Residual stress distribution measurement method and residual stress distribution measurement device

摘要

PROBLEM TO BE SOLVED: To provide a residual stress distribution measurement device and a residual stress distribution measurement method that can directly measure residual stress distribution in an object to be measured.;SOLUTION: Beam acquisition parts 40a and 40b direct laser beams L3 to positions where ultrasonic waves of a longitudinal wave, a rolling-direction-displaced transverse wave and a width-direction-displaced transverse wave generated by ultrasonic wave generation parts 20a and 20b return to the surface of an object 2, and acquires reflected laser beams L3. According to waveform data indicating frequency variations in the laser beams L3 detected by interferometers 50a and 50b, a computer 70 computes a propagation time of each ultrasonic wave generated in each progress direction, and computes a horizontal distance between the generation position and detection position of each ultrasonic wave. After the sonic speed of each ultrasonic wave in each layer of the object 2 divided in a thickness direction is computed according to the propagation time and the horizontal distance, according to the longitudinal wave sonic speed in each layer, an internal temperature of each layer is obtained, and according to the sonic speed of each ultrasonic wave and the internal temperature, a residual stress in each layer is computed.;COPYRIGHT: (C)2004,JPO