ABOUT THE COURSE:In this course, we will learn about the mechanical behavior of materials, linking their atomistic mechanism to their macroscopic behavior. We will deal with the continuum mechanics in view of the elastic and plastic behavior of materials. We will study the creep, fatigue, and fracture of materials.INTENDED AUDIENCE: UG students or anyone who want to understand the deformation behavior of materialsPREREQUISITES: Should have successfully completed first year of engineeringINDUSTRY SUPPORT: It’s a core UG course, any industry involving the deformation or mechanical behavior of materials will be benefitted
Overview
Syllabus
Week 1:
- Introduction
- Elasticity, Definitions and units Originf of Elasticity
- Engineering Stress Strain Curve: Strength and Ductility
- True Stress- True Strain curve and Necking criterion
Atomistic basis of elasticity
Stress at a point & Poisson's ratio
Normal stresses & Shear stresses
Stress tensor: Representation of stresses & their independence
Plane stress & stress on oblique plane
Mohr's circle of stress
Principal stresses and strains
Concept of Strain
State of Strain at a Point
Hydrostatic and deviatoric stress state
Elastic stress strain relations & Elastic constants
Compliance and Stiffness tensor, and Elastic strain energy
Yielding criteria for crystalline solids
Atomistic mechanism of yielding and Slip
Resolved & critical resolved shear stress
Introduction to Dislocations: Edge and Screw
Mixed dislocation and Burgers circuit
Glide, cross slip and climb of a dislocation
Peach Koehler Equation
Stress field around dislocations
Dislocation interactions and strain hardening
Dislocation sources
Stacking faults in FCC
Dislocation locks
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Dislocation intersections: Jogs and Kinks
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Solid solution strengthening
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Yield Point phenomenon
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Precipitation hardening and dispersion strengthening
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Grain boundaries and grain boundary strengthening, Inverse hall-perch relation
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Twinning in materials
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Fracture: Griffith theory, Fracture mechanics, LEFM and EPFM
- Creep deformation and superplasticity
- Fatigue of Materials
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Different Mechanical characterization techniques
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Hardness, Impact testing, Nanoindentation, high strain rate testing
Taught by
Prof. Niraj Mohan Chawake
