Deformation and Fatigue Phenomenon

This lecture covers the deformation and fatigue phenomenon in materials, focusing on how cyclic stresses can lead to the localization of deformation, damage, and rupture. The instructor explains how materials are altered under cyclic stress, affecting various moving components like aircraft wings and turbines. Topics include plastic deformation under cyclic stress, types of cyclic loading, cyclic hardening and softening, and the evolution of dislocation structures during cyclic deformation. The lecture also discusses the measurement of mechanical resistance to fatigue, endurance fatigue curves, and the influence of surface finish and stress concentrations on fatigue endurance. Additionally, the environmental influence on fatigue, such as corrosion, is explored.