MTech Fatigue And Fracture Mechanics syllabus for 2 Sem 2020 scheme 20MAP241

Fracture Mechanics Principles:

Introduction, Mechanisms of Fracture, a crack in a structure, the Graffiti’s criterion, modem design, - strength, stiffness and toughness. Stress intensity approach.

Stress Analysis for Members with Cracks:

Linear elastic fracture mechanics, Crack tip stress and deformations; Relation between stress intensity factor and fracture toughness, Stress intensity based solutions. Crack tip plastic zone estimation, Plane stress and plane strain concepts. The Dugdale approach, the thickness effect.

Elastic - Plastic Fracture Mechanics:

Introduction, Elasto-plastic factor criteria, crack resistance curve, Iintegral, Crack opening displacement, crack tip opening displacement. Importance of R-curve in fracture mechanics, Experimental determination of I-integral, COD and CTOD.

Dynamic and Crack Arrest:

Introduction, the dynamic stress intensity and elastic energy release rate, crack branching, the principles of crack arrest, and the dynamic fracture toughness.

Fatigue and Fatigue Crack Growth Rate:

Fatigue loading, Various stages of crack propagation, the load spectrum, approximation of the stress spectrum, the crack growth integration, fatigue crack growth laws.

Fracture Resistance of Materials:

Fracture criteria, fatigue cracking criteria, effect of alloying and second phase particles, effect of processing and anisotropy, effect of temperature.

Computational Fracture Mechanics:

Overview of numerical methods, traditional methods in computational fracture mechanics – stress and displacement marching, elemental crack advance, virtual crack extension, the energy domain integral, finite element implementation. Limitations of numerical fracture analysis.

Fracture Toughness testing of metals:

Specimen size requirements, various test procedures, effects of temperature, loading rate and plate thickness on fracture toughness. Fracture testing in shear modes, fatigue testing, NDT methods.

Course outcomes:

At the end of the course the student will be able to:

1. Apply principles of fracture mechanics

2. Solve problems related to plastic fracture mechanics

3. Model Computational fracture mechanics

Question paper pattern:

The SEE question paper will be set for 100 marks and the marks scored will be proportionately reduced to 60.

• The question paper will have ten full questions carrying equal marks.
• Each full question is for 20 marks.
• There will be two full questions (with a maximum of four sub questions) from each module.
• Each full question will have sub question covering all the topics under a module.
• The students will have to answer five full questions, selecting one full question from each module.

Textbook/ Textbooks

1 Introduction to Fracture Mechanics Karen Helen McGraw Hill 2000.

2 Fracture of Engineering Brittle Materials Jayatilake Applied Science, London 2001

Reference Books

1 Fracture Mechanics Application T. L. Anderson CRC press 1998

2 Elementary Engineering Fracture of Mechanics David Broek, ArtinusNijhoff, London Springer 1999