BFRP reinforcing hierarchical stiffened SMC protective structure

To improve the anti-blast ability of sheet molding compound (SMC) protective structure, basalt fiber reinforced polymers (BFRPs) are applied to strengthen SMC and improve its stiffness and strength. To simultaneously guarantee the overall and local rigidities, the panel adopts hierarchical orthogrid-stiffened structure. Explosion experiments were carried out to reveal the blast resistance of the BFRP reinforced SMC door. With much lighter mass, the BFRP-SMC protective door exhibits excellent anti-balst ability and would be an ideal substitute for metallic or concrete protective doors. Equivalent method based on identical volume and mode superposition was adopted to build dynamic theory of blast-loaded hierarchical stiffened panels. Equivalent static load method was adopted to predict the maximum displacement of the blast-loaded panel. These two methods are reliable and provide simple ways to design hierarchical stiffened composite protective structures.