Study On The Inertial Trigger Mechanism Of The Armor-piercing High-explosive Projectile Fuze

The inertia trigger mechanism has the characteristics of good reliability,good anti jamming ability,and can be used to play a very good damage performance of a armor-piercing high-explosive projectile.Based on the analysis of requirements of the firing mechanism,the factors affecting the structure of the firing mechanism,the target characteristics and the environmental force of the armor-piercing high-explosive projectile,the layout of the inertial trigger mechanism was given,and its structure and function were described.The safety of the inertial trigger mechanism has an important influence on the ballistic safety of the armor-piercing high-explosive projectile fuze,it is closely related to the creep force of the active strike mechanism in the inertial firing mechanism of the armor-piercing high-explosive projectile in the outer ballistic flight.FLUENT software was used to analyze the flow field of the armor-piercing high-explosive projectile in the different Maher numbers and different angles of attack.The drag force,lift force and turning torque of a bomb in the ballistic trajectory were obtained.The stress conditions in the process of the projectile flight were combined,and the ADAMS software was used to simulate the ballistic trajectory of the armor-piercing high-explosive projectile with different fire angles,the ballistic curve,the falling angle,the falling velocity and the creeping force of the living hammer in the inertial firing mechanism under the different fire angles were obtained.The simulation results showed that the maximum creep force of the living hammer in the inertial firing mechanism was less than that of the supporting force,which can guarantee the ballistic safety.The dropping speed and angle of the armor-piercing high-explosive projectile is obtained,which provided a basis for the simulation of the initial conditions of the armor-piercing high-explosive projectile penetrating target and studing on the ignition performance of fuze inertia trigger mechanism.The ignition performance of the fuze inertia trigger mechanism determines the damage effect to the target of the armor-piercing high-explosive projectile.ANSYS/LS-DYNA software was used to simulate the armor-piercing high-explosive projectile penetrating steel target,concrete target soil and and into the water and and other different state with different velocity and angles of entry,the time,speed and energy of the firing pin stab cap were obtained,and the firing performance of the inertial trigger mechanism was analyzed,and the variation of the active hammer relative to the hammer velocity was studied.The results showed that the penetration of a bomb into the target,the concrete target,the soil and into the water,the fuze inertia trigger mechanism can be reliable ignition,The time,velocity and energy of the firing pin stab cap were affected by target plate material,the velocity of a bomb and the angle of entry.Target plate material,projectile velocity and angle of entry are different,and The degree of fluctuation of active hammer relative to the velocity of the firing pin was also different.