Response Of Model Structure To The Proximity Of
An Underwater Explosion
Author(s)
Y. Kato, K. Murata & K. Takahashi
Abstract
The importance of underwater explosion tests is increasing to assess the
vulnerability of ships and underwater structures against 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 near-field underwater explosion tests were performed to
investigate the response of a model target during underwater shock and bubble
pulse loading. The relation between deformation of a model target and the effect
of explosive composition was obtained.
1 Introduction
During the last decades, the underwater explosion tests have contributed
extensively to understand the detonation effects of explosives in terms of their
measured underwater shock wave and bubble effects. The underwater shock
wave and bubble period have been widely measured to determine the underwater
explosion performance of various explosives [1, 2]. Much attention has been
paid to the underwater shock wave, and only limited data exists for bubble pulse.
In our recent works, we measured precisely bubble pulse profile by pressure
gauge using fluoropolymer as sensing element [3, 4]. The experimental results
showed that the impulse of bubble pulse is about 1.5-2.5 greater than that of the
underwater shock wave, although peak bubble pulse pressure is only 15-30% of
peak shock wave pressure. Consequently, bubble pulse was shown to present
important dynamic loading against the underwater targets.
In recent years, the importance of the underwater explosion tests is increasing
to assess the vulnerability of ships and underwater structures against the
Keywords
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