Damage detection in grinding of steel workpieces through ultrasonic waves F Alexandre, P R Aguiar, R Götz, B O Fernandez, W N Lopes, M A A Viera, E C Bianchi and D D’addona MATEC Web Conf., 249 (2018) 02002 Published online: 10 December 2018 DOI: 10.1051/matecconf/201824902002