The Effect of Stitching Parameters on Mixed-mode Fracture Toughness of Carbon Fiber Braided Composites

• Main Authors: ching-wei chen, 陳京位
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/50521637631457002976

碩士 === 逢甲大學 === 纖維與複合材料學系 === 99 === In this study, the carbon fiber braids are stitched with Kevlar yarn as stitching yarn, and fabricate the carbon fiber braided composite specimens by hot-press method. The effects of stitching direction, stitching pitch and stitching space on mixed-mode fracture toughness of carbon fiber braided composite materials were investigated. The experiment results showed that, the fracture toughness of transverse stitched specimen are higher than longitudinal stitched one in the same stitching pitch and stitching space, but fracture toughness of longitudinal stitched specimen which 3mm stitching pitch and 6.2mm stitching space higher than transverse stitched one. The fracture toughness of specimen decrease with stitching pitch increase in the same stitching direction and stitching space, but the tendency which transverse stitched and 6.2mm stitching space are not. The fracture toughness of specimen increased with stitching space decrease in the same stitching direction and stitching pitch, but the fracture toughness of specimen which transverse stitched and 3mm stitching pitch decreased with stitching space decrease. Stitching yarn in the specimen mainly fractures at middle region of stitching yarn in transverse stitched specimen. On the other hand, stitching yarn in the specimen mainly fracture at the loop top of stitching yarn area in longitudinal stitched specimen.