Investigation on dynamic response of liquid-filled cylindrical shell structures under the action of combined blast and fragments loading

This study designs four types of liquid-filled cylindrical shell structures to investigate their protection characteristics against explosive shock waves and high-speed fragments. Bare charge and charge-driven prefabricated fragments are employed to examine the damage under blast shock waves and combined blast and fragments loading on various liquid-filled cylindrical shell structures. The test results are compared to numerical calculations and theoretical analysis for the structure's deformation, the liquid medium's movement, and the pressure waves' propagation characteristics under different liquid-filling methods. The results showed that the filling method influences the blast protection and the structure's energy absorption performance. The external filling method reduces the structural deformation, and the internal filling method increases the damage effect. The gapped internal filling method improves the structure's energy absorption efficiency. The pressure wave loading on the liquid-filled cylindrical shell structure differs depending on filling methods. Explosive shock waves and high-speed fragments show a damage enhancement effect on the liquid-filled cylindrical shell structure, depending on the thickness of the internal liquid container layer. The specific impulse on the inner surface of the cylindrical shell positively correlates to the radial deformation of the cylindrical shell structure, and the external liquid layer limits the radial structural deformation.