超压
脉冲(物理)
爆炸物
材料科学
机械
结构工程
射弹
冲击波
嵌入
流离失所(心理学)
动载荷
脉冲响应
有限元法
休克(循环)
复合材料
物理
数学
数学分析
工程类
经典力学
计算机科学
热力学
内科学
医学
人工智能
有机化学
化学
冶金
心理治疗师
心理学
作者
Zizhen Qi,Yuwu Zhang,Yuliang Lin,Fangyun Lu,Rong Chen
标识
DOI:10.1016/j.ijimpeng.2022.104290
摘要
• The dynamic embedding behaviors of the thin-wall expansion tubes considering the effect of shock wave property, scaled distance and explosive equivalent were studied. • The characteristics of blast wave with a quasi-triangular stress-time curve in terms of scaled distance as well as explosive equivalent has a significant influence on the embedding response of the expansion tube. • There exists a negative correlation between the effective impulse and the stress threshold of the expansion tube. • The embedding displacement is affected by the overpressure and impulse simultaneously. Expansion tubes have been considered to be promising impact-resistant structures due to their lightweight and high specific energy absorption capacity. The mechanical behaviors of expansion tubes subjected to a quasi-static loading or a dynamic loading have been widely studied; however, no previous study was reported regarding a blast loading. In this paper, the dynamic embedding responses of expansion tubes considering the effects of shock wave properties, structural parameters, and scaled distance were first investigated through orchestrated explosion experiments. The explosion results show that the embedding displacement is affected by the overpressure and impulse simultaneously. A finite element method was then proposed and verified by comparing the numerical solutions with the experimental results, based on which the effects of loading condition, scaled distance, and semi-angle of expansion tube were revealed. Finally, metallic foam impact tests were conducted to reveal the effect of the shell on the embedding displacement. The numerical solutions indicate that the expansion force increases by 22.9% when the quasi-static loading is replaced with a blast loading. The expansion tube can efficiently reduce the maximum shock stress acting on the baseboard and prolong the buffering process in the time domain. Due to the effect of the blast wave with a quasi-triangular stress-time curve, there exists a negative correlation between the effective impulse and the stress threshold of the expansion tube. In addition, the shell shows an insignificant effect on the embedding displacement of expansion tube. The results in this paper provide useful guidance for the application of expansion tubes in practice for improving the blast-resistant of a structure.
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