New insights into the indentation size effect in silicate glasses

Maryam Kazembeyki, Mathieu Bauchy, Christian Hoover

Research output: Contribution to journalArticle

Abstract

When glasses resist permanent deformations, for applications such as a windshield or the cover of a touch-screen device, it is important to understand how they respond to inelastic energy dissipation processes. Many glasses exhibit the so-called Indentation Size Effect (ISE), where the indentation hardness is dependent on the maximum force exerted on the probe. In this study, we perform microindentation on silica and soda lime silicate glasses over a wide range of maximum forces and extract the Vickers hardness by the Oliver and Pharr method. The inelastic volume responsible for dissipating the inelastic energy is decomposed into densification and plastic flow, using surface topography and annealing. We show that the ISE is intimately linked to these mechanisms. Finally, we hypothesize the cause of the ISE is an increase in plasticity in a zone of material under the indenter probe experiencing reduced viscosity due to high strain rates and shear thinning.

Original languageEnglish (US)
Article number119494
JournalJournal of Non-Crystalline Solids
Volume521
DOIs
StatePublished - Oct 1 2019

Fingerprint

Silicates
indentation
Indentation
silicates
Glass
glass
windshields
Windshields
Touch screens
shear thinning
Vickers hardness
Shear thinning
probes
plastic flow
calcium oxides
Surface topography
densification
Plastic flow
Densification
plastic properties

Keywords

  • AFM
  • Ductility
  • Energy dissipation
  • Hardness
  • Modulus

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

New insights into the indentation size effect in silicate glasses. / Kazembeyki, Maryam; Bauchy, Mathieu; Hoover, Christian.

In: Journal of Non-Crystalline Solids, Vol. 521, 119494, 01.10.2019.

Research output: Contribution to journalArticle

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