numerical simulation of CEL explosion over metal tube in the depth of water in Abaqus

In this tutorial numerical simulation of CEL explosion over metal tube in the depth of water in Abaqus has been investigated.An underwater explosion can be divided into two stages: the shock wave and the bubble pulse. Although both inflict severe damage to the adjacent structure, their damage mechanisms are different. Generally, the pressure caused by the shock wave is very high but the duration is very short. On the other hand, the pressure caused by the bubble pulse is lower (only 10%–۲۰% that of the shock wave) but is of a much longer duration, resulting in a force of comparable momentum. Therefore, both the shock wave and the bubble pulse should be considered when examining a near-field underwater explosion.You can see a figure of assembled part at below

The shock wave causes great damage to a structure whose natural period is of the order of milliseconds and, therefore, usually causes only local damage to a ship. However, the bubble pulse can cause global damage to a ship following an explosion, resulting in a whipping motion if the frequency approaches the eigenfrequency of the ship. In recent years, there has been considerable interest in evaluating the role of the fluid-structure interaction (FSI) in the blast response of a structure. Taylor was among the first to study the momentum transferred to a freestanding plate from a pressure wave with an exponential profile.Dynamic explicit procedure is appropriate for this type of analysis. General contact with default property has been selected. To define air property ideal gas data,TNT JWL data,water Us-Up parameter and for aluminum tube Johnson-Cook plasticity data has been used.

after detonation, the shock wave propagated into the water and the pipe has a large deformation and compaction after the contact with shock waves .You can see some figures of the results at below

You can provide CAE ,INP,and English video files of this simulation here. The cost of these files is Twenty-Six Euros. you can click on the bellow bottom to beginning process

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