Abstract: Incorporated with finite element software package ABAQUS to calculate the impact responses of unidirectional composite in yarn and resin levels. The impact resistance properties and main energy absorption mechanisms of unidirectional composite are illustrated by analyzing the bullet velocity-time curve, impact stress distribution in different components of unidirectional composite which compared with those of pure resin material. The impact energy was absorbed by the unidirectional composite during a short period of time; this induces a better energy absorption performance for the unidirectional composite. In addition, the peak value of stress in the yarn is greater than that in the resin. It is concluded that the impact energy is mainly absorbed by the reinforcement of yarns in the unidirectional composite. This leads to a better impact resistance performance for the unidirectional composite than the pure resin material.

Key words: unidirectional composite , pure resin material , impact , finite element