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AE2030 FATIGUE AND FRACTURE class notes and last year question paper


AE2030 FATIGUE AND FRACTURE
OBJECTIVE
To study the concepts of estimation of the endurance and failure mechanism of
components

UNIT I FATIGUE OF STRUCTURES 8
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.

UNIT II STATISTICAL ASPECTS OF FATIGUE BEHAVIOUR 9
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 AND FRACTURE 12
Phase in fatigue life - Crack initiation - Crack growth - Final Fracture - Dislocations -
fatigue fracture surfaces - Strength and stress analysis of cracked bodies - Potential
energy and surface energy - Griffith's theory - Irwin - Orwin extension of Griffith's theory
to ductile materials - Effect of thickness on fracture toughness - stress intensity factors for typical geometries.

UNIT IV FATIGUE DESIGN ANDTESTINIG 8
Safe life and Fail-safe design philosophies - Importance of Fracture Mechanics in
aerospace structures - Application to composite materials and structures.
UNIT V FUNDAMENTALS OF FAILURE ANALYSIS 8
Common causes of failure. Principles of failure analysis. Fracture mechanics approach to
failure problems. Techniques of failure analysis. Service failure mechanisms - ductile and
brittle fracture, fatigue fracture, wear failures, fretting failures, environment induced
failures, high temp. failure. Faulty heat treatment and design failures, processing failures
(forging, casting, machining etc.),
TOTAL: 45 PERIODS


TEXT BOOKS
1. Prasanth Kumar - "Elements of fracture mechanics" - Wheeter publication, 1999.
2. Barrois W, Ripely, E.L., "Fatigue of aircraft structure", Pe/gamon press. Oxford, 1983.



 
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