Paper number 578


Joon-Hyung Byun

Composite Materials Lab, Korea Institute of Machinery and Materials
66 Sangnam-Dong, Changwon, Kyungnam, South Korea

Summary An analytic model based upon the unit cell was developed to predict geometric characteristics and three-dimensional engineering constants of 2-D (two-dimensional) triaxially braided textile composites. The crimp yarn angle and the fiber volume fraction were obtained from the geometric model. The elastic model utilizes the coordinate transformation and the averaging of stiffness and compliance constants based upon the volume of each reinforcement and matrix material. Seven different fabric architectures have been fabricated and tested in tensile load to verify the model. The classical lamination theory has also been applied to the braided composites to compare the predictions with the averaging method. Although two analytic approaches are well correlated with experimental results, the averaging method is more accurate when the braider yarn angle is small or when the bundle size of axial yarns is much larger than that of the braider yarns.
Keywords braided textile, unit cell, geometric model, stiffness model, engineering constants, coordinate transformation, fabric architecture, averaging method.

Theme : Textiles ; Braided Structures

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