|About this Abstract
||MS&T21: Materials Science & Technology
||Probing Defect Properties and Behavior under Mechanical Deformation and Extreme Conditions
||Impact of Carbon Nanotube Defects on Fracture Mechanisms in Ceramic Nanocomposites
||Yingchao Yang, Brian W. Sheldon, Izabela Szlufarska, Jun Lou
|On-Site Speaker (Planned)
It is widely believed that defects in the CNTs will alter key properties that ultimately dictate composite toughening. With ceramic nanocomposites with a polymer derived ceramic (PDC) matrix, reinforced with multiwalled CNTs, we will present fracture measurements on full composite films, combined with careful testing of individual CNTs embedded in the same PDC matrix. The defect levels in these CNTs were controlled with high energy carbon ions. By using this approach, it was possible to directly correlate defect levels with the interfacial shear strength (IFSS) of the CNT/PDC interface, the CNT fracture strengths, and the pull-out lengths observed after fracture of the full composites. The radiation induced defects led to substantial increases in the IFSS, and only a marginal decrease is observed in the measured fracture strength. Based on this, the shorter pull-out lengths that occurred with higher defect levels were primarily attributed to stronger bonding at the CNT/PDC interface.