Abstract
This work compares experimental and numerical results concerning the elastic dynamic response of air-backed plate to underwater explosion. Experiments were performed in a centrifuge, both the shock loadings and structure responses were tested, and the bubble oscillation considering centrifugal force was predicted with Geer and Hunter model. The experimental and numerical results illustrates that the centrifugal force have no effect on shockwave for the short duration of action, and with the increase of centrifugal force, the bubble pulse motion cycle, maximum bubble radius, and peak pressure of bubble pulse decreased; both the peak of high-frequency and low-frequency response of the plate decline slightly when alpha damping rising ,the high-frequency response mode almost have no change with different alpha damping ,while, the low-frequency response tends to be an obvious oscillation waveform when the alpha damping is too low; although the difference of the peak acceleration owing to shock wave and bubble reaches to tens of times, the strain responses caused by the two factors are very close, which enucleates that the train response is related to shock energy and has a higher sensitivity to time accumulation; both the peak acceleration and peak strain due to the shock wave remain steady and the two kinds of response by bubble pulse decrease with the centrifugal force increasing; when the target position is more close to the area that the shock wave vertically impact ,the linear correlation between peak velocity and shock factor is much better. Key words: underwater explosion; centrifugal effect; FEM.
Highlights
Understanding and prediction of the dynamic response of submerged structure subjected to underwater explosion (UNDEX) is an important step for naval ship designers
The UNEDX experiments were carried out in a centrifuge to expound the dynamic response of an air-backed steel plate impacted by shock loadings
The bubble oscillation considering centrifugal effect were predicted with Geer and Hunter model, and the experimental response were compared with Finite element analysis under the same plate and shock loadings
Summary
Understanding and prediction of the dynamic response of submerged structure subjected to underwater explosion (UNDEX) is an important step for naval ship designers. CENTRIFUGE EXPERIMENT AND NUMERICAL STUDY ON THE DYNAMIC RESPONSE OF AIR-BACKED PLATE TO UNDERWATER EXPLOSION. Liu [10] carried out centrifuge experiment on the thin-walled aluminum tubes to investigate the response of transit tunnels in saturated soils under internal blast loading; De [11] simulated the effects of surface explosion on the underground tunnel with the centrifuge and gave potential mitigation measures through numerical analysis; De [12] used centrifuge to build the physical model to study the effect of an underwater explosion on a buried tunnel and found that the strains in the tunnel increased with water level above the ground surfaces and remained constant at a certain point ,which was related to the mass of explosives. UNDEX experimental studies carried out on an air-backed rectangular steel plate with different charge weights, standoff distances and centrifugal forces were presented. The numerical analysis of the plate was performed with ABAQUS finite element(FE) code and the results are compared with the experimental data from reference [18] and [19]
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