Nonlinear characterization of resonant piezocomposites 1-3 for NDT ultrasonic transducers J. A. Casals, A. Albareda, R. Pérez, J. H. Kayombo, E. Minguella and F. Montero de Espinosa Eur. Phys. J. AP, 11 1 (2000) 15-20 Published online: 15 July 2000 DOI: 10.1051/epjap:2000141