Shock-resistance characteristics of sandwich cylindrical shells subjected to underwater explosion

By considering acoustic－structure coupling, the strains, velocities and accelerations were calculated by the finite element method for the sandwich cylindrical shells as well as the common cylindrical shells having the same mass.The calculated results for the common cylindrical shells are consistent with the existent experimental results.Comparisons show that the sandwich protective layer can greatly reduce the intensity of the explosion shock wave.Resulted from the plastic deformation of the sandwich core, the explosion shock energy endured by the sandwich cylindrical shells are mostly dissipated.So the cylindrical shells in the sandwich layers can be protected.Compared with the common cylindrical shells, the sandwich layers can make the sandwich cylindrical shells endure stronger shock waves for the cylindrical shells with the same mass.Therefore, the outer sandwich layers can give a protection for the inner structures, and the sandwich cylindrical shells have good shock－resistance characteristics.