This book provides a concise discussion of fatigue crack growth (FCG) failure and lifing analysis methods for metallic aircraft structures and components. After a reasonably concise historical review, surveys are made of (i) the importance of fatigue for aircraft structural failures and the sources of fatigue nucleation and cracking, (ii) contemporary FCG lifing methods, and (iii) the Quantitative Fractography (QF) required for determining the actual FCG behaviour. These surveys are followed by the main part of the book, which is a discussion, using case histories, of the applicabilities of Linear Elastic Fracture Mechanics (LEFM) and non-LEFM methods for analysing service fatigue failures and full- and sub-scale test results. This discussion is derived primarily from the experiences of the Defence Science and Technology Group in Melbourne, Australia, and the Netherlands Aerospace Centre, Marknesse, the Netherlands.
This book provides a concise discussion of fatigue crack growth (FCG) failure and lifing analysis methods for metallic aircraft structures and components. After a reasonably concise historical review, surveys are made of (i) the importance of fatigue for aircraft structural failures and the sources of fatigue nucleation and cracking, (ii) contemporary FCG lifing methods, and (iii) the Quantitative Fractography (QF) required for determining the actual FCG behaviour. These surveys are followed by the main part of the book, which is a discussion, using case histories, of the applicabilities of Linear Elastic Fracture Mechanics (LEFM) and non-LEFM methods for analysing service fatigue failures and full- and sub-scale test results. This discussion is derived primarily from the experiences of the Defence Science and Technology Group in Melbourne, Australia, and the Netherlands Aerospace Centre, Marknesse, the Netherlands.
The coupling between mechanical deformation and thermal energy in an elastic material, known as the thermoelastic effect, was first documented by Gough in 1805, who observed that the material experienced a change in temperature during elongation. More recently, investigation of the phenomenon of energy exchange in metals has been extended into the plastic regime, where a material experiences heating after the elastic limit has been exceeded, i.e. the thermoplastic effect. It is proposed to measure the local temperature, strain and cross-sectional area of various specimens undergoing adiabatic elastoplastic deformation, and to deduce the local stress. These parameters are necessary if the relationship between the measured temperature and the dissipated and available energies is to be determined. Of the available devices for minute temperature measurements, namely thermistors and infra-red detectors, the latter were chosen for this work. Australia. (JES).
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