This paper presents the results of a study concerning the protective capacity of ship hull structures made of sandwich composite materials subject to an explosion impact. The main application of these structures lies in design of ship structures of great importance, which should also be protected against exceptional loads of this kind. A nonlinear analysis with the finite-element computer code COSMOS/M was done. The methodology for the blast pressure charging and the mechanism of the blast wave in free air are given. The spatial pressure variation is determined by using Friedlander exponential decay equation. Various scenarios (parametric calculus) to evaluate the behavior of the ship structure sandwich plate to blast loading are presented: explosive magnitude, distance from source of explosion, plate thickness.
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