舰船船底破损后的外载荷和应力研究

以某舰船为例,用符拉索夫法计算了鱼雷在舰船底部非接触爆炸使舰体结构产生破损后由于进水引起的浮态和载荷变化,给出了鱼雷命中破损后波浪弯矩随不同破损部位、不同进水体积的变化规律。在此基础上计算了鱼雷爆炸使舰体结构产生破损后的应力。研究指出,计算破损舰船结构应力时必须同时考虑破损使结构承载力大大下降和由于进水引起的浮态和载荷变化对舰艇生命力的影响。舰体结构的正应力和剪应力都随着进水体积的增大而增大,鱼雷最危险的命中位置是船中和剪力最大处。研究对舰船生命力的评估有重要意义。

The study of the wave load and stresses of warship damaged on the bottom

In this paper the floating parameters and wave load of a warship whose bottom is damaged by a non-contact exploding torpedo is studied using Vlasov's method,the rules of bending moment varied by different damage position and different number of flooded holds caused by explosion are given.The normal and shearing stresses in damaged hull structure are calculated.The results show that the damage of hull structure cause the variety of the floating parameters and wave load,the lose of section modulus and the unsymmetry of section,both of them should be considered when the stresses of hull structure are calculated,they all have bad effect on the vitality of damaged warship.Normal and shearing stresses increase with the increase of the number of flooded holds,and the most dangerous damage position is the midship and the section where shearing force is biggest.The study is important for the vitality evaluation of warship.