Dynamic visualization of crack tip stress field and propagation using the mechano-luminescence in SrAl2O4:(Eu,Dy,Nd)

Ji Sik Kim, Young Nam Kwon, Kee Sun Sohn

Research output: Contribution to journalConference articlepeer-review

6 Scopus citations

Abstract

The present investigation aimed at visualizing the propagating crack in a mechano-luminescence (ML) material, which enabled us to measure instantaneous R-curves and observe directly the bridging (shielding) stress in the fast-propagating crack system. The well-known ML compound, SrAl 2O4:Eu,Dy,Nd, was adopted as a testing material. The crack initiation and growth from the mechanically machined sharp notch tip in the disc shaped compact tension (CT) specimen at a relatively fast loading rate were found to be associated with the extent of light emission around the crack. The in-situ measurement of crack length and applied load for 0.3 sec yielded an instantaneous R-curve at the conventional crack propagation speed.

Original languageEnglish
Pages (from-to)1121-1124
Number of pages4
JournalMaterials Science Forum
Volume475-479
Issue numberII
DOIs
StatePublished - 2005
EventPRICM 5: The Fifth Pacific Rim International Conference on Advanced Materials and Processing - Beijing, China
Duration: 2 Nov 20045 Nov 2004

Keywords

  • Dynamic Crack Propagation
  • Mechano-luminescence
  • Structural Ceramic material

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