Modeling of integrated Lamb waves generation systems using a coupled finite element-normal modes expansion method
As part of the research work on Smart Materials and Structures, the development of self-monitoring materials is an emerging issue. In the case of plate-shaped structures, Lamb waves can be used for their relevant properties: long-range propagation, sensitivity to internal flaws and whole-thickness interrogation. This concept requires the use of thin piezoelectric transducers integrated to the structure. Since it is of primary importance to be able to control the generated modes, a suitable modeling technique of this kind of system has been tested on different cases of practical interest. The model uses a coupled finite element-normal modes expansion approach, which allows one to consider either the case of bonded or embedded transducers. The results presented deal with examples of multi-element transducers integrated to composite materials. The influence of parameters such as the dimensions, positions and relative excitation delays of the transducers is studied.
Moulin
E
IEMN, UMR CNRS 9929, OAE Department, Universite de Valenciennes et du Hainaut Cambresis, France. emmanuel.moulin@univ-valenciennes.fr
Assaad
J
Delebarre
C
Grondel
S
Balageas
D