Abstract
In this work, a non-contact ultrasonic method based on laser generation and EMAT (electromagnetic acoustic transducer) detection is proposed for residual stress measurement. A numerical method based on finite element model is established to simulate the laser-generated ultrasound in pre-stressed media to determine the capability and sensitivity of this method. Finally, the laser-EMAT ultrasonic method isstudied to measure the residual stress in bearing balls to assess the fatigue level of the bearings.