重复碰撞载荷下加筋板结构的动态响应研究

目的 探究船体加筋板结构在受到重复碰撞载荷作用下塑性变形的累计趋势，分析加筋板主要参数对损伤演化过程的影响，揭示高速、重复冲击下船体加筋结构的变化机理。方法 以一纵三肋加筋板为研究对象，建立基于能量法的刚塑性加筋板动态变形计算方法，以及基于Johnson-Cook本构关系的数值模拟方法，开展不同板架厚度、冲击能量以及冲击尺寸等参数对加筋板变形演化影响的研究。结果 对比分析了理论模型和数值方法，获得了不同参数下的加筋板的结构损伤演化规律。结论 理论解和数值解较为吻合。冲击能量增加后，加筋板的塑性变形量、塑性变形累积速度也随之增加。载荷集中程度越大，对于碰撞边界的破坏效应越大。

Dynamic Response of Stiffened Plate Structures under Repeated Collision Loads

The work aims to investigate the cumulative trend of plastic deformation of the stiffened plate structure under repeated impact loads, analyze the effect of the main parameters of the stiffened plate on the damage evolution process, and reveal the change mechanism of the stiffened structure under high-speed and repeated impact. The dynamic deformation calculation method of the stiff-plastic stiffened plate based on energy method and the numerical simulation method based on Johnson-Cook constitutive relation were established to study the effect of different plate thickness, impact energy and impact size on the deformation evolution of the stiffened plate. The theoretical model and the numerical method were compared and analyzed, and the structural damage evolution rules of the stiffened plate under different parameters were obtained. The theoretical solutions are in good agreement with the numerical solutions. With the increase of impact energy, the amount of plastic deformation and the accumulation rate of plastic deformation of the stiffened plate also increase. The greater the degree of load concentration, the greater the damage effect to the collision boundary.