Analysis of stresses and strains in three dimensions: Principal stresses and strains. Stress / Strain Invariants, Octahedral stresses, Theories of Failure, Various yield criteria.
Repeated stresses and fatigue in metals: Fatigue tests, endurance limit. Fatigue under combined loadings. Fatigue design theory: Goodman, Gerber and Soderberg criteria. Factors influencing fatigue behavior of metals: Frequency, temperature, size, form, surface conditions, residual stress, etc. Influence of stress concentration, Notch sensitivity. Various mechanical and metallurgical methods used for improving fatigue strength of metals. Effect of corrosion, Corrosion fatigue and fretting. Cumulative fatigue damage and life estimation of components.
Fracture mechanics: Basic modes of fracture. Griffith theory of brittle fracture and Orwon’s modifications. Linear Elastic fracture mechanics: Stress field ahead of crack-tip, Stress Intensity factors, Critical SIF, Fracture toughness testing and evaluation of KIC. Elasto-plastic fracture mechanics: Plane stress and plane strain plastic zone sizes. J-Integral method. SERR computations and evaluation of structural integrity.
Creep behavior of metals: Creep–stress-time-temperature relations, creep testing methods. Mechanics of creep, creep in tension, bending and torsion. Strain-hardening effects on creep. Creep buckling, members subjected to combined stresses and creep.
Recommended Books:
- Engineering Fracture Mechanics – S. A. Meguid (Springer)
- Elementary Engineering Fracture Mechanics – David Broek (Springer)
- Fracture Mechanics – C. T. Sun and Z. H. Jin (Elsevier)
- Elements of Fracture Mechanics – Prashant Kumar (Tata Mcgraw Hill)
- Fundamentals of Fracture Mechanics – TribikramKundu (CRC Press)
- Mechanical Metallurgy – George E. Dieter (McGraw-Hill)
- Mechanical Behaviour of Materials – Norman E. Dowling (Prentice Hall)
- Metal Fatigue in Engineering – R. I. Stephens and H. O. (Willey)
- Creep of Engg. Materials – I. Finnie and W. R. Heller (Mc Graw Hill Book Co.)
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