Verification of ultrasonic residual stress evaluation method by laser hologram method

Based on the acoustoelasticity, the residual stress can be measured by ultrasonic method. Experimental system to measure the residual stress by ultrasonic is established with Lcr waves. The longitudinal stress of twin wire welded plate is measured by the system. The result of the ultrasonic method is verified by laser hologram interference hole-drilling method. The measurement processes of two methods are compared. The measurement process is not only nondestructive, but also real-time and quick. The system is portable and overcomes the shortcomings of the tradition methods.