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Course Postgraduate
Semester Electives
Subject Code CHM866
Subject Title Mechanical Behaviour of Materials

Syllabus

Review of structure and bonding in materials; Elastic, plastic and visco-elastic behavior; Yield criteria, failure, ductile to brittle transition; Linear elastic fracture mechanics; Elastic-plastic fracture mechanics- strengthening mechanisms, fatigue, creep; Super plasticity- tests of plastic behavior, embrittlement of materials

Detailed version

Concept of stresses and strains, Engineering stresses and strains, Different types of loading and temperature encountered in applications, Tensile Test- stress-strain response for metal, Ceramic and polymer, Elastic region, Yield criteria, Yield point, Plastic deformation, Necking and fracture, Bonding and Material behaviour; Theoretical estimates of yield strength in metals and ceramics, Mechanical properties of materials in small dimensions-nano indentation

Crystals and defects, Classification of defects, thermodynamics of defects, Geometry of dislocations, Concepts of plastic deformation by slip and twinning, Slip systems in FCC, BCC and HCP lattices, Critical resolved shear stress for slip, Theoretical shear strength of solids, Stacking faults and deformation bands; Observation of dislocations, Climb and cross slip, Dislocations in FCC and HCP lattice, Partial dislocations, Stress fields and energies of dislocations, Forces between dislocations, Interaction of dislocations, Dislocation sources and their multiplications, Frank Read and grain boundary sources, dislocations in ceramics and glasses

Strengthening from grain boundaries, Grain size measurements, Yield point phenomenon, Strain aging, Solid solution strengthening, Strengthening from fine particles, Fiber strengthening, Cold working and strain hardening, Annealing of cold worked metal

Fracture in ceramics, Polymers and metals, Different types of fractures in metals, Fracture mechanics- linear fracture mechanics- KIC, elasto-plastic fracture mechanics- JIC, Measurement and ASTM standards, Design based on fracture mechanics, Effect of environment, Effect of microstructure on KIC and JIC, Application of fracture mechanics in the design of metals, Ceramics and polymers

S-N curves, Low and high cycle fatigue, Life cycle prediction, Fatigue in metals, Ceramics and polymers; Effect of stress concentration on fatigue, Size effect, Surface effects and fatigue, Creep and stress rupture, Creep curve, Stress rupture test, Mechanism of creep deformation, Activation energy for steady state creep, Superplasticity, Fracture at elevated temperature, Creep resistant alloys, Creep under combined stresses

Text Books

1.        G.E. Dieter, Mechanical Metallurgy, 2nd ed., McGraw-Hill, 1976.

2.        R.W. Hertzberg, Deformation and Fracture Mechanics of Engineering Materials, John Wiley & Sons, 1989.

3.        J. Roesler, H. Harders, M. Baeker, Mechanical Behaviour of Engineering Materials: Metals, Ceramics, Polymers, and Composites, Springer-Verlag, 2007.

References

1.        T. H. Courtney, Mechanical Behavior of Materials, McGraw-Hill, 1990.

2.        R. Hill, E. Robert, Physical Metallurgy Principles, 2nd ed., East West Press, 1972.

3.        W.M. Hyden, W.G. Moffatt, Structure and Properties of Materials, Vol. 3, McGraw Hill

4.        M.A. Meyers, K.K. Chawla, Mechanical Behavior of Materials, 2nd ed., Cambridge University Press, 2009.

5.        W.F. Hosford, Mechanical Behavior of Materials, Cambridge University Press, 2005.

6.        R.W.K. Honeycombe, Plastic deformation of Metals, 2nd ed., Edward Arnold Press, 1984.