Comparison between Fractal and Statistical Approaches to Model Size Effects in VHCF

Size effects concern the anomalous scaling of relevant mechanical properties materials and structures over a sufficiently wide dimensional range. In last few years, thanks to technological advances, such have been experimentally detected also in very high cycle fatigue (VHCF) tests. Research groups at Politecnico di Torino are active this field, observing size on strength, life limit up VHCF regime for different metal alloys. addition, theoretical models put forward explain these effects. present paper, two them introduced, respectively based fractal geometry statistical concepts. Furthermore, comparison between experimental results is provided. Both able predict decrement conventional limit.