Curved convex face residual stress measurement by ultrasonic method

An ultrasonic residual stress measurement system was developed to detect residual stress on curved convex face with one-emit-one-receive transducer. Compared with the results of laser holography orifice method,the distribute section of tensile stress and compression stress are similar,both max tensile and compression stress of ultrasonic method are much lower than that of laser holography orifice method,and stress distribution line is more gently as well. According to the couple condition of transducer and analysis of the nominal acoustic coefficient,the results of ultrasonic residual stress measurement on curved convex face should be corrected with radius of curvature in order to get precision residual stress.