15AE741 FATIGUE AND FRACTURE MECHANICS syllabus for AE



A d v e r t i s e m e n t

Module-1 Fatigue of Structures 10 hours

Fatigue of Structures:

S.N. curves, Endurance limit, Effect of mean stress, Goodman, Gerber and Soderberg relations and diagrams, Notches and stress concentrations, Neuber’s stress concentration factors, plastic stress concentration factors – Notched S-N curves

Module-2 Statistical Aspects Of Fatigue Behaviour 8 hours

Statistical Aspects Of Fatigue Behaviour:

Low cycle and high cycle fatigue, Coffin-Manson’s relation, Transition life, Cyclic Strain hardening and softening, Analysis of load histories, Cycle counting techniques, Cumulative damage, Miner’s theory, other theories.

Module-3 Physical Aspects Of Fatigue 6 hours

Physical Aspects Of Fatigue:

Phase in fatigue life, Crack initiation, Crack growth, Final fracture, Dislocations, Fatigue fracture surfaces.

Module-4 Fracture Mechanics 8 hours

Fracture Mechanics:

Strength of cracked bodies, potential energy and surface energy, Griffith’s theory, Irwin – Orwin extension of Griffith’s theory to ductile materials, Stress analysis of cracked bodies, Effect of thickness on fracture toughness, Stress intensity factors for typical geometries.

Module-5 Fatigue Design And Testing 8 hours

Fatigue Design And Testing:

Safe life and fail safe design philosophies, Importance of Fracture Mechanics in aerospace structure, Application to composite materials and structures.

 

Course outcomes:

After studying this course, students will be able to:

1. Evaluate the fatigue of structures.

2. Determine the strength of cracked bodies.

3. Distinguish the safe life and fail safe design.

 

Graduate Attributes :

  • Engineering Knowledge.
  • Problem Analysis.
  • Design / development of solutions
  • Interpretation of data.

 

Question paper pattern:

  • The question paper will have ten questions.
  • Each full question consists of 16 marks.
  • There will be 2 full questions (with a maximum of four sub questions) from each module.
  • Each full question will have sub questions covering all the topics under a module.
  • The students will have to answer 5 full questions, selecting one full question from each module.

 

Text Books:

1. D. Brock, “Elementary Engineering Fracture Mechanics”, Noordhoff International Publishing Co., London, 1994.

2. J.F.Knott, “Fundamentals of Fracture Mechanics”, Butterworth & Co., (Publishers) Ltd., London,1983.

 

Reference Books:

1. W. Barrois and L. Ripley, “Fatigue of Aircraft Structures”, Pergamon Press, Oxford, 1983.

2. C.G.Sih, “Mechanics of Fracture”, Vol.1 Sijthoff and Noordhoff International Publishing Co., Netherland, 1989.

Last Updated: Tuesday, January 24, 2023

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