The dynamic characteristics of composite laminates are very complex because many concurrent phenomena occur with laminate failure under impact load. In order to research impact response and energy distribution of composite laminates in different low-impacted energies, Hashin failure criteria was taken based on the finite element software of ABAQUS, combined progressive damage stiffness reduction scheme with viscous regularization. The impact response was analyzed from the points of impact energy, contact pressure,internal energy and damage dissipation energy. The result showed that the peak of contact pressure moved forward and the different value of internal energy and damage dissipation energy became bigger with the increase of impact energy. Furthermore, impact energy would be transformed into many types of energies and the distribution of impact energy was discussed.

The effect of graphene was investigated on photorefractivity in the composite consisting of hole transporting poly(N -vinyl carbazole) (PVK) (44.5 wt%), electro-optically active 4-(azepan-1-yl) benzylidenemalononitrile (7-DCST) (35.0 wt%), plasticizing dibutyl phthalate (DBP) (20.0 wt%), and photosensitizing fullerene (C₆₀) (0.5 wt%) by changing the amount of graphene from 0 to 0.1 wt% and monitoring the two beam coupling gain coefficient. It is found that the gain coefficient drastically increased by the addition of graphene and reached maximum at the content of around 0.005-0.007 wt% (e.g., it was 112 cm^-­1 at 41.7 V/μm at 0.005 wt%). Beyond the maximum, the gain coefficient went through the local minimum value at around 0.05 wt%, and then gradually increased till 0.1 wt%. These results suggested that at the lower content, graphene worked as trap sites, and at the higher content, the nature of trap sites was changed by the onset of the overlap of graphene sheets.