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Title: Analysis and modeling of plain knitted fabric reinforced composites
Authors: Ramakrishna, S. 
Keywords: Analytical model
Cross-over model
Elastic properties
Fiber orientation
Geometric model
Knitted fabric composites
Issue Date: 1997
Citation: Ramakrishna, S. (1997). Analysis and modeling of plain knitted fabric reinforced composites. Journal of Composite Materials 31 (1) : 52-70. ScholarBank@NUS Repository.
Abstract: This paper presents the analysis and modeling of elastic properties of plain knitted fabric reinforced composites. Knitted fabric is formed by interlocking of looped yarns. Knitted fabric composite is heterogeneous with impregnated curved yarns and resin rich regions. Firstly, the three-dimensional orientation of yarns was expressed in terms of known parameters of the knitted fabric; these parameters are course density, wale density and impregnated yarn diameter. An analytical model named "cross-over model" has been proposed. This model considers the crossing over of yarns of adjacent loops at the interlocking region. The average effective elastic properties of each curved yarn were determined using the stress-strain relations for a lamina of arbitrary orientation. Using classical lamination theory, the effective elastic properites of the yarns in the cross-over model were determined. Finally, the elastic properties of the composite were determined by combining the effective elastic properties of the curved yarns and the resin rich regions. It has been shown that the cross-over model provides a rough estimate of the elastic modu-lus of the knitted fabric composite (volume fraction of fibers, Vf = 9.5%) by comparing theoretical predictions with the experimental results. However, it is to be noted that at higher Vf, the geometry of knit loop would be distorted thus the model accuracy would be affected.
Source Title: Journal of Composite Materials
ISSN: 00219983
Appears in Collections:Staff Publications

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