Shearographic imaging of the ultrasonic wave and defect interaction in plates: Comparison between computation and experiment

Osmont, D.; Taillade, F.; Devillers, D.; Krapez, J.-C.; Lepoutre, F.; Balageas, D.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p853
Academic Journal
A possible method to characterize damages in composite plates is the use of interaction of Lamb waves with defects. Nevertheless, the understanding of this interaction is not trivial and the reconstruction of the exact shape of the damage needs to develop models able to interpret the experiments. A two-dimensional image showing the diffraction figure is probably the richest experimental information. This paper presents a model to interpret global images of this interaction produced by shearography. The results presented are limited to the case of the modes A[sub o] and S[sub o] in an aluminum plate, case which is much smaller than what occurs in a composite but clearly explains the possibilities of the method. Experimentally, a piezo-transducer bonded on one face of the plate is used to generate the modes A[sub o] and S[sub o] while a specific optical configuration allows the separation of the normal and the two in-plane components of the displacement. A finite element model of the plate leads to the evaluation of its response by an explicit central difference scheme. To compare the experimental and numerical results, a shearography experiment is simulated by substituting a numerical image of displacements in the optical shearing procedure. After updating the excitation force, a good agreement between the experimental and numerical result is reached. Applications to plates containing one or several holes will be discussed to illustrate this idea. © 2000 American Institute of Physics.


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