Lecture
This lecture covers the concept of plasticity in materials, focusing on the deformation behavior of metals, ceramics, and polymers. It explains the relationship between stress, deformation, and the Young modulus, highlighting the differences in mechanical behavior among these materials. The lecture delves into the plasticity mechanisms of metals, discussing dislocations, work hardening, and the energy dissipation during deformation. It also explores the impact of defects in crystalline materials and the role of dislocations in facilitating plastic deformation. The importance of ductility, yield strength, and strain hardening rate in characterizing material behavior is emphasized.