DAMAGE EVALUATOR FOR ROTOR CENTER HOLE

摘要

PURPOSE:To determine the degree of damage in a non-destructive manner and with a high accuracy, by making a judgement based on relationship between growth of a fine damage generated in the surface of a member early in the life and the life itself. CONSTITUTION:A damage detector 6 is inserted into a center hole 15 of a turbine rotor 14 and linked to a driving rod 7 to be moved axially. The driving rod 7 is provided successively to a driving section 8 and a specified amount of movement and position thereof are detected. The height-wise movement of the driving rod is linked with a connecting column 16 to adjust the amount of movement thereof with a vertical movement driving section 9. A signal from the detector 6 is turned to an image proper in the focus and magnification with a CRT 10 and an image controller 11 and an image processor 12 calculates the size of damage and samples sampling of data. The damage sampled is statistically processed with an arithmetic decision device 13 and the degree of damage of an object area is displayed on the CRT 10 containing various statistical evaluations including a mean and dispersion.