J. Phys. IV France 02 (1992) C1-1079-C1-1082
DIFFUSION DES ONDES DE LAMB PAR L'EXTRÉMITÉ D'UNE PLAQUE BISEAUTÉE IMMERGÉEP. PAREIGE, E. LUPPE, M. ECH-CHERIF EL-KETIANI and J. RIPOCHE
Laboratoire d'Acoustique Ultrasonore et d'Electronique, UR4 CNRS 1373, Université du Havre, Place Robert Schuman, F-76610 Le Havre, France
We present an experimental study of the scattering of Lamb waves reaching the edge of an aluminium semi-infinite plate immersed in water. Firstly the investigated plate is with a right-angle end section, then with an end section of various angles. For different Lamb modes the amplitude of the radiated bulk wave in the water 1s recorded versus the angle of observation. In order to explain these patterns, we propose a simple mode1 which deals with the Lamb wave displacements inside the plate. The agreement between the theoretical diagrans and the experiisental ones is discussed. It 1s found quite good for the right angle end section and for small end section angles.
© EDP Sciences 1992