Abstract

Experiments on shock focusing in water-filled convergent structures have been performed. A shock wave in water is generated by means of a projectile, launched from a gas gun, which impacts a water-filled convergent structure. Two types of structures have been tested; a bulk material and a thin shell structure. The geometric shape of the convergent structures is given by a logarithmic spiral, and this particular shape is chosen because it maximizes the amount of energy reaching the focal region. High-speed schlieren photography is used to visualize the shock dynamics during the focusing event. Results show that the fluid-structure interaction between the thin shell structure and the shock wave in the water is different from that of a bulk structure; multiple reflections of the shock wave inside the thin shell are reflected back into the water, thus creating a wave train, which is not observed for shock focusing in a bulk material.

Highlights

  • Underwater explosions (UNDEX) can cause severe damage to nearby marine structures [1, 2]

  • Previous studies related to fluid-structure interaction and the structural response due to UNDEX has focused on impulsive loading of monolithic plates [3], sandwich beams [4] and composite panels [5]

  • These two factors indicate that underwater shock focusing in convergent structures will have complex dynamics and failure modes which are different from the panels subjected to planar shock loading

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Summary

Introduction

Underwater explosions (UNDEX) can cause severe damage to nearby marine structures [1, 2]. When the shock wave travels into a convergent structure, the interaction time between the shock wave and the structure is in general much longer than that of an instantaneous loading, which suggests that more energy can be transferred into the solid structure. These two factors indicate that underwater shock focusing in convergent structures will have complex dynamics and failure modes which are different from the panels subjected to planar shock loading

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