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The effective stress intensity factor range ΔKeff of a Ti-6Al-4V alloy has been determined by using the threshold behavior of this material. The ΔKeff values thus determined are in complete agreement with the materials constant amplitude crack growth behavior. ΔKeff values determined from the opening load obtained by crack opening displacement (COD) and by back-face strain (BFS) are not consistent with the ΔKeff values obtained via threshold and cannot explain certain load sequence effects. This leads to the conclusion that COD and BFS measurements are unsuitable for the determination of ΔKeff, at least for this titanium alloy.

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