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Many experimental observations show that the finite-life fatigue strength ofmetallic materials in the high-cycle regime decreases with increasing thespecimen size. Such a decrease can be explained by considering the fractal natureof the reacting cross-sections of structures. Accordingly, the so-called fractalfatigue strength is represented by a force amplitude acting on a surface with afractal dimension lower than 2, where such a dimensional decrement depends onthe presence of damage (cracks, voids) and heterogeneity in the material ligament.A monofractal scaling law for the finite-life fatigue strength of metals is hereinproposed, and some experimental results are examined to show how to apply sucha theoretical approach.