Experimental determination of the fracture toughness via microscratch tests: Application to polymers, ceramics, and metals

Ange Therese Akono, Nicholas X. Randall, Franz Josef Ulm*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

86 Scopus citations

Abstract

This article presents a novel microscratch technique for the determination of the fracture toughness of materials from scratch data. While acoustic emission and optical imaging devices provide quantitative evidence of fracture processes during scratch tests, the technique proposed here provides a quantitative means to assess the fracture toughness from the recorded forces and depth of penetration. We apply the proposed method to a large range of materials, from soft (polymers) to hard (metal), spanning fracture toughness values over more than two orders of magnitude. The fracture toughness values so obtained are in excellent agreement with toughness values obtained for the same materials by conventional fracture tests. The fact that the proposed microscratch technique is highly reproducible, almost nondestructive, and requires only small material volumes makes this technique a powerful tool for the assessment of fracture properties for microscale materials science and engineering applications.

Original languageEnglish (US)
Pages (from-to)485-493
Number of pages9
JournalJournal of Materials Research
Volume27
Issue number2
DOIs
StatePublished - Jan 28 2012

Keywords

  • Fracture
  • Nanoindentation
  • Toughness

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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