基于薄层单元模型的弹体与引信系统螺纹连接参数确定方法

Threaded connection is one of the main connection modes of projectile body and fuze body, which affects the vibration response characteristics of projectile-fuze system directly. For the problem that the existing numerical simulation methods are difficult to characterize the threaded connection accurately, a thin-layer element method is peoposed to simulate the threaded connection, and a determination method for the material parameters of thin-layer element is established through theoretical and experimental research. The material parameters of thin-layer element are determined based on the elastic model of threaded connection and thin-layer element theory.The determined material parameters of thin-layer element are applied to the finite element model. The calculation accuracy of thin-layer element model is verified by the modal test of threaded tube and projectile-fuze system. Compared with the modal test results of threaded pipes with different pitch and thread length, the maximum calculated error of the thin-layer element model is 5.11%. Moreover, compared with the nodes fusion method, the maximum error of the first third-order modal frequency decreases from 17.72% to 2.54% after using thin-layer element method for the projectile-fuze system.