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Micromechanics of high-rate loaded composite media

In a composite ply the nature of wave propagation is closely associated with the alignment of fibres (for the unidirectional case) and warp and weft arrangements (for the woven case) among other parameters, e.g. fibre volumetric fraction, relative fibre-matrix moduli, etc. As wave propagation characteristics in a laminated composite depend on features of wave motion in a single ply which in its own right is contingent upon the degree of reflection and refraction of elastic waves from fibre-matrix interface zone the study of micromechanics of mechanism of wave propagation is essential in acquisition of understanding of related phenomena (stress wave patterns, damage and fracture, etc.). It is thus important to acquire the knowledge of the latter, as a logical antecedent, for the former to transpire. Geometric alterations may be introduced in fibres to increase fibre-matrix interface fracture energy and strength through interlocking mechanisms. Wave reflection and refraction due to impedance mismatch and curvature will also form an interesting part of the study. These will also render it possible to manipulate wave propagation as required. Thus it would be interesting to look into wave propagation in such structures from a micromechanical viewpoint.

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