Abstract
The effect of fiber waviness on the elastic moduli of unidirectional fiber composites was investigated theoretically. All fibers are assumed to be laid parallel to each other and have a sinusoidal curvature. A few geometric relations were derived among the wave length, the amplitude and the fiber length of a sinusoidal shaped fiber. Then, linear elastic constitutive equations were established for two kinds of fiber arrangements: (1) the iso-phase model, and (2) the random-phase model. Finally, the Young's moduli in longitudinal and transverse directions were examined by numerical examples.
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