Numerical Simulation And System Optimization Of The Bore Of The Large-caliber Artillery Barrel

Interior ballistic performance and service life,which are important tactical characteristic of the gun,is affected directly by wear of the bore.During the design of the gun,researchers rely heavily on experimental data and empirical methods for research,and usually ignore the failure mechanism of the body tube.The internal wear of the bore is based on ablation wear and mechanical wear,including:At present,the study of ablation wear of the bore stays in thermal and chemical factors,and usually ignore the influence of mechanical factors.Aiming at this problem,a friction temperature rise model is proposed,which contribute heat factor by mechanical motion friction heat generation;Meanwhile,the degeneration model of ablation wear is renewed based on the friction temperature rise model,and gain the formula that calculate the degeneration model of ablation wear.And through the finite element method,it traverses the development process of ablation wear in the whole bore.The results show that the ablation wear is mainly concentrated in the beginning of the bore and the rifle,and the whole is monomodal,and the maximum wear can reach 1.8mm.Now,the research on mechanical wear mainly focuses on cutting tools,and the influence of mechanical wear is generally ignored in artillery launching process.In order to solve this problem,friction wear are introduced into artillery launching process based on Archard wear theory,and the friction coefficient formula of interior ballistic process is revised.On this basis,the degradation model of friction wear materials suitable for artillery launching process is deduced.The peening wear is introduced into the gun launching process.Based on the elastic mechanics,the action time of the impact process is deduced.On this basis,the degradation model of the peening wear material is deduced.And through the finite element method,it traverses the development process of mechanical wear in the whole bore.The results show that the mechanical wear mainly concentrates on the muzzle,and the wear distribution is more uniform,generally up to 0.4 mm.There are two methods of reducing barrel wear and increasing service life are proposed.The one is three-layer electroplating(copper-nickel-chromium plating)to improve the high temperature,friction and impact resistance of the bore.And through the finite element method,it traverses the development process of wear in the whole bore.The other is the structural optimization design.By drawing up the test design table of artillery and ammunition parameters,the finite element model is established and solved.Based on the data samples obtained from the calculation,an approximate optimal design model is established to characterize the wear of the bore.Meanwhile,the approximate model is used to replace the original finite element model,and the genetic algorithm is used to optimize the calculation so that gain the optimal solution of the bore-wear.