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東北・北海道支部 特別講演会のご案内

下記により特別講演会を開催いたしますので、奮ってご参加ください。

 

< 記 >

 1.日 時 

2004年6月17日(木)14:00―15:00

 2.講 演 題 目 

Mechanical Properties of Carbon-Nanotube Ceramic Matrix Composites

 3.講 演 者 

Professor William Curtin

Brown University, Division of Engineering

 4.場 所 

東北大学大学院工学研究科 機械・知能系共同棟6階会議室(611室)

〒980-8579 仙台市青葉区荒巻字青葉01

仙台市内から東北大学までの経路図

東北大学大学院工学研究科の配置図

 5.参 加 費 

無料

 6.要 旨 

The excellent mechanical properties of carbon-nanotubes are driving research into the creation of new strong, tough nanocomposite systems. Here, the evidence of toughening mechanisms operating in carbon-nanotube-reinforced ceramic composites is presented. A highly-ordered array of parallel multiwall carbon-nanotubes (CNTs) in an alumina matrix was fabricated. Nanoindentation introduced controlled cracks and the damage was examined by SEM. These nanocomposites exhibit the three hallmarks of toughening in micron-scale fiber composites: crack deflection at the CNT/matrix interface; crack bridging by CNTs; and CNT pullout on the fracture surfaces. Interface debonding and sliding can thus occur in materials with microstructures approaching the atomic scale. Furthermore, for certain geometries a new mechanism of nanotube collapse in "shear bands" occurs, rather than crack formation, suggesting that these materials can have multiaxial damage tolerance. Evidence for a novel nanotube fracture mode is also presented.

 7.問い合せ先

〒980-8579 仙台市青葉区荒巻字青葉01

東北大学大学院工学研究科航空宇宙工学専攻

岡部 朋永


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