Micro-Brillouin spectroscopy mapping of the residual density field induced by Vickers indentation in a soda-lime silicate glass

TL;DR

This study employs high-resolution Brillouin spectroscopy to map residual densification in soda-lime silicate glass caused by Vickers indentation, enabling detailed analysis of stress-induced density changes.

Contribution

It introduces a method to quantitatively map residual density fields in glasses using Brillouin micro-spectroscopy, linking optical measurements to mechanical models.

Findings

Residual densification fields are nearly isotropic.

Brillouin spectroscopy effectively maps 3D density variations.

Results support the use of optical methods for stress analysis in glasses.

Abstract

High-resolution Brillouin scattering is used to achieve 3-dimensional maps of the longitudinal acoustic mode frequency shift in soda-lime silicate glasses subject to Vickers indentations. Assuming that residual stress-induced effects are simply proportional to density changes, residual densification fields are obtained. The density gradient is nearly isotropic, confirming earlier optical observations made on a similar glass. The results show that Brillouin micro-spectroscopy opens the way to a fully quantitative comparison of experimental data with predictions of mechanical models for the identification of a constitutive law.