Dynamic response of double ring-stiffened cylindrical shell structure collided by multiple bodies

Aiming at solving the problem of the double ring-stiffened cylindrical shell structure collided by multiple bodies, a numerical simulation and a dynamic model test were carried out to explore the structural deformation, the impact force change and the energy conversion by using MSC.Dytran. Compared with the model tests, it is found that the double ring-stiffened cylindrical shell impacted by multiple bodies is a transient dynamic response process. Under enormous impact loading, shell plates in collision region will quickly generate plastic deformation; the shell impacted by multiple bodies will result in a damage to a certain degree; the impact forces will interfere with each other and then lead to the nonlinearity becoming even more significant. The results show that the external shell of the double ring-stiffened cylindrical shell can provide a better protection for the inner shell. The deformation of the structure will absorb most of the impact energy. So by optimizing the external shell's energy-absorbing efficiency a better protection against the impact can be achieved.