Critical depth of cut and specific cutting energy of a microscribing process for hard and brittle materials

Junz Jiunn-jyh Wang, Yong Yuan Liao

Research output: Contribution to journalArticle

23 Citations (Scopus)


This paper investigated the scribing process characteristics of the hard and brittle materials including single crystal silicon, STV glass, and sapphire substrate. Under various cutting angles, major process characteristics are examined including the groove geometry, specific cutting energy, and critical depth of cut at the onset of ductile-to-brittle cutting transition. As the cutting depth increases, groove geometry clearly reveals the ductile-to-brittle transition from the plastic deformation to a brittle fracture state. The material size effect in the ductile region as well as the transition in scribing behavior is well reflected by change in the specific cutting energy. Further, it is shown that the change of specific cutting energy as a function of the cutting depth can serve as a criterion for estimating the critical depth of cut. Such estimated critical depth of cut is confirmed by measurement from a 3D confocal microscope. The critical depths of cut for these hard materials are found to be between 0.1 μm and 0.5 μm depending on the materials and cutting angles.

Original languageEnglish
Pages (from-to)110021-110026
Number of pages6
JournalJournal of Engineering Materials and Technology, Transactions of the ASME
Issue number1
Publication statusPublished - 2008 Jan 1

All Science Journal Classification (ASJC) codes

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

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