Evaluation of Mode II Fracture Toughness in Unidirectional GFRP Using Four-Point Shear Loading Test and Its Fracture Mechanism.
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- KAWADA Hiroyuki
- Faculty of Science and Engineering, Waseda University
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- OCHI Yutaka
- Waseda University
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- SHIMANUKI Hiroshi
- Waseda University
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- HAYASHI Ikuhiko
- Faculty of Science and Engineering, Waseda University
Bibliographic Information
- Other Title
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- 4点せん断負荷試験による一方向GFRPのモードII破壊じん性評価とその破壊機構
- 4 テン センダン フカ シケン ニ ヨル 1ホウコウ GFRP ノ モード
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Abstract
Mode II fracture toughness tests of unidirectional GFRP were conducted using a four-point shear loading test method. This test method was a modified Iosipescu test method which was identified to be the most reliable one for obtaining a shear stress-strain relation in composite materials. In this study, a leverage ratio of the loading and a pre-crack length ratio of the specimen were examined to perform the fracture toughness tests. Fracture behavior of the unidirectional GFRP under shear loading was investigated through a fractographic observation. The results obtained are summarized as follows:<br>(1) The four-point shear loading test method can be assessed at a simplified in-plane mode II fracture toughness test. To prevent premature failures without reinforcement attached to the specimen, it is necessary for the pre-crack length ratio, a/W to be larger than 0.3 under the definite leverage ratio.<br>(2) The mode II fracture toughness evaluated in terms of stress intensity factors at the maximum load points was found to be dependent on the pre-crack length ratio.<br>(3) The Hackle patterns were confirmed at a stable crack propagation region which are typical fracture traces on the matrix under the shear loading. The formation mechanism of the Hackle at different parts was investigated in detail, and then the physical meaning of the fracture toughness obtained in this experiment was discussed.
Journal
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- Journal of the Society of Materials Science, Japan
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Journal of the Society of Materials Science, Japan 40 (454), 875-881, 1991
The Society of Materials Science, Japan
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Details 詳細情報について
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- CRID
- 1390001205391727360
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- NII Article ID
- 110002298504
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- NII Book ID
- AN00096175
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- ISSN
- 18807488
- 05145163
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- NDL BIB ID
- 3726447
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed