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In this work, an estimation of the reinforcement factor of the Halpin-Tsai equations used to calculate the transverse stiffness E-2 is provided. An improved estimation of the value xi = 2 originally proposed by Halpin and Tsai is given through a set of finite element analyses that consider randomly distributed unidirectional fibers for different volume fractions. The analysis overcomes the original hypothesis of a square array distribution of fibers in the transverse plane. It is concluded that a value of xi = 1.5 is a better estimation for the usual volume fractions found in practice for a unidirectional lamina of fiber reinforced composites.
Reinforcement factor; Transverse stiffness; Unidirectional lamina; Finite element analysis