Research on low-velocity impact resistance of double-layer M-shaped GFRP foldcore sandwich structure

In this paper, the double-layer M-shaped GFRP foldcore sandwich structure was prepared by the hot pressing method. Subsequently, low-velocity impact experiments were carried out on the node and base positions of the structure using two different shapes of impactors. The experimental results show a difference in the dynamic response of the two positions after impact. At the node position, the upper foldcore has a higher capacity to resist the impact load. While at the base position, the impact load is mainly carried by the lower foldcore. The difference in energy absorption between the two impact positions is small when the sandwich structure is penetrated. The research results of this paper provide a reference for reducing the difference in impact resistance between the node position and the base position.