Performance of flat-plate aluminum structures subjected to in-contact underwater explosions

IF 3.4 2区 工程技术 Q1 ENGINEERING, MECHANICAL Journal of Fluids and Structures Pub Date : 2024-02-08 DOI:10.1016/j.jfluidstructs.2024.104084
Bastian Madsen, Gregory Morgan, Carl-Ernst Rousseau, Arun Shukla
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Abstract

This work investigates the effects of in-contact Underwater Explosion (UNDEX) on flat plates of various thicknesses. The interaction between generated bubbles and the plates is also studied. High-speed photography paired with digital image correlation (DIC) was used to capture full-field displacements, velocities, and strains on the plates during loading. Shockwave pressure was also recorded using pressure transducers strategically positioned in the water. The results show that, in the absence of rupture, thicker plates experience less deformation and allow the bubble to grow to a larger volume than the thinner plates, albeit smaller than that of a free field bubble. Bubbles generated in the vicinity of thicker plates also retain more energy. Contrary to cases of free field or near explosions which feature spherical and drifting bubbles, here the bubble assumes an ellipsoidal shape and attaches itself to the plate where it is confined to a more rapid cycle of collapse and regrowth before fully dissipating. When plate rupture does occur, it is immediate and is due to the initial shock. This structural failure drastically alters the behavior of the bubble.

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平板铝结构在接触式水下爆炸中的性能
这项研究探讨了接触式水下爆炸(UNDEX)对不同厚度平板的影响。同时还研究了产生的气泡与平板之间的相互作用。在加载过程中,使用高速摄影和数字图像相关技术(DIC)捕捉平板上的全场位移、速度和应变。此外,还使用战略性地放置在水中的压力传感器记录了冲击波压力。结果表明,在没有破裂的情况下,厚板的变形较小,允许气泡增长到比薄板更大的体积,尽管小于自由场气泡的体积。在较厚板附近产生的气泡也保留了更多的能量。与以球形和漂移气泡为特征的自由场或近距离爆炸的情况相反,这里的气泡呈椭圆形,并附着在板上,在完全消散之前,它被限制在一个更快的坍塌和再生循环中。当板块发生破裂时,它是立即发生的,是由初始冲击造成的。这种结构性破坏极大地改变了气泡的行为。
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来源期刊
Journal of Fluids and Structures
Journal of Fluids and Structures 工程技术-工程:机械
CiteScore
6.90
自引率
8.30%
发文量
173
审稿时长
65 days
期刊介绍: The Journal of Fluids and Structures serves as a focal point and a forum for the exchange of ideas, for the many kinds of specialists and practitioners concerned with fluid–structure interactions and the dynamics of systems related thereto, in any field. One of its aims is to foster the cross–fertilization of ideas, methods and techniques in the various disciplines involved. The journal publishes papers that present original and significant contributions on all aspects of the mechanical interactions between fluids and solids, regardless of scale.
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