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The effect of bubble jetting from an underwater explosion can result in significant late-time loading compared to the initial shock loading.However,much more attention has been paid to understand the shock wave load and its damage mechanism instead of the complicated loads induced by the bubble dynamics.The loading experienced by a submerged structure in close-proximity to an underwater explosion is investigated with an experimental and numerical study.Laboratory-scale experiments in which small scale charges were detonated in close proximity to an air-backed steel plate are conducted.To recording the loading,the flat plate target is instrumented with strain gauge.Also,High speed camera is used to track the dynamics of the gas bubble as it interacted with and loaded the target structure.The Arbitrary Lagrangian–Eulerian(ALE)method using LS-DYNA software is applied to simulate the entire process of close-proximity underwater explosion.Comparisons with the experimental tests are conducted to verify the results of numerical solutions.Some preliminary results detailing the complex loading phenomena at play,including the bubble pulse,pressure wave and bubble jetting,are presented in this study.Especially,the bubble jetting formation,and the strain response induced by the shock wave and the reloading of bubble jetting.