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Fatigue performance of hot-rolled ribbed-steel bar with the yield strength of 500 MPa (HRB500) was studied with bend-rotating fatigue test at a stress ratio of R = − 1. It is determined by staircase method that its fatigue strength for 107 cycles is 451 MPa, which is higher than that of common carbon structural steel. This should be attributed to the fine-grain strengthening resulting from the high...
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