Research on the dynamic response of pressurized cylindrical shell structures subjected to a near-field underwater explosion

To study the dynamic response of a pressurized thin-walled circular tube structure subjected to near-field underwater explosion, deformation and damage tests cylindrical shell with different internal pressures wall thicknesses effects an explosion from 2 g explosives at stand-off distances were carried out in water tank. LS-DYNA finite element software was used carry relevant numerical simulations explore anti-explosion mechanism affected by factors including initial pressure, thickness shell, distance. The simulation inputs are high-speed photography images results shell. highlight bubble pulsation, action process deformation, energy change indicate that increase pressure can effectively improve its ability, while r = 12 cm 9 correspond same pressure. Increasing also causes deflection difference decrease. modeling may weaken ability which has Pr 0.7 MPa. After maximum displacement h 1 mm 1.5 is less than rebound distance difference. With this decrease distance, proportion high-pressure shock wave increases pulsation decreases. Specifically, proportions 30% 92% 3 cm, respectively.