A direct correlation between fractal dimension and fatigue loading was established. High-resolution optical 3D measurement studies were performed on the entire fracture surface. Fracture surfaces after biaxial fatigue tests were compared using fractal dimension for three types of metallic materials in smooth and notched specimens made of S355J2 and 10HNAP steels and 2017-T4 aluminium alloy, considering both proportional and nonproportional cyclic loading.
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