Simulation Calculation of Shell Extraction Force for Naval Guns Based on Elastic-plastic Model
The loading force of the barrel after firing has an important effect on the initial velocity of the shell extraction.During the loading process,the barrel exhibits large elastic-plastic deformation,and the loading is very uneven from mouth to bottom.The simplified two-di-mensional model and thin-walled cylinder analytical model can no longer meet the quantitative analysis needs.A dynamic simulation model based on the elastic-plastic extraction process was established,and Johnson-Cook constitutive model was used to describe the elastic-plastic large deformation behavior of the cartridge.Parameters such as dynamic stress and strain,contact force and friction force of the cartridge and gun bore were obtained through simulation calculation,and the dynamic loading law and force characteristics of the cartridge were analyzed.The simulation results show that during the firing process,the barrel of naval gun goes through four stages:bolt attaching,radial free expan-sion to bore attaching,co-deformation with bore after bore attaching,and rebound to the equilibrium state.After the equilibrium state,the resistance of shell extraction no longer changes and remains at about 13320N,and the muzzle velocity of shell extraction after the cylinder acting on the barrel reaches 18.9m/s.The muzzle velocity can meet the design performance requirements of high-speed continuous firing of naval guns.
Naval gunJamming of shell caseExtraction forceElastic-plastic model
NETL
NSTL
万方数据
维普
