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| Effect of Service Loads on Residual Stresses of Al–Li Alloy T–Joint Using Laser Welding Through FE Analysis |
| ZHOU Xudong, WU Youfa, CHEN Shuai, ZHAN Xiaohong |
| ( School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China ) |
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Abstract This study reveals the evolution rule of welding residual stress of aluminum–lithium alloy skin-stringer T–joint under service load. Firstly, the 3D thermal-structural finite element model of T–joint dual laser-beam doubleside synchronous welding process was established, and the reliability of the model was verified by experiments to obtain accurate welding residual stress. Subsequently, the welding residual stress, strain distribution and total equivalent plastic strain were taken as initial conditions, and the finite element numerical analysis was combined with the elastic-plastic structural model to study the residual stress redistribution of the T–joint under service load. The results show that after the end of the applied load, the longitudinal stress relaxation of the skin is obvious (especially at the weld), and the longitudinal stress in the middle of the stringer is not sensitive to the service load.
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2020, 
