In order to understand effects of the hook tip radius and effective thickness on the fatigue life of the frictional stirring welded magnesium alloy lap joints

the finite element models at different effective thickness and hook tip radius were established.The tensile mechanical response of simulation testing was analyzed by the finite element software

and local stress and strain distribution of the lap joints were analyzed under varied external loads.In addition

fatigue life of lap joints was predicted by fatigue damage equation of SWT and MC.The results show that stress concentration is mainly located around the hook tip of the lap joint

and fatigue damage equation of SWT can predict more accurately fatigue life of the joints.With the increases of hook tip radius and effective thickness

the fatigue life is increased.