In order to eliminate the damage of large-caliber barrel caused by excessive stress in the engraving process,a nylon-copper composite band was designed,and its dynamic graving process were studied numerically on the behalf of the internal ballistic characteristics of large-caliber gun.Based on the existing copper band,the nylon-copper composite band was designed via injection molding.Though classical interior ballistic model,the bottom pressure of the projectile in the interior ballistic process was derived.Then the bottom pressure was adopted as dynamic condition of the simulation of band engraving.The interior ballistic dynamic parameters with single and composite band was studied.The influence of the thickness of nylon on the characteristic of ballistic was analyzed.The results indicate that under the same conditions,the interior ballistic dynamic parameters of the projectile with nylon band is better than the projectile with copper band,and the stress of nylon band is lower during graving.The internal ballistic parameters are related to the nylon content.With the increasing of nylon thickness,the internal ballistic parameters of projectiles with composite band are enhanced,and the engraving stress decreases.The results can provide reference for the design of large-caliber gun projectile band.
engraving processinterior ballisticscomposite bandthickness of nylon
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