旋转自紧身管承载性能及工艺参数优化研究OA

To elucidate the mechanism enhancing the load-bearing performance of gun barrels by rota-tional autofrettage technology,this study established a finite element model characterizing the stress distri-bution in normal barrels under chamber pressure.A systematic comparative analysis was conducted on the evolution of residual stress fields following autofrettage treatment at varying angular velocities.Subse-quently,chamber pressures of 450 MPa and 320 MPa were applied to the autofrettaged barrels to com-pute their stress responses during simulated firing.The research proposed a theoretical correction method for the plastic radius based on the Von-Mises yield criterion,effectively resolving the inaccuracies inherent in solutions derived from the traditional Tresca criterion.The corrected theoretical results showed excel-lent agreement with numerical simulations.By quantitatively analyzing the correlation between peak Von-Mises stress and autofrettage process parameters,the optimal angular velocity window(4 680～5 205 rad·s-1)and optimal overstrain range(32%～97%)for the rotational autofrettage process of the studied barrel were determined.These findings provide a critical design basis for engineering applications.