Journal
ACTA MATERIALIA
Volume 114, Issue -, Pages 146-153Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2016.05.027
Keywords
Amorphous silica; Micropillars; Densification; Shear flow; Fracture; In situ testing; Finite element analysis
Funding
- French National Research Agency (ANR) [ANR-13-BS09-0012-01, ANR-12-BS04-0004-03]
- Rhone-Alpes Region
- Agence Nationale de la Recherche (ANR) [ANR-13-BS09-0012] Funding Source: Agence Nationale de la Recherche (ANR)
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The plastic behavior of silicate glasses has emerged as a central concept for the understanding of glass strength. Here we address the issue of shear-hardening in amorphous silica. Using in situ SEM mechanical testing with a high stiffness device, we have been able to compress silica pillars to large strains while directly monitoring radial strain. The sizeable increase of pillar cross-section during compression directly demonstrates the significant role of homogeneous shear flow. From the direct evaluation of the cross section, we have also measured true stress-strain curves. The results demonstrate that silica predominantly experiences plastic shear flow but that there is no shear-induced hardening. The consequence of this finding for our understanding of glass strength is discussed. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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