基于薄层单元法的弹体与引信系统螺纹连接模拟参数识别

Thread connection is one of the main forms of connection between penetrating projectile and fuze body. To address the problem that thread connection can not be represented accurately by way of the existing dynamic numerical analysis, a method of simulating the thread connection using thin-layer elements is proposed, and a method for identifying the material parameters of thin-layer element based on test results is established. Modal test of pipe threads was carried out. The influences of the amplitude of excitation force and the loose and tight connection of threads on the modal frequency and frequency response curve are discussed, and the thin-layer element method is used for the simulation calculation of pipe threads. Results show that the state of loose thread connection is much more affected by non-linear factors compeared with tight connection; the magnitude of excitation force exerts greater influence on the measured result of loosely connected threads; the maximum error of modal frequency is reduced from 26.66% to 1.35% by comparing the simulated results of thin-layer element with the fixed nodes.