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The effect of surface defects, especially micro scratches, on the fatigue strength of the TC17 titanium alloy is studied in this paper. An ultrasonic fatigue experiment was conducted to obtain the geometric parameters of the surface scratches and the corresponding fatigue data. Fatigue failure of the specimens occurred from the scratches in this experiment. A new parameter area Δ is proposed to describe the fatigue damage caused by mechanical scratches; it is defined as the square root of the triangular area of a scratch section. A modified fatigue strength model of TC17 with a consideration of the mechanical scratches is established by applying the Murakami model and the term area Δ . Compared with the reported models, the new model is demonstrated to be more suitable for the fatigue-strength prediction of TC17.

Fatigue-strength analysis in the very-high-cycle regime of the TC17 titanium alloy with micro scratches