Numerical Simulation Analysis Of Temperature Field And Stress Field In Arc Additive Manufacturing

Arc additive manufacturing technology has many advantages,such as saving cost,hort construction period,and not limited by the size of workpiece.As a typical large-sized omplex structure,many workpiece sizes are too large.Therefore,the study of a dditive metal ommonly used in ships provides a new way for the rapid forming of lar ge-sized metal parts in ships.Aluminum alloy material has excellent performance,and i s helpful to reduce the body weight of the ship,improve the ship speed,in line with the requirements of the development of shipbuilding industry.So far,but the technolo gy to research focuses on the welding experiment process optimization and shape cont rol,affecting the increase of material forming quality of physical process such as tem perature field,stress field evolution study is less,so this article choose the numerical simulation technology based on MARC of 5083 aluminum alloy materials commonly u sed for ships to add material manufacturing,through research arc in order to increase the inherent law of the manufacturing process,in order to improve the actual material in the process of toughening material workpiece forming quality.First of all,based on the OTC A Ⅱ series pulse TIG welding robot system,for different process parameter s of aluminium alloy layers under single channel forming to choose the appropriate fo rming parameters obtained by forming A geometrical parameters as the finite element modeling basis of geometric model.Since most of the metal material performance para meters only stay in room temperature section,and for the thermal physical property p arameters of high temperature section is incomplete,is not conducive to the establish ment of the finite element model,so in the process of finite element model is establis hed in this paper,using the material performance simulation software JMatPro to this article increases the material used in the process of manufacturing aluminum alloy 5083 thermal physical properties of metal materials analysis and calculation,got the mater ials needed for modeling arameters.According to the actual working conditions,the cla dding layer model and mechanical boundary conditions were carried out,welding heat input parameters were set,and the heat source model was selected to obtain a more reasonable mathematical model for subsequent analysis and calculation.Secondly,based on the finite element model,the temperature field and stress fiel d of aluminum alloy multilayer single channel additive workpiece are calculated and a nalyzed.Results show that the temperature field,the increase of material artifacts withi n the larger temperature gradient,and with the increase of cladding layer,raising material artifacts internal heat accumulation phenomenon is obvious,but at the same time,the first layer increases the material state of thermal cycle curve,tend to be stable in terms of stress field,in the joint of substrate and the cladding layer is easy to produ ce stress concentration,and increases material artifacts in the cooling process of the lo ngitudinal stress plays a leading role in the formation of residual stress.Finally,the temperature field and stress field of the additive workpiece under diff erent forming path and interlayer cooling time are calculated.The results show that the forming path will affect the heat dissipation,residual stress and deformation of the a dditive workpiece.In general,the forming effect and stress distribution of the cross add itive are better than that of the same direction additive,which can guarantee the formi ng efficiency of the workpiece and the quality of the workpiece.Increasing the cooling time between layers will reduce the heat accumulation of the additive workpiece and improve the residual stress of the additive workpiece.In this paper,the temperature field and stress field in the arc additive manufactur ing process are numerically simulated and calculated,and the law and characteristics o f the evolution of heat and force in the additive manufacturing process are revealed.The influence of different forming paths and interlayer cooling on the additive workpi ece is studied,which provides theoretical support for improving the forming quality.