| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale V
|
| Presentation Title |
Investigation of Crack Nucleation and Propagation During Nanoindentation of Silicate Glasses |
| Author(s) |
Yvonne C. Dieudonne, George Pharr |
| On-Site Speaker (Planned) |
Yvonne C. Dieudonne |
| Abstract Scope |
Different aspects of cracking behavior have been studied using nanoindentation with triangular pyramidal indenters with centerline-to-face angles in the range of cube corner (35.3°) to Berkovich (65.3°). Two different glass structures have been analyzed and compared; anomalous glass (fused quartz) and normal glass (soda lime silicate), which deform primarily by densification and shearing processes, respectively. Those different deformation processes are anticipated to lead to different stress fields around the contact area resulting in different cracking morphologies. Nanoindentation at various loads (e.g., 3 mN -1000 mN) helped to identify a load dependency of the cracking behavior. Surface cracking was documented using atomic force microscopy and scanning electron microscopy. Results show that cracking is enhanced by sharper indenters and higher loads. However, there exists a distinct crack initiation threshold, below which no crack formation can be observed, which is dependent on the glass system as well as the indenter geometry. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |