To solve the problems as early explosion of mechanical trigger fuze of medium and large caliber gun-howitzer,unclear response characteristics and failure mechanism of fuze and typical structure under high dynam-ic and complex mechanical environment of interior trajectory,a rifled gun barrel-projectile-fuze coupling simula-tion models in the interior ballistic environment was established,considering the limit boundary conditions as moderate wear of gun barrel,charge No.0 of bleed base projectile,maximum loading angle of projectile,and limit deviation between projectile and fuze.The response characteristics of the typical elastic-ejector mechanism were analyzed,adopting finite element methods of fusion SPH and Lagrange.The prediction error of the simula-tion model was verified by test data of the typical working conditions of hollow base projectile and bleed base projectile.The results showed that the limit boundary conditions significant affected the time domain distribution characteristics of thrust resistance,impact force between projectile front center and rifled gun barrel,motion at-titude,and overload response of fuze and its typical mechanism.Compared with the conventional conditions of hollow base projectile and bleed base projectile,the impact forces between projectile and barrel increased 63.75 times and 29.82 times respectively.The pitch angle of the projectile increased 8.69 times and 6.71 times respec-tively.The yaw angle increased 3.89 times and 1.75 times respectively.Interior ballistic peak axial overload of the fuze rotating body increased by 19.49%and 5.44%respectively.The radial peak overload increased by 78.7%and 1.44 times respectively.Under the limit boundary conditions,the risk of strength failure of the fuze in interior ballistics increases obviously,the initial nutation angle of the projectile when being out of muzzle increased obviously,and the risk of abnormal action in exterior ballistics also increased.The relevant research was of great signif-icance for exploring the failure mechanism of medium and large caliber gun-howitzer mechanical trigger fuze in complex dynamic mechanical environment and guiding the optimization design of fuze reinforcement.
medium and large caliber gun-howitzerbleed base projectilemechanical trigger fuzelaunching environmentallimit boundary conditionscharacteristics of coupling models
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