Dynamic Simulation And Structural Optimization Of Titanium Alloy Base Sheet Of Mortar Welded Structure

The based plate is the main bearing part in the process of mortar firing,which occupies the larger mass of the whole gun.The titanium alloy welding structure is widely used in the lightweight design of the mortar based plate,and the welding property of the titanium alloy has a great influence on the strength of the plate.The study of dynamic mechanical properties of titanium alloy weld is of great significance to the design and optimization of titanium alloy mortar plate with welding structure.This paper takes the pre-research project as the background.The design of the titanium alloy plate of the mortar welding structure is carried out,and the dynamics simulation analysis and structure optimization are carried out.The main research contents are as follows:Firstly,the finite element simulation model of TC4 titanium alloy welded joint was established.The distribution of residual stress of TC4 titanium alloy welded joint was obtained through simulation calculation.The impact resistance finite element model of TC4 titanium alloy target plate was established,and the welding residual stress was introduced into the simulation model to obtain the impact resistance dynamic characteristics of welded joints.Secondly,according to the impact resistance of welded joints,a titanium alloy plate with mortar welding structure was proposed and designed.The finite element analysis model of the mortar plate was established,and the dynamics simulation analysis of the full mortar was carried out under four working conditions.The stress and displacement distribution of the based plate,as well as the disturbance response of the muzzle,were obtained.The result shows that the designed plate satisfies the performance requirement.Thirdly,the net-shape plate structure optimization model of titanium alloy welding based plate was established,and the topology optimization,shape optimization and size optimization of the net-shape plate were performed.The force transfer path of the pulley plate was obtained,and the topological structure,optimal shape and size of the pulley plate were determined.The weight of the optimized table plate was reduced by 12.65%.The dynamics simulation analysis of the optimized plate was carried out.The results showed that the strength of the rear-seat pulley plate and the vibration of the muzzle were similar to those before the optimization,which met the requirements of the strength and firing stability of the mortar plate.Fourthly,a composite mortar based plate design method was proposed,by using the composite material to replace the non-main bearing part of the pulley plate,and the plate tectorial distribution and lay-up design were performed.Through impact test of composite laminates,the rationality of composite finite element modeling is verified.The finite element model of composite mortar board was established to simulate and analyze the dynamics of mortars.The results showed that the stiffness strength was close to or better than the original pulley board,and the weight was further reduced.The research results of this paper have certain theoretical reference value and engineering application value for the design and optimization of the titanium alloy mortar based plate with welding structure.