采用数值模拟与实验相结合的方法研究了薄壁方管结构在爆炸荷载作用下的动力响应。将壁厚3mm、截面边长为100mm的薄壁方管结构置于200gTNT产生的爆炸场中进行冲击实验，实验表明当装药距离大于等于14cm时，结构仅呈现局部凹陷变形，当装药距离为10cm和12cm时，结构除局部凹陷变形外，还呈现出整体变形模式，同时，方管迎爆面两侧边产生长条状破裂损伤。利用动力有限元程序LS-DYNA及流固耦合算法对薄壁方管变形及破坏过程进行数值模拟，得到了结构关键单元处压力分布、挠度时间曲线等参数。同时分析了结构宽厚比对试件动力响应的影响，结果表明迎爆面变形量随着宽厚比的减小而减小。
Abstract
Numerical simulation and experimental test were carried out on the dynamic response of thin-walled steel square hollow tubes subjected to explosion loading. Impact experiments of explosion loading caused by 200g TNT charge on the steel square tubes were carried out. The deformation modes and damage modes were obtained under different conditions. The experimental results show that when the charge distance was greater than or equal to 14 cm, the structures underwent local deformation only. When the charge distance was equal to 10cm and 12 cm, the structures underwent local and global deformation. The experimental results also show that the two side walls facing explosion display long strip rupture damage. By using LS-DYNA, the deformation and damage processes of thin-walled tubes subjected to explosion loading were numerically simulated with Lagrangian-Eulerian coupling method. The deformation processes of thin-walled tubes as well as the deflection-time curves of some key points were also obtained. We also analyzed the dynamic response of the square tubes affected by the width to thickness ratio. The results show that the deformation value decreased with the decreasing of the width to thickness ratio.
关键词
薄壁方管 /
爆炸荷载 /
动力响应 /
破坏模式
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Key words
thin-walled square tubes /
blast loading /
dynamic response /
damage modes
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