Interlaminar Fracture Toughness of Carbon Fiber/Epoxy Composites using Short Kevlar Fiber and/or Nylon-6 Powder Reinforcement

✍ Scribed by B. Y. Park; S. C. Kim; B. Jung

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 455 KB
• Volume: 8
• Category: Article
• ISSN: 1042-7147
• DOI: 10.1002/(sici)1099-1581(199706)8:6<371::aid-pat658>3.0.co;2-i

✦ Synopsis

Mode I (G IC ) and Mode II (G IIC ) interlaminar fracture toughness of carbon-fiber/epoxy composites have been investigated as a function of the amount of short Kevlar-29 fiber (SKF) and/or Nylon-6 powder (N6P) between continuous fiber layers. G IIC increased with increasing crack length as a consequence of the presence of SKFs bridging in the wake of propagating crack. G IIC of SKF alone could reach the maximum at an intermediate amount of SKF. G IIC of SKF and N6P was lower than that of SKF alone because N6P prevented the orientation of SKF to out-of-plane. The extent of SKF's bridging

phenomenon may be influenced by the amount and orientation of SKF. G IC showed no significant effect with SKF and uniform irrespective of crack length. Scanning electron microscopy after G IIC test showed that new surfaces were created by extensive fiber bridging, pull-out and fracture of SKF in random direction without any fixed pattern.