Hailiang Hou,Naval University of Engineering,China Xi Zhu,Naval University of Engineering,China Zhiyuan Mei,Naval University of Engineering,China Wei Li,Naval University of Engineering,China
<正>In order to explore the design method of blast resistant structure in ship cabin,model experiments of internal explosion were carried out using a typical ship cabin,and the blast behavior of typical missile when exploded inside ship cabin were simulated using FEM.The impact loads acted on ship structure and their characteristics were studied,the density of these impact loads and the failure mode of stiffened plates of a cabin under internal blast loads were analyzed.Results show that there are great differences between internal blast loading in a ship cabin and blast loading in an open area;besides reflected shock wave,there is converged shock wave,whose density is far greater than the reflected impact wave,acted on stiffened plates in the corner of the cabin.In addition there are multiple repeat impacts of these loading acted on the structure.The density of initial impact acted on the center of stiffened plates of ship cabin is approximately equal to that of on a plate in an open area,and density of initial impact acted on the corner of the cabin is far greater than that of on a plate in an open area.The peak overpressure and the specific impulse of converged shock wave in the corner of two gross panels are 4.8 and 5.9 times that of the reflected shock wave respectively,and which is 13.8 and 13.3 for the corner of three gross panels.The dynamic response of the gross panel under explosion inside a cabin can not be simulated under explosion in an open area.The main failure mode of stiffened plates of a cabin under internal blast loads is tearing failure along the corner with large deflection.The FEM results were in good agreement with experimental phenomena.
explosion mechanics;;internal blast loading;;experimental investigation;;cabin;;shock wave;;convergent wave
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