| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
|
| Presentation Title |
A Novel Fracture Observation in SiC-based Ceramics Through In-situ Double Torsion Testing |
| Author(s) |
Pania Newell, Robert Wheeler, Matthew Dickerson |
| On-Site Speaker (Planned) |
Pania Newell |
| Abstract Scope |
In classical fracture mechanics, crack propagates rapidly, once it reaches the critical stress intensity factor. However, crack can propagate below this threshold called “subcritical crack growth” (SCG). This phenomenon is one of the main causes of time-dependent behavior of the crack. The double torsion (DT) test is a powerful fracture technique that can provide a constant stress intensity as crack length increases. DT test configuration consists of a symmetric four-point loading around a pre-existing crack on one end of a rectangular plate, which produces torsional deformation in the two plate halves. In this study, we investigate SCG in Scanning Electron Microscopy (SEM) using DT technique for a porous SiC-based ceramics. The degree of control of crack growth, with increments in crack length of less than micron allows to find the relationship between stress intensity factor and crack velocity and further characterize it as a function of the underlying pore network. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |