Experimental and numerical studies on the dynamic response of steel plates subjected to confined blast loading
Experimental and numerical studies on the dynamic response of steel plates subjected to confined blast loading
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DOI：
10.1016/j.ijimpeng.2017.11.013
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发表时间：
2018-03
影响因子：
5.1
通讯作者：
Cheng Zheng;X. Kong;Weiguo Wu;Shuang-xi Xu;Z. Guan
中科院分区：
文献类型：
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作者：
Cheng Zheng;X. Kong;Weiguo Wu;Shuang-xi Xu;Z. Guan
本文介绍了有限爆炸荷载作用下未加筋和加筋钢板响应的试验和数值研究结果。在一个特殊设计的爆炸室中，对不同加劲肋配置的方形低碳钢板进行了圆柱形TNT装药加载试验。记录了试件的永久变形曲线。一般来说，板表现出大的非弹性整体变形，最大挠度发生在板的中心。通过与相同装药量的自由空气冲击波的冲量比较，发现在受限爆炸条件下，由于爆炸室的约束作用，作用在平板上的等效冲量可提高4.03-5.63倍。此外，利用ANSYS/AUTODYN进行了数值模拟，以进一步了解板的变形模式。关于中点挠度和变形轮廓，获得了非常好的相关性。利用验证后的数值模型进一步研究了加筋板和开孔对加筋板和非加筋板在爆炸载荷作用下变形模式的影响。数值模拟结果表明，随着加劲肋与钢板质量比的增大，最大塑性变形大大减小。结果发现，加劲肋的位置（一侧或相反侧的加载）有一个有限的爆炸载荷下的加筋板的变形模式的影响不大。数值结果还清楚地表明，通风孔可以减少的限制程度的爆炸室，以及施加到板在限制爆炸情况下，这导致在结构变形的减少。
This paper presents the results of experimental and numerical investigations into the response of unstiffened and stiffened steel plates under confined blast loading. Experimental tests were carried out on square mild steel plates with different stiffener configurations under the loading produced by cylindrical TNT charge explored in a specially designed blast chamber. The permanent deformation profiles of specimens were recorded. In general, the plates show large inelastic global deformations with the maximum deflection occurring at the center of the plate. Through the comparison to the impulse in a free air blast with the same charge, the equivalent impulse applied to the plate could increase by up to 4.03–5.63 times in the confined blast cases due to the confinement effect of blast chamber. Besides, numerical simulations are conducted to gain further insight into the deformation modes of plates using ANSYS/AUTODYN. Very good correlation is obtained with regards to midpoint deflections and deformation profiles. The validated numerical models were further used to investigate the influence of the stiffener and vents on deformation modes of stiffened and unstiffened plates under confined blast loading. The results from numerical simulations demonstrate that the maximum plastic deformation decreases greatly with increasing the mass ratio of the stiffener to the steel plate. It was found that the stiffener location (on the side or opposite side of loading) has an insignificant influence on the deformation modes of the stiffened plates under confined blast loading. The numerical results also clearly show that the vents can reduce the degree of confinement of the blast chamber as well as the impulse applied to the plates in the confined blast cases, which results in the decrease of structural deformation.