Mechanism of deformation and nucleation of fatigue cracks in aluminum polycrystals under alternating bending

Multi-purpose fatigue sensor. Part 2. Physical backgrounds for damages accumulation and parameters of their assessment

“…The analysis of the localization geometry of the strain spots and data on the optical-digital inspection allow concluding on the nonuniformity of the damaged zone development. This is L supported by data [1][2][3] where the accumulation of damages as a sequence of stages of strain localization is considered. In our case, the activation of additional sliding planes at the complex "bending + torsion" loading scheme increases the formation intensity as well as localization in comparison with the bending loading scheme.…”

“…here is a number of physical backgrounds that explain the nature of an ordered surface relief formation including ones based on the principle of self-ordering [1][2][3]. One of the most well-known concepts is underlined by the effect of "chessboard" (ordered pattern) of normal compressive/tensile stresses and strains distribution in surface layers and interfaces of solids to occur under the impact of external loading (mechanical, thermal, electrical, etc.).…”