Syllabus

Stress intensity factor, Stress analysis of cracks, Strain energy release rate, Derivation of relationship between strain energy release rate and stress intensity factor, Crack-tip plastic zone, Dugdale’s plastic strip model. Fracture mode transition: Plane stress versus plane strain, Crack opening displacement, Plane strain fracture toughness (KIC) testing, Fracture toughness determination with elastic plastic analysis (JIC), Concept of R-curve and fracture toughness measurement using it, Microstructural aspect of fracture toughness, Optimizing microstructure and alloy cleanliness to enhance fracture toughness. Fatigue stress life approach, Basquin’s equation, Fatigue strain life approach, Low cycle fatigue, Cofin-Manson’s equation, Fatigue total strain life relation, Fatigue life calculation using this approach, Neuber’s analysis for notched specimens. Fatigue crack growth rate, Paris law, Fatigue life calculation using this approach, Mechanism of fatigue crack nucleation and propagation, Factors affecting fatigue crack growth rate, Influence of load interaction, Short fatigue crack. Stress corrosion cracking and KISCC determination, Corrosion fatigue, Temper embrittlement, Hydrogen embrittlement, Liquid metal embrittlement, Neutron embrit-tlement. Fractographic analysis of ductile, brittle, fatigue and high temperature fractured surfaces. Failure Analysis: Steps involved in it. Case studies of some engineering failures

To introduce the concepts of ductile and brittle fracture mechanisms

To develop an understanding of fracture mechanics

To explore fatigue life and creep mechanisms

To examine environment-assisted cracking mechanisms in metals

1. Students will understand ductile and brittle fracture mechanisms and fractography
2. Students will develop knowledge of fracture mechanics
3. Students will learn fracture testing methods and prevention measures
4. Students will study fatigue life estimation, crack growth, and creep mechanisms
5. Students will examine environment-assisted cracking mechanisms in metals
6. Students can propose a suitable material for certain engineering applications

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

Metal Hand Book, Failure Analysis & Prevention (Vol. - X), ASM Publication

G.E. Dieter, Mechanical Metallurgy, Mc-Graw Hill (1988)

D. Broek, Elementary Fracture Mechanics, Martinus Nijho Publisher