引信系统螺纹连接界面的冲击传递特性模拟方法研究

Large-diameter integral threaded connection is the main installation form of fuze on the penetrator projectile body. The impact transmission characteristics of the threaded interface have important significance for the design of the fuze system. To solve the problems of geometric nonlinearity, complex contact friction state and secondary or multiple collision caused by interface separation in the process of impact transmission at the interface of space thread, a threaded connection specimen was designed and a refined finite element simulation model was established. The validity of the refined finite element model was verified by the impact test data of the large-diameter Hopkinson bar. The impact response of threaded structural parts was calculated by finite element simulation, the overloads of internal and external structures were compared, and the influence of preload on the acceleration response was analyzed through the fine model. Finally, regarding the problem that the simplified model of the existing thin-layer element can only simulate the linear vibration characteristic of the threaded structure well but cannot accurately simulate the shock transfer characteristic of the thread, a simplified model of nonlinear thin-layer elements considering the collision between threads was proposed to enrich the applicable working conditions of the simplified model.