水下爆炸环肋圆筒损伤特性实验及数值模拟

Experimental and Numerical Study of Damage Characteristics for Ring-Stiffened Cylinder Subjected to Underwater Explosion

根据鱼雷舱段壳体的特点提出一种内部带有环肋、两端连接配重的缩比圆筒结构模型,针对模型的损伤特性进行水下爆炸实验,并利用Autodyn软件对实验进行数值模拟计算.结果表明,圆筒在不同爆距下产生塑性变形和破裂的损伤形式;气泡上浮会改变二次压力波的初始方位,造成水平方位圆筒的非对称损伤形态;当爆距较小时,冲击波造成壳体局部凹坑或破裂,而二次压力波则造成迎爆面整体变形.比较数值模拟与实验结果可知,计算模型能够描述冲击波对圆筒的作用特性.

According to the characteristics of the torpedo compartment shell, a model of ringstiffened cylinder with counterweights at each end was designed. The experimental study was carried out on damage characteristics of this model, and numerical simulation of the experiment was carried out with the Autodyn software. The result shows that cylinders have two kinds of damage form in different explosion distance, plastic deformation and structural fracture; the bubble＇s floating changes the initial direction of the second pressure wave and causes the non symmetric failure of cylinder in the horizontal orientation. When the explosion distance is small, the shock wave causes partial concave or fracture, and the second pressure wave cause the whole distortion of shell. By comparing numerical results with experimental results, it is proved that this simulation model can describe the response of cylindrical shells subjected to shock wave.