Determination of fracture toughness using the area of micro-crack tracks left in brittle materials by Vickers indentation test

Alireza Moradkhani*, Hamidreza Baharvandi, Mehdi Tajdari, Hamidreza Latifi, Jukka Martikainen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

50 Citations (Scopus)

Abstract

In this article, a new method has been presented for the estimation of fracture toughness in brittle materials, which enjoys improved accuracy and reduced costs associated with fracture toughness testing procedure compared to similar previous methods, because a vast range of specimens with irregular cracks can be accommodated for testing. Micron-sized alumina powders containing 0.05 wt% magnesium oxide (MgO) nanoparticles were mixed and also together with 2.5 vol%, 5 vol%, 7.5 vol%, 10 vol%, and 15 vol% of silicon carbide (SiC) nanopowders separately. By making and testing various types of ceramics with different mechanical properties, and considering the irregular cracks around the indented area caused by Vickers diamond indenter, a semi-empirical fracture toughness equation has been obtained.

Original languageEnglish
Pages (from-to)87-102
Number of pages16
JournalJournal of Advanced Ceramics
Volume2
Issue number1
DOIs
Publication statusPublished - 1 Mar 2013
MoE publication typeA1 Journal article-refereed

Keywords

  • fracture toughness
  • indentation
  • mechanical properties
  • nanocomposites

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