Effect of plate wave dispersion on the acousticemission parameters in metals教程.pdf

Computers and Structures 98-99 (2012) 17–22 Contents lists available at SciVerse ScienceDirect Computers and Structures journal homepage: www.elsevi /locate/compstruc Effect of plate wave dispersion on the acoustic emission parameters in metals D.G. Aggelis ⇑, T.E. Matikas Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece a r t i c l e i n f o a b s t r a c t Article history: Acoustic emission (AE) is an inspection technique for monitoring of metals. AE parameters depend on the Received 14 September 2011 source mechanism and proper study enlightens the material’s condition. Classification criteria based on Accepted 25 January 2012 AE parameters are established concerning the material’s status. However, the shape of the AE waves Available online 23 February 2012 depends on the propagation path. Thin plates exhibit strong dispersion that influences waveform param- eters. This paper numerically studies wave propagation through a homogeneous plate. The study does not Keywords: concern classical parameters like velocity and attenuation, but AE waveform parameters. It is shown that Dispersion any classification, should incorporate the source location in order to exclude the effect of dispersion. Wave propagation Numerical simulation 2012 Elsevier L