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 language | English |
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Pages (from-to) | 1121-1124 |
Number of pages | 4 |
Journal | Materials Science Forum |
Volume | 475-479 |
Issue number | II |
DOIs | |
State | Published - 2005 |
Event | PRICM 5: The Fifth Pacific Rim International Conference on Advanced Materials and Processing - Beijing, China Duration: 2 Nov 2004 → 5 Nov 2004 |
Keywords
- Dynamic Crack Propagation
- Mechano-luminescence
- Structural Ceramic material