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The interaction of ultrasonic bulk waves at an imperfect interface is considered based on a linear spring model. In this model, the tractions are supposed to be proportional to the slip fields at the boundary, which results in attenuation of a part of wave energy. Using the wave field correction approach, the energetics of ultrasonic waves that obliquely impinge at the imperfect boundary between an elastic solid and rigid surface is investigated theoretically. Two possible boundary phases, namely slip, and separation, are considered at the interface, which imposes the inequality constraints at the boundary. The effective energy partition in the reflected waves is determined and studied numerically. It is observed that the interface imperfection have a significant effect on the energetics of the reflected waves. The analysis and measurements of reflected ultrasonic waves at such interfaces are often used for monitoring and the better understanding of the interfacial defects and irregularities.
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