Development of ultrasonic knowledge base for evaluation of interface damage

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An ultrasonic knowledge base has been developed for the evaluation of interface defects of structural materials. The knowledge base is based on elastodynamic theory and experimental measurement. A system to e valuate an interface defect has also been proposed. The following is the summary of results in each phase of the research.1. Knowledge base from elastodynamic theory(1) Introduction of the spring model is a versatile way to represent the various situations of interface conditions.(2) To evaluate the elastodynamic far-fields, it is important to introduce the following two steps:a) evaluation of near-fields by using the full space Green's function andb) evaluation of far-fields by using the Green's function which satisfies the interface condition.(3) Back-scattered wave fields from interface defects have been calculated in some configurations of pulse-echo and pitch-catch methods of ultrasonics.2. Knowledge base from experimentComplemental back-scattered wave fields have been accumulated from experimental measurements.3. Development of evaluation systemA neural network system to evaluate a defect has been proposed by utilizing the knowledge base developed in the phases of 1. and 2.