Abstract: In order to summarize the damage behavior of the unidirectional composite subjected to high-velocity impact, which will benefit to the structural design of impact-resistance materials. The response and damage of unidirectional composite in the levels of yarn and resin at different impact velocity were calculated by finite element modeling and analysis. The impact resistance properties of unidirectional composite are illustrated by analyzing the deflection-time curves, stress-time curves and damage morphologies under different impact velocities. During the process of high-velocity impact, the amplitudes of stress and deflection decreased all the time due to the impact energy absorbed and dissipated by the unidirectional composite. In addition, the damage of resin and breakage of fiber tows were the main damage modes of unidirectional composite under impact loading. Furthermore, the damage on bottom surface of the composite was more serious than that on top surface owing to their different load-bearing modes.

Key words: unidirectional composite, impact, damage, finite element