内部爆炸作用下钢箱结构变形规律性实验

箱型结构内部爆炸能够造成比空爆更严重的破坏效果。本文中设计了3个边长600 mm、板厚4 mm的实验试件，并分别用98.4、194.7和355.8 g的TNT炸药进行了内部爆炸实验，得到了所有试件的变形特征。箱体壁板的变形都呈现向外凸出(鼓起)的特点，壁板中心的最终挠度随着爆炸TNT当量的增大而近似成线性增长，拟合了箱体壁板挠厚比与爆炸当量之间的经验公式。通过三维数字图像相关技术，得到了箱体壁板的动态响应过程:爆炸发生后，壁板中心最先产生向外鼓起；壁板中心随后变形增长，同时变形向四周传播；壁板中心变形达到最大值后，板的变形会产生一定量的振荡回缩。

Experimental study of deformation of steel box subjected to internal blast loading

Damage could occur to a more severe degree in an internal blast than in an air blast with respect to box-shaped structures.In the present study,a blast experiment was performed using 98.4,194.7 and 355.8 g TNT explosives,respectively on three box-shaped specimens 600 mm in length and 4 mm in plate-thickness,to obtain their deformation features and observe the outward bulges at the center of their plate wall.It was found that the central deflection of the wall increases with the increase of the TNT mass.An empirical equation is proposed by fitting the linear relationship of the deflection thickness ratio and the TNT mass.The dynamic response of the wall was analyzed using the 3D digital image correlation (DIC) technique.The outward bulge was produced in the wall center after the explosion and at the same time the deflection increased with time passing by and the deformation propagated towards the wall edge all around.After the deflection reached the maximum value,the deformation of the wall experienced several oscillations.