Mixed-mode I/II fracture of amorphous diamond-like carbon films

Krishna Jonnalagadda, Ioannis Chasiotis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Mixed-mode I/II stress intensity factors were obtained from experiments conducted on tetrahedral amorphous diamond-like carbon (ta-C) MEMS-scale specimens. The thin film ta-C specimens contained sharp edge precracks that were generated using microindentation. The crack angle varied in the range of 7°-32° resulting in varying mode mixity (K II/K I) at the crack tip. The microscale freestanding fracture specimens were loaded in uniaxial tension and the load at failure was measured and used to calculate the mixed-mode I/II stress intensity factors, K I and K II, by a finite element solution. For the limited range of pre-crack angles employed here, the resulting stress intensity factor values were comparable to those obtained for brittle materials tested at the macro scale using similar specimen geometries.

Original languageEnglish (US)
Title of host publicationProceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
Pages1353-1357
Number of pages5
StatePublished - Oct 31 2006
EventSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006 - Saint Louis, MO, United States
Duration: Jun 4 2006Jun 7 2006

Publication series

NameProceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
Volume3

Other

OtherSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
CountryUnited States
CitySaint Louis, MO
Period6/4/066/7/06

Keywords

  • MEMS
  • Stress intensity factors
  • Thin films

ASJC Scopus subject areas

  • Engineering(all)

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