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In this paper, the author studied the effects of different stress ratios(R) and stress concentration factors(Kt) on the fatigue properties of WSTi6211 titanium alloy.Through S-N curve, the author obtained the fatigue ultimate strength of the material under different conditions and analyzed characteristics of fatigue fractures, including the crack source sourse, the crack growth region and the final rupture region. The results show that when Kt=1, R=0.5, the fatigue ultimate strength σD isdoi:10.1051/matecconf/202032111065 fatcat:fssf3qd7nra47cax74wofwzx74