To study the mechanical response about rifling's steering side and band in engraving process,the motion,deformation of band and its mechanical mechanism during projectile engraving process were deduced based on the energy method,and the force relation between the rifling's steering side and band after engraving was analyzed according to the classical interior-ballistics theory,and the general expressions of the force on rifling's steering side during engraving process and after engraving were obtained. The influencing factors of the force on rifling's steering side were analyzed. Interior ballistics was simulated by using an elastic-plastic finite-element-method,and dynamic responses of the force on rifling's steering side were obtained under various operating conditions. The force on rifling's steering side,influence law of engraving velocity and angle of forcing cone were analyzed. The researches show that the force on rifling's steering side is positively correlated with engraving velocity and angle of forcing cone,and its trend of change is consistent with the bottom pressure of the projectile after engraving in. Within a certain range of velocity,the peak of the force on rifling's steering side during projectile engraving is much larger than that at the moment of maximum chamber-pressure,and the ratio of them shows a significant increasing trend as the engraving velocity increases. For the cased telescoped ammunition with longer free-travel-distance,the force is more complex in engraving process,so it's necessary to strengthen charge structure and optimize forcing cone to improve the barrel life. The calculation methods and conclusions mentioned can provide theoretical reference for projectile structure design and analysis of projectile-barrel matching.
interior ballisticsforce on rifling's steering sideengraving velocityangle of forcing coneprojectile-barrel matching
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