Study on diffracting and screening effects of cavities on axial stress waves in defense layer

WANG Zhi-liang; LI Yong-chi

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Study on diffracting and screening effects of cavities on axial stress waves in defense layer

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- Study on diffracting and screening effects of cavities on axial stress waves in defense layer
- Vol. 26, Issue 8, (2005)
- 作者机构：
  
  中国科学技术大学力学和机械工程系,合肥,230027
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU454
- Online First：26 December 2013，
  
  Published：2005
- 稿件说明：
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WANG Zhi-liang, LI Yong-chi. Study on diffracting and screening effects of cavities on axial stress waves in defense layer[J]. 2005, 26(8).
DOI：

WANG Zhi-liang, LI Yong-chi. Study on diffracting and screening effects of cavities on axial stress waves in defense layer[J]. 2005, 26(8). DOI：

摘要

随着新型武器的发展，在当今的人防工程中对防护层的功效要求越来越高。以工程抗爆设计为背景，主要研究了如何在防护层中利用空穴来绕射和屏蔽应力波的问题。经过大量计算发现，空穴的几何形状及尺寸效应等对其后方的应力波削减有显著影响。针对常见的方形和圆形空穴，提出了孔穴后方、位于其对称轴上点的轴向应力σy峰值削减因子DF的2个近似拟合式子。可分别用来估算在一定条件下孔穴后方特定位置处的削减因子，或用来计算所需空穴的尺寸，甚至可以推算为了达到某一削减效果而必须满足的最小安全距离等。其结果为在抗爆防震工程中智能的防护层的设计提供了一定理论依据。

Abstract

With the rapid development of new-type weapons

the demand for the efficiency of defense layer becomes higher and higher in current civil protective construction. The focus of this paper is primarily on the attenuating and screening stress-waves by using cavities embedded in defense layer. Based on a great many numerical calculations

it has been found that the weakening amplitude of stress-waves behind certain artificial cavity is clearly different if the size dimension and geometry shape of the cavities are changed. Besides

two approximately fitted formulae for the decay factors of peak σy

towards the circular and rectangular cavity are put forward

which can be used to estimate the value of decay factors (DF) at one specific place or the size dimension of cavities under certain conditions; and even can predict the minimum safe distance in order to reach expected attenuating effect. All those can be referenced for the design of intelligent defense layer in anti-explosion engineering.

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