Mechanical Properities of Materials (I)
- Stress tensor and principal stresses
- Elastic behavior. Three dimensional Hooks relation. Elastic strain energy
- Plastic behavior of materials. stress-strain curves in tension. yield stress. tensile stress. necking. yield criteria effect of stain rate and temperature on yield stress
- Theoritical strength of crystals. Dislocations naturre. Types of dislocations. Burgers vector.Doslocation movement, Glide-Cross slip climb .Elastic energy of dislocations
- Dislocation interactions. Dislocaation multiplications. Partial dislocations. Cottrel-Lomer locking. Stacking fault energy. Thompsons tetrahedron
- Dislocation in FCC, BCC and HCP crystals. Slip: Geometrical and physical aspects. Twining: Types and mechanism of formation,.Texture
- Strengthening mechanism in solid solution. yield point phenomenon. Snoek effect. Portevine Le Chatolier effect
- Percipitation hardening. Interaction of dislocations with coherent, semi-coherent and incoherent percipitates. Dispersion hardening
- Effect of grain size on mechanical properties.Strengthening due to grain boundary
- Stress-strain curves of single crystals. Stages 1, 2 and 3 of work-hardening. Strengthening mechanisms in single crystals. Effect of temperature.
- Macroscopic aspects of fracture. Stress concentration. Griffiths theory. Orrowans theory-Irwines theory.Carck tip Plastice zone. stress intensity factor.fracture toughness. Microscopic aspects of fracture. Brittle fracture. Ductile fracture. Inter-granular fracture.
- Fatigue, microscopic and macroscopic aspects of crack growth and Paris low
- Creep, creep curves and creep behavior in the short and long term, Mechanisms and procedures of larson-mihler extrapolation,
The deformation mechanism maps,