Two and three dimensional finite element analyses were carried out to find out the mechanism and criterion of th
… More
e inter facial fracture.
The results are summarized as follows :
(1) In microcomposite tests, the fracture surface indicated the transition point of stable opening mode crack propagation to unstable shear mode crack propagation. This can be correlated to the maximum pullout load in the experiments. This condition can be expressed by the constant intensity of stress singularity without respect to the fiber diameter and the resin impregnated length.
(2) In couple fiber shear tests, in-situ observation showed stable crack growth before final unstable fracture. The three-dimensional finite element analysis indicated that the controlling mode of the fracture was mode I without respect to the crack length. The transition of stable to unstable crack growth was correlated to the minimum values of the mode I stress intensity factor with the crack length. .
(3) Couple fiber tests were carried out with fibers of different fiber diameters. The comparison of the results indicated that the above criterion was valid without respect to the fiber diameter.
(4) The tests were also carried out under fatigue loading with automated controlling and data acquisition systems. Less
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[Publications] Hojo, M., Terashima, K., Igarashi, Y., Sfiida, M., ucnui, ic, T. and Suzuki, Y.: "Interfacial Fracture in Model Composites under Static and Fatigue Loadings -Mecnanism Consideration by Experimental and Analytical Approaches-"Materials Science Research International. STP-2. 189-196 (2001)
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「研究成果報告書概要(欧文)」より
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[Publications] Hojo, M., Tanaka, M., Hobbiebrunken, T., Ochiai, s., inoue, T. and Sawada, Y.: "Inter facial Fracture of GF and CF/epoxy Model Composites under Static and Fatigue Loadings"Proc. 8th International Fatigu e Congress, Fatigue 2002, St ockholm. (2002)
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[Publications] Hojo, M., Matsuda, S., Ochiai, S., Tsujioka, N., Nakanishi,Y, Maekawa, Z.and Murakami, A.: "Mode II Interlaminar Static and Fatigue Loadings for CF/Epoxy Laminates with Different Fiber Surface Treatment"Advanced Composite Material. Vol.10, Nos. 2-3. 237-246 (2001)
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[Publications] Hojo, M., Matsuda, S., Fiedler, B., Kawada, T., Moriya, K., Ochiai, S. and Aoyama, H.: "Mode I and II Delamination Fatigue Crack Growth Behavior of Alumina Fiber/Epoxy Laminates in Liquid Nitrogen"Int. J. of Fatigue. Vol.24, Nos,2-4. 109-118 (2002)
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[Publications] Hojo, M., Yamao, Tanaka, M., Ochiai, S., iwasnita, N. and Sawada, Y.: "Effect of Interface Control on Mode I Fiterlaminar Fracture Toughness of Woven C/C Composite Laminates"JSME International Journal, S er. A.. Vol.44. No.4. 573-581 (2001)
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[Publications] Makino, K., Igarasni, Y., inoue, I., hojo, M., lanaka, M. and Ochiai, S.: "Numerical Analysis of Effect of Matrix Modulus on ifiterfacial Crack Propagation and Its Application to Experimental Evaluation in Push-out Test"Journal of the Adhesion Society of Japan. Vol.37, No.7. 266-272 (2001)
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