Lecture
This lecture covers the behavior of elastic-plastic materials near crack tips, emphasizing the importance of the plastic zone in crack resistance and the limits of linear elastic fracture mechanics. It discusses the estimation of crack tip plastic zone size, the influence of remote and local stresses, and the applicability of linear elastic fracture mechanics. The lecture also explores the effects of changing stresses on the specimen, the estimation of crack tip zone size, and the behavior of cracks in different stress conditions.