The partitioning point dividing ΔK into ΔKeff, denoted Kop. was determined for Al 7475-T7351 and the Ni-base alloy Nicrofer 5219 Nb annealed. The experimental testing technique used relies only on the fatigue crack propagation behavior, i.e. whether a fatigue crack can propagate or can not propagate. It was found that Kopfor Al 7475-T7351 is a steadily increasing function of the R-ratio and Kmax, up to an upper bound value depending only on Kmax. This upper bound value is denoted as Kop(max. value). The Kopdetermined for Nicrofer 5219 Nb annealed is a steadily increasing function of the R-ratio and Kmaxonly; no upper bound value exists for this material. Kop, Kmaxas a function of the R-ratio for both materials, and the locus of Aop(max. value) as a function of Kmaxfor Al 7475-T7351 are represented in the form of polynomial equations.
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