Fracture and Toughness of Materials

This lecture covers the concepts of fracture and toughness of materials, focusing on the stress intensity factor, surface energy, and crack propagation. The instructor explains the relationship between surface energy, elastic modulus, and the critical stress for crack advancement. The lecture also discusses the differences in behavior between ideal elastic materials and those with plasticity, highlighting the importance of toughness in material resistance. Various material properties such as ductility, plasticity, and fracture toughness are explored, providing insights into the mechanisms governing material failure.