An experimental study on dynamic response of cylindrical shell under near-field/contact underwater explosion

被引：0
|
作者：
Xu W. [1 ]
Zhao H. [1 ]
Li Y. [1 ]
Huang Y. [1 ]
Fu H. [1 ]
机构：
[1] Institute of Fluid Physics, China Academy of Engineering Physics, Sichuan, Mianyang
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2023年 / 43卷 / 09期
关键词：
contact explosion; cylindrical shell; damage mode; explosion bubble; high speed fragment; near-field explosion; shock wave; underwater explosion;
D O I：
10.11883/bzycj-2023-0072
中图分类号：
学科分类号：
摘要：
In order to deepen the understanding of the dynamic response of cylindrical shell under near-field/contact underwater explosion, small-scale model of cylindrical shell was designed and then optical and electronical tests were conducted to investigate the dynamic response of the model. The physical images of the interaction of shock wave/bubble with cylindrical shell were obtained using a camera with high frequency and high resolution. At the same time, dynamic strain, overpressure and damage mode were obtained. By analyzing the damage morphology of 3D laser scanning and high-speed optical physical images, the physical process of the interaction between shock waves, bubbles, and cylindrical shell structures as well as final damage mode are presented. Through the analysis of dynamic strains, the transformation of tension and compression strains and the division of response stages of the explosion-facing surface and back surface of cylindrical shell structure during loading are revealed. Through the analysis of overpressure loads, the completeness of charge detonation and the influence of structural energy absorption on overpressure under contact explosion loading are clarified. Research results have shown that changes in detonation distance can significantly affect the damage morphology of cylindrical shell structures. Under close range loading, cylindrical shell structures mainly exhibit large plastic deformation, while under contact loading, cylindrical shell structures mainly exhibit tearing failure. The formation and collapse of the cavitation zone on the explosion facing surface of cylindrical shell structures under close range loading cannot be ignored, and the damage effect caused by secondary loading should be further studied. The research results can provide a reference basis for the damage assessment of cylindrical shell structures under near-field/contact underwater explosion. © 2023 Explosion and Shock Waves. All rights reserved.
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