| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Ceramic Matrix Composites
|
| Presentation Title |
Interfacial Fracture Toughness on SiC/SiC CMCs |
| Author(s) |
Oriol Gavalda-Diaz, Luc Vandeperre, Eduardo Saiz, Finn Giuliani |
| On-Site Speaker (Planned) |
Oriol Gavalda-Diaz |
| Abstract Scope |
Internal interphases in SiC/SiC are designed to achieve the graceful failure required in structural applications. Consequently, understanding interfacial crack propagation and measuring interfacial properties such as the fracture toughness, friction or residual stresses is crucial to understand, predict and model the failure of these materials and their degradation in different environments. In SiC/SiC materials the fibres are normally coated with graphite-like C or hexagonal BN interphases to achieve the desired interfacial properties. In this presentation we show different micromechanical tests that can be used to propagate a stable crack at the interfacial region and measure the interfacial fracture toughness. This includes micro Double Cantilever Beam (DCB) and push out tests using an SEM in-situ setup. With these tests we measure the Mode I and Mode II interfacial fracture toughness and we can distinguish the different debonding and fracture events as they occur. |