| Summary: | 碩士 === 大葉大學 === 機械與自動化工程學系 === 100 === Underwater explosion usually has two stages, including shock wave and bubble pulse. When shock wave and free surface interact, this will produce bulk cavitation. During the bubble pulse stage, the bubble will experience expansion and contraction in the collapse phase of bubble, a high-speed jet is produced. Bulk cavitation and high-speed jet may cause serious damage for ship structure. So this paper presents a study about the effect of bulk cavitation and high-speed jet on structures in an underwater explosion.
To investigate the such problems mentioned above, the Finite Element Method (FEM) was applied. The Couple Eulerain-Lagrangian technique embed in ABAQUS software was used to solve the ship structural dynamic responses subject bulk cavitation and high-speed jet induced by underwater explosion in simulation. Furthermore, in this present paper, the response of a plate due to the shock wave induced by underwater explosion was also studied and verified by experimental study of Ramajeyathilagam & Vendhan[35]. For studying the effects of bulk cavitation and high-speed jet, a ship model was used as the object of study. The numerical result in this study may provide same helpful informations for the shipdesign work.
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