Fracture Behavior of Nanoscale Notched Silicon Beams Investigated by the Theory of Critical Distances

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • Kyoto University

Abstract

This paper investigates the nanoscale fracture behavior of silicon using the Theory of Critical Distances (TCD) and demonstrates that TCD can correctly estimate the magnitude of the breakdown of continuum fracture mechanics. Moreover, it proposes the TCD as an alternative strategy for the determination of fracture toughness, KIC, at the nanoscale. More specifically, in situ micromechanical testing of notched nano‐cantilever beams has been carried out in a transmission electron microscope. The material characteristic length and fracture toughness are then evaluated. The average KIC value obtained is 0.98 MPa m0.5, which is in agreement with that reported in the literature for macro‐Si. The characteristic length L is in the range of 1.3–1.9 nm. It is found that within an atomistic interpretation of the fracture of silicon, these values are in agreement with the breakdown of continuum fracture mechanics.

Details

Original languageEnglish
Pages (from-to)1700006
JournalAdvanced theory and simulations
Volume1
Issue number1
Publication statusPublished - Jan 2018
MoE publication typeA1 Journal article-refereed

    Research areas

  • Fracture toughness, theory of critical distances, single crystal silicon, nanoscale, Notch

ID: 32946940