AE6007 - FATIGUE AND FRACTURE (Syllabus) 2013-regulation Anna University

AE6007 - FATIGUE AND FRACTURE (Syllabus) 2013-regulation Anna University

AE6007

FATIGUE AND FRACTURE

 LPTC
3003

OBJECTIVES:
• To understand the basic concepts involved in fatigue analysis and to study the importance of fracture mechanics in aerospace applications.

UNIT I

FATIGUE OF STRUCTURES

7
S.N. curves - Endurance limits - 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 – Fatigue of composite materials.

UNIT II

STATISTICAL ASPECTS OF FATIGUE BEHAVIOUR

10
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.


UNIT III

PHYSICAL ASPECTS OF FATIGUE

10
Phase in fatigue life - Crack initiation - Crack growth - Final Fracture - Dislocations - fatigue fracture surfaces.

UNIT IV

FRACTURE MECHANICS

10
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.

UNIT V

FATIGUE DESIGN AND TESTING

8
Safe life and Fail-safe design philosophies - Importance of Fracture Mechanics in aerospace structures - Application to composite materials and structures.

TOTAL : 45 PERIODS

OUTCOMES:
• Ability to apply mathematical knowledge to define fatigue behaviors
• Ability to perform fatigue design
• Ability to analyse the fracture due to fatigue

TEXT BOOKS:
1. Prasanth Kumar, "Elements of fracture mechanics", Wheeter publication, 1999.
2. Barrois W, Ripely, E.L., “Fatigue of aircraft structure," Pergamon press. Oxford, 1983.

REFERENCES
1. Sih C.G., “Mechanics of fracture.” Vol - I, Sijthoff and w Noordhoff International Publishing Co., Netherlands, 1989.
2. Knott, J.F., “Fundamentals of Fracture Mechanics,” - Buterworth & Co., Ltd., London, 1983.
3. Kare Hellan ,’Introduction to Fracture Mechanics’, McGraw Hill, Singapore,1985
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