Volume fraction of reinforcement Vf-Vf is the
total volume of reinforcement divided by the volume of
composite (reinforcement and matrix). For a composite
reinforced with meshes with square openings, Vf is equally
divided into Vfl and Vft for the longitudinal and transverse
directions, respectively. For other types of reinforcement,
such as expanded metal, Vfl and Vft may be
unequal. Examples of computation of Vf are shown in