Abstract:Three dimension hollow sandwich composites (3D composites) with pile height of 5, 6 and 7 mm
were selected as object of study. In order to study low-velocity impact properties of the 3D composites, low-velocity
impact testing was conducted by using drop hammer low-velocity impact tester at energy of 8 J. In addition, compressive
strength of the 3D composites before and after impacting was tested by using universal material testing machine
(Instron 3385H) for studying compressive damage tolerance of the 3D composites suffering low-velocity impact loads.
The results indicate that the 3D composites were sensitive to low-velocity impact loads. Low-velocity impact properties
increased with the increase of pile height of the 3D composites. Residual compressive strength of the 3D composites
declined sharply after suffering low-velocity impact loads. The results contribute to the optimal design of the 3D sandwich
composites.
