Abstract
Two test types were conducted to examine the effects of different loading histories, closure loads and stress ratios on fatigue threshold of a titanium alloy. Both test types maintained a constant maximum stress intensity factor, Kmax, but one with increasing minimum stress intensity factor, Kmin, and other with decreasing Kmin. The results of these tests were compared to the results of a previous study using the ASTM standard threshold measurement test (constant R and decreasing Δ K) and another threshold test with constant R and increasing ΔK. Analysis of the data indicated that threshold stress intensity factors (ΔKth) were dependent on stress ratio. The effective threshold stress intensity factors adjusted for closure, ΔKeffth, were not dependent on stress ratio.
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