Abstract
Application of conventional ultrasonic nondestructive evaluation techniques to CCSS components in nuclear power plants has been limited principally due to the anisotropy of CCSS materials. Phenomena such as beam skewing and distortion are directly attributable to this anisotropy and cause severe difficulties in defect detection and sizing. The present investigation is intended to use Lamb waves as the probing mechanism to detect and characterize a surface‐breaking crack residing on an interior surface not accessible by the ultrasonic probe. Experimental investigation is directed at several techniques for exciting and detecting Lamb waves in this application. The excitability of various Lamb‐wave modes in the fd (frequency times thickness) range of interest and the effects of anisotropy and surface curvature on mode propagation characteristics are also studied. Signals due to mode conversion and crack diffraction are used to develop an interpretation procedure for crack detection and sizing. [Work supported by EPRI under contract RP2405‐23.]
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