Course Details
Subject {L-T-P / C} : MM6212 : Mechanical Failures of Materials { 3-0-0 / 3}
Subject Nature : Theory
Coordinator : Prof. Krishna Dutta
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
Course Objectives
- To get an idea about different aspects of Fracture Mechanics.
- To analyze the mechanism of engineering failures
Course Outcomes
1. Students will be able to understand different aspects of Fracture Mechanics <br />2. Students will be able to understand different aspects of Fatigue <br />3. Students can analyze the mechanism of different engineering failures <br />4. Students can propose a suitable material for certain engineering applications <br />5. Students can understand the role of microstructure in fracture toughness control <br />6. Students can understand the role of environment in fracture
Essential Reading
- R.W. Hertzberg, Deformation and Fracture Mechanics of Engineering Materials, John Wiley & Sons Pub.
- Metal Hand Book, Failure Analysis & Prevention (Vol. - X), ASM Publication
Supplementary Reading
- G.E. Dieter, Mechanical Metallurgy, Mc-Graw Hill (1988)
- D. Broek, Elementary Fracture Mechanics, Martinus Nijho Publisher
Journal and Conferences
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