Effect of braid angle and waviness ratio on effective moduli of 22 biaxial braided composites
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abstract
One of the driving forces for the increasing structural application of textile composites is the potential to tailor the material microstructure to meet specific thermomechanical requirements. In order to fully exploit this potential, thorough understanding of the effect of various factors on the behavior of the material is essential. This paper focuses on understanding the effect of braid angle and tow waviness on the effective moduli of 22 biaxial braided composites. To achieve this goal, full three-dimensional finite element micromechanics models were developed first. Then extensive parametric study was conducted for typical glass fiber/epoxy (S2/SC-15) and carbon fiber/ epoxy (AS4/411-350) material systems. The effects of tow waviness and braid angle on the effective engineering properties were determined for a wide range of braid angles and waviness ratios. Equivalent laminated materials with angle plies and a resin layer were also used to produce reference values for comparison. The results are presented and discussed. The transverse properties of the 22 biaxial braids are most sensitive to the change of braid angle and waviness ratio. The inplane properties of the braid can be well predicted by the classical laminate theory for a range of small waviness for the carbon fiber/epoxy material.
