Comprehensive Performance Study Of Trigger Fuzes For Small Caliber Artillery Shells In Service

Small-caliber artillery occupies an important position in military equipment around the world because of its excellent mobility,very high firing speed and high hit rate.The fuze is the most important factor for the munition to work and achieve the terminal destruction effect.Since the mechanical fuze of small-caliber artillery shells is equipped with a huge amount of equipment,producing millions of rounds per year,and the mechanical fuze is still the main equipment,so the mechanical fuze of small-caliber artillery shells has an urgent demand for high safety and reliability,and there is an urgent need to conduct comprehensive performance research on the fuze of small-caliber artillery shells,to clarify the transfer law of high dynamic multi-stress coupling excitation in the interface between the fuze system and the module,to analyze the fuze and the core functional module This thesis presents the kinematic/dynamic response characteristics of small-caliber artillery shells,and provides support for improving the safety and reliability of small-caliber artillery shells.This thesis firstly introduces the construction of the fuze model of the studied small caliber ammunition,the principle of action,establishes the small caliber ammunition fuze simulation model library,and explains the simulation idea of this thesis.Secondly,the response characteristics of 35 mm small-caliber ammunition fuze in the process of ammunition supply and internal ballistics are studied,and LS-DYNA is used to conduct finite element simulation research on the lateral impact of small-caliber ammunition fuze with different velocities.The internal ballistic mathematical model is established,combined with Simulink,the internal ballistic simulation model is solved for the bore environment,and the response characteristics of the fuze of small caliber shells in the bore motion are studied.It is found that the local strength of the fuze safety system of 35 mm small-caliber shells exceeds the yield stress of the aluminum alloy runner,i.e.,local strain occurs in the runner,but it does not affect the safety of the small-caliber shell fuze under high axial overload.Finally,in view of the reliability and safety problems of low firing rate and hidden danger of unexploded shells,the response characteristics of the firing mechanism of small-caliber artillery shell fuzes in service are studied.Based on the numerical simulation method of finite element,the dynamic response process of the firing mechanism of the large hitting angle target was simulated under different working conditions of hitting speed,hitting angle,rolling angle and target plate thickness.With the increase of the rolling angle,the smaller the amplitude of the axial force felt by the firing pin and the more time lagged,which is not conducive to the reliable function of the firing mechanism of the large hitting angle touching target;meanwhile,it is found that with the increase of the angle and the thickness of the target plate,the failure mode of the guide sleeve "stuck" the firing pin appears.