Abstract
Gun barrel bores are prone to ablative damage and stress concentration under high temperatures, pressures, and dynamic load impacts during bullet engraving, which may result in barrel failure. A dynamic stress analysis during bullet engraving is a prerequisite for barrel life analysis and design. Impact responses during bullet engraving were investigated in this study for rifled barrels with different cross-sectional profiles to improve the match between the dynamic performances of the gun barrel and bullet and effectively extend the barrel service life. First, feature suppression by expression based on a uniform parametrized template was used to perform parametric modeling of a gun barrel with rectangular, trapezoidal, multiarc, and multilateral-arc rifling profiles. Second, theoretical models were constructed considering different rifling structures: a model to calculate the chamber pressure, a model for heat transfer in the barrel during continuous firing, and a model to calculate the friction between a bullet and the barrel wall surface based on shear-slip friction theory. These models were integrated into a simulation, where the ABAQUS (ABAQUS. 6.14.1-4. 2014. DASSAULT SIMULIA.)/Explicit software was used to build a finite element model of the barrel dynamic stress under heat-force-friction coupling during bullet engraving. Finally, the dynamic response stresses were analyzed for bullet engraving into four barrels with different rifling profiles. All four types of barrels developed considerable stress at the junction between the forcing cone and the rifled bone under the same impact load. The stress values of the multiarc and multilateral-arc rifling were far below that for the rectangular and trapezoidal rifling. Thus, the barrels with multiarc and multilateral-arc rifling profiles had a higher impact resistance than the other two barrel types.
Highlights
The barrel is an important structural component of firearms, and the strength of the barrel bore affects important tactical indicators, such as the barrel life, shooting accuracy, and muzzle velocity
The barrel bore is affected by the pressure of gunpowder combustion gases, the force exerted by bullet insertion, the guide-side resistance, high temperatures, and other factors, which tend to cause ablative damage and crack propagation in the barrel rifling and barrel failure [1]
Dynamic stress analysis models and methods for barrels with different rifling profiles were applied in this study to bullet engraving into rifling during continuous firing
Summary
The barrel is an important structural component of firearms, and the strength of the barrel bore affects important tactical indicators, such as the barrel life, shooting accuracy, and muzzle velocity. Note that most of these studies were based on rectangular rifling profiles and did not comprehensively consider the effect of heat-force-friction coupling for the bullet/barrel interaction process. The impact response of rifled barrels with different cross-sectional profiles during projectile engraving was investigated in this study. Siemens) software, and efficient three-dimensional models were created for different barrel structures with rectangular, trapezoidal, multiarc, and multilateral-arc rifling. The heat-force-friction coupling effect was comprehensively considered, and the ABAQUS/Explicit software was used to build a finite element analysis model for the dynamic response stress during the engraving of a bullet into a barrel. The values of the respective dimensional expressions were modified based on design requirements to generate threedimensional models of barrels with different structural types and dimensions using the parametrized template. The uniform parametrized template was used to realize parametric modeling of barrels with over a thousand structural types
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