Simulation Of Temperature Field,Stress Field And Mechanical Properties Of Foam Aluminum Welding Joint

Nowadays,with the continuous progress of science and technology,traditional engineering materials have been unable to meet the requirements of structural and functional materials,and the appearance of aluminum foam provides a new way for people.At present,in aviation industry,machinery manufacturing,rail transit and biomedicine and many other fields,have a large number of use.However,it is difficult to prepare large area aluminum foam sheet directly,so the research on aluminum foam welding process is of great significance.In this paper,the welding process of closed cell aluminum foam plate with size of 100 mm×100 mm×20 mm was studied.In order to make the simulation result more close to the actual welding situation,the moving Gaussian heat source was applied by ANSYS finite element simulation software.After the calculation result of temperature field was obtained,the stress field was solved by indirect method,and the finite element result of mechanical properties of aluminum foam welded joint was simulated and analyzed.The main contents are as follows:(1)The hypothesis of geometric modeling of closed cell aluminum foam is proposed.The 3D Voronoi geometry model was created by Grasshopper plug-in running under Rhinoceros software environment,and the closed-cell foam aluminum sphere model was approximately obtained on this basis.(2)By observing and comparing the macro morphology and cross section of welded joint obtained by actual experiment and simulation,the variation rule of penetration depth and width of closed-cell aluminum foam welding pool as well as the forming effect of weld were analyzed with the increase of welding current and the filling of AlSi welding wire intermediate layer.(3)By observing the temperature field nephograph and thermal cycle change curve under different current parameters,the change rule of the maximum molten pool temperature in the process of closed-cell aluminum foam welding and the change of each temperature node on the welds were analyzed with the increase of welding current and the filling of the middle layer of AlSi wire.By observing the stress field nephogram and stress variation curve under different current parameters,the medium effect force variation law of closed cell aluminum foam welding process was analyzed with the increase of welding current and with or without AlSi welding wire intermediate layer filling.At the same time,the longitudinal stress and transverse stress in different directions along the weld and vertical weld paths are analyzed.(4)By observing the three-point bending simulation process and bending strength-deflection curve under different current parameters,the change of flexural strength and stress distribution of the closed cell aluminum foam welded joint were analyzed with the increase of current parameters and the filling of the middle layer of AlSi wire.At the same time,the failure forms of welded joints are analyzed.By observing the quasi-static compression simulation process and stress-strain curves under different current parameters,the compression strength changes and stress changes of the closed cell aluminum foam welded joint were analyzed with the increase of current parameters and with or without the filling of AlSi wire intermediate layer.