Impact of strain rate on the Indentation Size Effect: Evidence of an intimate link between Size effect, Strain Rate and Ductility in Soda-lime Silica glass

Pratikshya Shrestha, Morten M. Smedskjaer, Mathieu Bauchy, Christian G. Hoover

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Many glasses exhibit the so-called indentation size effect (ISE), where the indentation hardness decreases with the maximum applied force. Here, we seek to uncover the connection between the ISE and strain rate in soda-lime silica (SLS) glass using micro-indentation. Two different loading protocols: constant loading rate (CLR), resulting in a nonlinear strain rate through the depth of indent, and a non-linear loading rate that gives a constant strain rate (CSR) with depth, are used to determine Hardness for six different strain rates and seven peak forces. A modified Bernhardt size effect law is then used to determine the extent of the ISE and load-independent hardness. We show that a small increase in micro-ductility, which can be achieved by either switching from a CLR to CSR protocol or by increasing the applied rates, can greatly reduce the extent of the ISE and slightly reduce the load-independent hardness.

Original languageEnglish (US)
Article number123031
JournalJournal of Non-Crystalline Solids
Volume637
DOIs
StatePublished - Aug 1 2024
Externally publishedYes

Keywords

  • Constant loading rate
  • Constant strain rate
  • Hardness
  • Micro-Ductility
  • Micro-indentation
  • Modulus

ASJC Scopus subject areas

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

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