泡沫混凝土中爆炸波传播的非尺寸分析:避免应力增强的最小厚度

IF 5.1 2区 工程技术 Q1 Engineering Defence Technology Pub Date : 2023-12-22 DOI:10.1016/j.dt.2023.12.005
Ya Yang, Xiangzhen Kong, Qin Fang
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引用次数: 0

摘要

泡沫混凝土具有较长的高原阶段,因此具有较高的能量吸收能力,是国防工程中保护结构的一种有前途的材料。然而,如果将泡沫混凝土用作牺牲性覆盖物,并将其放置在爆炸荷载进入的路径上,则可能会出现应力增强而非应力减缓的情况。为了研究这一有趣的现象,首先提出了泡沫混凝土中爆炸波传播的一维差分模型,并通过改进二阶戈杜诺夫方法进行数值求解。差分模型和数值算法与包括应力减缓和应力增强在内的实验结果进行了验证。然后,利用差分模型对爆炸波传播和材料变形进行数值分析,其中考虑了爆炸荷载、应力应变关系和泡沫混凝土长度的影响。特别是提出了泡沫混凝土最小厚度的概念,以避免应力增强。最后,对最小厚度进行了非尺寸分析,并通过对数值数据进行曲线拟合,提出了经验公式,为泡沫混凝土在国防工程中的应用提供了参考。
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Non-dimensional analysis on blast wave propagation in foam concrete: Minimum thickness to avoid stress enhancement

Foam concrete is a prospective material in defense engineering to protect structures due to its high energy absorption capability resulted from the long plateau stage. However, stress enhancement rather than stress mitigation may happen when foam concrete is used as sacrificial claddings placed in the path of an incoming blast load. To investigate this interesting phenomenon, a one-dimensional difference model for blast wave propagation in foam concrete is firstly proposed and numerically solved by improving the second-order Godunov method. The difference model and numerical algorithm are validated against experimental results including both the stress mitigation and the stress enhancement. The difference model is then used to numerically analyze the blast wave propagation and deformation of material in which the effects of blast loads, stress–strain relation and length of foam concrete are considered. In particular, the concept of minimum thickness of foam concrete to avoid stress enhancement is proposed. Finally, non-dimensional analysis on the minimum thickness is conducted and an empirical formula is proposed by curve-fitting the numerical data, which can provide a reference for the application of foam concrete in defense engineering.

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来源期刊
Defence Technology
Defence Technology Engineering-Computational Mechanics
CiteScore
7.50
自引率
7.80%
发文量
1248
审稿时长
22 weeks
期刊介绍: Defence Technology, sponsored by China Ordnance Society, is published quarterly and aims to become one of the well-known comprehensive journals in the world, which reports on the breakthroughs in defence technology by building up an international academic exchange platform for the defence technology related research. It publishes original research papers having direct bearing on defence, with a balanced coverage on analytical, experimental, numerical simulation and applied investigations. It covers various disciplines of science, technology and engineering.
期刊最新文献
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