Journal
JOURNAL OF THE TEXTILE INSTITUTE
Volume 91, Issue 1, Pages 132-150Publisher
TEXTILE INST INTL HEADQUARTERS
DOI: 10.1080/00405000008659494
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This paper presents an analytical procedure for estimating the three-dimensional (3D) elastic properties of 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 and Glaskin for plain-weft-knitted fabrics is used to determine the geometrical description of the yam in the composite. The fabric in a representative volume is considered as a series of yam segments, which are assumed to be made of transversely isotropic unidirectional fiber-reinforced composites. A. new micromechanical model is proposed to predict the elastic constants of the unidirectional-fiber-reinforced composites. The compliance/stiffness matrix of each yam segment is then transformed from the material co-ordinate system to the global coordinate system. In contrast to the commonly used Voigt and Reuss averaging methods, a volume-averaging scheme is developed to obtain the over-all compliance/stiffness matrix of the knitted-fabric composites. The predicted results are found to be is good agreement with experimental data. The effects of the fiber content and other parameters of the knitted fabric on the elastic properties of the composite material are described.
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