Course Details
Subject {L-T-P / C} : MM5222 : Fracture, Fatigue and Wear of Metals { 3-0-0 / 3}
Subject Nature : Theory
Coordinator : Prof. Krishna Dutta
Syllabus
MODULE I – Fatigue
Details: Basic understanding of fatigue, high and low cycle fatigue under symmetric and asymmetric cycling, ratcheting. Cyclic hardening – softening features, Micromechanisms of crack initiation and growth, fracture surface analyses. Stress and strain approaches of fatigue, Fatigue crack growth, Metallurgical variables and fatigue, Corrosion fatigue.
MODULE II: Fracture
Details: Theoretical cohesive strength of metals, Griffith’s theory of brittle fracture, Fractographic aspects of fracture, Mechanism of brittle and ductile fracture, Fracture of composites, Notch effects.
MODULE III – Fracture Mechanics
Details: Strain energy release rate, Stress intensity factor, Elastic stress field at and around crack tip, Airy stress function, Complex stress functions, Solution to crack problems, Effect of finite size, Plastic zone- Irwin and Dugdale models, Plane strain facture toughness, Plane stress fracture toughness, Alternative methods of fracture toughness testing, Design approach.
MODULE IV – Microstructural Aspects of Fracture Toughness
Details: Microstructural anisotropy and toughness, Alloy cleanliness, Structural modification for improved toughness, Embrittlement theories
MODULE V – Wear
Details: Classification of wear processes, Mechanisms of wear, Wear test methods, Worn surfaces, Types of particles present in wear debris, Wear resistance
Course Objectives
- Understanding behaviour of materials under various types of cyclic loading
- Understanding energy associated with fracture and stress field analysis of cracked surfaces
- Assessing tribological behaviour of surfaces
Course Outcomes
1. Understanding of the in-depth fatigue behaviour of metals <br />2. Generalization of the theories related to fracture of materials <br />3. Conceptualization of the analytical expressions of fracture mechanics <br />4. Solution to the analytical problems related to fatigue and fracture toughness <br />5. Understanding the metallurgical aspects of fracture toughness <br />6. Understand wear behaviour of metals/alloys
Essential Reading
- G. E. Dieter, Mechanical Metallurgy, McGrow-Hill
- R W Hertzberg, Deformation and Fracture Mechanics of Engineering Materials, John Wiley and Sons
Supplementary Reading
- David Broek, Elementary Engineering Fracture Mechanics, Sijthoff & Noordhoff
- Bharat Bhushan, Introduction to Tribology, Wiley