Strength and Damage Mechanisms of Notched Two-Dimensional Triaxial Braided Textile Composites and Tape Equivalents Under Tension
Journal of Composites Technology and Research
The unnotched and notched (open hole) tensile strength and failure mechanisms of two-dimensional (2D) triaxial braided composites were examined. The effect of notch size and notch position were investigated. Damage initiation and propagation in notched and unnotched coupons were also examined. Four different fiber architectures were considered; braid angle, yarn and braider size, and percentage of longitudinal yarns, and braider angle varied. Tape laminates equivalent to textile composites were also constructed for comparison. Unnotched tape equivalents were stronger than braided textiles but exhibited greater notch sensitivity. Notched textiles and tape equivalents have roughly the same strength at large notch sizes. Two common damage mechanisms were found: braider yarn cracking and near notch longitudinal yarn splitting. Cracking was found to initiate in braider yarns in unnotched and notched coupons, and propagate in the direction of the braider yarns until failure. Longitudinal yarn splitting occurred in three of four architectures that were longitudinally fiber dominated. Damage initiation stress decreased with increasing braid angle.
Norman, Timothy L.; Anglin, C.; and Gaskin, D., "Strength and Damage Mechanisms of Notched Two-Dimensional Triaxial Braided Textile Composites and Tape Equivalents Under Tension" (1996). Engineering and Computer Science Faculty Publications. 232.