Journal
NDT & E INTERNATIONAL
Volume 40, Issue 1, Pages 29-34Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2006.07.010
Keywords
lamb wave; ageing; composite; air-coupled ultrasound
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Thermo-oxidative ageing of carbon-epoxy plates has been done for up to 3500 h at two temperatures. Non-destructive evaluation by means of non-contact ultrasonic methods has been tested to characterize the aged plates. Experimental results obtained using Lamb waves propagation in the plates are presented here. Experimental and theoretical dispersion curves are compared. It is shown that the phase velocity of the A(o) and S-o Lamb modes is decreasing when ageing duration increases. Assuming the plate to be homogeneous and orthotropic, we demonstrate that this phenomenon is related to an important decrease of the C-55 elastic parameter of the plate. (C) 2006 Elsevier Ltd. All rights reserved.
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