ME721A |
THEORY OF PLASTICITY |
Credits: |
3-0-0-9 |
Concise syllabus
Mathematical preliminaries; stress and strain; constitutive responses; physics of plasticity; application of plasticity theory for different materials; Formulation of rate-independent plasticity; maximum dissipation postulate; yield criteria; flow rules and hardening rules; uniqueness theorems; extremum principles in plasticity; limit analysis; shakedown theorems; plane problems in plasticity; slip line theory and its applications; plastic stability; plastic buckling; global and local criteria of plastic stability; strain localization and shear bands; dynamic plasticity; waves; special topics from current research.
Detailed syllabus
I. (Introduction)
- Lecture 1: introduction to the concept of plastic deformation using simple ideas and familiar examples
- Lecture 2: On the role of microstructure and thermodynamics in plastic deformation
- Lectures 3-4: Revision of relevant concepts from continuum mechanics
- Lecture 5: Constitutive responses: elastic, viscoelastic, plastic, viscoplastic, anisotropy etc.
- Lecture 6: Physical overview of crystal plasticity, plasticity of granular media, plasticity in rubber-like materials, etc.
II. (Rate independent plastic deformation)
- Lecture 7: Rate dependent and rate independent plasticity
- Lecture 8: Plastic strain, incremental strain, objective rates, and hardening variables Lecture 8: Yield criteria
- Lecture 9: Ilyushin’s postulate of maximum plastic work (including Drucker’s postulate)
- Lecture 10: Maximum dissipation and normality rule (Associated flow rules)
- Lecture 11: Hardening rules (isotropic and kinematic)
- Lecture 12: Non-associated flow rules
- Lectures 13-14: Axisymmetric problems in plasticity
III. (Plane problems in Plasticity)
- Lecture 15: Basic equations of plane strain and plane stress
- Lectures 16-17: Slip lines and their properties
- Lectures 18-20: Solution to several problems (such as indentation, necking, drawing, etc)
- Lecture 21: Application of slip line theory (Geophysics, tectonics, metal forming, etc.)
IV. (Some theorems in plasticity)
- Lectures 22-24: Uniqueness theorems and variational principles in plasticity
- Lectures 25-27: Limit analysis and shakedown theorems
V. (Plastic stability and waves)
- Lecture 28: The concept of plastic stability
- Lectures 29-30: Global stability criteria according to Hill
- Lectures 31-32: Elastoplastic column buckling
- Lectures 33-34: Local stability criteria (localization, shear bands, ellipticity)
- Lecture 35: Introduction to dynamic plasticity Lecture
- Lectures 36-37: One-dimensional waves
VI. (Topics from current areas of research)
- Lectures 38-40: Phase transformation and plasticity, strain-gradient plasticity, dislocation plasticity, crystal plasticity, etc (instructor can pick topics according to his/her taste)
References:
- Plasticty Theory, J. Lubliner
- Fundamentals of the theory of plasticity, L. M. Kachanov
- Nonlinear Solid Mechanics, D. Bigoni
- Plasticity: Fundamentals and applications, P. M. Dixit and U. S. Dixit5. Theory of Plasticity, J. Chakrabarty