基于耦合算法的三维复杂结构冲击动力学特性

光滑粒子流体动力学-有限元耦合算法（SPH-FEM）较好地结合了SPH和FEM的优势，近年来逐渐被引入冲击动力学相关问题研究中。然而早期的研究对象多为单一材料的简单结构，所取得的研究成果距离实际工程应用仍有一定差距。为此，在总结前人工作的基础上，对SPH-FEM耦合算法进行适当改进，通过引入复合材料损伤模型，对复合材料蒙皮结构飞行器舱段结构进行建模计算，分析其在爆炸冲击激励下的冲击动力学特性。将数值计算结果与试验结果进行对比分析，验证该算法和模型的有效性和准确性，初步实现SPH-FEM的工程实际应用。最后总结了复合材料蒙皮结构飞行器在爆炸冲击激励下的一系列结构动态响应规律，以期为航天飞行器结构设计与防护提供参考。

Dynamic characteristics of three-dimensional complex structure based on coupling algorithm

The coupled smoothed particle hydrodynamics-finite element method (SPH-FEM) has been gradually introduced in some researches about the impact dynamics due to its combined advantages of the two algorithms, but the early research focused mostly on simple structures of single material and the results obtained were not applicable in actual engineering. Based on the work previously done, we developed a coupled SPH-FEM method using a damage model of the composite, built a three-dimensional numerical model for the composite skin aircraft structure and studied its impact dynamic characteristics under explosion loading. The comparison of the numerical with experimental results verified the model and algorithm both as valid and accurate, thereby realizing the actual engineering application of the coupled SPH-FEM method. Furthermore, we also analyzed and summarized the dynamic response mechanism of the composite skin aircraft structure under shock loading. Our study can serve as references for the structural design and protection of the aerospace craft.