ML3001 Fracture Mechanics and Failure Analysis Syllabus:
ML3001 Fracture Mechanics and Failure Analysis Syllabus – Anna University Regulation 2021
COURSE OBJECTIVES:
The main learning objective of this course is to prepare the students for
1. Acquiring knowledge on the basic concepts of fracture mechanics
2. Gaining knowledge on strain energy principle and use of it for developing theories
3. Understanding and analysing the fatigue failure
4. Getting 100amiliarized with the failure analysis on the components failing by creep, corrosion and wear failure
5. Acquiring knowledge on corrosion and wear failure of materials.
UNIT I BASIC CONCEPTS IN FRACTURE MECHANICS
Introduction to fracture- – elastic deformation, plastic and elasto-plastic deformation, Brittle fracture: Griffiths theory, Ductile fracture, Inglis solution-LEFM-EPFM- Different modes of fracture- photo elastic fringes- characteristics-crack emanating from inner and outer boundaries of cylinder
UNIT II MECHANICS OF FRACTURE- STATIC LOADING
Strain energy- strain energy in the presence of crack- energy release rate- fracture criteria- crack branching based on energy approach- Analytical solutions yielding near a crack front –westergaads stess function- plastic zone size – Dugdaale model – J integral and its relation to crack opening displacement. Strain energy release and stress intensity factor. Evaluation of fracture Toughness of different materials: size effect & control.
UNIT III FAILURE ANALYSIS OF FATIGUE FRACTURE
Fundamental sources of failures- Deficiency in design, Empirical Relation describing crack growth by fatigue – Life calculations for a given load amplitude – effects of changing the load spectrum – Effects of Environment. Micro-structural analysis of fatigue failures, some case studies in analysis of fatigue failures
UNIT IV FAILURE ANALYSIS OF CREEP RUPTURE
Fracture at elevated temperature: Time dependent mechanical behavior, stress rupture, Microstructural changes during creep, Mechanism of creep deformation and Creep deformation maps, Prediction of time to rupture, Creep-fatigue interaction. Some case studies in analysis of creep failures.
UNIT V FAILURE ANALYSIS OF CORROSION AND WEAR
Types of corrosion, Corrosion stress, corrosion cracking, Analysis of corrosion failure. Procedure for analysis of stress corrosion cracking. Effect of Environment. Analysis of corrosion characteristics of metals and alloys in different environment. Types of wear, Role of friction, Interaction of corrosion and wear. Analysis of wear failure.
TOTAL : 45 PERIODS
COURSE OUTCOMES:
Upon Completion of the course, the students will be able to
1. Design structure to prevent failure from the internal defect that unit within the structure
2. Derive the stress field solutions for fracture problems
3. Design structure to prevent fatigue and creep
4. Define different deformation and related theories
5. Analyse the corrosion and wear failure and system methods to prevent corrosion and wear
TEXT BOOKS
1. Hertz berg R W, “Deformation and fracture mechanics of Engineering materials” second edition John Wiley sons inc, New York 1983.
2. Knott. J.F, “Fundamentals of Fracture Mechanics” Butterworth London, 1973.
REFERENCES
1. Campbel J E, Underwood J H, and Gerberich W W., “Applications of Fracture Mechanics for the selection of Materials “, American Society for Metals, Metals Park Ohio, 1982.
2. Evalds H L and RJH Warnhil, ”Fracture Mechanics”, Edward Arnold Ltd, Baltimore,1984.
3. Fracture Mechanics Metals Handbook, ninth edition, vol. 8 437-491, American Society of Metals Metal Park ohio, 1985
4. Kare Hellan,“Introduction of Fracture Mechanics”, McGraw-Hill Book Company, 1985.
5. Prashant Kumar, “Elements of Fracture Mechanics”, Wheeler Publishing,1999.