Subject Code: ML3L003 Subject Name: Mechanical properties and testing of materials L-T-P: 3-0-0 Credit: 3
Pre-requisite(s): Introduction to Materials Science and Engineering
Elements of theory of elasticity: Elastic and plastic behaviour; Concept of Strain and Stress; States of Stress in two and three dimensions; Elastic Stress-Strain Relations;
Yielding and Plastic Deformation: Hydrostatic and deviatoricstress;octahedral stress; yield criteria and yield surface; texture and distortion of yield surface; limitation of engineering strain at large deformation; true stress and true strain; effective stress; effective strain; flow rules; strain hardening;Ramberg-Osgood equation; stress -strain relation in plasticity; plastic deformation of metals and polymers
The Tension Test: Engineering Stress-Strain Curve, True-Stress-True-Strain Curve, Instability in Tension, Stress Distribution at the Neck, Ductility measurement in Tension Test, Effect of Strain-Rate on Flow Properties; Effect of Temperature on Flow Properties; Influence of Testing machine on Flow properties; Constitutive equations; Stress Relaxation Testing; Notch Tensile Test; Extraction of elastic and plastic material properties of different materials from uniaxial loading experiments
The Hardness/Indentation Test: Types of indenters; Hardness Tests: Knoop, Vickers, Brinell, Meyers, Rockwell; Load vs displacement curve obtained during nanoindentation test; Analysis of nanoindentation test data
The Torsion Test: Mechanical Properties in Torsion, Torsional Stresses for Large Plastic Strains, Types of Torsion Failures, Comparison between Torsion test and tension test
Deformation under cyclic load - Fatigue: S-N curves; low and high cycle fatigue; life cycle prediction; fatigue in metals, ceramics and polymers
Introduction to fracture toughness testing: Strain energy release rate, stress-intensity factor, fracture toughness and design; KIcPlain Strain Toughness Testing; ; Impact testing; Indentation fracture toughness testing
Wear testing: recognition of different lubrication regimes, seizure mechanisms, lubricant behaviour, and effect of load, temperature, and sliding speed on friction and wear properties of bearing materials
Dynamic Mechanical Analysis: Introduction to concepts of anelasticity and viscoelasticity; measurement of storage modulus and loss modulus
Text/Reference Books:
  1. Mechanical Metallurgy, Third edition, Fifth Reprint, George E. Dieter, Indian edition, McGraw-Hill Education (India) Private Limited, 2014.
  2. Mechanical Testing of engineering Materials, First edition, Kyriakos Komvopoulos, University Readers, 2011.
  3. Deformation and Fracture Mechanics of Engineering Materials, Fifth Edition, Richard W. Hertzberg, Richard P. Vinci, Jason L. Hertzberg, Wiley India Edition, 2013.
  4. Nanoindentation, Third Edition, Anthony C.  Fischer-Cripps, Springer, 2011.
  5. Dynamic Mechanical Analysis: A Practical Introduction, First Edition, Kevin P. Menard, CRC Press, 2008.
  6. Friction, Wear, Lubrication: A Textbook in Tribology, Kenneth C. Ludema, CRC Press, 1996.