Fatigue Behavior of Hybrid Flax-Carbon Composites

Islam, M. Z., North Dakota state University
Amiri, A., North Dakota State University
Ulven, C. A., North Dakota State University
Hybridization of natural fiber with synthetic fiber to reinforce polymer matrix composites is an effective way of increasing fatigue strength of composites with substantial amount of bio-based content. Flax is the strongest type of bast natural fiber, possessing excellent mechanical and damping properties. Fatigue properties of flax fibers hybridized with synthetic carbon fibers as reinforced polymer matrix composites were studied. Fatigue properties of layered flax-carbon composite was compared to composite with flax-carbon fiber woven together through fatigue testing at 70% load of ultimate tensile strength and with a loading frequency of 3 Hz. Flax-carbon fiber woven together composite exhibited a very large increase in fatigue life compared to layer flax-carbon composites. Suitable hybridization can produce hybrid composites that are as strong as synthetic fiber composites while containing a high bio-based content of natural fibers.