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Dynamic Visualization of Crack Tip Stress Field and Propagation Using the Mechano-Luminescence in SrAl2O4: (Eu,Dy,Nd)

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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, SrAl2O4: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.

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Periodical:

Materials Science Forum (Volumes 475-479)

Pages:

1121-1124

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.475-479.1121

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Cite this paper

Online since:

January 2005

Authors:

Ji Sik Kim, Yong Nam Kwon, Kee Sun Sohn

Keywords:

Dynamic Crack Propagation, Mechano-Luminescence, Structural Ceramic Material

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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