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Flaw detection with guided waves using phased array technique

Jens Prager ; Carsten Hoever (Institutionen för bygg- och miljöteknik, Teknisk akustik, Vibroakustik) ; Gerhard Brekow ; Marc Kreutzbruck
Proceedings 5th International Workshop NDT in Progress, October 12 – 14, 2009, Prague, Czech Republik (2009)
[Konferensbidrag, övrigt]

Guided waves travel in plates and hollow cylinders over large distances and propagate with multiple mode shapes. Therefore the waves can be used viably for integrity tests of large scale structures. The number of propagating modes increases with frequency. Due to their dispersive character the different modes are manageable only in a limited fre-quency range. Depending on the wave length and on the angle of impingement of the wave front to the coupling surface between transducer and structure, a trace wavelength is predefined and a selective excitation of single modes becomes feasible. By using phased array tech-nique the excited wave mode can be selected by controlling the input signal of the transducer. Different modes are excitable with a single mechanical set-up. In a first step of the investigation, a calculation model is developed modelling the wave propagation and the selective excitation of guided wave modes depending on the control parameters. Dedicated experiments show the applicability of the method presented. The flaw detection of different sized cracks and of material thickness reductions is examined depending on the excitation wave mode.

Nyckelord: non-destructive testing, flaw detection, guided waves, lamb waves, phased array, plates



Denna post skapades 2010-04-06. Senast ändrad 2014-09-17.
CPL Pubid: 119223

 

Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Teknisk akustik, Vibroakustik

Ämnesområden

Akustik

Chalmers infrastruktur