Growth law analysis for strain and deflection of steel circular plates subjected to multiple underwater explosions
LI Xudong1,2, YIN Jianping1, DU Zhipeng2, ZHAO Pengduo2, ZHANG Chunhui2, LI YING2,3, ZHANG Fei1,2
1.School of Mechatronic Engineering, North University of China, Taiyuan 030051, China;
2.Naval Academy of Armament, Beijing 100161, China;
3.Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China
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.
李旭东1,2，尹建平1，杜志鹏2，赵鹏铎2，张春辉2，李营2,3，张斐1,2. 多次水下爆炸钢制圆板应变与挠度增长规律分析[J]. 振动与冲击, 2020, 39(5): 131-136.
LI Xudong1,2, YIN Jianping1, DU Zhipeng2, ZHAO Pengduo2, ZHANG Chunhui2, LI YING2,3, ZHANG Fei1,2. Growth law analysis for strain and deflection of steel circular plates subjected to multiple underwater explosions. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(5): 131-136.
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