Evaluation of Crack Bridging Characteristics in Carbon Nanotube/Alumina Composites Using Single Fiber Pullout Testing Method

• YAMAMOTO Go

  Institute of Fluid Science, Tohoku University

• SHIRASU Keiichi

  東北大学大学院環境科学研究科

• TAKAGI Toshiyuki

  東北大学流体科学研究所

• HASHIDA Toshiyuki

  東北大学工学研究科附属エネルギー安全科学国際研究センター

Bibliographic Information

Other Title

• 単繊維引抜き試験によるカーボンナノチューブ/アルミナ複合材料のクラックブリッジング挙動特性評価

Abstract

The crack bridging behavior of multi-walled carbon nanotube-reinforced alumina matrix composites has been investigated using a single fiber pullout testing method. Contradictory to the conventional understanding (which have reported that pullout phenomena evidently occurred in the bulk nanotube-reinforced alumina composites), the pullout experiments using an in situ SEM method with a nanomanipulator system demonstrated that strong load transfer was revealed, and no pullout behavior was observed for all 15 MWCNTs. The MWCNTs, rather than pulling out from the alumina matrix, broke in the outer-shells and the inner section was pulled away, leaving the outer-shells of the fragment in the matrix. This implies that tougher ceramics with MWCNT can be obtained by creating the appropriate interaction between the matrix and MWCNT: not too week but also not too strong to permit an adequate load transfer between the two parts and thus a consequent pulling out without breakage of MWCNT. Our finding suggests important implications for the design of tougher ceramic composites with MWCNTs. The important factor for such tougher ceramic composites will thus be the use of 'strong' MWCNTs having higher mechanical performance (as well as a good dispersion in the matrix).

Journal

• TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A

  TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 77 (777), 779-783, 2011

  The Japan Society of Mechanical Engineers

Keywords

• Carbon Nanotubes
• Ceramics
• Composite Material
• Crack Bridging Behavior
• Single Fiber Pullout Tests

Details

• CRID: 1390282679454694528
• NII Article ID: 130000874068
• DOI: 10.1299/kikaia.77.779
• ISSN: 18848338
• ISSN: 03875008
• Web Site: http://www.jstage.jst.go.jp/article/kikaia/77/777/77_777_779/_pdf
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed