MEASUREMENT OF A SPECIMEN WITH A DISCONTINUOUS ELASTICITY VARIATION USING SPHERICAL-PLANAR-PAIR LENSES

This paper gives a mathematical formula describing an angular spectrum of an ultrasonic wave which is reflected by the flat surface of a sol id with a discontinuous variation of elastic constants. Theoretical ca lculation was compared with experimental observation, and found to sho w satisfactory agreement. The formula was developed to model the elast icity measurement of functionally gradient materials using spherical-p lanar-pair lenses.