LAUSR

Abstract Three-dimensional structural dynamics of a submerged fluid-filled circular cylindrical shell subjected to an external shock wave is addressed for the scenario of different internal and external fluids. A semi-analytical model based on the use of the classical apparatus of mathematical physics is employed, and the focus of the study is on understanding how the peak values of the compressive and tensile stress evolve when the acoustic properties of the internal fluid change. It is demonstrated that the peak tensile stress can be very sensitive to such changes, while the respective response of the peak compressive stress is quasi-linear. It is also shown that for the present system, it is not always possible to rely on the parametric studies based on the use of simplified, computationally cheaper two-dimensional models even when conservatives estimates of the peak stress are sought because the peak stress values predicted by such models can be both higher and lower than the values predicted by the more realistic, fully three-dimensional models. The dominance of the transverse stress over the longitudinal one is established for all scenarios considered. The spatial and temporal locations of the stress peaks are analyzed as well, and the practical implications of the respective findings are highlighted.