The rate responses of unidirectional fiber composites at low strain rate level (range from 2E-5 to 2E-2 s-1), including tensile mechanical and stress relaxation behaviors, were investigated in this article. The results obtained showed that the ultimate tensile stress increases as strain rate increases, and the stress relaxation time decreases as pre-tensile strain rate increases. And besides, the macro-failure modes of fiber composites changed from ductile fracture feature to brittle fracture feature as strain rate increasing. Furthermore, the micro-failure modes of multi-fiber composite were investigated originally, with the results indicating that fiber-fiber interactions decreased while increasing tensile strain rate.
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