Research on Flexural Fatigue of Fiber Bundles for Lay-Flat Hose

This paper studies the flexural fatigue performance for hose reinforcement layer fiber bundles including polyester fibers, para-aramid fiber and liquid crystal polyester fiber. Bending fatigue life and changes of three fiber bundles strength during the course of fatigue development were measured. Morphology of three fiber bundles was observed by scanning electron microscopy. From the analysis of the molecular structure of the three fibers, the Molecular chain flexibility is one of the main factors of impacting resistance to bending fatigue performance. Liquid crystal polyester fiber bundles have excellent mechanical properties and the high strength retention in bending fatigue test, which is an ideal material for the production of high-strength hose.