The use of the ultrasonic wave technology was expected to be one of the most important technologies in health monitoring of composite materials and/or structures. However, the propagation of ultrasonic waves becomes very complicated for polymer based composite materials due to reflection, transmission, dispersion, etc, which may occur on the interface of matrix and reinforcements. Therefore, in this paper, the elastic wave motion equation was dispersed using the finite element analysis of the PZFlex code; then the propagation of ultrasonic wave in several model composite materials was simulated. Then, the influence of the fiber/matrix interface shape, fiber size and other fiber conditions on wave propagation behavior was clarified. Moreover, the complicated wave propagation resulting from reflection, transmission and refraction on the fiber/matrix interface was visualized and the influence of the fiber arrangements and fiber volume fraction on the ultrasonic wave behavior was investigated for both conditions with and/or without attenuation in matrix.
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