舰船新型冲击防护层的水下爆炸特性研究

利用结构变形的吸能原理和阻抗不匹配材料界面反射冲击波特性,设计了一种新型的冲击能吸收和防护结构,用来提高舰船的抗水下爆炸生命力.这种冲击防护层可以粘贴在舰船壳体的外表面.文中使用试验和数值计算的方法检验此冲击防护层的抗冲击特性.采用水下爆炸试验的方法得到舰船模型粘贴冲击防护层前后的加速度和应变,并通过试验确定数值计算的冲击波载荷.利用ABAQUS显示动力学模块分别建立与试验对应的数值模型,计算得到相应的动态响应值.试验和数值计算的结果表明冲击防护层具有显著的冲击隔离特性,同时数值计算与试验结果具有较好的一致性.

Characteristic of New Type Shock Protective Layer Subjected to Underwater Explosion

In order to improve the survivability of warship to underwater explosion (UNDEX), a new type rubber shock absorption and isolation structure is proposed in this paper.The structure uses the principle of energy absorption with structure deformation and shock wave reflection between the interfaces of materials with great impedance mismatch. The shock protective layer (SPL) can be stuck to the outer hull of the ship.Both of experimental and numerical methods are used to study the shock protection ability and dynamic response of ship model with the protective layer.The ship model under the same experimental condition was numerically analyzed using the finite element (FE) software ABAQUS explicit dynamic package. Theoretical charge parameter was determined by experimental results. The influence of outer SPL on stress of inner steel layer is studied, too. Rubber is regarded as linear elastic material and the pressure in water is obtained analytically.The stress,acceleration and velocity historise of ship model obtained from experiments and numerical analysis were compared. The experimental and numerical results correlate well with each other.