Abstract
Elastodynamic behavior of a two-dimensional composite rectangular beam, which has regularly-spaced fibers, is formulated by a couple of finite difference equation based on FEM formulation of rectangular element. Making use of modal analysis and Duhamel integral equation, the impulse response of the composite rectangular beam is obtained. The transient response from the first incident wave through the whole oscillation of the beam is found by the series of simulation analysis. The effects of coupling oscillation of the transducer and the beam on the impulse response of incident stress wave are obtained in experiments of the ultrasonic pulse method. In addition, the effect of internal friction of the beam and the frequency dependence of damping coefficient are discussed.
