Growth law analysis for strain and deflection of steel circular plates subjected to multiple underwater explosions

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (5) : 131-136.

LI Xudong1,2, YIN Jianping1, DU Zhipeng2, ZHAO Pengduo2, ZHANG Chunhui2, LI YING2,3, ZHANG Fei1,2

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Abstract

In sea wars, surface ships and submarines may be attacked by multiple missiles or torpedoes.Cumulative damages produced affect sustained combat capability and vitality of surface ships and submarines.Here, continuous underwater explosion loading tests were conducted for an air back liner steel circular plate with diameter of 390 mm and thickness of 5 mm under 50 g of explosive.The plate center strain, deflection and thickness reduction rate were measured.The test results showed that when the first explosion loading happens, the plate’s strain produced due to local cavitation is one time of that due to shock wave loading; after the steel plate is blown and bent, the second loading phenomenon due to the second blast and local cavitation is not obvious; bubble pulsation and bubble jet cause the steel plate to have obvious elastic deformation, its strain value is 10% of that caused by initial shock wave.The data analysis for plate center deflection and thickness reduction rate showed that the steel plate’s thickness reduction rate increases linearly with increase in center deflection; the study results provide a certain test support for evaluating warships’ sustained combat ability and vitality.

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multiple underwater explosions / circular plate / local cavitation / strain / center deflection

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LI Xudong1,2, YIN Jianping1, DU Zhipeng2, ZHAO Pengduo2, ZHANG Chunhui2, LI YING2,3, ZHANG Fei1,2. Growth law analysis for strain and deflection of steel circular plates subjected to multiple underwater explosions[J]. Journal of Vibration and Shock, 2020, 39(5): 131-136

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