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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Gelebart, Y. Duflo, H. Duclos, J. Morvan, B. |
| Copyright Year | 2006 |
| Description | Author affiliation: Lab. d'Acoustique Ultrasonore et d'Electronique, Univ. du Havre, Le Havre (Gelebart, Y.; Duflo, H.; Duclos, J.; Morvan, B.) |
| Abstract | Thermo-oxidative ageing of carbon-epoxy plates has been done for up to 9000 hours at two temperatures (160 and 180degC). Non-destructive evaluation by means of non contact ultrasonic methods has been tested to characterize the aged plates. It is shown that the phase velocity of the A0 and S0 Lamb modes is decreasing when ageing duration increases. Micrographs reveal the presence of oxidation cracks propagating from the free surfaces of the plate. The plates thus become inhomogeneous in the thickness. The propagation of the Lamb waves, in the aged plates, is simulated using a finite element model of an inhomogeneous and anisotropic plate. The excitation of several modes in a frequency range (chirp excitation) or a single mode at a chosen frequency (burst windowed excitation) is applied. To simulate the ageing of carbon-epoxy composite plates (8 plies), the elastic parameters are decreased in the two external plies. The results are then compared with experiments. Using this FE model, we demonstrate that this phenomenon is related to an important decrease of the $C_{55}$ elastic parameter of the plate |
| Starting Page | 1165 |
| Ending Page | 1168 |
| File Size | 403380 |
| Page Count | 4 |
| File Format | |
| ISBN | 1424402018 |
| ISSN | 10510117 |
| DOI | 10.1109/ULTSYM.2006.299 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2006-10-02 |
| Publisher Place | Canada |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Aging Temperature Frequency Fatigue Laminates Ovens Nondestructive testing Oxidation Surface cracks Finite element methods |
| Content Type | Text |
| Resource Type | Article |
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