Abstract
The analytical method decribed in the authors' previous paper is utilized to calculate the elastic moduli of unidirectional fiber-reinforced composites modelled by a square array acking of fibers. A π/4-rotated model of the psquare array isconsidered to calculate in-transverse-plane shear modulus for convenience of using a Fourier cosine series. Numerical results show that elastic symmetry of a composite modelled by a square array is the same as tetragonal crystal class. The transverse elastic moduli, ET, GTT, and νTT, varyin the transverse plane when such a symmetry exists, whereas the longitudinal shear modulus, GLT, is constant. The average values of those moduli, except for GLT, are very close to the corresponding values for the hexagonal array. Those results are almost independent of material and geometrical parameters. Off-axis properties are also obtained using independent moduli.
