Indentation deformation in oxide glasses: Quantification, structural changes, and relation to cracking

• DOI: 10.1016/j.nocx.2018.100007
• Publication Date: 2019-01-11T03:54:36Z
• Authors: Kacper Januchta; Morten M. Smedskjaer
• Keywords: Indentation; Deformation mechanism; Characterization

Improving the fracture resistance of oxide glasses through adjustment chemical composition remains a challenging task, although composition-mechanical property relations have been established for simple model systems. The glass mechanical properties are, among other methods, conventionally tested using instrumented indentation, which is fast and convenient technique that mimics real-life damage certain applications, interpretation can be due to complex stress fields develop under indenter. Early indentation experiments shown exhibit pronounced tendency densify compressive load compared metals ceramics. After decades investigations, it now known extent densification strongly dependent on glass' in turn its atomic packing density Poisson's ratio. Spectroscopic techniques shed light mechanism densification, include changes bond angle distributions as well an increase coordination number network-forming cations. Knowledge such details crucial understanding link between cracking glasses, since efficient way dissipate elastic energy applied material during indentation. Here, we review experimental work identification quantification deformation probing accompanying structural glassy network. We also conclusions drawn from computer simulation studies, provide atomistic mechanisms. Finally, discuss crack resistance.