Abstract
This work presents the relationship between fracture surface morphology, fatigue loading conditions and notch radius. Some specimens have been destroyed during fatigue tests under bending with torsion. Then, the fracturing surfaces of the rectangular cross-section specimens AW-2017A-T4 with notches have been analysed.This study presents fractal analysis for quantification of the geometry of the fracture surface. Surface geometry analysis is carried out on the whole fracture surface, using fractal dimensions and, surface isotropy. Fracture surfaces are observed using a focus variation microscope (FVM), which allows the acquisition of data sets with large depth of focus.A correlation between fractal dimension and stress concentrator, fatigue loading history, and total fatigue life is examined. These systematic dependencies may serve as a basis for extracting fatigue loading information from fracture surfaces of destroyed materials and structures.
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