To address the issues of the low computational efficiency of solid element models and poor computa-tional accuracy of shell element models in welding simulation of large structural components,the hybrid ele-ments were used to establish a finite element model,the selected boundary between the solid and shell ele-ments was analyzed and determined.The hybrid element modeling method was used to weld and imitate large hollow thin-walled aluminum alloy structural parts.The results were compared and analyzed with the simula-tion results of the solid element model,and the hybrid element modeling method was used to build the welding simulation model of the large hollow thin-walled structural parts.The results show that the division position of the plate shell and solid elements is 18 mm perpendicular to the direction of the welding line.Besides,the temperature and deformation prediction obtained by the hybrid prediction model based on the binding connec-tion method is the most accurate,and the prediction errors are 1.1%and 8.6%,respectively.Furthermore,the residual stress prediction obtained by the hybrid prediction model based on the coupling connection method of shell and solid is the most accurate with a prediction error of 0.25%.Compared with the pure solid element model,the computation of the solid element model is about 1.7 times that of the hybrid element model,and the efficiency improved by using the shell solid coupling connection is the highest,which can improve the cal-culation efficiency by about 41.6%,compared with the pure solid element.
large hollow thin-walled structural partshybrid element modelingwelding deformationcalcu-late efficiency
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