射击过程中弹壳对枪机作用力的理论分析

THEORETICAL ANALYSIS OF THE FORCE EXERTED ON THE BOLT BY CARTRIDGE CASE WHEN FIRING

Proceeding from the actual load-bearing condition of the bolt when an automatic weapon is firing, formulas for calculating the normal pressure between the cartridge case and the chamber, the vesistance force caused by the axial deformation or shift of the cartridge case, and the interactive force between the cartridge case and the bolt are derived, based on the theory of thin-wall cylindrical shell bearing internal pressure and the assumption of single curve under simple loading condition, the coordinated relationship between the tangential deformations of the cartridge ease and chamber, and the coordinated relationship between the axial deformations of the cartridge ease and the locking mechanism. The comparison for calculated and experimental results of case-bolt force are also given.