Research On Numerical Simulation Technology Of Rotary Impact Welding Process

Metal composite materials have excellent performances such as high strength,corrosion resistance,and high temperature resistance,and have received extensive attention in various fields.However,as the main processes for the production of composite materials,such as explosion welding and stud welding,there are certain defects,and metal composites in minute areas cannot be realized.Therefore,based on this,this topic proposes a new solid phase connection technology-rotary impact welding.This paper systematically introduces the rotary impact welding technology,determines the selection of process parameters,focuses on the setting method needed for numerical simulation of the process,and analyzes the simulation results of the welding process.Combined with the experimental results,verify the accuracy of the simulation.1.This paper mainly introduces Bahrani mechanism,flow instability mechanism,vortex street mechanism and stress wave mechanism related to rotary impact welding.Through the analysis of the stress wave theory,the relationship between material sound velocity,bullet impact velocity and collision angle is studied and determined,and the effective parameter interval is determined.2.The basic theory of explicit dynamics is analyzed,and the similarities and differences of Lagrange,ALE and SPH algorithms are described.Combined with the numerical simulation of rotary impact welding,the SPH method is most suitable.By analyzing the relationship between the size of the bullet and the shape of the welding interface in this subject,combined with the experimental conditions,the ideal finite element parameters are obtained as the particle size 25?m,the material model is the Johnson-Cook model,the Grüneisen equation of state,and the boundary condition is the full surface fixation and face contact types.3.Through the numerical simulation of the rotary impact welding process,thewaveform morphology,metal jet and single wave formation process of the welding interface are analyzed.The pressure,equivalent plastic stress,strain,strain rate and temperature distribution of the welding interface are explored.It is concluded that in addition to the stress wave,the generation of metal jet is also an important condition for the success of rotary impact welding.4.Change the impact conditions such as impact velocity and collision angle of the bullet,simulate the welding process under different process conditions,and compare and analyze the influence of different process conditions on the characteristics of the interface wave.The selection of the angle of incidence has a direct impact on the formation of the interface wave.Based on the comparison with the experimental results,the feasibility of the numerical simulation method of this subject is illustrated and can be used as a theoretical guide for further experiments.