Özet:

Underwater explosions are tremendously hazardous for floating structures and human life inside. When compared to an air blast, an underwater blast is more effective due to the effect of the fluid domain. Therefore, the design of marine structures with high strength to underwater explosions is a difficult subject as well as important. With the rapid progression of material technology, composite materials are widely preferred over metals in fields of marine and defense industries due to low density, high elasticity and high strength in their nature. In this study, a sandwich panel with a soft-core was modelled using the finite element method, and the dynamic behavior of the panel subjected to an underwater blast load is investigated. In the validation study of the model and method, firstly, the dynamic responses of the carbon epoxy composite plate structure subjected to underwater explosion load were confirmed with the results available in the literature. In this part, ALE (Arbitrary Lagrangian-Eulerian) and Load_SSA (Sub Sea Analysis) methods were used to simulate the dynamic response of the plate and a very good agreement was observed by using the ALE method. Then, the composite sandwich panels with a soft-core (foam) were investigated by the finite element-based ALE method. Finally, the maximum deflection results of the plate structure subjected to underwater explosion loads were examined with parametric studies. Increasing core layer thickness caused a decrease in plate deflections and an increase in post-explosion oscillation frequency under the same blast conditions.

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