SYMPOSIA PAPER Published: 01 January 1986

Elastic Stiffness of Three-Dimensional Braided Textile Structural Composites


A methodology based upon the concept of fabric unit cell structure and an energy approach has been developed for studying the elastic properties of three-dimensional fabric composites. In general, the unit cell assumes the shape of a parallelepiped with its size determined by the weaving parameters. The yarns can assume the positions along the edges and diagonals in a unit cell, and each unit cell is centered around an “interlock” of yarns. To facilitate the analysis of complex yarn interactions, the unit cell is projected onto mutually orthogonal planes. Strain energies due to yarn axial extension, bending, and lateral compression are then considered in the two-dimensional plane weave structures. Closed-form expressions for axial elastic moduli and Poisson's ratios have been derived as functions of fiber volume fractions and fiber orientations. Numerical examples and experimental results of elastic properties for three-dimensional braided composites are presented.

Author Information

Ma, C-L
University of Delaware, Newark, DE
Yang, J-M
University of Delaware, Newark, DE
Chou, T-W
University of Delaware, Newark, DE
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Developed by Committee: D30
Pages: 404–421
DOI: 10.1520/STP35360S
ISBN-EB: 978-0-8031-4963-2
ISBN-13: 978-0-8031-0447-1