RT Journal Article T1 Estimation of the reinforcement factor [epsilon] for calculating the transverse stiffness E2 with the Halpin-Tsai equations using the finite element method A1 Giner, Eugenio A1 Vercher Martínez, Ana A1 Marco Esteban, Miguel A1 Arango, Camila AB In this work, an estimation of the reinforcement factor [epsilon] of the Halpin–Tsai equations used to calculate the transverse stiffness E[subíndice 2] is provided. An improved estimation of the value [epsilon]=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 [epsilon]=1.5 is a better estimation for the usual volume fractions found in practice for a unidirectional lamina of fiber reinforced composites. PB Elsevier SN 0263-8223 YR 2015 FD 2015-06-01 LK https://hdl.handle.net/10016/36050 UL https://hdl.handle.net/10016/36050 LA eng NO The authors wish to thank the Ministerio de Economía y Competitividad for the support received in the framework of the project DPI2013-46641-R and the Generalitat Valenciana, Programme PROMETEO 2012/023. DS e-Archivo RD 27 jul. 2024