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CFRPのらせん積層化による曲げ挙動と破壊形態の検討
| Title: | CFRPのらせん積層化による曲げ挙動と破壊形態の検討 |
| Other Titles: | INVESTIGATION ON FLEXURAL BEHAVIORS AND FAILURE MODES OF HELICOIDALLY LAMINATED CFRP |
| Authors: | 松本, 高志1 Browse this author →KAKEN DB | | 石澤, 郁馬2 Browse this author | | 近藤, 健太3 Browse this author |
| Authors(alt): | Matsumoto, Takashi1 | | Ishizawa, Ikuma2 | | Kondo, Kenta3 |
| Keywords: | CFRP | | flexure | | fracture | | helicoidal laminate |
| Issue Date: | 2018 |
| Publisher: | 土木学会 |
| Journal Title: | 土木学会論文集A2（応用力学） |
| Journal Title(alt): | Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) |
| Volume: | 74 |
| Issue: | 2 |
| Start Page: | I_639 |
| End Page: | I_647 |
| Publisher DOI: | 10.2208/jscejam.74.I_639 |
| Abstract: | CFRPは軽量にして高剛性・高強度を有する複合材料であるが，その挙動は脆性的であり線形挙動の後に突然の局所的な破壊を生じる。本研究では生体に見られるらせん積層構造を模倣することで脆性挙動の改善を検討した。一方向炭素繊維プリプレグを積層する際に層間の配向角度差を設けることでらせん積層を構成した供試体を作製した。三点および四点曲げ載荷実験を行い，直交積層と比較して，曲げ挙動と損傷・破壊挙動を詳細に観察した。曲げ挙動においては，第一ピーク荷重を経て荷重降下した後の荷重保持が大きくなり，前後のエネルギー吸収量の比が大きくなることを確認した。特徴的な損傷・破壊挙動により，総じて局所的な損傷・破壊は起きにくくなり，損傷深さも小さくなっていることを確認した。 | | CFRP is a composite with lightweight, high stiffness, and high strength, however it behaves in a brittle manner with localized fracture. In the current study, helicoidally laminated CFRP specimens replicated after a biological body are examined in flexure for the purpose of mitigating a brittle behavior. Four kinds of CFRP specimens were fabricated by stacking unidirectional prepregs with constant fiber angle difference between adjacent laminas.Three-point and four-point flexural tests were conducted, and damage and fracture processes were observed closely. Compared to a cross-ply laminate CFRP specimen, helicoidally laminated CFRP specimens show the increased residual strength after the first peak, and their postpeak energy absorption ratio to prepeak is highly improved. Due to the unique damage processes of helicoidally laminated CFRP specimens, it is found that localized fracture is mitigated with reduced damage depth. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/80823 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 松本 高志
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