Discussion: Strength-to-fracture scaling in scratching

Ange Therese Akono, Franz Josef Ulm, Zdeněk P. Bažant

Research output: Contribution to journalComment/debatepeer-review


In their paper, Lin and Zhou (2013) add a new dimension to the scratch test analysis, challenging the applicability of Linear Elastic Fracture Mechanics to scratch tests. The question raised is how to integrate the three-dimensionality of scratch tests into the energetic Size Effect Law (SEL) formulated by Bažant for quasi-brittle materials. We show that Lin and Zhou's analysis, although relevant is incomplete, as it neglects the blade width, which is critical for the fracture property assessment. In return, if the blade width is properly taken into account, the SEL here proposed is a formidable means to ascertain the fracture toughness from scratching.

Original languageEnglish (US)
Pages (from-to)21-28
Number of pages8
JournalEngineering Fracture Mechanics
StatePublished - Mar 2014
Externally publishedYes


  • Ductile-to-brittle transition
  • Fracture mechanics
  • J-Integral
  • Scratch tests

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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