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Experimental investigations on small-and full-scale ship models with polyurea coatings subjected to underwater explosion

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Defence Technology（防务技术） 2022年第7期18卷 1257-1268页

作者： Jian Liu Feng-jiang An Cheng Wu Sha-sha Liao Ming-xue Zhou Dong-yu Xue Huan Guo State Key Laboratory Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

Nowadays, the mitigation of damage to a ship caused by the underwater explosion attracts more and more attention from the modern ship designers. In this study, two kinds of scale tests were conducted to investigate the effects of polyurea coatings on the blast resistance of hulls subjected to underwater explosion. Firstly, small-scale model tests with different polyurea coatings were carried out. Results indicate that polyurea has a better blast resistance performance when coated on the front face, which can effectively reduce the maximum deflection of the steel plate by more than 20% and reduce the deformation energy by 35.7%-45.4%. Next, a full-scale ship(approximately 50 m × 9 m) under loadings produced by the detonation of 33 kg of spherical TNT charges was tested, where a part of the ship was coated with polyurea on the front face(8 mm + 24 mm) and not on the contrast area. Damage characteristics on the bottom were statistically analyzed based on a 3D scanning technology, indicating that polyurea contributes to enhancing the blast protection of the ship. However, damage results of this test were different from those of the small-scale tests. Moreover, the deformation area of the bottom with polyurea was greatly increased by 40.1% to disperse explosion energy, a conclusion that cannot be drown from the small-scale tests.

关键词： Polyurea coatings Small-scale model full-scale ship Underwater explosion Blast resistance

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Parallel Computing of the Underwater Explosion Cavitation Effects on full-scale ship Structures

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Journal of Marine Science and Application 2012年第4期11卷 469-477页

作者： Zhi Zong Yanjie Zhao Fan Ye Haitao Li Gang Chen School of Naval Architecture Engineering Dalian University of Technology Dalian 116024 China Marine Design & Research Institute of China Shanghai 200011 China

As well as shock wave and bubble pulse loading, cavitation also has very significant influences on the dynamic response of surface ships and other near-surface marine structures to underwater explosive loadings. In this paper, the acoustic-structure coupling method embedded in ABAQUS is adopted to do numerical analysis of underwater explosion considering cavitation. Both the shape of bulk cavitation region and local cavitation region are obtained, and they are in good agreement with analytical results. The duration of reloading is several times longer than that of a shock wave. In the end, both the single computation and parallel computation of the cavitation effect on the dynamic responses of a full-scale ship are presented, which proved that reloading caused by cavitation is non-ignorable. All these results are helpful in understanding underwater explosion cavitation effects.

关键词： underwater explosion cavitation parallel computation full-scale ship

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