Influence of a rigid coaxial core on the stress-strain state of a submerged fluid-filled circular cylindrical shell subjected to a shock wave

Abstract A submerged fluid-filled circular cylindrical shell containing a rigid coaxial cylindrical core is considered. The nonstationary dynamics of such a system subjected to an external spherical shock wave is examined, with particular emphasis on the influence that a core has on the stress–strain state of the shell. A complete diffraction–radiation problem is considered, and an analytical–numerical solution of the problem is obtained. The influence of several different cores is analyzed, and a comparison to the case of a shell without a core is presented. Physical phenomena occurring in the shell and in the internal fluid are studied in detail. Two- and three-dimensional graphics is used to illustrate and analyze the nonstationary dynamics of the stress–strain state. The possibility of using a rigid core as a measure of constructive safety improvement is discussed.

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