_pplication of the Model of Leaf and Glaskin to Estimating the 3D Elastic Properties of Knitted-fabric-reinforced Composites_______________________________________

摘要

This paper presents an analytical procedure for estimating the three-dimensional (3D) elastic properties on a plain-weft-knitted-fabric-reinforced polymer-composite material. The composite material under study is assumed to have mainly reinforcement-fiber yarns and a polymer matrix. The model of Leaf in the composite. The fabric in a representative volume is considered as a series of yarn segments, which are assumed to be made of transversely isotropic unidirectional fiber-reinforced composites. A new micromechanical modelis proposed to predict the elastic constants of the unidirectional-fiber-reinforced composites. The compliance/stiffness matrix of each yarn segment is then transformed from the mateiral co-ordiante system ot the global cordinate system.