加筋板架抗动能穿甲的等效防护厚度研究

为研究舰船舷侧结构抗穿甲性能,采用有限元分析了两种典型工况下板架的穿甲破坏模式、弹体的剩余速度和板架的变形吸能规律,提出了基于剪切冲塞模式的剩余速度理论计算模型,比较了不同等效计算方法得到的结果,并将理论计算结果分别与相关文献的实验结果和本文的有限元计算结果进行了比较,两者之间均吻合较好。结果表明,加强筋对板架的抗穿甲性能影响较大,而板架的实际等效厚度是决定其抗穿甲性能的主要因素;不同的等效计算方法与模型相对尺寸、弹体冲击速度以及命中位置有关,对于弹体直径相对较大且初始冲击速度较高时,不同的等效计算方法得到的结果基本一致。

Equivalent protection thickness of stiffened plate against kinetic piercing

The analysis of impact numerical was conducted by using finite element method (FEM) in order to research the perforation resistibility of the side structure of vessels. The failure mode, resi-dual velocity of projectile and deformation energy of the stiffened plate for two typical cases were analyzed. Based on the shearing-plugging failure, a theoretical model of residual velocity was proposed. The results of different equivalence methods were compared. The results obtained from theoretical calculations were compared with those from experiments of correlative literatures and finite element simulations respectively. Good coincidence was found between the two results. The results show that stiffeners have great influence on the perforation resistibility of stiffened plates, which is primarily influenced by the equivalent thickness. The different equivalence methods are correlated with comparative dimension of models, impact velocity of projectiles and the hitting position. The results of different equivalent methods are consistent, when the diameter of the projectile is relatively larger and the impact velocity is comparatively higher.