| The purpose of this study is to investigate the edge delamination in fabric composites subjected to various thermal cycles. Coupons of [±30 2/903/∓302] S were composed of 7781 fabric and three resin systems, SI-ZG-5A, SI-BUI and RS-E9 Resin. Each one was individually subjected to room temperature, 10 thermal cycles and 60 thermal cycles and were tested for edge delamination.; Static tests indicate delamination occurs between the 90° and the −30° layers and in between ±30° layers for the specimens with SI-BUI Resin system and no thermal cycle. For the coupons with 10 and 60 cycles no visible delamination has been observed before the final failure. The coupons with SI-ZG-5A resin are the most susceptible to edge delamination. The coupons with RS-E9 resin system exhibit some matrix cracks and some isolated delamination between the +30° and the −30° layers at the edge of the coupon. However, no significant delamination was observed before the final failure.; A sharp change in the stiffness of the laminate in a simple tensile was observed.; Finite element analysis was performed so as to predict the most susceptible interface at which delamination is to take place. (Abstract shortened by UMI.)... |
