Densification as the Only Mechanism at Stake during Indentation of Silica Glass?

Abstract:

Silica glass is known to exhibit permanent changes in density under very high pressures. These changes may reach 21%. The sharp indentation test develops pressures underneath the indenter that trigger densification. Recently, we have proposed a constitutive modeling of the pressure-induced process accounting for its salient features: densification threshold, hardening, saturation of densifica- tion and permanent increase in elastic moduli. We examine in this paper the possibility that densi- fication could be the only mechanism for creating an imprint by indentation. We consider different models with growing complexity that we implement in a finite element software. Results indicate that the combination of shear and pressure as a driving force to densification may account for the mechanical response of the indentation test as well as the presence of densified zone underneath the imprint.

• Periodical: Key Engineering Materials (Volume 606)
• Pages: 53-60
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.606.53
• Online since: March 2014
• Authors: Vincent Keryvin*, Solene Gicquel, Ludovic Charleux, Jean Pierre Guin, Mariette Nivard, Jean Christophe Sangleboeuf
• Keywords: Densification, Finite Element Analysis (FEA), Fused Quartz, Glass, Imprint, Indentation, Modeling, Plasticity

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