近场爆炸载荷作用下某大型舰船结构剩余强度分析

Residual strength analysis of vessels under near-field underwater explosion loads

近场水下爆炸载荷作用下舰船结构的毁伤效应及剩余强度问题一直是业内研究的重点内容之一。首先,对典型舰船设置近场水下爆炸工况,并结合通用FEM软件对近场爆炸载荷下的结构响应进行模拟。然后,根据近场爆炸产生的破口和塑性变形,对典型剖面剖面模数的损失进行分析,发现由近场爆炸引起的毁伤会导致剖面出现8%~10%的剖面模数的损失。最后,对破损舰船浮力重新分布后的波浪弯矩和静水弯矩进行计算,并结合军规对舰船在近场水下爆炸载荷作用后破损情况下的剩余强度进行分析。结果显示,在鱼雷的攻击下,该型舰船依然满足剩余强度要求。

The damaging effect and residual strength of ships under the near-field underwater explosionloads has remained as one of the most crucial subject in the field of vessel research. In this paper, the structural response under explosive loads is simulated based on the common FEM software by assuming a typical near-field condition of underwater explosion. Loss of the modulus for typical sections is then analyzedaccording to the crevasse and plastic deformation results of near-field blast, and the loss is within 8% ~10%. The wave bending moment and still water bending moment are also calculated after the buoyancy redistribution. Finally, the residual strength in the damaged cases is analyzed simultaneously for thenear-field underwater explosion combined with military regulations. The results show that the vessel still meet the requirements of residual strength under torpedo attack.