About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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30 Years of Nanoindentation with the Oliver-Pharr Method and Beyond
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Presentation Title |
A Comparative Study of Fracture Toughness Measurements in Two Silicate Glasses Using Nanoindentation |
Author(s) |
Yvonne C. Dieudonne, George M. Pharr |
On-Site Speaker (Planned) |
Yvonne C. Dieudonne |
Abstract Scope |
The cracking behavior of silicate glasses has 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°) as well as Vickers indenters. Two different glass structures have been analyzed and compared - an anomalous glass (fused quartz) and a normal glass (soda lime silicate), which deform primarily by densification and shearing processes, respectively. These different deformation processes lead to different stress fields around the hardness impressions resulting in different cracking morphologies. Nanoindentation at various loads (e.g., 3 mN -20 N) and subsequent FIB-cross-sectioning was used to examine the morphology of the cracks and whether they are median-radial type, which are initiated underneath the indentation impression, or Palmqvist cracks, which start near the surface. Results show that the difference in cracking behavior may have important implications for determining fracture toughness by indentation cracking methods. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Other, |