In order to investigate whether roof thickness,penetration rate and weld size can improve the fa-tigue performance of welded joints,based on the ANSYS-FRANC3D co-simulation method,the effects of different load forms and different crack growth stages were considered to comprehensively evaluate the effects of three measures on the fatigue performance of welded joints.The results show that under vertical load,only increasing the roof thickness can improve the cracking condition at the welding root;with in-creasing the roof thickness at short crack stage and long crack stage,the stress intensity factor decreases by 30.57％and 28.54％respectively;meanwhile,the fatigue cracking condition at the welding root under multiple failure modes can also be improved.Under horizontal load,the fatigue cracking at the welding root can be improved only by increasing the penetration rate.Compared with single failure mode,the crack cracking probability of short crack stage and long crack stage in the multiple failure mode is increased by 7.58％and 8.93％respectively.
维普
万方数据