多次水下爆炸钢制圆板应变与挠度增长规律分析

在海上战争中,水面舰艇以及潜艇可能会受到多枚水中兵器的攻击,产生的累计损伤问题影响着水面舰艇以及潜艇的持续作战能力和生命力。对膨胀直径为390 mm,厚度为5 mm空气背衬钢制圆板,在50 g药量下,进行持续多次水下爆炸加载试验,对板中心应变、挠度以及厚度减薄率进行测量,试验结果分析表明:第一次爆炸加载时,局部空化使钢板产生的应变是冲击波加载的1倍,当钢板被炸弯后,再次爆炸加载局部空化的二次加载现象不明显。此外,气泡脉动及气泡射流会使钢板发生明显的弹性应变,应变值是初始冲击波作用的10%。对中心挠度和厚度减薄率的数据分析发现,钢板厚度减薄率是随着中心挠度呈线性增加的。该研究对舰船持续作战能力及生命力的评估提供了一定的试验支撑。

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

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.