基于ALE算法的船体板架射流载荷下毁伤模式分析

Analysis of Damage Modes of a Ship's Stiffened Plate Subjected to Bubble Jet Loading Based on ALE Method

研究表明,近边界气泡在坍塌阶段产生的高速射流将对船用板架结构造成严重的损伤。本文利用LS-DYNA中的ALE算法对船体板架结构在射流冲击载荷作用下的破坏情况进行了模拟。首先分析简单平板在不同作用位置、速度和形状的射流载荷作用下的动态响应。在此基础上对射流冲击下加筋板结构的毁伤特性进行了研究,重点分析了结构的强弱对板架毁伤模式的影响。计算结果表明:气泡射流载荷对于船体结构的破坏具有明显的局部效应,其破坏程度非常严重,射流对加筋板的毁伤效果因冲击位置不同而有所区别。因此,在舰船结构抗爆抗冲击性能研究中,气泡载荷不容忽视。

Recent studies have shown that bubble collapse near a boundary would generate high- speed jet which could cause severe damage of ship structures. In this paper, the ALE method in LS-DYNA was adopted to simulate the damage effect of a ship＇s stiffened plate structure subjected to jet impinging. Plane plate＇s dynamical responses under different impinging location, velocity and configuration of the jet loading were analyzed. On this basis, damage modes of the stiffened plate impacted by the bubble jet in solid and vulnerable regions were discussed. The result shows that the bubble jet loading can cause serious damage of the structure and have obvious local effect of damage. The damage modes of ship＇s structure vary with impinging location change of the bubble jet. Through the analysis of explosion and shock resistance, it can be concluded that the effect of underwater bubble explosion cannot be neglected.