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Elastic Wave Transmission and Stop Band Characteristics in Unidirectional Composites.pdf

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Elastic Wave Transmission and Stop Band Characteristics in Unidirectional Composites

Journal of Solid Mechanics and Materials Engineering Vol. 2, No. 9, 2008 1195 Elastic Wave Transmission and Stop Band Characteristics in Unidirectional Composites* Kazuhiro NAKASHIMA**, Shiro BIWA** and Eiji MATSUMOTO** **Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan E-mail: biwa@energy.kyoto-u.ac.jp Abstract Elastic wave transmission characteristics in unidirectional fiber-reinforced composites are studied based on the two-dimensional finite element analysis. The composite is assumed to be a lay-up of a finite number of monolayers, each of which contains a single row of fibers spaced at equal distance. Influences of the stacking number and misalignment of monolayers as well as the presence of coating layer around the fibers on the wave transmission spectra are demonstrated for unidirectional SiC-fiber-reinforced Ti-alloy composites. It is shown that the transmission coefficients fall to low values in certain bands of frequency, i.e., stop bands in terminology analogous to perfectly periodic structures. This feature is found to appear more clearly for the transverse wave incidence, irrespective of the misalignment of monolayers. The stiffness reduction of the coating layer is shown to shift the stop bands to lower frequencies, which can be a useful feature for the monitoring of the fiber/matrix interfacial damage. Key words: Elastic Wave Propagation, Stop Band, Metal-Matrix Composite, Finite Element Method, Harmonic Wave, Transmission Spectrum 1. Introduction Fiber-reinforced composites are used in many applications owing to their enhanced mechanical properties that can be tailored for specific purposes. Propagation of elastic waves in these composites is an important issue regarding not only their dynamic response but also their nondestructive characterization using ultrasonic waves. Elastic waves in these composites are subjected to multiple scattering by their micros