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Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Aug;72(2 Pt 2):027101. Epub 2005 Aug 8.

Optimum information in crackling noise.

Author information

1
Centre for Advanced Materials Technology (CAMT), School of Aerospace, Mechanical and Mechatronic Engineering J07, The University of Sydney, Sydney, NSW 2006, Australia. chunsheng.lu@aeromech.usyd.edu.au

Abstract

The crackling noise due to scratching superhard nanocomposite coatings was investigated by using a simple stick-slip model. The optimum information extracted from statistical analysis, in terms of the Akaike information criterion, is in good agreement with real tests. As a nanocomposite coating approaches an optimal performance, the acoustic emission energy follows a power-law distribution and its behavior is likely to be independent of microscopic and macroscopic details. The results imply that a peculiar deformation behavior, due to the competition between different deformation mechanisms such as dislocation pile-ups in nanocrystalline grains and grain sliding-grain rotation within amorphous boundaries, plays a vital role in the nanostructure with superhardness.

PMID:
16196751
DOI:
10.1103/PhysRevE.72.027101

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