Prediction of clearing effects in far-field blast loading of finite targets
Prediction of clearing effects in far-field blast loading of finite targets
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DOI：
10.1007/s00193-011-0308-0
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发表时间：
2011-04-01
期刊：
影响因子：
2.2
通讯作者：
Fay, S.
中科院分区：
文献类型：
--
作者：
Tyas, A.;Warren, J. A.;Fay, S.
众所周知，当冲击波击中目标表面时，加载的持续时间以及给予目标的总脉冲可能会受到稀疏波的传播的影响，即沿目标的加载面上邻近自由边缘的“清除”波的传播。多年来，人们已经有了简单的方法来预测清理对减少爆炸载荷冲量的效果，但最近的研究质疑了这些方法的准确性和物理基础。因此，一些作者使用数值模拟和/或实验技术来确定清除效果的经验预测方法。事实上，这个问题在50多年前的一项研究中就已经解决了，而这项研究似乎后来被BLAST研究兄弟会忽视了。本文介绍了早期研究的结果，并提供了实验验证。分析预测很容易确定，并且与实验结果很好地吻合。
It is well known that when a blastwave strikes the face of a target, the duration of the loading, and hence the total impulse imparted to the target may be influenced by the propagation of a rarefaction, or "clearing" wave along the loaded face of the target adjacent to free edges. Simple methods of predicting the effect of clearing on reducing the blast loading impulse have been available for many years, but recent studies have questioned the accuracy and physical basis of these approaches. Consequently, several authors have used numerical modelling and/or experimental techniques to determine empirical predictive methods for the clearing effect. In fact, the problem had been addressed more than 50 years ago in a study which appears to have been since overlooked by the blast research fraternity. This article presents the results of that earlier study, and provides experimental validation. The analytical predictions are very simple to determine, and are shown to be in excellent agreement with experimental results.