Theoretical determination of the criteria for bonding quality characterization inside a multilayer by ultrasonic echo-pulse methodIdris Aboudaoud, Faiz Bouazza, Driss Izbaim, El Houssaine Ouacha and Hicham BanouniE3S Web Conf., 297 (2021) 01048DOI: https://doi.org/10.1051/e3sconf/202129701048