Mechanical Properties of Materials II
- Introduction (a broad class of various fractures) - Brittle fracture versus ductile fracture - The cohesive strength of materials - Stress concentration and stress concentration factor
- Griffith theory - Plastic zone ahead of crack; the effect of parameters
- Stress state: Plane stress and plane strain - Macro- and micro-structural aspects of brittle and ductile fractures
- Micro-mechanisms of brittle and ductile fracture - Mechanisms of crack nucleation - Ductile fracture mechanism
- Three modes of fracture - Stress intensity and stress intensity factor - fracture toughness and parameters affecting fracture toughness
- Fracture toughness measurements - Ductile to brittle transition temperature (nil ductility temperature) - Impact testing, determining NDT - Fracture of ceramics
- Metallurgical embrittelements - increasing the resistance to fracture
- Introduction to fatigue, types of cyclic stress - Macrostructural aspects of fatigue - S-N curve and its affecting parameters
- Controlled-stress fatigue, controlled-strain fatigue - Microstructural aspects of fatigue, serrations and their characteristics - Accumulative damage in fatigue, Miner's rule
- da/dN-?K (، Fatigue-crack nucleation mechanisms - Stage I and II of fatigue crack propagation - Calculation the fatigue crack propagation (da/dN-?K)
- Fatigue life calculation - Effect of mechanical and metallurgical parameters on fatigue - increasing the resistance to fatigue
- Introduction to creep, creep curve, creep stages - effect of temperature on materials properties/behaviors - Types of creep with respect to ? and T combination
- Creep equations, creep-rate calculation - Activation energy of creep, parameters affecting Q - creep mechanisms (dislocation creep versus diffusion creep)
- Role of grain and grain boundary - GB sliding and its mechanisms - GB migration and its mechanisms
- Effect of alloying elements and precipitates, - High temperature alloys, thermally stable precipitates - creep embrittelement, types of creep fracture - increasing the resistance to creep