爆炸载荷作用下玻璃钢/硬质聚氨酯泡沫夹层结构抗冲击性能实验研究

Air blast tests were conducted to investigate the dynamic response and blast resistance of polyurea coated glass fiber reinforced plastic (GFRP) sandwich structure, GFRP sandwich structures with single rigid polyurethane foam core layer and with two rigid polyurethane foam core layers. All sandwich structures have the same areal-density. The failure modes of three kinds of panels were founded and the impact resistance of three structures was compared. The results show that the failure modes of the panel includes shear fracture at fixed boundary, bending crack at the corner and shear crack at the place with stress concentration. Crushing zone, crack coalescence zone, debonding with panels and tensile crack are observed in the core layers. The damage degree and residual deformation of GFRP sandwich structures with two rigid polyurethane foam core layers and polyurea coated GFRP sandwich structure with polyurea on front surface are larger than those of GFRP sandwich structure with single rigid polyurethane foam core layer. The damage degree of polyurea coated GFRP sandwich structure with polyurea on back surface is larger than that of GFRP sandwich structure with single rigid polyurethane foam core layer, however, the residual deformation of the back panel is significantly reduced.