水下爆炸载荷下舰船板架边界撕裂损伤相似准数研究

Research on scaling law of boundary tearing damage of stiffenedplates for ship subjected to underwater explosion load

为研究舰船板架在水下爆炸冲击波载荷作用下的变形及破损,结合现有试验数据,采用仿真和数据拟合的方法,展开了均布载荷下板架边界撕裂损伤的相似准数研究。首先,结合理论和数据分析得出,板架边界撕裂时的初始响应速度与破坏模式密切相关,且可清晰描述板架的不同毁伤模式;进一步通过仿真得出断裂应变、板厚、长宽比是影响板架边界撕裂的重要参量;最后,基于量纲理论建立了用于判定板架边界撕裂毁伤的拟合函数,并根据战场舰船损伤实例验证了该函数的有效性。研究结果表明,基于初始响应速度和考虑断裂应变等参量的无量纲数构建板架边界撕裂毁伤判据的方法是可行的,为舰船板架的毁伤相似研究提供了参考。

In order to analyze the deformation and damage of a stiffened plate for the ship subjected to underwater explosion shock wave load,the scaling law of boundary tearing damage of the plate under uniform load was studied by using simulation and data fitting methods.Firstly,we combined theory and data analysis to find that the initial response velocity is closely related to the failure mode,and can clearly describe the damage mode of the stiffened plate.At the same time,simulation results show that the fracture strain,plate thickness,and length width ratio are the important parameters that affect the boundary tear of the stiffened plate.Finally,a fitting function wasestablished to determine the tearing damage of the stiffened plate,and the effectiveness of the function wasverified by a warship damage case.The results show that the method of constructing the tearing damage criterion of the plate boundary based on the initial response velocity and the dimensionless number considering the parameters such as the fracture strain is feasible,which provides a reference for the scaling research on the damage of the ship’s stiffened plate.