The importance of the underwater explosion tests is increasing to assess the vulnerability of ships and underwater structures against the underwater explosion phenomena. The near-field underwater explosion causes severe fluid-structure interaction on a target; shock wave contact, resulting fluid cavitation formation and closure, and finally bubble expansion and collapse leading possibly to water jet impact. A series of the near-field underwater explosion tests were performed to investigate the response of model target during underwater shock and bubble pulse loading. The relation between deformation of model target and the effect of explosive composition were obtained.
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