Impact damage modeling of unidirectional composite

In order to summarize the damage behavior of the unidirectional composite subjected to high-velocity impact and give a guide to the structural design of impact-resistant materials,the response and damage of unidirectional composite in various levels of yarn and resin at different impact velocities were calculated by finite element modeling and analysis.The impact resistant properties of unidirectional composite are illustrated by analyzing the deflection-time curves,stress-time curves and damaged 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 fracture of resin and breakage of fiber tows were the main damage modes of unidirectional composite under impact loading.The damage at the bottom surface of the composite was more serious than that on the top surface owing to different modes of force acting upon them.