Development of innovative ultrasonic nondestructive evaluation considering properties of phononic cristal

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The objectives of this research project is to develop innovative numerical methods for analyses of ultrasonic wave propagation in phononic cristal and to apply numerical results of the wave propagation analysis to investigate a next-generation ultrasonic nondestructive evaluation technique. The following results were obtained. 1. The fast simulation method for ultrasonic wave propagation in phononic cristal was developed on the basis of a boundary element method in conjunction with fast multipole method and adaptive cross approximation. 2. The program code for the analysis of band structures of phononic cristal was created to make it possible to clarify the frequency band of peculiar wave propagation. 3. The developed code was applied to simulate wave propagation and scattering of elastic waves including unusual phenomena like stop band generated at specific frequencies.